Cmake Set Compiler Flags

You have to remember to manually update cmake cxx flags on ci and on every locale development machine.

Cmake set compiler flags. Such compile flags are added even if the compiler supports the particular feature without the flag. While this approach definitely works it has a couple of problems. The compile flags property managed as a string sets additional compiler flags used to build source files. 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.

Part2 main cpp cmakelists txt main cpp will not be changed from part 1 but we ll be tweaking cmakelists txt. Contents of compile flags may use generator expressions with the syntax see the cmake generator expressions 7 manual for. The exact compile flags and language standard are deliberately not part of the user interface for this use case. 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.

Cmake can set compiler flags that encompass three broad scopes. This way targets that depend on first will automagically be built with c 11 flags. For example to compile on linux with o3 and with debug symbols do this. 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.

In the spirit of using modern cmake i am using the target compile options function to set the flags for my targets. 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. Cmake will compute the appropriate compile flags to use by considering the features specified for each target. How do i list the defined make targets from the command line.

Use compile definitions to pass additional preprocessor definitions. Cmake per language option flags 21 february 2020. I occasionally forgot to do that implemented a feature pushed it to ci. Additionally starting with cmake 3 8 it s possible to do.

Additional flags to be added when compiling this source file. Joe chip may 26 18 at 18 12. Graphviz test graph dotty test graph see also generating dependency graphs with cmake and cmake graphviz output cleaner. We ve seen that we can figure out which compiler flags are being used through make verbose 1.

Compiler flags in this post we ll explore means of setting compiler flags. Target compile features first public cxx std 11 to set c standard. To specify a different optimization for the default build type relwithdebinfo set the cmake c flags relwithdebinfo and cmake cxx flags relwithdebinfo options. We can also use.

For makefile generator build environments you could use cmake exe build.