Reviewed GLFW compilation requirements on Linux: `_GNU_SOURCE`

Reasons to NOT define `_GNU_SOURCE`:

 - access to lots of nonstandard GNU/Linux extension functions
 - access to traditional functions which were omitted from the POSIX standard (often for good reason, such as being replaced with better alternatives, or being tied to particular legacy implementations)
 - access to low-level functions that cannot be portable, but that you sometimes need for implementing system utilities like mount, ifconfig, etc.
 - broken behavior for lots of POSIX-specified functions, where the GNU folks disagreed with the standards committee on how the functions should behave and decided to do their own thing.

2 files changed, 0 insertions, 2 deletions

diff --git a/src/external/glfw/src/posix_poll.c b/src/external/glfw/src/posix_poll.c
index d309292e..676a8a51 100644
--- a/src/external/glfw/src/posix_poll.c
+++ b/src/external/glfw/src/posix_poll.c
@@ -29,7 +29,6 @@
 #define _GNU_SOURCE
 
 #include "internal.h"
-#include "posix_poll.h"     // @raysan5: Required for poll(), ppoll()
 
 #include <signal.h>
 #include <time.h>
diff --git a/src/external/glfw/src/posix_poll.h b/src/external/glfw/src/posix_poll.h
index 860f108d..1effd1cd 100644
--- a/src/external/glfw/src/posix_poll.h
+++ b/src/external/glfw/src/posix_poll.h
@@ -26,7 +26,6 @@
 // It is fine to use C99 in this file because it will not be built with VS
 //========================================================================
 
-#define _GNU_SOURCE     // @raysan5: Required for ppoll()
 #include <poll.h>
 
 GLFWbool _glfwPollPOSIX(struct pollfd* fds, nfds_t count, double* timeout);