rtags: fix for clang/libc++ 4

This also fixes a missing header in the SDK that rtags needs to work
properly. The underlying cause is that C++ headers got shuffled around a
lot in libc++ 3.8 (I believe) and became more standards-compliant, which
led to a lot of C-compatible passthrough header files being added to it
like math.h, which defines some C++-compatible versions of standard
functions like signbit, while #include_next'ing the system math.h. In
this case, including the SDK was stuffing another math.h in front of the
libc++ shim, which led to all sorts of mysterious failures.

1 files changed, 1 insertions, 0 deletions

diff --git a/pkgs/os-specific/darwin/apple-sdk/default.nix b/pkgs/os-specific/darwin/apple-sdk/default.nix
index 536e62f777e..73126ce1f5c 100644
--- a/pkgs/os-specific/darwin/apple-sdk/default.nix
+++ b/pkgs/os-specific/darwin/apple-sdk/default.nix
@@ -157,6 +157,7 @@ in rec {
         mkdir -p $out/include
         pushd $out/include >/dev/null
         ln -s "${sdk}/include/xpc"
+        ln -s "${sdk}/include/launch.h"
         popd >/dev/null
       '';
     };