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| -rw-r--r-- | docs/markdown/snippets/preproc-flags.md | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/docs/markdown/snippets/preproc-flags.md b/docs/markdown/snippets/preproc-flags.md new file mode 100644 index 0000000..a5e9e83 --- /dev/null +++ b/docs/markdown/snippets/preproc-flags.md @@ -0,0 +1,12 @@ +## (C) Preprocessor flag handling + +Meson previously stored `CPPFLAGS` and per-language compilation flags +separately. (That latter would come from `CFLAGS`, `CXXFLAGS`, etc., along with +`<lang>_args` options whether specified no the command-line interface (`-D..`), +`meson.build` (`default_options`), or cross file (`[properties]`).) This was +mostly unobservable, except for certain preprocessor-only checks like +`check_header` would only use the preprocessor flags, leading to confusion if +some `-isystem` was in `CFLAGS` but not `CPPFLAGS`. Now, they are lumped +together, and `CPPFLAGS`, for the languages which are deemed to care to about, +is just another source of compilation flags along with the others already +listed. |