| # This BUILD_CONFIG option is a bit like bootstrap-debug, but rather | 
 | # than comparing stripped object files, it compares compiler internal | 
 | # state during stage3.  Both can be used simultaneously. | 
 |  | 
 | # This makes it slower than bootstrap-debug alone, for there's | 
 | # additional dumping and recompilation during stage3. | 
 | # bootstrap-debug-big can avoid the recompilation, if plenty of disk | 
 | # space is available. | 
 |  | 
 | STAGE2_CFLAGS += -fcompare-debug= | 
 | STAGE3_CFLAGS += -fcompare-debug | 
 | do-compare = $(SHELL) $(srcdir)/contrib/compare-debug $$f1 $$f2 |