cmake COMPILER_RT_HAS_FUNC_SYMBOL examples

Lewuathe/mlir-hello thirdparty/llvm-project/compiler-rt/cmake/config-ix.cmake :182 

check_symbol_exists(__func__ "" COMPILER_RT_HAS_FUNC_SYMBOL)

trailofbits/polytracker polytracker/src/compiler-rt/cmake/config-ix.cmake :122 

check_symbol_exists(__func__ "" COMPILER_RT_HAS_FUNC_SYMBOL)

CTSRD-CHERI/cheribsd contrib/subrepo-cheri-compiler-rt/cmake/config-ix.cmake :159 

check_symbol_exists(__func__ "" COMPILER_RT_HAS_FUNC_SYMBOL)