gcc/config/rs6000/x-darwin - gcc - Git at Google

 # The spiffy cpp-precomp chokes on some legitimate constructs in GCC
 # sources; use -no-cpp-precomp to get to GNU cpp. (This is another
 # peculiarity of Apple's GCC that we hope to get rid of.)

 CC = cc -no-cpp-precomp
	# The spiffy cpp-precomp chokes on some legitimate constructs in GCC
	# sources; use -no-cpp-precomp to get to GNU cpp. (This is another
	# peculiarity of Apple's GCC that we hope to get rid of.)

	CC = cc -no-cpp-precomp