Allow using CLANG=0 to compile with gcc #39947
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This was referenced May 3, 2020
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Summary
SUMMARY: None
Purpose of change
Make specifying
CLANG=0in a make command work properly.Describe the solution
If clang is not defined, set it to 0. Only use clang when clang != 0. Once
CLANGCMDhas been set, set clang 1, and use that to determine if clang is being used or not later in the makefile.Testing
Can build with and without clang.