thodg/libgit2

2017-06-13T11:05:09

cmake: disable optimization on debug builds While our debug builds on MSVC platforms already tune the code optimizer to aid debugging code, all the other platforms still use the default optimization level. This makes it hard for developers on these platforms to actually debug code while maintaining his sanity due to optimizations like inlined code, elided variables etc. To help this common use case, we can simply follow the MSVC example and turn off code optimization with "-O0" for debug builds. While it would be preferable to instead use "-Og" supported by more modern compilers, we cannot guarantee that this level is available on all supported platforms.

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4ca6543..4783e3e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -478,7 +478,7 @@ ELSE ()
 		SET(CMAKE_C_FLAGS "-std=c99 -D_POSIX_C_SOURCE=200112L -D__EXTENSIONS__ -D_POSIX_PTHREAD_SEMANTICS ${CMAKE_C_FLAGS}")
 	ENDIF()
 
-	SET(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -D_DEBUG")
+	SET(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -D_DEBUG -O0")
 
 	IF (MINGW OR MSYS) # MinGW and MSYS always do PIC and complain if we tell them to
 		STRING(REGEX REPLACE "-fPIC" "" CMAKE_SHARED_LIBRARY_C_FLAGS "${CMAKE_SHARED_LIBRARY_C_FLAGS}")