CMake: respect system cflags
Adding optimization level to CMAKE_C_FLAGS is intrusive and problematic
with policies of various distribution.
However, setting "-O2" in CMAKE_CFLAGS_RELEASE is fine and only
affects release build.
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 26fd972..2d35835 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -6,7 +6,8 @@
string(REGEX MATCH "clang" CMAKE_COMPILER_IS_CLANG "${CMAKE_C_COMPILER}")
if(CMAKE_COMPILER_IS_GNUCC)
- set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -O2 -Wall -Wextra -W -Wdeclaration-after-statement")
+ set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wextra -W -Wdeclaration-after-statement")
+ set(CMAKE_C_FLAGS_RELEASE "-O2")
set(CMAKE_C_FLAGS_DEBUG "-g3 -O0")
set(CMAKE_C_FLAGS_COVERAGE "-g3 -O0 --coverage")
set(CMAKE_C_FLAGS_ASAN "-fsanitize=address -fno-omit-frame-pointer -g3 -O1")
@@ -15,7 +16,8 @@
endif(CMAKE_COMPILER_IS_GNUCC)
if(CMAKE_COMPILER_IS_CLANG)
- set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -O2 -Wall -Wextra -W -Wdeclaration-after-statement")
+ set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wextra -W -Wdeclaration-after-statement")
+ set(CMAKE_C_FLAGS_RELEASE "-O2")
set(CMAKE_C_FLAGS_DEBUG "-g3 -O0")
set(CMAKE_C_FLAGS_COVERAGE "-g3 -O0 --coverage")
set(CMAKE_C_FLAGS_ASAN "-fsanitize=address -fno-omit-frame-pointer -g3 -O1")