Applied cmake SOURCE_DATE_EPOCH patch for reproducible builds.

src/CMakeLists.txt

@@ -556,6 +556,13 @@ set(SRC_DRIVERS_SDL
 
 set(SOURCES ${SRC_CORE} ${SRC_DRIVERS_COMMON} ${SRC_DRIVERS_SDL})
 
+# Put build timestamp into BUILD_TS environment variable and from there into
+# the FCEUX_BUILD_TIMESTAMP preprocessor definition.
+# Note: with CMake >= 3.8.0, this will respect SOURCE_DATE_EPOCH. For more info,
+#       see <https://reproducible-builds.org/docs/source-date-epoch/>.
+string(TIMESTAMP BUILD_TS "%H:%M:%S  %b %d %Y")
+add_definitions( -DFCEUX_BUILD_TIMESTAMP=\"${BUILD_TS}\" )
+
 if (WIN32)
 add_custom_command( 
 	OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/fceux_git_info.cpp  

src/config.cpp

@@ -13,6 +13,10 @@
 
 static char *aboutString = 0;
 
+#ifndef FCEUX_BUILD_TIMESTAMP
+#define FCEUX_BUILD_TIMESTAMP  __TIME__ " " __DATE__
+#endif
+
 // returns a string suitable for use in an aboutbox
 const char *FCEUI_GetAboutString(void) 
 {
@@ -48,7 +52,8 @@ const char *FCEUI_GetAboutString(void)
 		"of NES emulation. In Memoriam --\n"
 		"ugetab\n"
 		"\n"
-		__TIME__ " " __DATE__ "\n";
+		"\n"
+		FCEUX_BUILD_TIMESTAMP "\n";
 
 	if (aboutString) return aboutString;