CMake performs deduplication of per-target flags for sure.
However I'm not sure if CMAKE_CXX_FLAGS is deduplicated. But I consider this
variable as global flags for the whole project which is defined at topmost
CMakeLists.txt. If you need to specify some flags specifically for a target use
target_compile_options.
—
Sent from Mailbox
On Mon, Oct 5, 2015 at 4:23 PM, Attila Krasznahorkay
<[email protected]> wrote:
> Dear All,
> Let me try a simpler question this time. (I'm a bit disappointed that nobody
> had any comments on my question about sub-projects.)
> I'm trying to clean up my project's build a bit. As it collects compilation
> flags from a few separate places, by the time it finishes collecting
> everything, the compilation commands are usually very long. As they have many
> duplications. Like:
> -m64 -pipe -W
> -Wall -Woverloaded-virtual -fsigned-char -fno-common -Qunused-arguments
> -pthread -std=c++11 -Wno-deprecated-declaration
> s -stdlib=libc++ -m64 -pipe -W -Wall -Woverloaded-virtual -fsigned-char
> -fno-common -Qunused-arguments -pthread -std=c++
> 11 -Wno-deprecated-declarations -stdlib=libc++ -Wno-unused-local-typedefs
> -Wno-tautological-undefined-compare -Wno-incon
> sistent-missing-override -m64 -pipe -W -Wall -Woverloaded-virtual
> -fsigned-char -fno-common -Qunused-arguments -pthread
> -std=c++11 -Wno-deprecated-declarations -stdlib=libc++ -m64 -pipe -W -Wall
> -Woverloaded-virtual -fsigned-char -fno-commo
> n -Qunused-arguments -pthread -std=c++11 -Wno-deprecated-declarations
> -stdlib=libc++ -m64 -pipe -W -Wall -Woverloaded-vi
> rtual -fsigned-char -fno-common -Qunused-arguments -pthread -std=c++11
> -Wno-deprecated-declarations -stdlib=libc++ -m64
> -pipe -W -Wall -Woverloaded-virtual -fsigned-char -fno-common
> -Qunused-arguments -pthread -std=c++11 -Wno-deprecated-dec
> larations -stdlib=libc++ -m64 -pipe -fsigned-char -fno-common
> -Qunused-arguments -pthread -std=c++11 -stdlib=libc++
> Naturally it would help the build log reading tremendously if I could remove
> the duplications from these lines. But I can't find a good way of doing it.
> How could I weed out all the duplications in the CXXFLAGS associated to a
> given target?
> Cheers,
> Attila
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