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72 lines
2.2 KiB
72 lines
2.2 KiB
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short-description: Adding compiler arguments |
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# Adding arguments |
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Often you need to specify extra compiler arguments. Meson provides two |
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different ways to achieve this: global arguments and per-target |
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arguments. |
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Global arguments |
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-- |
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Global compiler arguments are set with the following command. As an |
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example you could do this. |
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```meson |
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add_global_arguments('-DFOO=bar', language : 'c') |
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``` |
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This makes Meson add the define to all C compilations. Usually you |
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would use this setting for flags for global settings. Note that for |
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setting the C/C++ language standard (the `-std=c99` argument in GCC), |
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you would probably want to use a default option of the [[project]] |
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function. For details see the [reference manual](Reference-manual.md). |
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Global arguments have certain limitations. They all have to be defined |
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before any build targets are specified. This ensures that the global |
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flags are the same for every single source file built in the entire |
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project with one exception. Compilation tests that are run as part of |
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your project configuration do not use these flags. The reason for that |
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is that you may need to run a test compile with and without a given |
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flag to determine your build setup. For this reason tests do not use |
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these global arguments. |
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You should set only the most essential flags with this setting, you |
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should *not* set debug or optimization flags. Instead they should be |
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specified by selecting an appropriate build type. |
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Project arguments |
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-- |
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Project arguments work similar to global arguments except that they |
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are valid only within the current subproject. The usage is simple: |
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```meson |
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add_project_arguments('-DMYPROJ=projname', language : 'c') |
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``` |
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This would add the compiler flags to all C sources in the current |
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project. |
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Per target arguments |
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-- |
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Per target arguments are just as simple to define. |
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```meson |
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executable('prog', 'prog.cc', cpp_args : '-DCPPTHING') |
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``` |
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Here we create a C++ executable with an extra argument that is used |
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during compilation but not for linking. |
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You can find the parameter name for other languages in the [reference |
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tables](Reference-tables.md). |
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Specifying extra linker arguments is done in the same way: |
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```meson |
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executable('prog', 'prog.cc', link_args : '-Wl,--linker-option') |
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```
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