https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116378
Iain Sandoe <iains at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Ever confirmed|0 |1
Last reconfirmed| |2024-08-15
Status|UNCONFIRMED |NEW
--- Comment #1 from Iain Sandoe <iains at gcc dot gnu.org> ---
reproduced on multiple Darwin versions, so confirming.
(guess) Looks to me as if there might be UB somewhere - perhaps a function that
should have a return statement is missing it? (see the asm below)
example:
m2/boot-bin/mc --olang=c++ --h-file-prefix=G
-I/src-local/gcc-master/gcc/m2/gm2-libs
-I/src-local/gcc-master/gcc/m2/gm2-compiler
-I/src-local/gcc-master/gcc/m2/gm2-libiberty
-I/src-local/gcc-master/gcc/m2/gm2-gcc --quiet --gcc-config-system
-o=m2/gm2-libs-boot/GASCII.h /src-local/gcc-master/gcc/m2/gm2-libs/ASCII.def -v
Illegal instruction: 4
====
* thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_INSTRUCTION
(code=EXC_I386_INVOP, subcode=0x0)
frame #0: 0x000000010008a279 mc`libc_open + 10
mc`libc_open:
-> 0x10008a279 <+10>: ud2
mc`dtoa_dtoa.cold:
0x10008a27b <+0>: leaq 0x526a(%rip), %rdx ; "dtoa_dtoa"
0x10008a282 <+7>: movl $0xa4, %esi
0x10008a287 <+12>: leaq 0x526a(%rip), %rdi ;
"/src-local/gcc-master/gcc/m2/mc-boot-ch/Gdtoa.cc"
Target 0: (mc) stopped.
(lldb) bt
* thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_INSTRUCTION
(code=EXC_I386_INVOP, subcode=0x0)
* frame #0: 0x000000010008a279 mc`libc_open + 10
frame #1: 0x0000000100003764 mc`ConnectToUnix(unsigned int, bool, bool)
(.part.0) + 100
frame #2: 0x0000000100003a8b mc`FIO_openToRead + 91
frame #3: 0x0000000100004809 mc`FIO_exists + 9
frame #4: 0x00000001000405a3 mc`mcSearch_findSourceFile + 403
frame #5: 0x00000001000362d1 mc`openDef(void*, bool) + 65
frame #6: 0x00000001000364cf mc`pass(unsigned int, void*,
mcComp_parserFunction_p, decl_isNodeF_p, mcComp_openFunction_p) (.isra.0) + 63
frame #7: 0x000000010003653a mc`p1(void*) + 42
frame #8: 0x000000010001093c mc`Indexing_ForeachIndiceInIndexDo + 60
frame #9: 0x0000000100036463 mc`doPass(bool, bool, unsigned int,
symbolKey_performOperation_p, char const*, unsigned int) (.constprop.0) + 275
frame #10: 0x0000000100036919 mc`mcComp_compile + 297
frame #11: 0x000000010008a866 mc`main + 758
frame #12: 0x00007fff6f105cc9 libdyld.dylib`start + 1
frame #13: 0x00007fff6f105cc9 libdyld.dylib`start + 1
====
Looks like that's hit an unreachable (which has been made into a trap).
dis -n libc_open
mc`libc_open:
0x10008a26f <+0>: leaq 0x8(%rsp), %rax
0x10008a274 <+5>: movq %rax, -0x10(%rsp)
-> 0x10008a279 <+10>: ud2
