treewide: s_targetPlatform_hostPlatform_ in non-compiler packages

stdenv.targetPlatform really shouldn't be used by software that
doesn't generate or manipulate binaries.  I reviewed all uses of
targetPlatform outside of pkgs/development/compilers and pkgs/stdenv
and replaced those which weren't involved in something which fits
these criteria.

69 files changed, 94 insertions, 96 deletions

diff --git a/pkgs/applications/audio/aucatctl/default.nix b/pkgs/applications/audio/aucatctl/default.nix
index cf53a20700a..d3f814a7db8 100644
--- a/pkgs/applications/audio/aucatctl/default.nix
+++ b/pkgs/applications/audio/aucatctl/default.nix
@@ -10,7 +10,7 @@ stdenv.mkDerivation (finalAttrs: {
   };
 
   buildInputs = [ sndio ]
-    ++ lib.optional (!stdenv.isDarwin && !stdenv.targetPlatform.isBSD)
+    ++ lib.optional (!stdenv.isDarwin && !stdenv.hostPlatform.isBSD)
     libbsd;
 
   outputs = [ "out" "man" ];
@@ -18,7 +18,7 @@ stdenv.mkDerivation (finalAttrs: {
   preBuild = ''
     makeFlagsArray+=("PREFIX=$out")
   '' + lib.optionalString
-    (!stdenv.isDarwin && !stdenv.targetPlatform.isBSD) ''
+    (!stdenv.isDarwin && !stdenv.hostPlatform.isBSD) ''
       makeFlagsArray+=(LDADD="-lsndio -lbsd")
 
       # Fix warning about implicit declaration of function 'strlcpy'
diff --git a/pkgs/applications/audio/audacity/default.nix b/pkgs/applications/audio/audacity/default.nix
index 16bc4fe7889..05094d655b9 100644
--- a/pkgs/applications/audio/audacity/default.nix
+++ b/pkgs/applications/audio/audacity/default.nix
@@ -78,7 +78,7 @@ stdenv.mkDerivation rec {
   '' + lib.optionalString stdenv.isLinux ''
     substituteInPlace libraries/lib-files/FileNames.cpp \
       --replace /usr/include/linux/magic.h ${linuxHeaders}/include/linux/magic.h
-  '' + lib.optionalString (stdenv.isDarwin && lib.versionOlder stdenv.targetPlatform.darwinMinVersion "11.0") ''
+  '' + lib.optionalString (stdenv.isDarwin && lib.versionOlder stdenv.hostPlatform.darwinMinVersion "11.0") ''
     sed -z -i "s/NSAppearanceName.*systemAppearance//" src/AudacityApp.mm
   '';
 
diff --git a/pkgs/applications/backup/proxmox-backup-client/default.nix b/pkgs/applications/backup/proxmox-backup-client/default.nix
index 49ad9cccc9c..8e6da71a1ea 100644
--- a/pkgs/applications/backup/proxmox-backup-client/default.nix
+++ b/pkgs/applications/backup/proxmox-backup-client/default.nix
@@ -88,7 +88,7 @@ rustPlatform.buildRustPackage {
   postBuild = ''
     make -C docs \
       DEB_VERSION=${version} DEB_VERSION_UPSTREAM=${version} \
-      RUSTC_TARGET=${stdenv.targetPlatform.config} \
+      RUSTC_TARGET=${stdenv.hostPlatform.config} \
       BUILD_MODE=release \
       proxmox-backup-client.1 pxar.1
   '';
diff --git a/pkgs/applications/editors/emacs/elisp-packages/elpa-devel-packages.nix b/pkgs/applications/editors/emacs/elisp-packages/elpa-devel-packages.nix
index 82f1c6bfaaa..ff5cce83103 100644
--- a/pkgs/applications/editors/emacs/elisp-packages/elpa-devel-packages.nix
+++ b/pkgs/applications/editors/emacs/elisp-packages/elpa-devel-packages.nix
@@ -65,7 +65,7 @@ self: let
       });
 
       xeft = super.xeft.overrideAttrs (old: let
-        libExt = pkgs.stdenv.targetPlatform.extensions.sharedLibrary;
+        libExt = pkgs.stdenv.hostPlatform.extensions.sharedLibrary;
       in {
         dontUnpack = false;
 
diff --git a/pkgs/applications/editors/emacs/elisp-packages/elpa-packages.nix b/pkgs/applications/editors/emacs/elisp-packages/elpa-packages.nix
index 2808ec7fcc0..84c991ad17c 100644
--- a/pkgs/applications/editors/emacs/elisp-packages/elpa-packages.nix
+++ b/pkgs/applications/editors/emacs/elisp-packages/elpa-packages.nix
@@ -118,7 +118,7 @@ self: let
       });
 
       jinx = super.jinx.overrideAttrs (old: let
-        libExt = pkgs.stdenv.targetPlatform.extensions.sharedLibrary;
+        libExt = pkgs.stdenv.hostPlatform.extensions.sharedLibrary;
       in {
         dontUnpack = false;
 
@@ -159,7 +159,7 @@ self: let
       );
 
       xeft = super.xeft.overrideAttrs (old: let
-        libExt = pkgs.stdenv.targetPlatform.extensions.sharedLibrary;
+        libExt = pkgs.stdenv.hostPlatform.extensions.sharedLibrary;
       in {
         dontUnpack = false;
 
diff --git a/pkgs/applications/editors/emacs/elisp-packages/melpa-packages.nix b/pkgs/applications/editors/emacs/elisp-packages/melpa-packages.nix
index c2754d7fc30..cd45cfc7872 100644
--- a/pkgs/applications/editors/emacs/elisp-packages/melpa-packages.nix
+++ b/pkgs/applications/editors/emacs/elisp-packages/melpa-packages.nix
@@ -315,7 +315,7 @@ let
         ivy-rtags = fix-rtags super.ivy-rtags;
 
         jinx = super.jinx.overrideAttrs (old: let
-          libExt = pkgs.stdenv.targetPlatform.extensions.sharedLibrary;
+          libExt = pkgs.stdenv.hostPlatform.extensions.sharedLibrary;
         in {
           nativeBuildInputs = (old.nativeBuildInputs or [ ]) ++ [
             pkgs.pkg-config
diff --git a/pkgs/applications/misc/synergy/default.nix b/pkgs/applications/misc/synergy/default.nix
index 17692a22b7b..2fe734fde00 100644
--- a/pkgs/applications/misc/synergy/default.nix
+++ b/pkgs/applications/misc/synergy/default.nix
@@ -104,7 +104,7 @@ stdenv.mkDerivation rec {
 
   cmakeFlags = lib.optional (!withGUI) "-DSYNERGY_BUILD_LEGACY_GUI=OFF"
     # NSFilenamesPboardType is deprecated in 10.14+
-    ++ lib.optional stdenv.isDarwin "-DCMAKE_OSX_DEPLOYMENT_TARGET=${if stdenv.isAarch64 then "10.13" else stdenv.targetPlatform.darwinSdkVersion}";
+    ++ lib.optional stdenv.isDarwin "-DCMAKE_OSX_DEPLOYMENT_TARGET=${if stdenv.isAarch64 then "10.13" else stdenv.hostPlatform.darwinSdkVersion}";
 
   doCheck = true;
 
diff --git a/pkgs/applications/networking/mullvad/mullvad.nix b/pkgs/applications/networking/mullvad/mullvad.nix
index 71a53aa3344..0904fd5c758 100644
--- a/pkgs/applications/networking/mullvad/mullvad.nix
+++ b/pkgs/applications/networking/mullvad/mullvad.nix
@@ -51,7 +51,7 @@ rustPlatform.buildRustPackage rec {
 
