cmake (CheckPTHREAD): remove _GNU_SOURCE define after bug #7026 fix
diff --git a/cmake/sdlchecks.cmake b/cmake/sdlchecks.cmake
index fe31ead..f3f0849 100644
--- a/cmake/sdlchecks.cmake
+++ b/cmake/sdlchecks.cmake
@@ -966,7 +966,6 @@ macro(CheckPTHREAD)
list(APPEND SDL_CFLAGS ${PTHREAD_CFLAGS})
check_c_source_compiles("
- #define _GNU_SOURCE 1
#include <pthread.h>
int main(int argc, char **argv) {
pthread_mutexattr_t attr;
@@ -977,7 +976,6 @@ macro(CheckPTHREAD)
set(SDL_THREAD_PTHREAD_RECURSIVE_MUTEX 1)
else()
check_c_source_compiles("
- #define _GNU_SOURCE 1
#include <pthread.h>
int main(int argc, char **argv) {
pthread_mutexattr_t attr;
@@ -1008,7 +1006,6 @@ macro(CheckPTHREAD)
check_include_files("pthread_np.h" HAVE_PTHREAD_NP_H)
if (HAVE_PTHREAD_H)
check_c_source_compiles("
- #define _GNU_SOURCE 1
#include <pthread.h>
int main(int argc, char **argv) {
pthread_setname_np(pthread_self(), \"\");