Mesa (master): configure.ac: Don't look for pthreads in Android platform

[Emil Velikov]

Module: Mesa
Branch: master
Commit: e23608db1cad3d3b86b5350255db4d47a0081d2e
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=e23608db1cad3d3b86b5350255db4d47a0081d2e

Author: Gurchetan Singh <gurchetansingh at chromium.org>
Date:   Thu Oct 27 09:06:42 2016 -0700

configure.ac: Don't look for pthreads in Android platform

In Android, the pthreads libs are in bionic.  When building
Mesa for Android with the autotools workflow, we shouldn't
set -lpthread or -pthread.

[Emil Velikov]
Other platforms could use a similar fix, although that is left as
separate exercise.

Reviewed-by: Emil Velikov <emil.velikov at collabora.com>

---

 configure.ac | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/configure.ac b/configure.ac
index 4761c59..3f21cd5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -823,8 +823,11 @@ if test "x$ax_pthread_ok" = xno; then
 fi
 dnl AX_PTHREADS leaves PTHREAD_LIBS empty for gcc and sets PTHREAD_CFLAGS
 dnl to -pthread, which causes problems if we need -lpthread to appear in
-dnl pkgconfig files.
-test -z "$PTHREAD_LIBS" && PTHREAD_LIBS="-lpthread"
+dnl pkgconfig files.  Since Android doesn't have a pthread lib, this check
+dnl is not valid for that platform.
+if test "x$android" = xno; then
+    test -z "$PTHREAD_LIBS" && PTHREAD_LIBS="-lpthread"
+fi
 
 dnl pthread-stubs is mandatory on targets where it exists
 case "$host_os" in