[BUG ?] Failed to rebuild Cygwin

Corinna Vinschen corinna-cygwin@cygwin.com
Wed Jul 31 10:27:00 GMT 2013

On Jul 31 12:55, Pavel Fedin wrote:
>  Hello!
>  I have occasionally found a little problem in path check code. Attempt to
> reference thing like '/..' fails, however at least under Linux this resolves
> to root, and you can actually attempt to go past-root as many times as you
> want, e. g. '/../../../..'. The bug was occasionally revealed by 'make' test
> suite.
>  I wanted to fix it, but cannot rebuild Cygwin DLL. The build ends up in:
> --- cut ---
> x86_64-w64-mingw32-g++  -o strace.exe strace.o path.o -L/usr/lib/w32api
> -static -lntdll
> /usr/x86_64-w64-mingw32/sys-root/mingw/lib/../lib/crt2.o: In function
> `__tmainCRTStartup':
> /usr/src/debug/mingw64-x86_64-runtime-3.0b_svn5935-1/crt/crtexe.c:285:
> undefined reference to `_set_invalid_parameter_handler'
> /usr/x86_64-w64-mingw32/sys-root/mingw/lib/../lib/libmingwex.a(lib64_libming
> wex_a-mingw_pformat.o): In function `__pformat_exponent_digits':
> /usr/src/debug/mingw64-x86_64-runtime-3.0b_svn5935-1/stdio/mingw_pformat.c:1
> 76: undefined reference to `_get_output_format'
> collect2: error: ld returned 1 exit status
> Makefile:143: recipe for target `cygwin-console-helper.exe' failed
> make[3]: *** [cygwin-console-helper.exe] Error 1
> --- cut ---
>  Likely some MinGW CRT bug ?

This also occurs on Fedora right now.

AFAICS, the culprit is that the latest Cygwin w32api package doesn't
match the files from mingw-crt for some reason.

The build uses -L/usr/lib/w32api (-L/usr/i686-pc-cygwin/lib/w32api when
cross building on Fedora), so the libs are taken from the w32api-runtime
package.  However, the compiler uses the default crt file
/usr/i686-w64-mingw32/sys-root/mingw/lib/../lib/crt2.o which is provided
by the mingw-crt package.

This is a bug in Cygwin's Makefile since you should never use the w32api
stuff for mingw executables, only for Cygwin executables, but still...

JonY, do you have an idea why the mingw-crt differs that much from the
w32api stuff that the above error occurs?


Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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