   # talpid-core wants libwg.a in build/lib/{triple}
   preBuild = ''
-    dest=build/lib/${stdenv.targetPlatform.config}
+    dest=build/lib/${stdenv.hostPlatform.config}
     mkdir -p $dest
     ln -s ${libwg}/lib/libwg.a $dest
   '';
diff --git a/pkgs/applications/radio/uhd/default.nix b/pkgs/applications/radio/uhd/default.nix
index 6a196cdea35..bad5b2d1d98 100644
--- a/pkgs/applications/radio/uhd/default.nix
+++ b/pkgs/applications/radio/uhd/default.nix
@@ -141,7 +141,7 @@ stdenv.mkDerivation (finalAttrs: {
   ];
 
   postPhases = [ "installFirmware" "removeInstalledTests" ]
-    ++ optionals (enableUtils && stdenv.targetPlatform.isLinux) [ "moveUdevRules" ]
+    ++ optionals (enableUtils && stdenv.hostPlatform.isLinux) [ "moveUdevRules" ]
   ;
 
   # UHD expects images in `$CMAKE_INSTALL_PREFIX/share/uhd/images`
diff --git a/pkgs/applications/science/biology/flywheel-cli/default.nix b/pkgs/applications/science/biology/flywheel-cli/default.nix
index 7d74b51f606..254a3c011d2 100644
--- a/pkgs/applications/science/biology/flywheel-cli/default.nix
+++ b/pkgs/applications/science/biology/flywheel-cli/default.nix
@@ -5,7 +5,7 @@
 }:
 
 let
-  inherit (stdenv.targetPlatform) system;
+  inherit (stdenv.hostPlatform) system;
   throwSystem = throw "Unsupported system: ${system}";
 
   os = {
diff --git a/pkgs/applications/video/davinci-resolve/default.nix b/pkgs/applications/video/davinci-resolve/default.nix
index 2c168912253..99694efda1d 100644
--- a/pkgs/applications/video/davinci-resolve/default.nix
+++ b/pkgs/applications/video/davinci-resolve/default.nix
@@ -62,7 +62,7 @@ let
           SITEURL = "https://www.blackmagicdesign.com/api/register/us/download/${DOWNLOADID}";
 
           USERAGENT = builtins.concatStringsSep " " [
-            "User-Agent: Mozilla/5.0 (X11; Linux ${stdenv.targetPlatform.linuxArch})"
+            "User-Agent: Mozilla/5.0 (X11; Linux ${stdenv.hostPlatform.linuxArch})"
             "AppleWebKit/537.36 (KHTML, like Gecko)"
             "Chrome/77.0.3865.75"
             "Safari/537.36"
diff --git a/pkgs/applications/virtualization/rust-hypervisor-firmware/default.nix b/pkgs/applications/virtualization/rust-hypervisor-firmware/default.nix
index ddb06a97f16..67ea1e07b90 100644
--- a/pkgs/applications/virtualization/rust-hypervisor-firmware/default.nix
+++ b/pkgs/applications/virtualization/rust-hypervisor-firmware/default.nix
@@ -1,14 +1,13 @@
 { lib
 , fetchFromGitHub
 , hostPlatform
-, targetPlatform
 , cargo
 , rustc
 , lld
 }:
 
 let
-  arch = targetPlatform.qemuArch;
+  arch = hostPlatform.qemuArch;
 
   target = ./. + "/${arch}-unknown-none.json";
 
diff --git a/pkgs/by-name/bm/bmake/package.nix b/pkgs/by-name/bm/bmake/package.nix
index 2626c45f021..1272e1d0173 100644
--- a/pkgs/by-name/bm/bmake/package.nix
+++ b/pkgs/by-name/bm/bmake/package.nix
@@ -111,7 +111,7 @@ stdenv.mkDerivation (finalAttrs: {
     maintainers = with lib.maintainers; [ thoughtpolice AndersonTorres ];
     platforms = lib.platforms.unix;
     # ofborg: x86_64-linux builds the musl package, aarch64-linux doesn't
-    broken = stdenv.targetPlatform.isMusl && stdenv.buildPlatform.isAarch64;
+    broken = stdenv.hostPlatform.isMusl && stdenv.buildPlatform.isAarch64;
   };
 })
 # TODO: report the quirks and patches to bmake devteam (especially the Musl one)
diff --git a/pkgs/by-name/me/mermaid-cli/package.nix b/pkgs/by-name/me/mermaid-cli/package.nix
index a42fe9754ff..a45930287a5 100644
--- a/pkgs/by-name/me/mermaid-cli/package.nix
+++ b/pkgs/by-name/me/mermaid-cli/package.nix
@@ -61,7 +61,7 @@ stdenv.mkDerivation rec {
     cp -r . "$out/lib/node_modules/@mermaid-js/mermaid-cli"
 
     makeWrapper "${nodejs}/bin/node" "$out/bin/mmdc" \
-  '' + lib.optionalString (lib.meta.availableOn stdenv.targetPlatform chromium) ''
+  '' + lib.optionalString (lib.meta.availableOn stdenv.hostPlatform chromium) ''
       --set PUPPETEER_EXECUTABLE_PATH '${lib.getExe chromium}' \
   '' + ''
       --add-flags "$out/lib/node_modules/@mermaid-js/mermaid-cli/src/cli.js"
diff --git a/pkgs/desktops/deepin/go-package/deepin-desktop-schemas/default.nix b/pkgs/desktops/deepin/go-package/deepin-desktop-schemas/default.nix
index 274c81bfce9..4fb99cfb80a 100644
--- a/pkgs/desktops/deepin/go-package/deepin-desktop-schemas/default.nix
+++ b/pkgs/desktops/deepin/go-package/deepin-desktop-schemas/default.nix
@@ -33,7 +33,7 @@ buildGoPackage rec {
   buildPhase = ''
     runHook preBuild
     addToSearchPath GOPATH "${go-lib}/share/gocode"
-    make ARCH=${stdenv.targetPlatform.linuxArch} -C go/src/${goPackagePath}
+    make ARCH=${stdenv.hostPlatform.linuxArch} -C go/src/${goPackagePath}
     runHook postBuild
   '';
 
diff --git a/pkgs/development/interpreters/acl2/libipasirglucose4/default.nix b/pkgs/development/interpreters/acl2/libipasirglucose4/default.nix
index c31e0dbe67f..e59d2ed7c17 100644
--- a/pkgs/development/interpreters/acl2/libipasirglucose4/default.nix
+++ b/pkgs/development/interpreters/acl2/libipasirglucose4/default.nix
@@ -7,7 +7,7 @@ stdenv.mkDerivation rec {
   # that as the version number, I guess.
   version = "2017";
 
-  libname = pname + stdenv.targetPlatform.extensions.sharedLibrary;
+  libname = pname + stdenv.hostPlatform.extensions.sharedLibrary;
 
   src = fetchurl {
     url = "https://baldur.iti.kit.edu/sat-competition-2017/solvers/incremental/glucose-ipasir.zip";
diff --git a/pkgs/development/interpreters/tinyscheme/default.nix b/pkgs/development/interpreters/tinyscheme/default.nix
index 1b298af4ac4..fef3f5dacee 100644
--- a/pkgs/development/interpreters/tinyscheme/default.nix
+++ b/pkgs/development/interpreters/tinyscheme/default.nix
@@ -29,7 +29,7 @@ stdenv.mkDerivation rec {
     # We want to have the makefile pick up $CC, etc. so that we don't have
     # to unnecessarily tie this package to the GCC stdenv.
     ./02-use-toolchain-env-vars.patch
-  ] ++ lib.optionals stdenv.targetPlatform.isDarwin [
+  ] ++ lib.optionals stdenv.hostPlatform.isDarwin [
     # On macOS the library suffix is .dylib:
     ./03-macOS-SOsuf.patch
   ];
diff --git a/pkgs/development/libraries/SDL2/default.nix b/pkgs/development/libraries/SDL2/default.nix
index 2c05252c847..dea308d59a2 100644
--- a/pkgs/development/libraries/SDL2/default.nix
+++ b/pkgs/development/libraries/SDL2/default.nix
@@ -9,7 +9,7 @@
 , libGL
 , alsaSupport ? stdenv.isLinux && !stdenv.hostPlatform.isAndroid
 , alsa-lib
-, x11Support ? !stdenv.targetPlatform.isWindows && !stdenv.hostPlatform.isAndroid
+, x11Support ? !stdenv.hostPlatform.isWindows && !stdenv.hostPlatform.isAndroid
 , libX11
 , xorgproto
 , libICE
@@ -122,7 +122,7 @@ stdenv.mkDerivation (finalAttrs: {
     "--disable-oss"
   ] ++ lib.optional (!x11Support) "--without-x"
   ++ lib.optional alsaSupport "--with-alsa-prefix=${alsa-lib.out}/lib"
-  ++ lib.optional stdenv.targetPlatform.isWindows "--disable-video-opengles"
+  ++ lib.optional stdenv.hostPlatform.isWindows "--disable-video-opengles"
   ++ lib.optional stdenv.isDarwin "--disable-sdltest";
 
