libgcc/config/rs6000/t-crtstuff - gcc - Git at Google

 # If .sdata is enabled __CTOR_{LIST,END}__ go into .sdata instead of
 # .ctors.
 # Do not build crtend.o with -Os as that can result in references to
 # out-of-line register save/restore functions, which may be unresolved
 # as crtend.o is linked after libgcc.a.  See PR45053.
 CRTSTUFF_T_CFLAGS = -msdata=none -O2
	# If .sdata is enabled __CTOR_{LIST,END}__ go into .sdata instead of
	# .ctors.
	# Do not build crtend.o with -Os as that can result in references to
	# out-of-line register save/restore functions, which may be unresolved
	# as crtend.o is linked after libgcc.a. See PR45053.
	CRTSTUFF_T_CFLAGS = -msdata=none -O2