https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116043
Bug ID: 116043
Summary: [15 regression] TLS relocation issue when building
glibc with -O3 -march=znver4
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: sjames at gcc dot gnu.org
Target Milestone: ---
Created attachment 58731
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=58731&action=edit
argp-help.i.xz
I can report this over on the binutils side if needed but I think it's a
gcc-side issue, but not probed it far yet.
I'm going to clean up the testcase in a minute.
```
$ gcc-15 ../build-amd64-x86_64-pc-linux-gnu-nptl/argp/argp-help.i -O3
-march=znver4 -std=gnu11 -fgnu89-inline -Wl,-z,undefs
[...]
/usr/libexec/gcc/x86_64-pc-linux-gnu/ld:
/tmp/ccnElaGo.o:argp-help.c:(.text+0x1b95): more undefined references to
`strchr' follow
/usr/libexec/gcc/x86_64-pc-linux-gnu/ld: /tmp/ccnElaGo.o: TLS transition from
R_X86_64_GOTTPOFF to R_X86_64_TPOFF32 against `__libc_tsd_CTYPE_B' at 0x22f7 in
section `.text' failed
/usr/libexec/gcc/x86_64-pc-linux-gnu/ld: final link failed: bad value
collect2: error: ld returned 1 exit status
```
The relocation issue isn't there with -O2 or with gcc 14.
--
```
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-linux-gnu/15/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with:
/var/tmp/portage/sys-devel/gcc-15.0.0_pre20240721/work/gcc-15-20240721/configure
--host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --prefix=/usr
--bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/15
--includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/15/include
--datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/15
--mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/15/man
--infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/15/info
--with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/15/include/g++-v15
--disable-silent-rules --disable-dependency-tracking
--with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/15/python
--enable-languages=c,c++,fortran --enable-obsolete --enable-secureplt
--disable-werror --with-system-zlib --enable-nls --without-included-gettext
--disable-libunwind-exceptions --enable-checking=yes,extra,rtl
--with-bugurl=https://bugs.gentoo.org/ --with-pkgversion='Gentoo Hardened
15.0.0_pre20240721 p6' --with-gcc-major-version-only --enable-libstdcxx-time
--enable-lto --disable-libstdcxx-pch --enable-shared --enable-threads=posix
--enable-__cxa_atexit --enable-clocale=gnu --enable-multilib
--with-multilib-list=m32,m64 --disable-fixed-point --enable-targets=all
--enable-libgomp --disable-libssp --disable-libada --enable-cet
--disable-systemtap --disable-valgrind-annotations --disable-vtable-verify
--disable-libvtv --with-zstd --without-isl --enable-default-pie
--enable-host-pie --enable-host-bind-now --enable-default-ssp
--disable-fixincludes --with-build-config='bootstrap-O3 bootstrap-lto
bootstrap-cet'
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 15.0.0 20240721 (experimental) (Gentoo Hardened 15.0.0_pre20240721
p6)
```
