File mosquitto-1.4.12-use-SOURCE_DATE_EPOCH.patch of Package mosquitto

diff -up ./CMakeLists.txt.orig ./CMakeLists.txt
--- ./CMakeLists.txt.orig	2017-03-19 13:11:32.426142255 +0100
+++ ./CMakeLists.txt	2017-03-19 13:15:02.626150970 +0100
@@ -17,8 +17,13 @@ if (WIN32)
 	execute_process(COMMAND cmd /c echo %DATE% %TIME% OUTPUT_VARIABLE TIMESTAMP
 			OUTPUT_STRIP_TRAILING_WHITESPACE)
 else (WIN32)
-	execute_process(COMMAND date "+%F %T%z" OUTPUT_VARIABLE TIMESTAMP
+	if(DEFINED ENV{SOURCE_DATE_EPOCH})
+		execute_process(COMMAND date -d "@$ENV{SOURCE_DATE_EPOCH}" "+%F %T%z" OUTPUT_VARIABLE TIMESTAMP
 			OUTPUT_STRIP_TRAILING_WHITESPACE)
+	else()
+		execute_process(COMMAND date "+%F %T%z" OUTPUT_VARIABLE TIMESTAMP
+			OUTPUT_STRIP_TRAILING_WHITESPACE)
+	endif()
 endif (WIN32)
 
 add_definitions (-DCMAKE -DVERSION=\"${VERSION}\" -DTIMESTAMP=\"${TIMESTAMP}\")