[Differential] [Request, 7 lines] D3733: Force colored warnings in ninja's output

[elvisangelaccio (Elvis Angelaccio)]

elvisangelaccio created this revision.
elvisangelaccio added a reviewer: Frameworks.

REVISION SUMMARY
  Colored compiler warnings in ninja output only work with the
  `-fdiagnostics-color=always` flag.
  See https://github.com/ninja-build/ninja/issues/814 for a rationale.
  
  This patch adds such flag in ecm for gcc >= 4.9 and clang >= 3.5; 
  I'm not sure which version of clang is the first that supports this flag, but it
  cannot be < 3.5 because 3.5 was the first release after gcc 4.9.

TEST PLAN
  ninja+gcc and ninja+clang now show nice colored compiler warnings.

REPOSITORY
  R240 Extra CMake Modules

BRANCH
  ninja-colors

REVISION DETAIL
  https://phabricator.kde.org/D3733

AFFECTED FILES
  kde-modules/KDECompilerSettings.cmake

EMAIL PREFERENCES
  https://phabricator.kde.org/settings/panel/emailpreferences/

To: elvisangelaccio, #frameworks
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