Hi all.
I have built GCC from gcc-6-branch in MSYS2 with mingw-w64 CRT on Windows today.
Now I have a relocation problem:
Assuming mingw-w64 headers are located in the follow directory,which is, the
native_system_header_dir:
> C:/MinGW/MSYS2/mingw32/lib/gcc/i686-w64-mingw32/6.1.1/include
I have built GCC and it has that hard-coded path.
When I compile something using g++ -v, the headers are searched in the
following paths:
```
ignoring nonexistent directory "/mingw32/include"
ignoring duplicate directory "C:/MinGW/MSYS2/mingw32/i686-w64-mingw32/include"
#include "..." search starts here:
#include <...> search starts here:
C:/MinGW/MSYS2/mingw32/include/c++/6.1.1
C:/MinGW/MSYS2/mingw32/include/c++/6.1.1/i686-w64-mingw32
C:/MinGW/MSYS2/mingw32/include/c++/6.1.1/backward
C:/MinGW/MSYS2/mingw32/lib/gcc/i686-w64-mingw32/6.1.1/include
C:/MinGW/MSYS2/mingw32/lib/gcc/i686-w64-mingw32/6.1.1/../../../../include
C:/MinGW/MSYS2/mingw32/lib/gcc/i686-w64-mingw32/6.1.1/include-fixed
C:/MinGW/MSYS2/mingw32/lib/gcc/i686-w64-mingw32/6.1.1/../../../../i686-w64-mingw32/include
End of search list.
```
The C++ headers are searched before any mingw-w64 headers, which is just fine.
However, if I move gcc to another directory, let's say,
C:/this_is_a_new_directory/mingw32/,
then re-compile the same program with g++ -v, the headers are searched in the
following paths:
```
ignoring duplicate directory
"C:/this_is_a_new_directory/mingw32/lib/gcc/../../lib/gcc/i686-w64-mingw32/6.1.1/include"
ignoring nonexistent directory "C:/MinGW/MSYS2/mingw32/include"
ignoring nonexistent directory "/mingw32/include"
ignoring duplicate directory
"C:/this_is_a_new_directory/mingw32/lib/gcc/../../lib/gcc/i686-w64-mingw32/6.1.1/include-fixed"
ignoring duplicate directory
"C:/this_is_a_new_directory/mingw32/lib/gcc/../../lib/gcc/i686-w64-mingw32/6.1.1/../../../../i686-w64-mingw32/include"
ignoring nonexistent directory "C:/MinGW/MSYS2/mingw32/i686-w64-mingw32/include"
#include "..." search starts here:
#include <...> search starts here:
C:/this_is_a_new_directory/mingw32/bin/../lib/gcc/i686-w64-mingw32/6.1.1/include
C:/this_is_a_new_directory/mingw32/bin/../lib/gcc/i686-w64-mingw32/6.1.1/../../../../include
C:/this_is_a_new_directory/mingw32/bin/../lib/gcc/i686-w64-mingw32/6.1.1/include-fixed
C:/this_is_a_new_directory/mingw32/bin/../lib/gcc/i686-w64-mingw32/6.1.1/../../../../i686-w64-mingw32/include
C:/this_is_a_new_directory/mingw32/lib/gcc/../../include/c++/6.1.1
C:/this_is_a_new_directory/mingw32/lib/gcc/../../include/c++/6.1.1/i686-w64-mingw32
C:/this_is_a_new_directory/mingw32/lib/gcc/../../include/c++/6.1.1/backward
End of search list.
```
This time the C++ headers are searched after mingw-w64 headers, which causes
the following error:
```
In file included from
C:/MinGW/mingw32/include/c++/6.1.1/ext/string_conversions.h:41:0,
from
C:/MinGW/mingw32/include/c++/6.1.1/bits/basic_string.h:5402,
from C:/MinGW/mingw32/include/c++/6.1.1/string:52,
from
C:/MinGW/mingw32/include/c++/6.1.1/bits/locale_classes.h:40,
from C:/MinGW/mingw32/include/c++/6.1.1/bits/ios_base.h:41,
from C:/MinGW/mingw32/include/c++/6.1.1/ios:42,
from C:/MinGW/mingw32/include/c++/6.1.1/ostream:38,
from C:/MinGW/mingw32/include/c++/6.1.1/iostream:39,
from test.cpp:1:
C:/MinGW/mingw32/include/c++/6.1.1/cstdlib:75:25: fatal error: stdlib.h: No
such file or directory
#include_next <stdlib.h>
^
compilation terminated.
```
Do you know how to solve this problem (modifications to gcc source code are
expected)?
Thanks in advance.
--------------
Best regards,
lh_mouse
2016-04-28
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