   # We remove libtool .la files when static libs are requested,
diff --git a/pkgs/development/libraries/audio/zita-resampler/default.nix b/pkgs/development/libraries/audio/zita-resampler/default.nix
index 075ce33ef9e..70054134767 100644
--- a/pkgs/development/libraries/audio/zita-resampler/default.nix
+++ b/pkgs/development/libraries/audio/zita-resampler/default.nix
@@ -18,7 +18,7 @@ stdenv.mkDerivation rec {
     cd source
     substituteInPlace Makefile \
       --replace 'ldconfig' ""
-  '' + lib.optionalString (!stdenv.targetPlatform.isx86_64) ''
+  '' + lib.optionalString (!stdenv.hostPlatform.isx86_64) ''
     substituteInPlace Makefile \
       --replace '-DENABLE_SSE2' ""
   '';
diff --git a/pkgs/development/libraries/blst/default.nix b/pkgs/development/libraries/blst/default.nix
index ef174d1118a..48865cf8356 100644
--- a/pkgs/development/libraries/blst/default.nix
+++ b/pkgs/development/libraries/blst/default.nix
@@ -14,8 +14,8 @@ stdenv.mkDerivation ( finalAttrs: {
   buildPhase = ''
     runHook preBuild
 
-    ./build.sh ${lib.optionalString stdenv.targetPlatform.isWindows "flavour=mingw64"}
-    ./build.sh -shared ${lib.optionalString stdenv.targetPlatform.isWindows "flavour=mingw64"}
+    ./build.sh ${lib.optionalString stdenv.hostPlatform.isWindows "flavour=mingw64"}
+    ./build.sh -shared ${lib.optionalString stdenv.hostPlatform.isWindows "flavour=mingw64"}
 
     runHook postBuild
   '';
diff --git a/pkgs/development/libraries/cctz/default.nix b/pkgs/development/libraries/cctz/default.nix
index f1c1a272b5f..0b945c8c599 100644
--- a/pkgs/development/libraries/cctz/default.nix
+++ b/pkgs/development/libraries/cctz/default.nix
@@ -16,8 +16,8 @@ stdenv.mkDerivation rec {
   buildInputs = lib.optional stdenv.isDarwin Foundation;
 
   installTargets = [ "install_hdrs" ]
-    ++ lib.optional (!stdenv.targetPlatform.isStatic) "install_shared_lib"
-    ++ lib.optional stdenv.targetPlatform.isStatic "install_lib";
+    ++ lib.optional (!stdenv.hostPlatform.isStatic) "install_shared_lib"
+    ++ lib.optional stdenv.hostPlatform.isStatic "install_lib";
 
   postInstall = lib.optionalString stdenv.isDarwin ''
     install_name_tool -id $out/lib/libcctz.so $out/lib/libcctz.so
diff --git a/pkgs/development/libraries/ffmpeg/generic.nix b/pkgs/development/libraries/ffmpeg/generic.nix
index 57235b24308..e713ca1413f 100644
--- a/pkgs/development/libraries/ffmpeg/generic.nix
+++ b/pkgs/development/libraries/ffmpeg/generic.nix
@@ -52,7 +52,7 @@
 , withLadspa ? withFullDeps # LADSPA audio filtering
 , withLibplacebo ? withFullDeps && !stdenv.isDarwin # libplacebo video processing library
 , withLzma ? withHeadlessDeps # xz-utils
-, withMfx ? withFullDeps && (with stdenv.targetPlatform; isLinux && !isAarch) # Hardware acceleration via intel-media-sdk/libmfx
+, withMfx ? withFullDeps && (with stdenv.hostPlatform; isLinux && !isAarch) # Hardware acceleration via intel-media-sdk/libmfx
 , withModplug ? withFullDeps && !stdenv.isDarwin # ModPlug support
 , withMp3lame ? withHeadlessDeps # LAME MP3 encoder
 , withMysofa ? withFullDeps # HRTF support via SOFAlizer
@@ -386,8 +386,8 @@ stdenv.mkDerivation (finalAttrs: {
     (enableFeature withHardcodedTables "hardcoded-tables")
     (enableFeature withSafeBitstreamReader "safe-bitstream-reader")
 
-    (enableFeature (withMultithread && stdenv.targetPlatform.isUnix) "pthreads")
-    (enableFeature (withMultithread && stdenv.targetPlatform.isWindows) "w32threads")
+    (enableFeature (withMultithread && stdenv.hostPlatform.isUnix) "pthreads")
+    (enableFeature (withMultithread && stdenv.hostPlatform.isWindows) "w32threads")
     "--disable-os2threads" # We don't support OS/2
 
     (enableFeature withNetwork "network")
diff --git a/pkgs/development/libraries/libcef/default.nix b/pkgs/development/libraries/libcef/default.nix
index 5daca729bc7..2fb83097c02 100644
--- a/pkgs/development/libraries/libcef/default.nix
+++ b/pkgs/development/libraries/libcef/default.nix
@@ -69,7 +69,7 @@ let
   platforms."aarch64-linux".sha256 = "12sp58nxa3nv800badv62vpvc30hyb0ykywdaxgv9y8pswp9lq0z";
   platforms."x86_64-linux".sha256 = "0vzzwq1k6bv9d209yg3samvfnfwj7s58y9r3p3pd98wxa9iyzf4j";
 
-  platformInfo = builtins.getAttr stdenv.targetPlatform.system platforms;
+  platformInfo = builtins.getAttr stdenv.hostPlatform.system platforms;
 in
 stdenv.mkDerivation rec {
   pname = "cef-binary";
diff --git a/pkgs/development/libraries/libsodium/default.nix b/pkgs/development/libraries/libsodium/default.nix
index b4eeed32d59..b3a00d89a5d 100644
--- a/pkgs/development/libraries/libsodium/default.nix
+++ b/pkgs/development/libraries/libsodium/default.nix
@@ -13,18 +13,18 @@ stdenv.mkDerivation (finalAttrs: {
 
   outputs = [ "out" "dev" ];
 
-  patches = lib.optional stdenv.targetPlatform.isMinGW ./mingw-no-fortify.patch;
+  patches = lib.optional stdenv.hostPlatform.isMinGW ./mingw-no-fortify.patch;
 
-  nativeBuildInputs = lib.optional stdenv.targetPlatform.isMinGW autoreconfHook;
+  nativeBuildInputs = lib.optional stdenv.hostPlatform.isMinGW autoreconfHook;
 
   separateDebugInfo = stdenv.isLinux && stdenv.hostPlatform.libc != "musl";
 
   enableParallelBuilding = true;
-  hardeningDisable = lib.optional (stdenv.targetPlatform.isMusl && stdenv.targetPlatform.isx86_32) "stackprotector";
+  hardeningDisable = lib.optional (stdenv.hostPlatform.isMusl && stdenv.hostPlatform.isx86_32) "stackprotector";
 
