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cmake: add the GCC_OPTIMIZATION_FLAGS variable

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Instead of always adding -O2 for CMAKE_C_FLAGS_DEBUG and
CMAKE_CXX_FLAGS_DEBUG allow the user to pass a custom value
via GCC_OPTIMIZATION_FLAGS.

Passing -DGCC_OPTIMIZATION_FLAGS:STRING=-O0 would disable
all optimizations.

Suggested-by: Robert C. Helling <helling@atdotde.de>
Signed-off-by: Lubomir I. Ivanov <neolit123@gmail.com>
This commit is contained in:
Lubomir I. Ivanov 2018-04-28 22:28:22 +03:00
parent 81a812539c
commit a0b80ca775
1 changed files with 5 additions and 3 deletions
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8
CMakeLists.txt
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@ -105,9 +105,11 @@ endif()
set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall")
set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall")
# optimize -O2 even for debug builds
set (CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -O2")
set (CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -O2")
# by detault optimize with -O2 even for debug builds
set (GCC_OPTIMIZATION_FLAGS "-O2" CACHE STRING "GCC optimization flags")
message (STATUS "GCC optimization flags: " ${GCC_OPTIMIZATION_FLAGS})
set (CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} ${GCC_OPTIMIZATION_FLAGS}")
set (CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} ${GCC_OPTIMIZATION_FLAGS}")
# pkgconfig for required libraries
find_package(PkgConfig)