i686 ld couldn't resolve wglCreateContext from libopengl32.a on x86_64 system

i686 ld couldn't resolve wglCreateContext from libopengl32.a on x86_64 system

[sorryforaskingthis.bk.ru via cygwin]

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I've done fresh install of cygwin with setup-x86.exe @ Win10 LTSB 2015 x64.

I've installed gcc-core and w32api-runtime packages.

opengl32.dll in System32 folder is 32-bit dll

With x86_64 install of cygwin ld able to find reference to wglCreateContext, with x86 - not.

$ 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;
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Re: i686 ld couldn't resolve wglCreateContext from libopengl32.a on x86_64 system

[Yaakov Selkowitz]

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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Re: i686 ld couldn't resolve wglCreateContext from libopengl32.a on x86_64 system

[Andrey Repin]

Greetings, sorryforaskingthis.bk.ru via cygwin!

> Yes, I need to use Win32.
> also want to save performance as much as possible.

Choose one or another.
In my experience, 32-bit apps perform worse on 64-bit host than native apps.


-- 
With best regards,
Andrey Repin
Friday, March 3, 2017 16:45:20

Sorry for my terrible english...


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Re: i686 ld couldn't resolve wglCreateContext from libopengl32.a on x86_64 system

[Michael Enright]

On Thu, Mar 2, 2017 at 5:19 PM, Yaakov Selkowitz wrote:
>
> Maybe, maybe not.  Mixing *NIX and Win32 APIs isn't so simple.
>

I have some small projects that do this mixing. A determined
individual can do it. I have not done it with 'wgl'

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Re: i686 ld couldn't resolve wglCreateContext from libopengl32.a on x86_64 system

[Yaakov Selkowitz]

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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Re: i686 ld couldn't resolve wglCreateContext from libopengl32.a on x86_64 system

[sorryforaskingthis.bk.ru via cygwin]

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>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.
And I don't understand why you're say that it is related to stdcall, while wglCreateContext exposed directly without any @0 @4 etc. With --enable-stdcall-fixup ld says: undefined reference to `wglCreateContext@0'

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.

I think if w32api-runtime package is provided it supposed to work.\x03B‹KCB”\x1c›Ø›\x19[H\x1c™\^[ܝ\x1cΈ\b\b\b\b\b\b\x1a\x1d\x1d\x1c\x0e‹ËØÞYÝÚ[‹˜ÛÛKÜ\x1c›Ø›\x19[\Ëš\x1d^[[\x03B‘TNˆ\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\x1a\x1d\x1d\x1c\x0e‹ËØÞYÝÚ[‹˜ÛÛKÙ˜\KÃB‘^[ØÝ[Y[\x18]\x1a[ÛŽˆ\b\b\b\b\b\b\b\b\x1a\x1d\x1d\x1c\x0e‹ËØÞYÝÚ[‹˜ÛÛKÙ^[ØÜËš\x1d^[[\x03B•[œÝXœØÜšX™H\x1a[™›Îˆ\b\b\b\b\b\x1a\x1d\x1d\x1c\x0e‹ËØÞYÝÚ[‹˜ÛÛKÛ[\vÈÝ[œÝXœØÜšX™K\Ú[\^[\x19CBƒB