https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66448
--- Comment #5 from Aldy Hernandez <aldyh at redhat dot com> --- I don't have access to a Darwin box. Could you provide a preprocessed file so I can try to reproduce the defined but not used problem on a cross build? Also, what triplet? Thanks. On Jun 7, 2015 4:09 AM, "iains at gcc dot gnu.org" <gcc-bugzi...@gcc.gnu.org> wrote: > > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66448 > > --- Comment #1 from Iain Sandoe <iains at gcc dot gnu.org> --- > Created attachment 35710 > --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35710&action=edit > declare "extern int __CFConstantStringClassReference" lazily > > There seem to be three issues triggered by 224161 > > 1. Debug is not initialised when the built-ins are initialised, therefore > any > attempt to declare a variable at that time causes the segv. (hash table is > not > present). > > * at present, *darwin* declares "extern int > __CFConstantStringClassReference[]" at the time that the CFString built-in is > initialised. > > - on the basis that it's not clear *if* such early declarations are allowed, > I've made a patch that makes the declaration lazily (when the fist use of the > built-in occurs). > > This works around the reported crash (one could also use DECL_SOURCE_LOCATION > != BUILTINS_LOCATION as an additional test at passes.c:338, if built-ins > *are* > supposed to be allowed to declare variables. > > … however ... > > ==== > > 2. Once (1) is fixed, bootstrap then fails with: > > /GCC/gcc-trunk/gcc/ipa-pure-const.c:1640:1: error: > ‘{anonymous}::pass_ipa_pure_const::pass_ipa_pure_const(gcc::context*)’ > defined > but not used [-Werror=unused-function] > pass_ipa_pure_const:: > > A --disable-werror boostrap completes, but there are a number of constructors > and destructors that report "declared but not used". AFAICT, it's only > constructors/destructors. > > This is occurring at stage #2, and I thought maybe that the stage#1 compiler > could have been mis-compiled by the bootstrap; however, gcc-4.9, 5.1 and > clang > (xcode 5.1.1) bootstraps all give the same result. > > … additional info … > > ===== > > 3. During bootstrap (and in the test suite on the --disable-werror build) > there > are a large number of warnings from ld64 (of course, this might be a > limitation > of ld64, but for the record): > > warning: invalid DWARF generated by the compiler: DIE 0x000002f7 has multiple > AT_location attributes in > '/GCC/ml/gcc-trunk-xtools/x86_64-apple-darwin12/libgcc/enable-execute-stack_s.o'. > > warning: invalid DWARF generated by the compiler: DIE 0x00000317 has multiple > AT_location attributes in > '/GCC/ml/gcc-trunk-xtools/x86_64-apple-darwin12/libgcc/enable-execute-stack_s.o'. > > > -- > You are receiving this mail because: > You are on the CC list for the bug.
