CODEWITHSUNDEEP
c++cc-preprocessormeson-build
Newbyte
Newbyte

Reputation: 3240

How do I define a C/C++ preprocessor variable in Meson?

I want to conditionally define a variable that I then can use within C/C++ sources to conditionally compile some code, like this:

#ifdef MY_MESON_VARIABLE
    // some code
#endif

How do I go about actually setting MY_MESON_VARIABLE from Meson build system code such that it becomes accessible to the C preprocessor? I already know how do flow control in Meson, so I just need to know how to set a preprocessor variable.

Upvotes: 2

Views: 335

Answers (1)

Garnik
Garnik

Reputation: 71

Meson allows you to define preprocessor variables via compilation arguments. To do this, use add_project_arguments or add_global_arguments, add to Meson.build:

add_project_arguments('-DMY_MESON_VARIABLE', language: 'c')

The -D before the variable name tells the compiler to define the specified variable.

The add_project_arguments function adds compilation arguments that will be applied to the entire project.

This will make MY_MESON_VARIABLE available for #ifdef in C/C++ sources.

Upvotes: 1

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