gamin: Fix cross compiling issues

Gamin fails to build cross-platform because it tries to run
AC_RUN_IFELSE during configure which fails as the test program is built
for the wrong platform and cannot execute. Since the test is only for
the 'abstract socket namespace' feature, we can just pin the results
for out builds, it is 'yes' for Linux and 'no' for Darwin (and other
BSD).

2 files changed, 79 insertions, 4 deletions

diff --git a/pkgs/development/libraries/gamin/abstract-socket-namespace.patch b/pkgs/development/libraries/gamin/abstract-socket-namespace.patch
new file mode 100644
index 00000000000..ff161055972
--- /dev/null
+++ b/pkgs/development/libraries/gamin/abstract-socket-namespace.patch
@@ -0,0 +1,73 @@
+From 737452159d521aef2041a2767f3ebf9f68f4b6a9 Mon Sep 17 00:00:00 2001
+From: Christian Kampka <christian@kampka.net>
+Date: Tue, 1 Sep 2020 13:54:35 +0200
+Subject: [PATCH] Pin abstract namespace sockets to host_os
+
+Running programs with AC_RUN_IFELSE fails when cross-compiling.
+Since abstract namespace sockets are linux feature, we can easily
+assume it is available for linux and not for darwin.
+---
+ configure.in | 47 ++++++-----------------------------------------
+ 1 file changed, 6 insertions(+), 41 deletions(-)
+
+diff --git a/configure.in b/configure.in
+index eb129db..0ed82ba 100644
+--- a/configure.in
++++ b/configure.in
+@@ -387,47 +387,12 @@ fi
+ 
+ #### Abstract sockets
+ 
+-AC_MSG_CHECKING(abstract socket namespace)
+-AC_LANG_PUSH(C)
+-AC_RUN_IFELSE([AC_LANG_PROGRAM(
+-[[
+-#include <sys/types.h>
+-#include <stdlib.h>
+-#include <string.h>
+-#include <stdio.h>
+-#include <sys/socket.h>
+-#include <sys/un.h>
+-#include <errno.h>
+-]],
+-[[
+-  int listen_fd;
+-  struct sockaddr_un addr;
+-  
+-  listen_fd = socket (PF_UNIX, SOCK_STREAM, 0);
+-  
+-  if (listen_fd < 0)
+-    {
+-      fprintf (stderr, "socket() failed: %s\n", strerror (errno));
+-      exit (1);
+-    }
+-
+-  memset (&addr, '\0', sizeof (addr));
+-  addr.sun_family = AF_UNIX;
+-  strcpy (addr.sun_path, "X/tmp/dbus-fake-socket-path-used-in-configure-test");
+-  addr.sun_path[0] = '\0'; /* this is what makes it abstract */
+-  
+-  if (bind (listen_fd, (struct sockaddr*) &addr, SUN_LEN (&addr)) < 0)
+-    {
+-       fprintf (stderr, "Abstract socket namespace bind() failed: %s\n", 
+-                strerror (errno));
+-       exit (1);
+-    }
+-  else 
+-    exit (0);
+-]])],
+-              [have_abstract_sockets=yes],
+-              [have_abstract_sockets=no])
+-AC_LANG_POP(C)
++AC_MSG_CHECKING([whether target os has abstract socket namespace])
++if test x$target_os = xlinux-gnu ; then
++    have_abstract_sockets=yes
++else
++    have_abstract_sockets=no
++fi	
+ AC_MSG_RESULT($have_abstract_sockets)
+ 
+ if test x$enable_abstract_sockets = xyes; then
+-- 
+2.25.4
+
diff --git a/pkgs/development/libraries/gamin/default.nix b/pkgs/development/libraries/gamin/default.nix
index 38451571d8b..89096c88745 100644
--- a/pkgs/development/libraries/gamin/default.nix
+++ b/pkgs/development/libraries/gamin/default.nix
@@ -1,6 +1,8 @@
-{ stdenv, fetchurl, fetchpatch, pkgconfig, glib }:
+{ stdenv, fetchurl, fetchpatch, pkgconfig, glib, autoreconfHook }:
 
-stdenv.mkDerivation (rec {
+let
+  cross = stdenv.hostPlatform != stdenv.buildPlatform;
+in stdenv.mkDerivation (rec {
   name = "gamin-0.1.10";
 
   src = fetchurl {
@@ -8,7 +10,7 @@ stdenv.mkDerivation (rec {
     sha256 = "18cr51y5qacvs2fc2p1bqv32rs8bzgs6l67zhasyl45yx055y218";
   };
 
-  nativeBuildInputs = [ pkgconfig ];
+  nativeBuildInputs = [ pkgconfig autoreconfHook ];
 
   buildInputs = [ glib ];
 
@@ -27,7 +29,7 @@ stdenv.mkDerivation (rec {
       name = "fix-pthread-mutex.patch";
       url = "https://git.alpinelinux.org/aports/plain/main/gamin/fix-pthread-mutex.patch?h=3.4-stable&id=a1a836b089573752c1b0da7d144c0948b04e8ea8";
       sha256 = "13igdbqsxb3sz0h417k6ifmq2n4siwqspj6slhc7fdl5wd1fxmdz";
-    });
+    }) ++ stdenv.lib.optional (cross) ./abstract-socket-namespace.patch ;
 
 
   meta = with stdenv.lib; {