configure: improve pthread_sigmask detection.

On Windows system, pthread_sigmask is defined as a noop which will
trigger unused variable warning for sigmask.
By triggering the same warning in the configure script, we make
CONFIG_PTHREAD_SIGMASK undefined in the Windows msys2 build.

Signed-off-by: Shai Levy <shailevy23@gmail.com>.

1 files changed, 2 insertions, 1 deletions

diff --git a/configure b/configure
index 36184a58a..742cb7c53 100755
--- a/configure
+++ b/configure
@@ -864,7 +864,8 @@ cat > $TMPC <<EOF
 #include <signal.h> /* pthread_sigmask() */
 int main(void)
 {
-  return pthread_sigmask(0, NULL, NULL);
+  sigset_t sigmask;
+  return pthread_sigmask(0, NULL, &sigmask);
 }
 EOF
 if compile_prog "" "$LIBS" "pthread_sigmask" ; then