Hi all,
I am setting CMAKE_CXX_FLAGS to "-Wall -ansi -pedantic" but would like to
remove these flags for compilation
of UnitTest++. I tried three methods of doing this with some issue with each:
1. string (REPLACE "-Wall" "" CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS})
# And likewise for -ansi and -pedantic
2. set (CMAKE_CXX_FLAGS "")
3. unset (CMAKE_CXX_FLAGS CACHE)
I am doing the above for both CMAKE_CXX_FLAGS and CMAKE_C_FLAGS.
The problem with 1 and 2 is that they are not working. GCC (MinGW-W32) still
gives the concerned warnings. I do not get these warnings if I do not set
these flags at all to begin with.
Method 3 does work. The problem however is that it removes CMAKE_CXX_FLAGS
globally, not just from CMakeList.txt for UnitTest++. I could in principle
recreate CMAKE_CXX_FLAGS but would like to understand what's going on first.
Method 1 worked well for MSVC (using different flags than for GCC).
Here are all my files with relevant lines (shown only for CMAKE_CXX_FLAGS but
done also for CMAKE_C_FLAGS):
CXX_Flag_Overrides.cmake:
# ...
if (CMAKE_COMPILER_IS_GNUCXX)
# message ("CMAKE_COMPILER_IS_GNUCXX")
set(CMAKE_CXX_FLAGS_INIT "${CMAKE_CXX_FLAGS_INIT} -Wall -ansi
-pedantic")
endif()
# ...
CMakeLists.txt (top-level)
# ...
set(CMAKE_USER_MAKE_RULES_OVERRIDE_CXX
${CMAKE_CURRENT_SOURCE_DIR}/CXX_Flag_Overrides.cmake)
project (projectname)
# ...
add_subdirectory (UnitTest++)
# ...
CMakeLists.txt (UnitTest++)
# ...
if (CMAKE_COMPILER_IS_GNUCXX) #
http://www.cmake.org/cmake/help/cmake-2-8-docs.html#variable:CMAKE_COMPILER_IS_GNULANG
message ("CMAKE_COMPILER_IS_GNUCXX")
#string (REPLACE "-Wall" "" CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS})
#string (REPLACE "-ansi" "" CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS})
#string (REPLACE "-pedantic" "" CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS})
#unset (CMAKE_CXX_FLAGS CACHE)
set (CMAKE_CXX_FLAGS "")
message ("${CMAKE_CXX_FLAGS}")
endif()
# ...
add_library (UnitTest++ ${Sources})
Thanks,
Alok
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