How to define macros from meson command line invocation ?

[frak0d]

How to define macros from meson command line invocation ? Is there something like meson --define:MY_MACRO=45 ?

[eli-schwartz]

If you're trying to pass macros to the C/C++ compiler, the project itself should probably be handling that via add_project_arguments().

You can add it yourself via c_args or cpp_args though, which take an array of user (not project) -specified compiler flags.

[frak0d]

I need to do it from command line. Not from meson.build

[eli-schwartz]

And I told you that this is possible via the command line's c_args option.

[WarrenWeckesser]

@eli-schwartz can you given an example of a command line invocation that uses cpp_args to define a macro? Not all of us have the meson command line API memorized!

[eli-schwartz]

CXXFLAGS="$CXXFLAGS -DMY_MACRO=45" meson setup builddir

meson setup builddir -Dcpp_args="$CXXFLAGS -DMY_MACRO=45"

[WarrenWeckesser]

Thanks!