Cmake Set Compiler Flags

Contents of compile flags may use generator expressions with the syntax see the cmake generator expressions 7 manual for. Cmake s default cmake cxx release flags overrides the user s cmake cxx flags it looks like the correct way to set optimization flags in cmake is to do it in the build type specific variables. Use compile definitions to pass additional preprocessor definitions.

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Such compile flags are added even if the compiler supports the particular feature without the flag.

Cmake set compiler flags.

The problem is i have not found a single modern cmake function that actually sets the flags all options that i have found seem to add the flags. As for the std flags like you said they come in the correct order so the user s choice is obeyed. For makefile generator build environments you could use cmake exe build. In the spirit of using modern cmake i am using the target compile options function to set the flags for my targets.

Target compile features first public cxx std 11 to set c standard. Just checked really quick and the more modern cmake approach of using. For example to compile on linux with o3 and with debug symbols do this. Cmake per language option flags 21 february 2020.

Compiler flags in this post we ll explore means of setting compiler flags. How do i list the defined make targets from the command line. Additionally starting with cmake 3 8 it s possible to do. In newer versions of cmake you can set compiler and linker flags for a single target with target compile options and target link libraries respectively yes the latter sets linker options too.

To specify a different optimization for the default build type relwithdebinfo set the cmake c flags relwithdebinfo and cmake cxx flags relwithdebinfo options. So i am working on a small cross platform project and i am trying to simply set compilation link flags and it is driving me nutz. This way targets that depend on first will automagically be built with c 11 flags. Target help and there is the graphical output solution example found here.

Cmake will compute the appropriate compile flags to use by considering the features specified for each target. The compile flags property managed as a string sets additional compiler flags used to build source files. Part2 main cpp cmakelists txt main cpp will not be changed from part 1 but we ll be tweaking cmakelists txt. Joe chip may 26 18 at 18 12.

We ll keep the structure of part 1. Graphviz test graph dotty test graph see also generating dependency graphs with cmake and cmake graphviz output cleaner. Cmake can set compiler flags that encompass three broad scopes. We ve seen that we can figure out which compiler flags are being used through make verbose 1.

We can also use. We set global and per language options near the beginning of the top level cmakelists txt before any targets are declared to avoid confusion about scope. Additional flags to be added when compiling this source file. The exact compile flags and language standard are deliberately not part of the user interface for this use case.