From 000c2c51fdfffcd0b0cc91011d53080bf1f6513c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ludovic=20Court=C3=A8s?= <ludo@gnu.org>
Date: Fri, 21 May 2010 13:46:46 +0000
Subject: [PATCH] GCC 4.5: Patch the spec string for GNU/Hurd to add the right
 `-I' flags.

svn path=/nixpkgs/trunk/; revision=21934
---
 .../development/compilers/gcc-4.5/default.nix | 21 +++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/pkgs/development/compilers/gcc-4.5/default.nix b/pkgs/development/compilers/gcc-4.5/default.nix
index 62a4e01803d..6f7854794b7 100644
--- a/pkgs/development/compilers/gcc-4.5/default.nix
+++ b/pkgs/development/compilers/gcc-4.5/default.nix
@@ -143,6 +143,27 @@ stdenv.mkDerivation ({
     ++ optional langVhdl ./ghdl-ortho-cflags.patch
     ;
 
+  postPatch =
+    if (stdenv.system == "i586-pc-gnu"
+        || (cross != null && cross.config == "i586-pc-gnu"
+            && libcCross != null))
+    then
+      # On GNU/Hurd glibc refers to Hurd & Mach headers so add the right `-I'
+      # flags to the default spec string.
+      let
+        libc = if cross != null then libcCross else stdenv.glibc;
+        config_h = "gcc/config/i386/gnu.h";
+        extraCPPSpec =
+          concatStrings (intersperse " "
+                          (map (x: "-I${x}/include")
+                               libc.propagatedBuildInputs));
+      in
+        '' echo "augmenting \`CPP_SPEC' in \`${config_h}' with \`${extraCPPSpec}'..."
+           sed -i "${config_h}" \
+               -es'|CPP_SPEC *"\(.*\)$|CPP_SPEC "${extraCPPSpec} \1|g'
+        ''
+    else null;
+
   inherit noSysDirs profiledCompiler staticCompiler langJava crossStageStatic
     libcCross crossMingw;