Re: [Boost-testing] [mslater] mingw link failures

From: Beman Dawes (bdawes_at_[hidden])
Date: 2005-12-07 18:06:23

"Rene Rivera" <grafik.list_at_[hidden]> wrote in message 
news:439752EA.3080107_at_redshift-software.com...
> Beman Dawes wrote:
>> "Martin Slater" <mslater_at_[hidden]> wrote in message
>> news:438D9BEC.4040105_at_hellinc.net...
>>
>>>Eric Niebler wrote:
>>>
>>>>For the [mslater] mingw tests, xpressive is failing due to what looks to
>>>>be a configuration problem. See http://tinyurl.com/87dg9:
>>>>
>>>>c:/mingw/bin/../lib/gcc-lib/mingw32/3.2.3/../../../libmingw32.a(main.o)(.text+0x97):main.c:
>>>>undefined reference to `WinMain_at_16'
>>>>
>>>>FWIW, xpressive's tests pass for the Bronek mingw toolset.
>
>> The g++ command line is missing -L"c:/cygwin/lib/mingw", or whatever your
>> appropriate path is.
>>
>> The obvious workaround is to add an environmental variable:
>>
>>     set MINGW_STDLIB_DIRECTORY=c:\cygwin\lib\mingw
>>
>> That almost works, but also adds a spurious -L"" to the g++ command line. 
>> If
>> you remove the -L"" by hand, the g++ command then works OK.
>>
>> We need help from a Boost.Build expert:
>>
>> * Why does MINGW_STDLIB_DIRECTORY have to be set by hand?
>
> It's one of the standard MinGW config options for the toolset. But it
> would be preferable to set MINGW_ROOT_DIRECTORY, which will the cause
> the various GCC_*_DIRECTORY vars.

That doesn't work. The apparent mingw root directory cygwin installs just 
contains three symbolic links. (1) Windows doesn't understand cygwin 
symbolic links, and (2) they go to non-existant locations anyhow.

I guess I could fix them, and then run under bash, but that is pretty 
extreme. MINGW_STDLIB_DIRECTORY works, except for the extra -L""

>
>> Is the problem
>> that cygwin installs the mingw libraries in lib\mingw rather than lib?
>
> Don't know... Is the real installed toolset MinGW, or is it CYGWIN?

Cygwin.

Here is the command line that fails, after I've set MINGW_STDLIB_DIRECTORY:

    "g++" 
  "-Wl,--enable-auto-image-base"   -g -Wl,--allow-multiple-definition -mno-cygwin 
  -o 
"f:\filesystem-regr\bin\boost\libs\filesystem\test\large_file_support_test.test\mingw\debug\large_file_support_test.exe" 
  -L"f:/filesystem-regr/bin/boost/libs/filesystem/build/libboost_filesystem.lib/mingw/debug" 
  -L"c:/cygwin/lib/mingw" -L"" 
"f:\filesystem-regr\bin\boost\libs\filesystem\test\large_file_support_test.test\mingw\debug\large_file_support_test.obj" 
"f:\filesystem-regr\bin\boost\libs\filesystem\build\libboost_filesystem.lib\mingw\debug\libboost_filesystem-mgw-d-1_34.lib" 
"f:\filesystem-regr\bin\boost\libs\filesystem\build\libboost_filesystem.lib\mingw\debug\libboost_filesystem-mgw-d-1_34.lib"

The only thing wrong is the -L"". If I remove that, and run by hand, the 
link succeeds. Then the test also runs and passes.

Thanks,

--Beman