Afternoon, I'm forwarding a message from Sam James, a fellow Gentoo developer, as he seems to be having some mail delivery issues. The text of his bug report follows:
------------------------ 8< ------------------------ Hello, Note that this has been reported twice before [0][1] but I think I've got a more specific test case. This was reported in Gentoo [2] as well. gmp-6.2.1 when built with gcc 12/13/14 (trunk as of today) combined with -O2 -flto or -O3 -flto is miscompiled, causing a few issues: 1. `make check` for gmp fails the 't-constants' test 2. gcc itself ICEs with a trivial command [3] ```echo hi | aarch64-unknown-linux-gnu-gcc -E -dM -``` 3. gcc hangs with a trivial command: ```echo hi | aarch64-unknown-linux-gnu-gfortran -Werror -xf77 -v -c -``` With regard to command 1 above: ``` # cat t-constants.log Aborted (core dumped) FAIL t-constants (exit status: 134) ``` and: ``` # ./t-constants PP_INVERTED == 21cfe6cfc938b36b, but pp_inverted_calc == 20f8c8b59d4cb9bc After gmp.h, ULONG_MAX defined LONG_MAX defined UINT_MAX defined INT_MAX defined USHRT_MAX defined SHRT_MAX defined ULONG_MAX FFFFFFFFFFFFFFFF ULONG_HIGHBIT 8000000000000000 LONG_MAX 7FFFFFFFFFFFFFFF LONG_MIN 8000000000000000 UINT_MAX FFFFFFFF UINT_HIGHBIT 80000000 INT_MAX 7FFFFFFF INT_MIN 80000000 USHRT_MAX FFFF USHRT_HIGHBIT 8000 SHRT_MAX 7FFF SHRT_MIN FFFF8000 Bits long 64 int 32 short 16 unsigned long 64 unsigned int 32 unsigned short 16 mp_size_t 64 Aborted (core dumped) ``` ... with backtrace: ``` Program received signal SIGABRT, Aborted. 0x0000fffff7df0224 in ?? () from /usr/lib64/libc.so.6 (gdb) bt #0 0x0000fffff7df0224 in ?? () from /usr/lib64/libc.so.6 #1 0x0000fffff7daa03c in raise () from /usr/lib64/libc.so.6 #2 0x0000fffff7d96664 in abort () from /usr/lib64/libc.so.6 #3 0x0000aaaaaaaa0bd8 in main (argc=<optimized out>, argv=<optimized out>) at /var/tmp/portage/dev-libs/gmp-6.2.1-r5/work/gmp-6.2.1/tests/t-constants.c:340 (gdb) ``` When GCC hangs in command 3 above, strace shows no activity & the backtrace from attaching gdb is at https://dev.gentoo.org/~sam/bugs/gmp/arm64-lto/configure.txt. Note that Jannik identified the bad commit [0] as 18082:c5d0fcb06969 [4]. System information: ``` $ ./config.guess aarch64-unknown-linux-gnu $ ./configfsf.guess aarch64-unknown-linux-gnu $ uname -a Linux arm64-20230425-unstable 5.15.64-gentoo-dist #1 SMP Wed Aug 31 17:57:10 -00 2022 aarch64 GNU/Linux $ gcc --version gcc (Gentoo 13.1.0-r1 p1) 13.1.0 Copyright (C) 2023 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. ``` configure output: https://dev.gentoo.org/~sam/bugs/gmp/arm64-lto/configure.txt. I built with ./configure --enable-assembly CFLAGS="-O2 -flto" CXXFLAGS="-O2 -flto" from the gmp-6.2.1.tar.lz tarball then ran 'make' and 'make check' to reproduce. [0] https://gmplib.org/list-archives/gmp-bugs/2020-December/004981.html [1] https://gmplib.org/list-archives/gmp-bugs/2023-January/005223.html [3] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109765 [4] https://gmplib.org/repo/gmp/rev/c5d0fcb06969
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