[CMake] Custom RPM build failing for want of RPMBUILD_FLAGS

[Stewart, Robert]

We've recently upgraded CMake from 2.8+ to 3.5+ (different versions on different platforms).  In so doing, our CMake invocation of CPack to create RPMs now fails and I'm hoping someone can help.  I have a spec file and I want to run rpmbuild -bb, but I can't figure out how to do it.

We have been using a custom spec file all along, but I found information indicating that doing so is (now?) considered a hack and that everything should be possible merely by setting CPACK_* variables.  Unfortunately, that's not the case.  With the following %files entries, CPackRPM.cmake chokes:

%defattr(-, %{user}, %{group}, 0755)
%dir %{destination}
%dir %{versioned}
%dir %{foo}
%{foo}/*.sh
%attr(555, %{user}, %{group}) %{foo}/a
%dir %{bar}
%attr(544, %{user}, %{group}) %{bar}/b
%attr(444, %{user}, %{group}) %{bar}/*common
%{bar}/lib

The result is that my attempt to port to the all-variable approach failed, so I'm setting CPACK_RPM_USER_BINARY_SPECFILE to refer to my spec file as before.  Unfortunately, when I do so, CPackRPM.cmake doesn't set RPMBUILD_FLAGS, and that leads to rpmbuild doing nothing useful.  The issue is in the following code:

    # We should generate a USER spec file template:
    #  - either because the user asked for it : CPACK_RPM_GENERATE_USER_BINARY_SPECFILE_TEMPLATE
    #  - or the user did not provide one : NOT CPACK_RPM_USER_BINARY_SPECFILE
    if(CPACK_RPM_GENERATE_USER_BINARY_SPECFILE_TEMPLATE OR NOT CPACK_RPM_USER_BINARY_SPECFILE)
      set(RPMBUILD_FLAGS "-bb")

I tried just setting RPMBUILD_FLAGS to -bb in my CMakeLists.txt, where I include CPack, but that isn't propagated to CPackRPM.cmake.  I tried adding a custom target that invoked "${CMAKE_CPACK_COMMAND} -D RPMBUILD_FLAGS=-bb", but that didn't work either.

If the regex processing of the %files content were more robust, I wouldn't trip over the RPMBUILD_FLAGS issue, but either CPACK_RPM_USER_BINARY_SPECFILE is supported or it isn't, and since it is currently, it should be possible for me to set RPMBUILD_FLAGS.

Ideas?

___
Rob


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