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    [Autotools] Rework the build target selection · bca0b279
    zandobersek@gmail.com authored
    https://bugs.webkit.org/show_bug.cgi?id=121703
    
    Reviewed by Gustavo Noronha Silva.
    
    Replace the --with-target configuration flag with target-specific --enable-*-target flags:
    - --enable-x11-target
    - --enable-wayland-target
    - --enable-win32-target
    - --enable-quartz-target
    - --enable-directfb-target
    
    By default, the X11 target is enabled. This default is preserved only if no --enable-*-target flag
    is passed on the command line. When that occurs, the newly-constructed list of build targets is
    used to determine what build targets should actually be built. So for instance, executing just
    `./configure` would only enable the X11 target as that's the default, and executing
    `./configure --enable-wayland-target` would only enable the Wayland target, as the defaults are
    completely ignored.
    
    * Source/autotools/CheckSystemAndBasicDependencies.m4: Abort if grep was not found, just in case.
    * Source/autotools/CustomMacros.m4: The new file that contains helpful custom macros.
    * Source/autotools/FindDependencies.m4: Use the appropriate 'enable_*_target' references instead of 'with_*target'.
    * Source/autotools/PrintBuildConfiguration.m4: Use the new AM_APPEND_TO_DESCRIPTION macro to construct a pretty-looking
    description string of what targets will be built.
    * Source/autotools/ReadCommandLineArguments.m4: Replace the --with-target configuration flag and the related
    hacks with the set of --enable-*-target flags. The new AM_DETERMINE_BUILD_TARGET_STATUS macro is used to determine
    whether to enable specific build targets, based indirectly on the passed-in --enable-*-target flags.
    * Source/autotools/SetupAutoconfHeader.m4: Use the appropriate 'enable_*_target' references instead of 'with_*target'.
    * Source/autotools/SetupAutomake.m4: Use the appropriate 'enable_*_target' references instead of 'with_*target'.
    * configure.ac: Include the new CustomMacros.m4 file.
    
    
    git-svn-id: http://svn.webkit.org/repository/webkit/trunk@156271 268f45cc-cd09-0410-ab3c-d52691b4dbfc
    bca0b279