GCC bug 46501

# Bug report
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46501

# Compile
sudo apt-get install cvs texinfo
mkdir mingw && cd mingw
svn co https://mingw-w64.svn.sourceforge.net/svnroot/mingw-w64/trunk
svn co https://mingw-w64.svn.sourceforge.net/svnroot/mingw-w64/experimental
cd experimental/buildsystem && colormake -ifmakebuildroot.mk

# Without patch
build/root/bin/x86_64-w64-mingw32-g++ --print-search-dirs|grep libraries
libraries: =/mnt/nfs/source/Programs/MinGW/mingw-w64/experimental/buildsystem/build/root/lib/gcc/x86_64-w64-mingw32/4.8.0/:/mnt/nfs/source/Programs/MinGW/mingw-w64/experimental/buildsystem/build/root/lib/gcc/x86_64-w64-mingw32/4.8.0/../../../../x86_64-w64-mingw32/lib/x86_64-w64-mingw32/4.8.0/:/mnt/nfs/source/Programs/MinGW/mingw-w64/experimental/buildsystem/build/root/lib/gcc/x86_64-w64-mingw32/4.8.0/../../../../x86_64-w64-mingw32/lib/../lib/:/mnt/nfs/source/Programs/MinGW/mingw-w64/experimental/buildsystem/build/root/mingw/lib/x86_64-w64-mingw32/4.8.0/:/mnt/nfs/source/Programs/MinGW/mingw-w64/experimental/buildsystem/build/root/mingw/lib/../lib/:/mnt/nfs/source/Programs/MinGW/mingw-w64/experimental/buildsystem/build/root/lib/gcc/x86_64-w64-mingw32/4.8.0/../../../../x86_64-w64-mingw32/lib/:/mnt/nfs/source/Programs/MinGW/mingw-w64/experimental/buildsystem/build/root/mingw/lib/

# With patch
cat build/gcc/src/bug.46501.patch
diff -r 74bc9e3ae6c4 gcc/incpath.c
--- a/gcc/incpath.c    Mon Apr 16 14:36:36 2012 -0600
+++ b/gcc/incpath.c    Mon Apr 16 14:41:30 2012 -0600
@@ -175,8 +175,7 @@
         str = concat (sysroot_no_trailing_dir_separator, p->fname, NULL);
         free (sysroot_no_trailing_dir_separator);
       }
-    else if (!p->add_sysroot && relocated
-         && !filename_ncmp (p->fname, cpp_PREFIX, cpp_PREFIX_len))
+    if (relocated && !filename_ncmp (p->fname, cpp_PREFIX, cpp_PREFIX_len))
       {
         static const char *relocated_prefix;
         /* If this path starts with the configure-time prefix,
cd build/gcc/src && patch -p1<bug.46501.patch && cd ../../..
rm build/gcc/obj/.compile.marker && colormake -ifmakebuildroot.mk
build/root/bin/x86_64-w64-mingw32-g++ --print-search-dirs|grep libraries
libraries: =/mnt/nfs/source/Programs/MinGW/mingw-w64/experimental/buildsystem/build/root/lib/gcc/x86_64-w64-mingw32/4.8.0/:/mnt/nfs/source/Programs/MinGW/mingw-w64/experimental/buildsystem/build/root/lib/gcc/x86_64-w64-mingw32/4.8.0/../../../../x86_64-w64-mingw32/lib/x86_64-w64-mingw32/4.8.0/:/mnt/nfs/source/Programs/MinGW/mingw-w64/experimental/buildsystem/build/root/lib/gcc/x86_64-w64-mingw32/4.8.0/../../../../x86_64-w64-mingw32/lib/../lib/:/mnt/nfs/source/Programs/MinGW/mingw-w64/experimental/buildsystem/build/root/mingw/lib/x86_64-w64-mingw32/4.8.0/:/mnt/nfs/source/Programs/MinGW/mingw-w64/experimental/buildsystem/build/root/mingw/lib/../lib/:/mnt/nfs/source/Programs/MinGW/mingw-w64/experimental/buildsystem/build/root/lib/gcc/x86_64-w64-mingw32/4.8.0/../../../../x86_64-w64-mingw32/lib/:/mnt/nfs/source/Programs/MinGW/mingw-w64/experimental/buildsystem/build/root/mingw/lib/