Merge pull request libgit2#4334 from pks-t/pks/reproducible-builds

Reproducible builds

Author: ethomson

CMakeLists.txt

@@ -50,6 +50,9 @@ OPTION( CURL			"Use curl for HTTP if available" ON)
 OPTION( USE_EXT_HTTP_PARSER		"Use system HTTP_Parser if available" ON)
 OPTION( DEBUG_POOL			"Enable debug pool allocator"			OFF )
 OPTION( ENABLE_WERROR			"Enable compilation with -Werror"		OFF )
+IF (UNIX AND NOT APPLE)
+	OPTION( ENABLE_REPRODUCIBLE_BUILDS	"Enable reproducible builds" 			OFF )
+ENDIF()
 
 IF(${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
 	SET( USE_ICONV ON )
@@ -222,6 +225,12 @@ IF (MSVC)
 	SET(CMAKE_SHARED_LINKER_FLAGS_RELWITHDEBINFO "${CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO}")
 	SET(CMAKE_SHARED_LINKER_FLAGS_MINSIZEREL "${CMAKE_EXE_LINKER_FLAGS_MINSIZEREL}")
 ELSE ()
+	IF (ENABLE_REPRODUCIBLE_BUILDS)
+		SET(CMAKE_C_ARCHIVE_CREATE "<CMAKE_AR> Dqc <TARGET> <LINK_FLAGS> <OBJECTS>")
+		SET(CMAKE_C_ARCHIVE_APPEND "<CMAKE_AR> Dq  <TARGET> <LINK_FLAGS> <OBJECTS>")
+		SET(CMAKE_C_ARCHIVE_FINISH "<CMAKE_RANLIB> -D <TARGET>")
+	ENDIF()
+
 	SET(CMAKE_C_FLAGS "-D_GNU_SOURCE ${CMAKE_C_FLAGS}")
 
 	MACRO(ENABLE_WARNINGS flag)

tests/generate.py

@@ -207,16 +207,18 @@ def write(self):
             return False
 
         with open(output, 'w') as data:
-            for module in self.modules.values():
+            modules = sorted(self.modules.values(), key=lambda module: module.name)
+
+            for module in modules:
                 t = Module.DeclarationTemplate(module)
                 data.write(t.render())
 
-            for module in self.modules.values():
+            for module in modules:
                 t = Module.CallbacksTemplate(module)
                 data.write(t.render())
 
             suites = "static struct clar_suite _clar_suites[] = {" + ','.join(
-                Module.InfoTemplate(module).render() for module in sorted(self.modules.values(), key=lambda module: module.name)
+                Module.InfoTemplate(module).render() for module in modules
             ) + "\n};\n"
 
             data.write(suites)