Hi gnulib-developers, just as information, I've committed the glibc patch
"s390x: Require GCC 7.1 or later to build glibc." http://sourceware.org/git/?p=glibc.git;a=commit;h=844b4d8b4b937fe6943d2c0c80ce7d871cdb1eb5 as if build with gcc 6.5.0, __builtin_add_overflow incorrectly detects overflow on s390x. Please find the link to gcc-Bug on the discussion on libc-alpha: On 12/17/20 6:35 PM, Adhemerval Zanella wrote: > On 15/12/2020 11:18, Stefan Liebler via Libc-alpha wrote: >> GCC 6.5 fails to correctly build ldconfig with recent ld.so.cache >> commits, e.g.: >> 785969a047ad2f23f758901c6816422573544453 >> elf: Implement a string table for ldconfig, with tail merging >> >> If glibc is build with gcc 6.5.0: >> __builtin_add_overflow is used in >> <glibc>/elf/stringtable.c:stringtable_finalize() >> which leads to ldconfig failing with "String table is too large". >> This is also recognizable in following tests: >> FAIL: elf/tst-glibc-hwcaps-cache >> FAIL: elf/tst-glibc-hwcaps-prepend-cache >> FAIL: elf/tst-ldconfig-X >> FAIL: elf/tst-ldconfig-bad-aux-cache >> FAIL: elf/tst-ldconfig-ld_so_conf-update >> FAIL: elf/tst-stringtable >> >> See gcc "Bug 98269 - gcc 6.5.0 __builtin_add_overflow() with small >> uint32_t values incorrectly detects overflow" >> (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98269) > > In any case, it would be good to alert gnulib developers about this > potential issue. Bye, Stefan
