Add a compat stdatomic.h implementation based on pthreads

Adapted from the code by Rémi Denis-Courmont from VLC

This merges libav commit f9a6a80e065cdb95b233978f1d96ec9bc863daa1.

Signed-off-by: Wan-Teh Chang <wtc@google.com>
Reviewed-by: wm4 <nfxjfg@googlemail.com>
Signed-off-by: James Almer <jamrial@gmail.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/configure b/configure
index dfe9bf881e..93df74503b 100755
--- a/configure
+++ b/configure
@@ -6388,6 +6388,9 @@ if disabled stdatomic_h; then
         add_cppflags '-I\$(SRC_PATH)/compat/atomics/win32'
     elif enabled atomics_suncc; then
         add_cppflags '-I\$(SRC_PATH)/compat/atomics/suncc'
+    elif enabled pthreads; then
+        add_compat atomics/pthread/stdatomic.o
+        add_cppflags '-I\$(SRC_PATH)/compat/atomics/pthread'
     fi
 fi