[Mesa-dev] [PATCH] configure.ac: Do not use Pthreads with MinGW.

[Jon TURNEY]

On 04/06/2014 01:06, Vinson Lee wrote:
> Match the behavior of the SCons MinGW build.
>
> This patch also fixes these build errors.
>
>    CC       glapi_entrypoint.lo
> glapi_entrypoint.c: In function 'init_glapi_relocs_once':
> glapi_entrypoint.c:341:4: error: unknown type name 'pthread_once_t'
>      static pthread_once_t once_control = PTHREAD_ONCE_INIT;
>      ^
> glapi_entrypoint.c:341:41: error: 'PTHREAD_ONCE_INIT' undeclared (first use in this function)
>      static pthread_once_t once_control = PTHREAD_ONCE_INIT;
>                                           ^
> glapi_entrypoint.c:341:41: note: each undeclared identifier is reported only once for each function it appears in
> glapi_entrypoint.c:342:4: error: implicit declaration of function 'pthread_once' [-Werror=implicit-function-declaration]
>      pthread_once( & once_control, init_glapi_relocs );
>      ^
>
> Signed-off-by: Vinson Lee <vlee at freedesktop.org>
> ---
>   configure.ac | 7 ++++++-
>   1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/configure.ac b/configure.ac
> index 9c64400..ab3b91d 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -552,7 +552,12 @@ dnl See if posix_memalign is available
>   AC_CHECK_FUNC([posix_memalign], [DEFINES="$DEFINES -DHAVE_POSIX_MEMALIGN"])
>
>   dnl Check for pthreads
> -AX_PTHREAD
> +case "$host_os" in
> +mingw*)
> +    ;;
> +*)
> +    AX_PTHREAD
> +esac
>   dnl AX_PTHREADS leaves PTHREAD_LIBS empty for gcc and sets PTHREAD_CFLAGS
>   dnl to -pthread, which causes problems if we need -lpthread to appear in
>   dnl pkgconfig files.

I'm not sure this is right.

Current versions of both the pthreads libraries for MinGW/MinGW64 
(pthreads-win32, winpthreads) seem to have pthread_once()

I guess maybe the actual issue is that there is some path here where 
pthread.h isn't included?