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Help: Update compiler-specific add_compile_options() example and prose

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Avoid hard-coding a warning-as-error flag now that CMake offers a
first class abstraction for that.

Also mention some relevant generator expressions which can be used
to provide even more specific targeting with language-specific flags.

Fixes: #24200
This commit is contained in:
Michael Hirsch
2022-11-27 20:15:18 -05:00
committed by Craig Scott
parent 00630bbac7
commit f03a1833e2
1 changed files with 7 additions and 4 deletions
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11
Help/command/add_compile_options.rst
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@@ -28,13 +28,16 @@ this command is in a compiler-specific conditional clause:
.. code-block:: cmake
if (MSVC)
# warning level 4 and all warnings as errors
add_compile_options(/W4 /WX)
# warning level 4
add_compile_options(/W4)
else()
# lots of warnings and all warnings as errors
add_compile_options(-Wall -Wextra -pedantic -Werror)
# additional warnings
add_compile_options(-Wall -Wextra -Wpedantic)
endif()
To set per-language options, use the :genex:`$<COMPILE_LANGUAGE>`
or :genex:`$<COMPILE_LANGUAGE:languages>` generator expressions.
See Also
^^^^^^^^