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Subject: Re: i686 ld couldn't resolve wglCreateContext from libopengl32.a on x86_64 system
To: cygwin@cygwin.com
References: <1488493020.688562858@f125.i.mail.ru>
From: Yaakov Selkowitz <yselkowitz@cygwin.com>
Message-ID: <067a7ff0-8b44-02c3-b452-179df9fe75eb@cygwin.com>
Date: Thu, 2 Mar 2017 16:54:33 -0600
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On 2017-03-02 16:17, sorryforaskingthis.bk.ru via cygwin wrote:
> $ gcc -o /tmp/conftest.exe /tmp/conftest.c -lopengl32
> /tmp/ccec30zH.o:conftest.c:(.text+0xc): undefined reference to `wglCreateContext'
>
> conftest.c:
>
> #ifdef __cplusplus
> extern "C"
> #endif
> char wglCreateContext ();
> int
> main ()
> {
> return wglCreateContext ();
>   ;
>   return 0;
> }

This looks like a snippet of an autoconf AC_CHECK_LIB (or 
AC_CHECK_FUNCTION) test.  Such tests don't work with 32-bit Win32 APIs 
-- on either Cygwin or MinGW -- because they don't take stdcall into 
account.  You'll need to modify the test to work around that.

Also, if you're using Cygwin, do you *really* want to be using Win32 
OpenGL and not X11?

-- 
Yaakov

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