I think this one counts as obvious, but I'll ask for permission anyway. Bootstrapped etc. powerpc-linux. OK everywhere?
PR target/45053 * config/rs6000/t-crtstuff (CRTSTUFF_T_CFLAGS): Add -O2. Index: libgcc/config/rs6000/t-crtstuff =================================================================== --- libgcc/config/rs6000/t-crtstuff (revision 195839) +++ libgcc/config/rs6000/t-crtstuff (working copy) @@ -1,3 +1,6 @@ # If .sdata is enabled __CTOR_{LIST,END}__ go into .sdata instead of # .ctors. -CRTSTUFF_T_CFLAGS = -msdata=none +# 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. +CRTSTUFF_T_CFLAGS = -msdata=none -O2 -- Alan Modra Australia Development Lab, IBM