All: Attempt to downgrade from GNU99 to C99

CMakeLists.txt

@@ -1,7 +1,7 @@
 cmake_minimum_required(VERSION 2.6)
 project(mGBA C)
 set(BINARY_NAME mgba CACHE INTERNAL "Name of output binaries")
-set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wextra -std=gnu99")
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wextra -std=c99")
 set(USE_CLI_DEBUGGER ON CACHE BOOL "Whether or not to enable the CLI-mode ARM debugger")
 set(USE_GDB_STUB ON CACHE BOOL "Whether or not to enable the GDB stub ARM debugger")
 set(USE_FFMPEG ON CACHE BOOL "Whether or not to enable FFmpeg support")
@@ -120,7 +120,8 @@ if(WIN32)
 	file(GLOB OS_SRC ${CMAKE_SOURCE_DIR}/src/platform/windows/*.c)
 	source_group("Windows-specific code" FILES ${OS_SRC})
 else()
-	add_definitions(-DUSE_PTHREADS)
+	add_definitions(-DUSE_PTHREADS -D_BSD_SOURCE -D_POSIX_SOURCE -D_POSIX_C_SOURCE=200809L)
+
 	if(NOT APPLE)
 		set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -pthread")
 	endif()

src/gba/hardware.c

@@ -7,8 +7,6 @@
 
 #include "gba/serialize.h"
 
-#include <time.h>
-
 static void _readPins(struct GBACartridgeHardware* hw);
 static void _outputPins(struct GBACartridgeHardware* hw, unsigned pins);
 

src/gba/hardware.h

@@ -10,6 +10,8 @@
 
 #include "macros.h"
 
+#include <time.h>
+
 #define IS_GPIO_REGISTER(reg) ((reg) == GPIO_REG_DATA || (reg) == GPIO_REG_DIRECTION || (reg) == GPIO_REG_CONTROL)
 
 struct GBARotationSource {