From mboxrd@z Thu Jan  1 00:00:00 1970
From: bugzilla at busybox.net <bugzilla@busybox.net>
Date: Thu, 24 Jul 2014 10:12:18 +0000 (UTC)
Subject: [Buildroot] [Bug 7280] New: CMake toolchain file uses the FORCE
 attribute on CMAKE_CXX_FLAGS
Message-ID: <bug-7280-163@https.bugs.busybox.net/>
List-Id: <buildroot.busybox.net>
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To: buildroot@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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