CMake/Tests/RunCMake/CompileFeatures/CMP0128WarnUnset.cmake at 6d39c845eece813870e065802b4fd9b05ab212d9 - CMake - Gitea - ZeroTwo

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Raul Tambre 4a0485be7f cmStandardLevelResolver: Avoid unnecessary flags, fix unset level logic

The changes are part of CMP0128.

When the standard level is unset:
* Flags are added if extension mode doesn't match the compiler's default.
  Previously logic only worked if LANG_EXTENSIONS was ON. Fixes #22224.
* The full flag is used. Previously CMAKE_LANG_EXTENSION_COMPILE_OPTION was
  used. This was only supported for IAR.

Otherwise:
* Avoid adding flags if not necessary per the detected compiler defaults.
* Fixed check for when the requested standard is older. It now matches the
  nearby comments.

I reworded the fallback comment as its logic was a bit difficult to wrap my
head around.

2021-09-29 22:28:40 +03:00

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 enable_language(@lang@)
 cmake_policy(SET CMP0128 OLD)
 set(CMAKE_POLICY_WARNING_CMP0128 ON)
 set(CMAKE_@lang@_EXTENSIONS @extensions_opposite@)
 add_library(foo "@RunCMake_SOURCE_DIR@/empty.@ext@")