[Bug c/56280] GCC builded for MinGW32(-w64) contains malformed directory in include search path

[k2k at narod dot ru]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56280

--- Comment #1 from Karlson2k <k2k at narod dot ru> 2013-02-11 00:29:26 UTC ---
With simple patch:
--- ./gcc/cppdefault.c.orig     2013-02-11 01:50:57 +0400
+++ ./gcc/cppdefault.c  2013-02-11 03:54:00 +0400
@@ -63,7 +63,7 @@ const struct default_include cpp_include
 #endif
 #ifdef LOCAL_INCLUDE_DIR
     /* /usr/local/include comes before the fixincluded header files.  */
-    { LOCAL_INCLUDE_DIR, 0, 0, 1, 1, 0 },
+    { LOCAL_INCLUDE_DIR, 0, 0, 1, 0, 0 },
 #endif
 #ifdef PREFIX_INCLUDE_DIR
     { PREFIX_INCLUDE_DIR, 0, 0, 1, 0, 0 },

problem is fixed.
Test run with patch:

$ echo int main(){return 1;} | i686-w64-mingw32-gcc.exe -v -E -x c -
Using built-in specs.
COLLECT_GCC=i686-w64-mingw32-gcc.exe
Target: i686-w64-mingw32
Configured with: ../../source/gcc-4.7.2/configure --build=i686-pc-mingw32
--host=i686-pc-mingw32 --target=i686-w64-mingw32 --disable-nls
--disable-multilib --prefix=/home/UserName/mingw-w64/mingw-w64-i686
--with-sysroot=/home/UserName/mingw-w64/mingw-w64-i686
--with-native-system-header-dir=/i686-w64-mingw32/include
--with-host-libstdcxx=/mingw/lib/gcc/mingw32/4.7.2/libstdc++.a
--disable-cloog-version-check --disable-ppl-version-check
--with-mpc=/home/UserName/mingw-w64/packages/gcc/packages/mpc/mpc-1.0.1-i686
--with-mpfr=/home/UserName/mingw-w64/packages/gcc/packages/mpfr/mpfr-3.1.1-i686
--with-gmp=/home/UserName/mingw-w64/packages/gcc/packages/gmp/gmp-5.1.0-i686
--with-ppl=/home/UserName/mingw-w64/packages/gcc/packages/ppl/ppl-1.0-i686
--with-cloog=/home/UserName/mingw-w64/packages/gcc/packages/cloog-ppl/cloog-ppl-0.15.11-i686
--enable-languages=c,c++ --enable-threads=win32 --enable-fully-dynamic-string
--disable-sjlj-exceptions --with-multilib-list=m32 --with-arch=pentium3
--enable-leading-mingw64-underscores --with-dwarf2 --enable-lto
--disable-win32-registry --with-win32-nlsapi=unicode --enable-libstdcxx-debug
Thread model: win32
gcc version 4.7.2 (GCC)
COLLECT_GCC_OPTIONS='-v' '-E' '-mtune=generic' '-march=pentium3'

t:/mingw32/msys/1.0/home/username/mingw-w64/mingw-w64-i686/bin/../libexec/gcc/i686-w64-mingw32/4.7.2/cc1.exe
-E -quiet -v -iprefix
t:\mingw32\msys\1.0\home\username\mingw-w64\mingw-w64-i686\bin\../lib/gcc/i686-w64-mingw32/4.7.2/
-isysroot
t:\mingw32\msys\1.0\home\username\mingw-w64\mingw-w64-i686\bin\../../mingw-w64-i686
-U_REENTRANT - -mtune=generic -march=pentium3
ignoring duplicate directory
"T:/MinGW32/msys/1.0/home/UserName/mingw-w64/mingw-w64-i686/lib/gcc/../../lib/gcc/i686-w64-mingw32/4.7.2/include"
ignoring duplicate directory
"t:/mingw32/msys/1.0/home/username/mingw-w64/mingw-w64-i686/lib/gcc/../../lib/gcc/i686-w64-mingw32/4.7.2/../../../../include"
ignoring duplicate directory
"T:/MinGW32/msys/1.0/home/UserName/mingw-w64/mingw-w64-i686/lib/gcc/../../lib/gcc/i686-w64-mingw32/4.7.2/include-fixed"
ignoring duplicate directory
"T:/MinGW32/msys/1.0/home/UserName/mingw-w64/mingw-w64-i686/lib/gcc/../../lib/gcc/i686-w64-mingw32/4.7.2/../../../../i686-w64-mingw32/include"
ignoring nonexistent directory
"t:\mingw32\msys\1.0\home\username\mingw-w64\mingw-w64-i686\bin\../../mingw-w64-i686/mingw/include"
#include "..." search starts here:
#include <...> search starts here:

t:\mingw32\msys\1.0\home\username\mingw-w64\mingw-w64-i686\bin\../lib/gcc/i686-w64-mingw32/4.7.2/include

t:\mingw32\msys\1.0\home\username\mingw-w64\mingw-w64-i686\bin\../lib/gcc/i686-w64-mingw32/4.7.2/../../../../include

t:\mingw32\msys\1.0\home\username\mingw-w64\mingw-w64-i686\bin\../lib/gcc/i686-w64-mingw32/4.7.2/include-fixed

t:\mingw32\msys\1.0\home\username\mingw-w64\mingw-w64-i686\bin\../lib/gcc/i686-w64-mingw32/4.7.2/../../../../i686-w64-mingw32/include
End of search list.
# 1 "<stdin>"
# 1 "<command-line>"
# 1 "<stdin>"
int main(){return 1;}
COMPILER_PATH=t:/mingw32/msys/1.0/home/username/mingw-w64/mingw-w64-i686/bin/../libexec/gcc/i686-w64-mingw32/4.7.2/;t:/mingw32/msys/1.0/home/username/mingw-w64/mingw-w64-i686/bin/../libexec/gcc/;t:/mingw32/msys/1.0/home/username/mingw-w64/mingw-w64-i686/bin/../lib/gcc/i686-w64-mingw32/4.7.2/../../../../i686-w64-mingw32/bin/
LIBRARY_PATH=t:/mingw32/msys/1.0/home/username/mingw-w64/mingw-w64-i686/bin/../lib/gcc/i686-w64-mingw32/4.7.2/;t:/mingw32/msys/1.0/home/username/mingw-w64/mingw-w64-i686/bin/../lib/gcc/;t:/mingw32/msys/1.0/home/username/mingw-w64/mingw-w64-i686/bin/../lib/gcc/i686-w64-mingw32/4.7.2/../../../../i686-w64-mingw32/lib/../lib/;t:/mingw32/msys/1.0/home/username/mingw-w64/mingw-w64-i686/bin/../lib/gcc/i686-w64-mingw32/4.7.2/../../../../i686-w64-mingw32/lib/
COLLECT_GCC_OPTIONS='-v' '-E' '-mtune=generic' '-march=pentium3'