   # FIXME: the hardeingDisable attr above does not seems effective, so
   # the need to disable stackprotector via configureFlags
-  configureFlags = lib.optional (stdenv.targetPlatform.isMusl && stdenv.targetPlatform.isx86_32) "--disable-ssp";
+  configureFlags = lib.optional (stdenv.hostPlatform.isMusl && stdenv.hostPlatform.isx86_32) "--disable-ssp";
 
   doCheck = true;
 
diff --git a/pkgs/development/libraries/libusb1/default.nix b/pkgs/development/libraries/libusb1/default.nix
index 326ee302815..1f768a2cb26 100644
--- a/pkgs/development/libraries/libusb1/default.nix
+++ b/pkgs/development/libraries/libusb1/default.nix
@@ -4,7 +4,7 @@
 , fetchpatch
 , autoreconfHook
 , pkg-config
-, enableUdev ? stdenv.isLinux && !stdenv.targetPlatform.isStatic
+, enableUdev ? stdenv.isLinux && !stdenv.hostPlatform.isStatic
 , udev
 , libobjc
 , IOKit
diff --git a/pkgs/development/libraries/mtxclient/default.nix b/pkgs/development/libraries/mtxclient/default.nix
index dcba45f41c3..13816faefce 100644
--- a/pkgs/development/libraries/mtxclient/default.nix
+++ b/pkgs/development/libraries/mtxclient/default.nix
@@ -61,6 +61,6 @@ stdenv.mkDerivation rec {
     platforms = platforms.all;
     # Should be fixable if a higher clang version is used, see:
     # https://github.com/NixOS/nixpkgs/pull/85922#issuecomment-619287177
-    broken = stdenv.targetPlatform.isDarwin;
+    broken = stdenv.hostPlatform.isDarwin;
   };
 }
diff --git a/pkgs/development/libraries/multipart-parser-c/default.nix b/pkgs/development/libraries/multipart-parser-c/default.nix
index 45b0abdee71..89665f2efc9 100644
--- a/pkgs/development/libraries/multipart-parser-c/default.nix
+++ b/pkgs/development/libraries/multipart-parser-c/default.nix
@@ -19,7 +19,7 @@ stdenv.mkDerivation rec {
 
   installPhase = ''
     mkdir -p $out/lib
-    mv lib*${stdenv.targetPlatform.extensions.sharedLibrary} $out/lib/
+    mv lib*${stdenv.hostPlatform.extensions.sharedLibrary} $out/lib/
 
     mkdir -p $out/include
     mv *.h $out/include/
diff --git a/pkgs/development/libraries/ntl/default.nix b/pkgs/development/libraries/ntl/default.nix
index 9335bec35ce..8fa37141628 100644
--- a/pkgs/development/libraries/ntl/default.nix
+++ b/pkgs/development/libraries/ntl/default.nix
@@ -48,7 +48,7 @@ stdenv.mkDerivation rec {
     "TUNE=${
       if tune then
         "auto"
-      else if stdenv.targetPlatform.isx86 then
+      else if stdenv.hostPlatform.isx86 then
         "x86" # "chooses options that should be well suited for most x86 platforms"
       else
         "generic" # "chooses options that should be OK for most platforms"
diff --git a/pkgs/development/libraries/protobuf/generic.nix b/pkgs/development/libraries/protobuf/generic.nix
index bcef33b0caf..cf00d1d50be 100644
--- a/pkgs/development/libraries/protobuf/generic.nix
+++ b/pkgs/development/libraries/protobuf/generic.nix
@@ -76,7 +76,7 @@ stdenv.mkDerivation (finalAttrs: {
   ]
   # Tests fail to build on 32-bit platforms; fixed in 22.x
   # https://github.com/protocolbuffers/protobuf/issues/10418
-  ++ lib.optionals (stdenv.targetPlatform.is32bit && lib.versionOlder version "22") [
+  ++ lib.optionals (stdenv.hostPlatform.is32bit && lib.versionOlder version "22") [
     "-Dprotobuf_BUILD_TESTS=OFF"
   ];
 
@@ -85,7 +85,7 @@ stdenv.mkDerivation (finalAttrs: {
   # https://hydra.nixos.org/build/235677717/nixlog/4/tail
   # Also AnyTest.TestPackFromSerializationExceedsSizeLimit fails on 32-bit platforms
   # https://github.com/protocolbuffers/protobuf/issues/8460
-  doCheck = !(stdenv.isDarwin && lib.versionAtLeast version "23") && !stdenv.targetPlatform.is32bit;
+  doCheck = !(stdenv.isDarwin && lib.versionAtLeast version "23") && !stdenv.hostPlatform.is32bit;
 
   passthru = {
     tests = {
diff --git a/pkgs/development/libraries/relibc/default.nix b/pkgs/development/libraries/relibc/default.nix
index 3bc476ccc0f..437da86e8c2 100644
--- a/pkgs/development/libraries/relibc/default.nix
+++ b/pkgs/development/libraries/relibc/default.nix
@@ -63,8 +63,7 @@ redoxRustPlatform.buildRustPackage rec {
     DESTDIR=$out make install
   '';
 
-  # TODO: should be hostPlatform
-  TARGET = stdenvNoCC.targetPlatform.rust.rustcTargetSpec;
+  TARGET = stdenvNoCC.hostPlatform.rust.rustcTargetSpec;
 
   cargoLock = {
     lockFile = ./Cargo.lock;
diff --git a/pkgs/development/libraries/science/math/libtorch/bin.nix b/pkgs/development/libraries/science/math/libtorch/bin.nix
index a47d8260714..47a6249ebdc 100644
--- a/pkgs/development/libraries/science/math/libtorch/bin.nix
+++ b/pkgs/development/libraries/science/math/libtorch/bin.nix
@@ -26,7 +26,7 @@ in stdenv.mkDerivation {
   inherit version;
   pname = "libtorch";
 
-  src = fetchzip srcs."${stdenv.targetPlatform.system}-${device}" or unavailable;
+  src = fetchzip srcs."${stdenv.hostPlatform.system}-${device}" or unavailable;
 
   nativeBuildInputs =
     if stdenv.isDarwin then [ fixDarwinDylibNames ]
diff --git a/pkgs/development/libraries/science/math/zn_poly/default.nix b/pkgs/development/libraries/science/math/zn_poly/default.nix
index 13344db9ebc..bdaf6e6284e 100644
--- a/pkgs/development/libraries/science/math/zn_poly/default.nix
+++ b/pkgs/development/libraries/science/math/zn_poly/default.nix
@@ -31,7 +31,7 @@ stdenv.mkDerivation rec {
 
   # name of library file ("libzn_poly.so")
   libbasename = "libzn_poly";
-  libext = stdenv.targetPlatform.extensions.sharedLibrary;
+  libext = stdenv.hostPlatform.extensions.sharedLibrary;
 
   makeFlags = [ "CC=${stdenv.cc.targetPrefix}cc" ];
 
diff --git a/pkgs/development/libraries/startup-notification/default.nix b/pkgs/development/libraries/startup-notification/default.nix
index c1c5819ad42..bf84345be2d 100644
--- a/pkgs/development/libraries/startup-notification/default.nix
+++ b/pkgs/development/libraries/startup-notification/default.nix
@@ -8,7 +8,7 @@ stdenv.mkDerivation rec {
     sha256 = "3c391f7e930c583095045cd2d10eb73a64f085c7fde9d260f2652c7cb3cfbe4a";
   };
 
-  configureFlags = lib.optionals (stdenv.buildPlatform != stdenv.targetPlatform) [
+  configureFlags = lib.optionals (stdenv.buildPlatform != stdenv.hostPlatform) [
     "lf_cv_sane_realloc=yes"
   ];
 
diff --git a/pkgs/development/libraries/tk/generic.nix b/pkgs/development/libraries/tk/generic.nix
index ab973c957ae..57a9b617d95 100644
--- a/pkgs/development/libraries/tk/generic.nix
+++ b/pkgs/development/libraries/tk/generic.nix
@@ -22,7 +22,7 @@ tcl.mkTclDerivation {
       substituteInPlace $file --replace "exec wish" "exec $out/bin/wish"
     done
   ''
-  + lib.optionalString (stdenv.isDarwin && lib.versionOlder stdenv.targetPlatform.darwinMinVersion "11") ''
+  + lib.optionalString (stdenv.isDarwin && lib.versionOlder stdenv.hostPlatform.darwinMinVersion "11") ''
     substituteInPlace unix/configure* \
       --replace " -framework UniformTypeIdentifiers" ""
   '';
diff --git a/pkgs/development/libraries/v8/default.nix b/pkgs/development/libraries/v8/default.nix
index a9891a9d328..7edf2cdf7c4 100644
--- a/pkgs/development/libraries/v8/default.nix
+++ b/pkgs/development/libraries/v8/default.nix
@@ -136,7 +136,7 @@ stdenv.mkDerivation rec {
   ++ lib.optional stdenv.isDarwin ''use_lld=false'';
 
   env.NIX_CFLAGS_COMPILE = "-O2";
-  FORCE_MAC_SDK_MIN = stdenv.targetPlatform.sdkVer or "10.12";
+  FORCE_MAC_SDK_MIN = stdenv.hostPlatform.sdkVer or "10.12";
 
   nativeBuildInputs = [
     myGn
diff --git a/pkgs/development/libraries/vapoursynth/plugin-interface.nix b/pkgs/development/libraries/vapoursynth/plugin-interface.nix
index 064893a3dbc..f962634b131 100644
--- a/pkgs/development/libraries/vapoursynth/plugin-interface.nix
+++ b/pkgs/development/libraries/vapoursynth/plugin-interface.nix
@@ -36,7 +36,7 @@ plugins: let
     $CC -shared -fPIC ${source} -o "$out/lib/libvapoursynth-nix-plugins${ext}"
   '';
 
