CMake/Help/release/dev/toolchain-flag-init.rst at a66004bee06023e9da4e0895ee1afbceaff33bdb - CMake - Gitea - ZeroTwo

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Brad King a66004bee0 Honor CMAKE_<LANG>_FLAGS[_<CONFIG>]_INIT set in toolchain files

Document these variables.

Change our convention for setting these variables from:

    set(CMAKE_C_FLAGS_INIT "...")

to

    string(APPEND CMAKE_C_FLAGS_INIT " ...")

so that any value previously set by a toolchain file will be used.

Automate the conversion with:

    sed -i 's/set *(\(CMAKE_\(C\|CXX\|Fortran\|RC\|ASM\|${[^}]\+}\)_FLAGS\(_[^_]\+\)\?_INIT \+"\)/string(APPEND \1 /' \
      Modules/Compiler/*.cmake Modules/Platform/*.cmake

and follow up with some manual fixes (e.g. to cases that already
meant to append).  Also revert the automated changes to contexts
that are not protected from running multiple times.

2016-07-06 10:13:31 -04:00

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 toolchain-flag-init
 -------------------
 * :variable:`Toolchain files <CMAKE_TOOLCHAIN_FILE>` may now set a
   :variable:`CMAKE_<LANG>_FLAGS_INIT` variable to initialize the
   :variable:`CMAKE_<LANG>_FLAGS` cache entry the first time a language is
   enabled in a build tree.