d3c990c645
This fixes object files landing in the source tree in gnu/usr.bin/dtc for GCC platforms. We cannot reliably detect if an external compiler is used here, and the default YES option does include GCC_BOOTSTRAP which implies that GCC may be used for the build. The problem manifests when not using an external compiler, and the host compiler is clang. When a fresh build is done (no OBJDIR yet) the 'make obj' treewalk is done before 'make cross-tools', so COMPILER_FEATURES at this point contains 'c++11' since the host compiler was used for COMPILER_FEATURES. Once cross-tools builds the GCC bootstrap compiler and then descends into 'make everything', COMPILER_FEATURES no longer contains 'c++11' and MK_GPL_DTC defaults to enabled. Now it builds in gnu/usr.bin/dtc without an OBJDIR preset and drops files into the source tree. The COMPILER_FEATURES check here is useful for knowing if we can *bootstrap* C++11 things. Indeed we do bootstrap dtc as a build tool so it is useful for enabling the BSD dtc for the build, but we end up needing the GPL dtc for installation anyway. Reviewed by: manu, emaste Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D12817
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