[Buildroot] [Bug 7280] New: CMake toolchain file uses the FORCE attribute on CMAKE_CXX_FLAGS

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=7280

           Summary: CMake toolchain file uses the FORCE attribute on
                    CMAKE_CXX_FLAGS
           Product: buildroot
           Version: 2014.05
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: minor
          Priority: P5
         Component: Other
        AssignedTo: unassigned at buildroot.uclibc.org
        ReportedBy: deblauwetom+buildroot at gmail.com
                CC: buildroot at uclibc.org
   Estimated Hours: 0.0


It seems the cmake toolchain file generated by buildroot uses "FORCE" to set
the CXX and C flags. However, this can be a problem. The toolchain file is read
every run of cmake, so the CXX flags keep growing. This results in a complete
rebuild everytime something changes in a CMakeLists.txt. CMake correctly thinks
that it must rebuild everything because the CMAKE_CXX_FLAGS must be applied to
all which you are compiling. It can be solved by removing the FORCE attribute
of the set() command. The same goes for the CMAKE_C_FLAGS.

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