D17863: Add ecm_check_linker_flags function

[Tobias C. Berner]

tcberner created this revision.
tcberner added reviewers: FreeBSD, dfaure, apol.
Herald added projects: Frameworks, Build System.
Herald added subscribers: kde-buildsystem, kde-frameworks-devel.
tcberner requested review of this revision.

REVISION SUMMARY
    kstars appends '-Wl,-z,nodump' to the linker flags, which is not supported 
    by lld>=7 (previous versions just discareded unkonwn flags).
    
    Add an ecm module to check whether a linker flag is supported.
    
    Usage:
    ``` 
          include(ECMCheckLinkerFlags)
          [...]
          # Check for nodump support
          SET(NODUMP_FLAGS "-Wl,-z,nodump")
          ecm_check_linker_flags("${NODUMP_FLAGS}" NODUMP_SUPPORTED)
          if (NODUMP_SUPPORTED)
              SET(SEC_LINK_FLAGS "${SEC_LINK_FLAGS} ${NODUMP_FLAGS}")
          endif ()
     ```

REPOSITORY
  R240 Extra CMake Modules

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D17863

AFFECTED FILES
  modules/ECMCheckLinkerFlags.cmake

To: tcberner, #freebsd, dfaure, apol
Cc: kde-frameworks-devel, kde-buildsystem, michaelh, ngraham, bruns
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