D18547: Don't enable -Wzero-as-null-pointer-constant on apple clang

[Hannah von Reth]

vonreth added a comment.


  In D18547#400298 <https://phabricator.kde.org/D18547#400298>, @aacid wrote:
  
  > Why?
  
  
  Why it breaks the cmake macro or why apple clang doesn't support it?
  The second one I can't answer, for the first, its the same reason why we had to bump the cmake version requirement to 3 recently.
  The cmake detection for the visibility flag is looking for the exit code and for warnings.
  If the test fails it asumes that there are no visibility flags...

REPOSITORY
  R240 Extra CMake Modules

REVISION DETAIL
  https://phabricator.kde.org/D18547

To: vonreth, aacid, apol, dfaure, rjvbb, bcooksley
Cc: aacid, kde-frameworks-devel, kde-buildsystem, michaelh, ngraham, bruns
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