Re: wglext.h

[Jon TURNEY <jon dot turney at dronecode dot org dot uk>]

On 31/10/2011 03:33, J. Offerman wrote:
> Okay, I went with --disable-aiglx, and it moved on, but I got this at
> the very last stage of the build process:
>
>
>    CCLD   XWin.exe
> ../../glx/.libs/libglx.a(glxcmds.o): In function `FlushContext':
> /usr/src/xorg-server-1.11.1-1/src/xserver-cygwin-1.11.1-1/glx/glxcmds.c:219:
> undefined reference to `__glapi_tls_Dispatch'
> ../../glx/.libs/libglx.a(glxcmds.o): In function `DoMakeCurrent':
> /usr/src/xorg-server-1.11.1-1/src/xserver-cygwin-1.11.1-1/glx/glxcmds.c:598:
> undefined reference to `__glapi_tls_Dispatch'
> ../../glx/.libs/libglx.a(glxcmds.o): In function `__glXDisp_WaitGL':
> /usr/src/xorg-server-1.11.1-1/src/xserver-cygwin-1.11.1-1/glx/glxcmds.c:767:
> undefined reference to `__glapi_tls_Dispatch'
> ../../glx/.libs/libglx.a(glxcmds.o): In function `__glXDisp_CopyContext':
> /usr/src/xorg-server-1.11.1-1/src/xserver-cygwin-1.11.1-1/glx/glxcmds.c:864:
> undefined reference to `__glapi_tls_Dispatch'
> ../../glx/.libs/libglx.a(glxcmds.o): In function `__glXDisp_SwapBuffers':
> /usr/src/xorg-server-1.11.1-1/src/xserver-cygwin-1.11.1-1/glx/glxcmds.c:1578:
> undefined reference to `__glapi_tls_Dispatch'
> ../../glx/.libs/libglx.a(glxcmds.o):/usr/src/xorg-server-1.11.1-1/src/xserver-cygwin-1.11.1-1/glx/glxcmds.c:1777:
> more undefined references to `__glapi_tls_Dispatch' follow
> collect2: ld returned 1 exit status
> make[4]: *** [XWin.exe] Error 1
>
>
> Who has "__glapi_tls_Dispatch"?

The short answer is ./configure with --disable-glx-tls

(In general I would suggest always looking at the .cygport file and checking 
you understand if you need to use the configuration options used there :-)

Slightly longer answer is because XWin links with mesa's libGL to provide the 
glapi functions (to avoid other problems which PE/COFF linkage causes us), 
XWin needs to be built with the same TLS-ness as libGL.  Since X server 1.10, 
X has changed from disabling TLS by default to autodetecting if TLS is 
available, but mesa doesn't build with TLS enabled on cygwin for reasons I 
never got around to looking into...

--
Jon TURNEY
Volunteer Cygwin/X X Server maintainer

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