i686 ld couldn't resolve wglCreateContext from libopengl32.a on x86_64 system
Yaakov Selkowitz
yselkowitz@cygwin.com
Fri Mar 3 01:19:00 GMT 2017
On 2017-03-02 18:14, sorryforaskingthis.bk.ru via cygwin wrote:
>> On 2017-03-02 16:54, Yaakov Selkowitz <yselkowitz@cygwin.com> wrote:
>>
>> 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?
>>
> Yes, you're right. It's autoconf test and it perfectly passed at 64-bit MinGW
> and 64-bit Cygwin, but not on 32-bit Cygwin.
It would fail on 32-bit MinGW too.
> And I don't understand why you're say that it is related to stdcall, while
> wglCreateContext exposed directly without any @0 @4 etc.
No, it's not, check the implib yourself. You have to use a proper
declaration to link stdcall functions, and the autoconf tests don't do
that. You need to change the test to avoid this; exactly how depends on
the intent of the test.
> Yes, I need to use Win32.
^^^^
> I want to port application that heavily POSIX-dependent, but also want to save
^^^^
> performance as much as possible.
Big difference.
> I think if w32api-runtime package is provided it supposed to work.
Maybe, maybe not. Mixing *NIX and Win32 APIs isn't so simple.
--
Yaakov
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