https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78336
--- Comment #4 from Iain Sandoe <iains at gcc dot gnu.org> --- (In reply to David Edelsohn from comment #3) > So the problem is the reference to ASM_OUTPUT_DEF in rs6000_asm_weaken_decl, > despite the fact that the function never will be called on Darwin. > Previously the ASM_WEAKEN_DECL macro was protected by RS6000_WEAK and now > the function -- with the reference to ASM_OUTPUT_DEF -- is defined > regardless. > > The solutions include: > > 1) Bracket rs6000_asm_weaken_decl with #if RS6000_WEAK to match the previous > logic. > > 2) Bracket rs6000_asm_weaken_decl with #ifdef ASM_OUTPUT_DEF. > > 3) Bracket the call to ASM_OUTPUT_DEF with #ifdef ASM_OUTPUT_DEF. > > 4) Create a no-op definition of ASM_OUTPUT_DEF on Darwin in darwin.h, > similar to xcoff.h. 3 seems neatest with maybe #else gcc_unreachable() or an assert. 4 won't work (as stated above creating a NO-op ASM_OUTPUT_DEF causes a change in the logic in varasm.c). 5) rename the use of ASM_OUTPUT_DEF in rs6000_asm_weaken_decl to RS6000_ASM_OUTPUT_DEF and equate that in rs6000.h and set it to gcc_unreachable in darwin.h
