cmake HAS_EXTRA_CFLAGS examples

Lewuathe/mlir-hello thirdparty/llvm-project/compiler-rt/cmake/Modules/AddCompilerRT.cmake :218 

list(LENGTH LIB_CFLAGS HAS_EXTRA_CFLAGS)

trailofbits/polytracker polytracker/src/compiler-rt/cmake/Modules/AddCompilerRT.cmake :210 

list(LENGTH LIB_CFLAGS HAS_EXTRA_CFLAGS)

CTSRD-CHERI/cheribsd contrib/subrepo-cheri-compiler-rt/cmake/Modules/AddCompilerRT.cmake :222 

list(LENGTH LIB_CFLAGS HAS_EXTRA_CFLAGS)