GCC 4.5: Add patch to fix GNU/Hurd builds.

svn path=/nixpkgs/trunk/; revision=21903

pkgs/development/compilers/gcc-4.5/default.nix

@@ -132,7 +132,7 @@ stdenv.mkDerivation ({
   };
 
   patches =
-    [ ]
+    [ ./softfp-hurd.patch ]
     ++ optional (cross != null) ./libstdc++-target.patch
     ++ optional noSysDirs ./no-sys-dirs.patch
     # The GNAT Makefiles did not pay attention to CFLAGS_FOR_TARGET for its

pkgs/development/compilers/gcc-4.5/softfp-hurd.patch

@@ -0,0 +1,32 @@
+This patch fixes undefined references to softp symbols (__multf3, __fixunstfsi,
+__subtf3, etc.) in libgcc_s.so on GNU/Hurd.
+
+Taken from <http://gcc.gnu.org/ml/gcc-patches/2010-04/msg00602.html>, with second
+hunk adjusted so that it applies to GCC 4.5.0.
+
+diff --git a/gcc/config.gcc b/gcc/config.gcc
+index 9e499cb..9aec392 100644
+--- a/gcc/config.gcc
++++ b/gcc/config.gcc
+@@ -3070,7 +3070,9 @@ case ${target} in
+ 	i[34567]86-*-darwin* | x86_64-*-darwin*)
+ 		tmake_file="${tmake_file} i386/t-fprules-softfp soft-fp/t-softfp"
+ 		;;
+-	i[34567]86-*-linux* | x86_64-*-linux* | i[34567]86-*-kfreebsd*-gnu | x86_64-*-kfreebsd*-gnu)
++	i[34567]86-*-linux* | x86_64-*-linux* | \
++	  i[34567]86-*-kfreebsd*-gnu | x86_64-*-kfreebsd*-gnu | \
++	  i[34567]86-*-gnu*)
+ 		tmake_file="${tmake_file} i386/t-fprules-softfp soft-fp/t-softfp i386/t-linux"
+ 		;;
+ 	ia64*-*-linux*)
+diff --git a/libgcc/config.host b/libgcc/config.host
+--- a/libgcc/config.host
++++ b/libgcc/config.host
+@@ -600,6 +600,7 @@ case ${host} in
+ i[34567]86-*-darwin* | x86_64-*-darwin* | \
+   i[34567]86-*-kfreebsd*-gnu | x86_64-*-kfreebsd*-gnu | \
+   i[34567]86-*-linux* | x86_64-*-linux* | \
++  i[34567]86-*-gnu* | \
+   i[34567]86-*-solaris2* | \
+   i[34567]86-*-cygwin* | i[34567]86-*-mingw* | x86_64-*-mingw*)
+ 	if test "${host_address}" = 32; then