-  ext = stdenv.targetPlatform.extensions.sharedLibrary;
+  ext = stdenv.hostPlatform.extensions.sharedLibrary;
 in
 runCommand "${vapoursynth.name}-with-plugins" {
   nativeBuildInputs = [ makeWrapper ];
diff --git a/pkgs/development/libraries/wayland/protocols.nix b/pkgs/development/libraries/wayland/protocols.nix
index dc53bbb54d2..0fadb103ce3 100644
--- a/pkgs/development/libraries/wayland/protocols.nix
+++ b/pkgs/development/libraries/wayland/protocols.nix
@@ -9,7 +9,7 @@ stdenv.mkDerivation rec {
   version = "1.32";
 
   # https://gitlab.freedesktop.org/wayland/wayland-protocols/-/issues/48
-  doCheck = stdenv.hostPlatform == stdenv.buildPlatform && stdenv.targetPlatform.linker == "bfd" && wayland.withLibraries;
+  doCheck = stdenv.hostPlatform == stdenv.buildPlatform && stdenv.hostPlatform.linker == "bfd" && wayland.withLibraries;
 
   src = fetchurl {
     url = "https://gitlab.freedesktop.org/wayland/${pname}/-/releases/${version}/downloads/${pname}-${version}.tar.xz";
diff --git a/pkgs/development/python-modules/distlib/default.nix b/pkgs/development/python-modules/distlib/default.nix
index ca91e77a667..cf31574e6fd 100644
--- a/pkgs/development/python-modules/distlib/default.nix
+++ b/pkgs/development/python-modules/distlib/default.nix
@@ -19,7 +19,7 @@ buildPythonPackage rec {
     setuptools
   ];
 
-  postFixup = lib.optionalString (!stdenv.targetPlatform.isWindows) ''
+  postFixup = lib.optionalString (!stdenv.hostPlatform.isWindows) ''
     find $out -name '*.exe' -delete
   '';
 
diff --git a/pkgs/development/python-modules/jaxlib/default.nix b/pkgs/development/python-modules/jaxlib/default.nix
index ae479120ed1..c70ab0ac2b3 100644
--- a/pkgs/development/python-modules/jaxlib/default.nix
+++ b/pkgs/development/python-modules/jaxlib/default.nix
@@ -136,8 +136,8 @@ let
 
   arch =
     # KeyError: ('Linux', 'arm64')
-    if stdenv.targetPlatform.isLinux && stdenv.targetPlatform.linuxArch == "arm64" then "aarch64"
-    else stdenv.targetPlatform.linuxArch;
+    if stdenv.hostPlatform.isLinux && stdenv.hostPlatform.linuxArch == "arm64" then "aarch64"
+    else stdenv.hostPlatform.linuxArch;
 
   bazel-build = buildBazelPackage rec {
     name = "bazel-build-${pname}-${version}";
@@ -219,7 +219,7 @@ let
       build --python_path="${python}/bin/python"
       build --distinct_host_configuration=false
       build --define PROTOBUF_INCLUDE_PATH="${pkgs.protobuf}/include"
-    '' + lib.optionalString (stdenv.targetPlatform.avxSupport && stdenv.targetPlatform.isUnix) ''
+    '' + lib.optionalString (stdenv.hostPlatform.avxSupport && stdenv.hostPlatform.isUnix) ''
       build --config=avx_posix
     '' + lib.optionalString mklSupport ''
       build --config=mkl_open_source_only
@@ -298,13 +298,13 @@ let
     inherit meta;
   };
   platformTag =
-    if stdenv.targetPlatform.isLinux then
+    if stdenv.hostPlatform.isLinux then
       "manylinux2014_${arch}"
     else if stdenv.system == "x86_64-darwin" then
       "macosx_10_9_${arch}"
     else if stdenv.system == "aarch64-darwin" then
       "macosx_11_0_${arch}"
-    else throw "Unsupported target platform: ${stdenv.targetPlatform}";
+    else throw "Unsupported target platform: ${stdenv.hostPlatform}";
 
 in
 buildPythonPackage {
diff --git a/pkgs/development/python-modules/mido/default.nix b/pkgs/development/python-modules/mido/default.nix
index 65702b23c7a..84fe78a5947 100644
--- a/pkgs/development/python-modules/mido/default.nix
+++ b/pkgs/development/python-modules/mido/default.nix
@@ -23,7 +23,7 @@ buildPythonPackage rec {
   patches = [
     (substituteAll {
       src = ./libportmidi-cdll.patch;
-      libportmidi = "${portmidi.out}/lib/libportmidi${stdenv.targetPlatform.extensions.sharedLibrary}";
+      libportmidi = "${portmidi.out}/lib/libportmidi${stdenv.hostPlatform.extensions.sharedLibrary}";
     })
   ];
 
diff --git a/pkgs/development/python-modules/mpv/default.nix b/pkgs/development/python-modules/mpv/default.nix
index c956bb90aa8..3763e25660a 100644
--- a/pkgs/development/python-modules/mpv/default.nix
+++ b/pkgs/development/python-modules/mpv/default.nix
@@ -27,7 +27,7 @@ buildPythonPackage rec {
   postPatch = ''
     substituteInPlace mpv.py \
       --replace "sofile = ctypes.util.find_library('mpv')" \
-                'sofile = "${mpv}/lib/libmpv${stdenv.targetPlatform.extensions.sharedLibrary}"'
+                'sofile = "${mpv}/lib/libmpv${stdenv.hostPlatform.extensions.sharedLibrary}"'
   '';
 
   # tests impure, will error if it can't load libmpv.so
diff --git a/pkgs/development/python-modules/mysql-connector/default.nix b/pkgs/development/python-modules/mysql-connector/default.nix
index ba963ff0d5d..575c438eb55 100644
--- a/pkgs/development/python-modules/mysql-connector/default.nix
+++ b/pkgs/development/python-modules/mysql-connector/default.nix
@@ -35,7 +35,7 @@ buildPythonPackage rec {
   patches = [
     # mysql-connector overrides MACOSX_DEPLOYMENT_TARGET to 11.
     # This makes the installation with nixpkgs fail. I suspect, that's
-    # because stdenv.targetPlatform.darwinSdkVersion is (currently) set to
+    # because stdenv.hostPlatform.darwinSdkVersion is (currently) set to
     # 10.12. The patch reverts
     # https://github.com/mysql/mysql-connector-python/commit/d1e89fd3d7391084cdf35b0806cb5d2a4b413654
     ./0001-Revert-Fix-MacOS-wheels-platform-tag.patch
diff --git a/pkgs/development/python-modules/testpath/default.nix b/pkgs/development/python-modules/testpath/default.nix
index 5635a615615..eb66bea56f5 100644
--- a/pkgs/development/python-modules/testpath/default.nix
+++ b/pkgs/development/python-modules/testpath/default.nix
@@ -26,7 +26,7 @@ buildPythonPackage rec {
 
