Hmm. The idea for the “/MP” flags for those that don’t use Visual Studio is
that it will inform the compiler to use all the cores on the system to compile.
Much like Ninja does automatically and “make -jN” does for makefiles.
Essentially I want to automatically add the “/MP” flag anytime that I configure
using Visual Studio (2015/2017) as the generator. I guess I could put the
append string fairly high up in the CMake hierarchy. I am not seeing a property
(from the first link you sent) that would allow me to do that.
--
Michael Jackson | Owner, President
BlueQuartz Software
[e] [email protected]
[w] www.bluequartz.net
From: Marc CHEVRIER <[email protected]>
Date: Tuesday, September 11, 2018 at 1:04 PM
To: Michael Jackson <[email protected]>
Cc: CMake <[email protected]>
Subject: Re: [CMake] Appending to CMAKE_CXX_FLAGS
The best approach is to use properties (see
https://cmake.org/cmake/help/git-master/manual/cmake-properties.7.html).
At directory level and target level you can use property 'COMPILE_OPTIONS'.
These properties can be updated using, respectively 'add_compile_options' and
'target_compile_options'.
Be aware that variable 'CMAKE_CXX_FLAGS' is a string so to extend it you have
to use:
string(APPEND CMAKE_CXX_FLAGS "flag1 flag2")
Le mar. 11 sept. 2018 à 17:58, Michael Jackson <[email protected]> a
écrit :
What is the “modern” way to append to CMAKE_CXX_FLAGS? This is the logic that I
would like:
If (MSVC)
Set(CMAKE_CXX_FLAGS ${ CMAKE_CXX_FLAGS} “/MP”)
Endif()
I have always heard that appending to the compile flags in this way is “bad”.
What is the best practice for doing this?
Thanks
--
Michael Jackson | Owner, President
BlueQuartz Software
[e] [email protected]
[w] www.bluequartz.net
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