[Mingw-cross-env-list] g++ 4.5.2 is pulling system headers from the wrong place

[René Berber]

Hi,

I just found this, the new g++ 4.5.2 fails where the old 4.4.0 was doing
it right.

The problem is obvious, 4.5.2 is including header /usr/include/wchar.h
which is the wrong one, and the problem is the version, nothing else.  I
haven't found the problem in the build, but that is the only suspect,
could be a bug introduced upstream (I haven't looked into bug reports
for this version).

Tested the exact same compile command with 4.4.0 and everything works
(sorry for the size):

$ i686-pc-mingw32-g++ --version
i686-pc-mingw32-g++ (GCC) 4.5.2
...
$ i686-pc-mingw32-g++ -c -pipe -O2
-I/home/rberber/mingw/usr/i686-pc-mingw32/include
-I/home/rberber/mingw/usr/i686-pc-mingw32/include
-I/home/rberber/mingw/usr/i686-pc-mingw32/include
-I/home/rberber/mingw/usr/i686-pc-mingw32/include/dbus-1.0
-I/home/rberber/mingw/usr/i686-pc-mingw32/lib/dbus-1.0/include -frtti
-fexceptions -mthreads -Wall -DUNICODE -DQT_LARGEFILE_SUPPORT -DQT_DBUS
-DQT_THREAD_SUPPORT -DQT_NO_DEBUG -DQT_GUI_LIB -DQT_NETWORK_LIB
-DQT_CORE_LIB -I'../../usr/i686-pc-mingw32/include/QtCore'
-I'../../usr/i686-pc-mingw32/include/QtNetwork'
-I'../../usr/i686-pc-mingw32/include/QtGui'
-I'../../usr/i686-pc-mingw32/include'
-I'../../usr/i686-pc-mingw32/include/QtDBus' -I'/usr/include' -I'..'
-I'release' -I'../../usr/i686-pc-mingw32/include/ActiveQt' -I'.'
-I'../../usr/i686-pc-mingw32/mkspecs/unsupported/win32-g++-cross' -o
release/about.o about.cc
In file included from
/export/home/rberber/mingw-cross-env/usr/bin/../lib/gcc/i686-pc-mingw32/4.5.2/include/c++/cwchar:47:0,
                 from
/export/home/rberber/mingw-cross-env/usr/bin/../lib/gcc/i686-pc-mingw32/4.5.2/include/c++/bits/postypes.h:42,
                 from
/export/home/rberber/mingw-cross-env/usr/bin/../lib/gcc/i686-pc-mingw32/4.5.2/include/c++/bits/char_traits.h:42,
                 from
/export/home/rberber/mingw-cross-env/usr/bin/../lib/gcc/i686-pc-mingw32/4.5.2/include/c++/string:42,
                 from
/export/home/rberber/mingw-cross-env/usr/bin/../lib/gcc/i686-pc-mingw32/4.5.2/../../../../i686-pc-mingw32/include/QtCore/qstring.h:60,
                 from
/export/home/rberber/mingw-cross-env/usr/bin/../lib/gcc/i686-pc-mingw32/4.5.2/../../../../i686-pc-mingw32/include/QtCore/qobject.h:48,
                 from
/export/home/rberber/mingw-cross-env/usr/bin/../lib/gcc/i686-pc-mingw32/4.5.2/../../../../i686-pc-mingw32/include/QtGui/qwidget.h:46,
                 from
../../usr/i686-pc-mingw32/include/QtGui/qdialogbuttonbox.h:45,
                 from
../../usr/i686-pc-mingw32/include/QtGui/QDialogButtonBox:1,
                 from about.cc:13:
/usr/include/wchar.h:718:6: error: expected initializer before 'throw'
...

$ ~/mingw-cross-env-2.12/usr/bin/i686-pc-mingw32-g++ --version
i686-pc-mingw32-g++ (GCC) 4.4.0
...
$ ~/mingw-cross-env-2.12/usr/bin/i686-pc-mingw32-g++ -c -pipe -O2
-I/home/rberber/mingw/usr/i686-pc-mingw32/include
-I/home/rberber/mingw/usr/i686-pc-mingw32/include
-I/home/rberber/mingw/usr/i686-pc-mingw32/include
-I/home/rberber/mingw/usr/i686-pc-mingw32/include/dbus-1.0
-I/home/rberber/mingw/usr/i686-pc-mingw32/lib/dbus-1.0/include -frtti
-fexceptions -mthreads -Wall -DUNICODE -DQT_LARGEFILE_SUPPORT -DQT_DBUS
-DQT_THREAD_SUPPORT -DQT_NO_DEBUG -DQT_GUI_LIB -DQT_NETWORK_LIB
-DQT_CORE_LIB -I'../../usr/i686-pc-mingw32/include/QtCore'
-I'../../usr/i686-pc-mingw32/include/QtNetwork'
-I'../../usr/i686-pc-mingw32/include/QtGui'
-I'../../usr/i686-pc-mingw32/include'
-I'../../usr/i686-pc-mingw32/include/QtDBus' -I'/usr/include' -I'..'
-I'release' -I'../../usr/i686-pc-mingw32/include/ActiveQt' -I'.'
-I'../../usr/i686-pc-mingw32/mkspecs/unsupported/win32-g++-cross' -o
release/about.o about.cc
$
-- 
René Berber