   # exe are only required when testpath is used on windows
   # https://github.com/jupyter/testpath/blob/de8ca59539eb23b9781e55848b7d2646c8c61df9/testpath/commands.py#L128
-  preBuild = lib.optionalString (!stdenv.targetPlatform.isWindows) ''
+  preBuild = lib.optionalString (!stdenv.hostPlatform.isWindows) ''
     rm testpath/cli-32.exe testpath/cli-64.exe
   '';
 
diff --git a/pkgs/development/python-modules/torch/default.nix b/pkgs/development/python-modules/torch/default.nix
index c9bf7c45766..4217b87e81e 100644
--- a/pkgs/development/python-modules/torch/default.nix
+++ b/pkgs/development/python-modules/torch/default.nix
@@ -189,7 +189,7 @@ in buildPythonPackage rec {
   ''
   # error: no member named 'aligned_alloc' in the global namespace; did you mean simply 'aligned_alloc'
   # This lib overrided aligned_alloc hence the error message. Tltr: his function is linkable but not in header.
-  + lib.optionalString (stdenv.isDarwin && lib.versionOlder stdenv.targetPlatform.darwinSdkVersion "11.0") ''
+  + lib.optionalString (stdenv.isDarwin && lib.versionOlder stdenv.hostPlatform.darwinSdkVersion "11.0") ''
     substituteInPlace third_party/pocketfft/pocketfft_hdronly.h --replace '#if __cplusplus >= 201703L
     inline void *aligned_alloc(size_t align, size_t size)' '#if __cplusplus >= 201703L && 0
     inline void *aligned_alloc(size_t align, size_t size)'
diff --git a/pkgs/development/tools/azure-functions-core-tools/default.nix b/pkgs/development/tools/azure-functions-core-tools/default.nix
index e187dbf6b39..cf039c5758f 100644
--- a/pkgs/development/tools/azure-functions-core-tools/default.nix
+++ b/pkgs/development/tools/azure-functions-core-tools/default.nix
@@ -27,7 +27,7 @@
     };
   };
 
-  platformInfo = builtins.getAttr stdenv.targetPlatform.system platforms;
+  platformInfo = builtins.getAttr stdenv.hostPlatform.system platforms;
 in
   stdenv.mkDerivation rec {
     pname = "azure-functions-core-tools";
diff --git a/pkgs/development/tools/azure-static-sites-client/default.nix b/pkgs/development/tools/azure-static-sites-client/default.nix
index 5ac8f971cf3..441496ed435 100644
--- a/pkgs/development/tools/azure-static-sites-client/default.nix
+++ b/pkgs/development/tools/azure-static-sites-client/default.nix
@@ -28,7 +28,7 @@ stdenv.mkDerivation {
   pname = "StaticSitesClient-${versionFlavor}";
   version = flavor.buildId;
 
-  src = sources.${stdenv.targetPlatform.system} or (throw "Unsupported platform");
+  src = sources.${stdenv.hostPlatform.system} or (throw "Unsupported platform");
 
   nativeBuildInputs = [
     autoPatchelfHook
diff --git a/pkgs/development/tools/faas-cli/default.nix b/pkgs/development/tools/faas-cli/default.nix
index 383ca092944..026dbbcc548 100644
--- a/pkgs/development/tools/faas-cli/default.nix
+++ b/pkgs/development/tools/faas-cli/default.nix
@@ -37,7 +37,7 @@ buildGoModule rec {
     "-s" "-w"
     "-X github.com/openfaas/faas-cli/version.GitCommit=ref/tags/${version}"
     "-X github.com/openfaas/faas-cli/version.Version=${version}"
-    "-X github.com/openfaas/faas-cli/commands.Platform=${faasPlatform stdenv.targetPlatform}"
+    "-X github.com/openfaas/faas-cli/commands.Platform=${faasPlatform stdenv.hostPlatform}"
   ];
 
   nativeBuildInputs = [ makeWrapper installShellFiles ];
diff --git a/pkgs/games/cataclysm-dda/common.nix b/pkgs/games/cataclysm-dda/common.nix
index 41579b52710..fb54efee1dd 100644
--- a/pkgs/games/cataclysm-dda/common.nix
+++ b/pkgs/games/cataclysm-dda/common.nix
@@ -53,7 +53,7 @@ stdenv.mkDerivation {
   ] ++ optionals stdenv.isDarwin [
     "NATIVE=osx"
     "CLANG=1"
-    "OSX_MIN=${stdenv.targetPlatform.darwinMinVersion}"
+    "OSX_MIN=${stdenv.hostPlatform.darwinMinVersion}"
   ];
 
   postInstall = optionalString tiles
diff --git a/pkgs/games/dwarf-fortress/dwarf-therapist/wrapper.nix b/pkgs/games/dwarf-fortress/dwarf-therapist/wrapper.nix
index dad59953533..eaf391bbe6b 100644
--- a/pkgs/games/dwarf-fortress/dwarf-therapist/wrapper.nix
+++ b/pkgs/games/dwarf-fortress/dwarf-therapist/wrapper.nix
@@ -2,7 +2,7 @@
 
 let
   platformSlug =
-    if stdenv.targetPlatform.is32bit then
+    if stdenv.hostPlatform.is32bit then
       "linux32" else "linux64";
   inifile = "linux/v0.${dwarf-fortress.baseVersion}.${dwarf-fortress.patchVersion}_${platformSlug}.ini";
 
diff --git a/pkgs/games/enigma/default.nix b/pkgs/games/enigma/default.nix
index c9f16918b49..e2e9ca1338c 100644
--- a/pkgs/games/enigma/default.nix
+++ b/pkgs/games/enigma/default.nix
@@ -39,7 +39,7 @@ stdenv.mkDerivation rec {
     description = "Puzzle game inspired by Oxyd on the Atari ST and Rock'n'Roll on the Amiga";
     license = with licenses; [ gpl2 free ]; # source + bundles libs + art
     platforms = platforms.unix;
-    broken = stdenv.targetPlatform.isDarwin;
+    broken = stdenv.hostPlatform.isDarwin;
     maintainers = with maintainers; [ iblech ];
     homepage = "https://www.nongnu.org/enigma/";
   };
diff --git a/pkgs/misc/cups/default.nix b/pkgs/misc/cups/default.nix
index ba414d7aec5..c8df29776db 100644
--- a/pkgs/misc/cups/default.nix
+++ b/pkgs/misc/cups/default.nix
@@ -40,7 +40,7 @@ stdenv.mkDerivation rec {
       # service would stop the socket and break subsequent socket activations.
       # See https://github.com/apple/cups/issues/6005
       sed -i '/PartOf=cups.service/d' scheduler/cups.socket.in
-  '' + lib.optionalString (stdenv.isDarwin && lib.versionOlder stdenv.targetPlatform.darwinSdkVersion "12") ''
+  '' + lib.optionalString (stdenv.hostPlatform.isDarwin && lib.versionOlder stdenv.hostPlatform.darwinSdkVersion "12") ''
     substituteInPlace backend/usb-darwin.c \
       --replace "kIOMainPortDefault" "kIOMasterPortDefault"
   '';
diff --git a/pkgs/misc/cups/drivers/canon/default.nix b/pkgs/misc/cups/drivers/canon/default.nix
index 40438d333cf..8614bdda2ab 100644
--- a/pkgs/misc/cups/drivers/canon/default.nix
+++ b/pkgs/misc/cups/drivers/canon/default.nix
@@ -26,9 +26,9 @@
 
 let
   system =
-    if stdenv.targetPlatform.system == "x86_64-linux" then "intel"
-    else if stdenv.targetPlatform.system == "aarch64-linux" then "arm"
-    else throw "Unsupported platform for Canon UFR2 Drivers: ${stdenv.targetPlatform.system}";
+    if stdenv.hostPlatform.system == "x86_64-linux" then "intel"
+    else if stdenv.hostPlatform.system == "aarch64-linux" then "arm"
+    else throw "Unsupported platform for Canon UFR2 Drivers: ${stdenv.hostPlatform.system}";
   ld64 = "${stdenv.cc}/nix-support/dynamic-linker";
   libs = pkgs: lib.makeLibraryPath buildInputs;
 
