On 5/11/2010 9:52 AM, Alok Govil wrote:
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
You might consider using the target property COMPILE_FLAGS as a more
fine-grained way to control the flags, instead of the build-wide
variable. See the help for more info.
Ryan
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