diff --git a/pkgs/os-specific/darwin/moltenvk/default.nix b/pkgs/os-specific/darwin/moltenvk/default.nix
index 41f929fe90f..2293720d7fa 100644
--- a/pkgs/os-specific/darwin/moltenvk/default.nix
+++ b/pkgs/os-specific/darwin/moltenvk/default.nix
@@ -109,7 +109,7 @@ stdenv.mkDerivation (finalAttrs: {
       -configuration Release \
       -project MoltenVKShaderConverter.xcodeproj \
       -scheme MoltenVKShaderConverter \
-      -arch ${stdenv.targetPlatform.darwinArch}
+      -arch ${stdenv.hostPlatform.darwinArch}
     declare -A products=( [MoltenVKShaderConverter]=bin [libMoltenVKShaderConverter.a]=lib )
     for product in "''${!products[@]}"; do
       cp MoltenVKShaderConverter-*/Build/Products/Release/$product "$build/''${products[$product]}/$product"
@@ -127,7 +127,7 @@ stdenv.mkDerivation (finalAttrs: {
       -configuration Release \
       -project MoltenVK.xcodeproj \
       -scheme MoltenVK-macOS \
-      -arch ${stdenv.targetPlatform.darwinArch}
+      -arch ${stdenv.hostPlatform.darwinArch}
     cp MoltenVK-*/Build/Products/Release/dynamic/libMoltenVK.dylib "$build/lib/libMoltenVK.dylib"
     popd
   '';
diff --git a/pkgs/os-specific/linux/bionic-prebuilt/default.nix b/pkgs/os-specific/linux/bionic-prebuilt/default.nix
index da5011e6737..3ce10735f1d 100644
--- a/pkgs/os-specific/linux/bionic-prebuilt/default.nix
+++ b/pkgs/os-specific/linux/bionic-prebuilt/default.nix
@@ -5,7 +5,7 @@
 let
 
   choosePlatform =
-    let pname = stdenv.targetPlatform.parsed.cpu.name; in
+    let pname = stdenv.hostPlatform.parsed.cpu.name; in
     pset: pset.${pname} or (throw "bionic-prebuilt: unsupported platform ${pname}");
 
   prebuilt_crt = choosePlatform {
@@ -66,7 +66,7 @@ in
 stdenvNoCC.mkDerivation rec {
   pname = "bionic-prebuilt";
   version = "ndk-release-r23";
-  name = "${stdenv.targetPlatform.parsed.cpu.name}-${pname}-${version}";
+  name = "${stdenv.hostPlatform.parsed.cpu.name}-${pname}-${version}";
 
   src = fetchzip {
     url = "https://android.googlesource.com/platform/bionic/+archive/00e8ce1142d8823b0d2fc8a98b40119b0f1f02cd.tar.gz";
diff --git a/pkgs/os-specific/linux/criu/default.nix b/pkgs/os-specific/linux/criu/default.nix
index 7940ce060e4..00d46591c13 100644
--- a/pkgs/os-specific/linux/criu/default.nix
+++ b/pkgs/os-specific/linux/criu/default.nix
@@ -88,9 +88,9 @@ stdenv.mkDerivation rec {
     "PREFIX=$(out)"
     "ASCIIDOC=${buildPackages.asciidoc}/bin/asciidoc"
     "XMLTO=${buildPackages.xmlto}/bin/xmlto"
-  ] ++ (lib.optionals (stdenv.buildPlatform != stdenv.targetPlatform) [
-    "ARCH=${linuxArchMapping."${stdenv.targetPlatform.linuxArch}"}"
-    "CROSS_COMPILE=${stdenv.targetPlatform.config}-"
+  ] ++ (lib.optionals (stdenv.buildPlatform != stdenv.hostPlatform) [
+    "ARCH=${linuxArchMapping."${stdenv.hostPlatform.linuxArch}"}"
+    "CROSS_COMPILE=${stdenv.hostPlatform.config}-"
   ]);
 
   outputs = [ "out" "dev" "man" ];
diff --git a/pkgs/os-specific/linux/nmon/default.nix b/pkgs/os-specific/linux/nmon/default.nix
index 768e8e43edc..30285f9c5b2 100644
--- a/pkgs/os-specific/linux/nmon/default.nix
+++ b/pkgs/os-specific/linux/nmon/default.nix
@@ -12,7 +12,7 @@ stdenv.mkDerivation rec {
   buildInputs = [ ncurses ];
   dontUnpack = true;
   buildPhase = "${stdenv.cc.targetPrefix}cc -o nmon ${src} -g -O2 -D JFS -D GETUSER -Wall -D LARGEMEM -lncurses -lm -g -D ${
-    with stdenv.targetPlatform;
+    with stdenv.hostPlatform;
     if isx86 then "X86"
     else if isAarch then "ARM"
     else if isPower then "POWER"
diff --git a/pkgs/servers/dante/default.nix b/pkgs/servers/dante/default.nix
index a5806a20d41..1d15bddc09f 100644
--- a/pkgs/servers/dante/default.nix
+++ b/pkgs/servers/dante/default.nix
@@ -18,7 +18,7 @@ stdenv.mkDerivation rec {
 
   configureFlags = if !stdenv.isDarwin
     then [ "--with-libc=libc.so.6" ]
-    else [ "--with-libc=libc${stdenv.targetPlatform.extensions.sharedLibrary}" ];
+    else [ "--with-libc=libc${stdenv.hostPlatform.extensions.sharedLibrary}" ];
 
   dontAddDisableDepTrack = stdenv.isDarwin;
 
diff --git a/pkgs/servers/dns/knot-resolver/default.nix b/pkgs/servers/dns/knot-resolver/default.nix
index 8df8b1807f0..28fe866dfdc 100644
--- a/pkgs/servers/dns/knot-resolver/default.nix
+++ b/pkgs/servers/dns/knot-resolver/default.nix
@@ -83,7 +83,7 @@ unwrapped = stdenv.mkDerivation rec {
   postInstall = ''
     rm "$out"/lib/libkres.a
     rm "$out"/lib/knot-resolver/upgrade-4-to-5.lua # not meaningful on NixOS
-  '' + optionalString stdenv.targetPlatform.isLinux ''
+  '' + optionalString stdenv.hostPlatform.isLinux ''
     rm -r "$out"/lib/sysusers.d/ # ATM more likely to harm than help
   '';
 
diff --git a/pkgs/servers/matrix-synapse/matrix-hookshot/default.nix b/pkgs/servers/matrix-synapse/matrix-hookshot/default.nix
index 6113bd6ff41..f784036075c 100644
--- a/pkgs/servers/matrix-synapse/matrix-hookshot/default.nix
+++ b/pkgs/servers/matrix-synapse/matrix-hookshot/default.nix
@@ -59,7 +59,7 @@ mkYarnPackage rec {
   buildPhase = ''
     runHook preBuild
     cd deps/${pname}
-    napi build --target ${stdenv.targetPlatform.rust.rustcTargetSpec} --dts ../src/libRs.d.ts --release ./lib
+    napi build --target ${stdenv.hostPlatform.rust.rustcTargetSpec} --dts ../src/libRs.d.ts --release ./lib
     yarn run build:app:fix-defs
     yarn run build:app
     yarn run build:web
diff --git a/pkgs/servers/monitoring/grafana/plugins/grafana-plugin.nix b/pkgs/servers/monitoring/grafana/plugins/grafana-plugin.nix
index 7894e759b16..09fed144e57 100644
--- a/pkgs/servers/monitoring/grafana/plugins/grafana-plugin.nix
+++ b/pkgs/servers/monitoring/grafana/plugins/grafana-plugin.nix
@@ -1,7 +1,7 @@
 { stdenvNoCC, fetchurl, unzip, lib }:
 
 { pname, version, zipHash, meta ? {}, passthru ? {}, ... }@args:
-let plat = stdenvNoCC.targetPlatform.system; in stdenvNoCC.mkDerivation ({
+let plat = stdenvNoCC.hostPlatform.system; in stdenvNoCC.mkDerivation ({
   inherit pname version;
 
   src = if lib.isAttrs zipHash then
diff --git a/pkgs/servers/mpd/default.nix b/pkgs/servers/mpd/default.nix
index aa781f7e26f..df166ad0ff0 100644
--- a/pkgs/servers/mpd/default.nix
+++ b/pkgs/servers/mpd/default.nix
@@ -148,7 +148,7 @@ let
 
       depsBuildBuild = [ buildPackages.stdenv.cc ];
 
-      postPatch = lib.optionalString (stdenv.isDarwin && lib.versionOlder stdenv.targetPlatform.darwinSdkVersion "12.0") ''
+      postPatch = lib.optionalString (stdenv.isDarwin && lib.versionOlder stdenv.hostPlatform.darwinSdkVersion "12.0") ''
         substituteInPlace src/output/plugins/OSXOutputPlugin.cxx \
           --replace kAudioObjectPropertyElement{Main,Master} \
           --replace kAudioHardwareServiceDeviceProperty_Virtual{Main,Master}Volume
diff --git a/pkgs/servers/networkaudiod/default.nix b/pkgs/servers/networkaudiod/default.nix
index 5a09c7933d1..dacd315aba3 100644
--- a/pkgs/servers/networkaudiod/default.nix
+++ b/pkgs/servers/networkaudiod/default.nix
@@ -6,7 +6,7 @@
 , alsa-lib
 }:
 let
-  inherit (stdenv.targetPlatform) system;
+  inherit (stdenv.hostPlatform) system;
   throwSystem = throw "Unsupported system: ${system}";
 in
 stdenv.mkDerivation rec {
diff --git a/pkgs/servers/nosql/arangodb/default.nix b/pkgs/servers/nosql/arangodb/default.nix
index 36c978e364f..52b9125e99d 100644
--- a/pkgs/servers/nosql/arangodb/default.nix
+++ b/pkgs/servers/nosql/arangodb/default.nix
@@ -15,12 +15,12 @@
 , lzo
 , which
 , targetArchitecture ? null
-, asmOptimizations ? gcc10Stdenv.targetPlatform.isx86
+, asmOptimizations ? gcc10Stdenv.hostPlatform.isx86
 }:
 
 let
   defaultTargetArchitecture =
-    if gcc10Stdenv.targetPlatform.isx86
+    if gcc10Stdenv.hostPlatform.isx86
     then "haswell"
     else "core";
 
@@ -72,7 +72,7 @@ gcc10Stdenv.mkDerivation rec {
     "-DTARGET_ARCHITECTURE=${targetArch}"
   ] ++ lib.optionals asmOptimizations [
     "-DASM_OPTIMIZATIONS=ON"
-    "-DHAVE_SSE42=${if gcc10Stdenv.targetPlatform.sse4_2Support then "ON" else "OFF"}"
+    "-DHAVE_SSE42=${if gcc10Stdenv.hostPlatform.sse4_2Support then "ON" else "OFF"}"
   ];
 
   meta = with lib; {
diff --git a/pkgs/tools/compression/zfp/default.nix b/pkgs/tools/compression/zfp/default.nix
index d63140b1476..fdb005007f1 100644
--- a/pkgs/tools/compression/zfp/default.nix
+++ b/pkgs/tools/compression/zfp/default.nix
@@ -2,7 +2,7 @@
 , config
 , enableCfp ? true
 , enableCuda ? config.cudaSupport
-, enableFortran ? builtins.elem stdenv.targetPlatform.system gfortran.meta.platforms
+, enableFortran ? builtins.elem stdenv.hostPlatform.system gfortran.meta.platforms
 , enableOpenMP ? true
 , enablePython ? true
 , enableUtilities ? true }:
diff --git a/pkgs/tools/games/pocket-updater-utility/default.nix b/pkgs/tools/games/pocket-updater-utility/default.nix
index ef52b388ae8..2d841c00c51 100644
--- a/pkgs/tools/games/pocket-updater-utility/default.nix
+++ b/pkgs/tools/games/pocket-updater-utility/default.nix
@@ -6,7 +6,7 @@
 , dotnetCorePackages ? pkgs.dotnetCorePackages
 , openssl ? pkgs.openssl
 , zlib ? pkgs.zlib
-, targetPlatform ? pkgs.targetPlatform
+, hostPlatform ? stdenv.hostPlatform
 }:
 
 buildDotnetModule rec {
@@ -30,7 +30,7 @@ buildDotnetModule rec {
   patches = [ ./add-runtime-identifier.patch ];
   postPatch = ''
     substituteInPlace pocket_updater.csproj \
-      --replace @RuntimeIdentifier@ "${dotnetCorePackages.systemToDotnetRid targetPlatform.system}"
+      --replace @RuntimeIdentifier@ "${dotnetCorePackages.systemToDotnetRid hostPlatform.system}"
   '';
 
   projectFile = "pocket_updater.csproj";
diff --git a/pkgs/tools/misc/shim/default.nix b/pkgs/tools/misc/shim/default.nix
index 1615a6d8c79..0989a37454c 100644
--- a/pkgs/tools/misc/shim/default.nix
+++ b/pkgs/tools/misc/shim/default.nix
@@ -3,7 +3,7 @@
 
 let
 
-  inherit (stdenv.targetPlatform) system;
+  inherit (stdenv.hostPlatform) system;
   throwSystem = throw "Unsupported system: ${system}";
 
   target = {
diff --git a/pkgs/tools/misc/vector/default.nix b/pkgs/tools/misc/vector/default.nix
index 7c4afb16ebc..f0c48dd9796 100644
--- a/pkgs/tools/misc/vector/default.nix
+++ b/pkgs/tools/misc/vector/default.nix
@@ -27,7 +27,7 @@
     # the second feature flag is passed to the rdkafka dependency
     # building on linux fails without this feature flag (both x86_64 and AArch64)
     ++ lib.optionals enableKafka [ "rdkafka?/gssapi-vendored" ]
-    ++ lib.optional stdenv.targetPlatform.isUnix "unix")
+    ++ lib.optional stdenv.hostPlatform.isUnix "unix")
 , nixosTests
 , nix-update-script
 }:
diff --git a/pkgs/tools/networking/rosenpass/default.nix b/pkgs/tools/networking/rosenpass/default.nix
index 9467904fe69..790d1d9cecd 100644
--- a/pkgs/tools/networking/rosenpass/default.nix
+++ b/pkgs/tools/networking/rosenpass/default.nix
@@ -2,7 +2,7 @@
 , fetchFromGitHub
 , nixosTests
 , rustPlatform
-, targetPlatform
+, hostPlatform
 , installShellFiles
 , cmake
 , libsodium
@@ -32,7 +32,7 @@ rustPlatform.buildRustPackage rec {
 
   # nix defaults to building for aarch64 _without_ the armv8-a
   # crypto extensions, but liboqs depends on these
-  preBuild = lib.optionalString targetPlatform.isAarch64 ''
+  preBuild = lib.optionalString hostPlatform.isAarch64 ''
     NIX_CFLAGS_COMPILE="$NIX_CFLAGS_COMPILE -march=armv8-a+crypto"
   '';
 
diff --git a/pkgs/tools/video/blackmagic-desktop-video/default.nix b/pkgs/tools/video/blackmagic-desktop-video/default.nix
index dc6f2eff787..435db1221ea 100644
--- a/pkgs/tools/video/blackmagic-desktop-video/default.nix
+++ b/pkgs/tools/video/blackmagic-desktop-video/default.nix
@@ -44,7 +44,7 @@ stdenv.mkDerivation rec {
       SITEURL = "https://www.blackmagicdesign.com/api/register/us/download/${DOWNLOADID}";
 
       USERAGENT = builtins.concatStringsSep " " [
-        "User-Agent: Mozilla/5.0 (X11; Linux ${stdenv.targetPlatform.linuxArch})"
+        "User-Agent: Mozilla/5.0 (X11; Linux ${stdenv.hostPlatform.linuxArch})"
         "AppleWebKit/537.36 (KHTML, like Gecko)"
         "Chrome/77.0.3865.75"
         "Safari/537.36"