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* [Bug libstdc++/107693] New: undefined reference to `_ZSt8to_charsPcS_DF128_St12chars_formati' std::format does not work on x86_64-w64-mingw32
@ 2022-11-15 5:29 unlvsur at live dot com
2022-11-15 8:06 ` [Bug libstdc++/107693] " unlvsur at live dot com
` (4 more replies)
0 siblings, 5 replies; 6+ messages in thread
From: unlvsur at live dot com @ 2022-11-15 5:29 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107693
Bug ID: 107693
Summary: undefined reference to
`_ZSt8to_charsPcS_DF128_St12chars_formati' std::format
does not work on x86_64-w64-mingw32
Product: gcc
Version: 13.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: unlvsur at live dot com
Target Milestone: ---
g++ -o fstream_std_format fstream_std_format.cc -Ofast -std=c++23 -s -flto
-march=native -I../../../include -static-libstdc++
lto-wrapper.exe: warning: using serial compilation of 2 LTRANS jobs
lto-wrapper.exe: note: see the '-flto' option documentation for more
information
d:/x86_64-windows-gnu/x86_64-w64-mingw32/bin/../lib/gcc/x86_64-w64-mingw32/13.0.0/../../../../x86_64-w64-mingw32/bin/ld.exe:
C:\Users\unlvs\AppData\Local\Temp\ccc9ergr.ltrans0.ltrans.o:<artificial>:(.text+0x7243):
undefined reference to `_ZSt8to_charsPcS_DF128_'
d:/x86_64-windows-gnu/x86_64-w64-mingw32/bin/../lib/gcc/x86_64-w64-mingw32/13.0.0/../../../../x86_64-w64-mingw32/bin/ld.exe:
C:\Users\unlvs\AppData\Local\Temp\ccc9ergr.ltrans0.ltrans.o:<artificial>:(.text+0x7906):
undefined reference to `_ZSt8to_charsPcS_DF128_St12chars_formati'
....
^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug libstdc++/107693] undefined reference to `_ZSt8to_charsPcS_DF128_St12chars_formati' std::format does not work on x86_64-w64-mingw32
2022-11-15 5:29 [Bug libstdc++/107693] New: undefined reference to `_ZSt8to_charsPcS_DF128_St12chars_formati' std::format does not work on x86_64-w64-mingw32 unlvsur at live dot com
@ 2022-11-15 8:06 ` unlvsur at live dot com
2022-11-15 9:42 ` jakub at gcc dot gnu.org
` (3 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: unlvsur at live dot com @ 2022-11-15 8:06 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107693
--- Comment #1 from cqwrteur <unlvsur at live dot com> ---
Created attachment 53898
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=53898&action=edit
error message
from the
llvm-cxxfilt -n _ZSt8to_charsPcS_DF128_St12chars_format
std::to_chars(char*, char*, _Float128, std::chars_format)
It proves that it has the issue that relates to _Float128. (Probably because of
recent changes of GCC for _Float128 that still has not yet supported it for
charconv)
^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug libstdc++/107693] undefined reference to `_ZSt8to_charsPcS_DF128_St12chars_formati' std::format does not work on x86_64-w64-mingw32
2022-11-15 5:29 [Bug libstdc++/107693] New: undefined reference to `_ZSt8to_charsPcS_DF128_St12chars_formati' std::format does not work on x86_64-w64-mingw32 unlvsur at live dot com
2022-11-15 8:06 ` [Bug libstdc++/107693] " unlvsur at live dot com
@ 2022-11-15 9:42 ` jakub at gcc dot gnu.org
2022-11-15 10:55 ` redi at gcc dot gnu.org
` (2 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: jakub at gcc dot gnu.org @ 2022-11-15 9:42 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107693
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Can you retry without LTO, so that it is clearer where the undefined references
come from? from_chars/to_chars is on Linux supported even for _Float128.
readelf -Wrs libstdc++.a | grep DF128_ | grep -v '\.text\.'
Relocation section
'.rela.gcc_except_table._ZNSt12_GLOBAL__N_117from_chars_strtodIDF128_EESt17from_chars_resultPKcS3_RT_St12chars_format'
at offset 0x67ce0 contains 2 entries:
0000000000013b0d 0000005400000001 R_X86_64_64 0000000000000000
.rodata._ZNSt12_GLOBAL__N_117from_chars_strtodIDF128_EESt17from_chars_resultPKcS3_RT_St12chars_format.str1.1
+ 0
0000000000014a08 0000005400000001 R_X86_64_64 0000000000000000
.rodata._ZNSt12_GLOBAL__N_117from_chars_strtodIDF128_EESt17from_chars_resultPKcS3_RT_St12chars_format.str1.1
+ 0
0000000000000861 0000005800000002 R_X86_64_PC32 0000000000000000
.gcc_except_table._ZNSt12_GLOBAL__N_117from_chars_strtodIDF128_EESt17from_chars_resultPKcS3_RT_St12chars_format
+ 0
00000000000008b5 0000005800000002 R_X86_64_PC32 0000000000000000
.gcc_except_table._ZNSt12_GLOBAL__N_117from_chars_strtodIDF128_EESt17from_chars_resultPKcS3_RT_St12chars_format
+ 14
84: 0000000000000000 0 SECTION LOCAL DEFAULT 81
.rodata._ZNSt12_GLOBAL__N_117from_chars_strtodIDF128_EESt17from_chars_resultPKcS3_RT_St12chars_format.str1.1
87: 0000000000000000 730 FUNC LOCAL DEFAULT 84
_ZNSt12_GLOBAL__N_117from_chars_strtodIDF128_EESt17from_chars_resultPKcS3_RT_St12chars_format
88: 0000000000000000 0 SECTION LOCAL DEFAULT 86
.gcc_except_table._ZNSt12_GLOBAL__N_117from_chars_strtodIDF128_EESt17from_chars_resultPKcS3_RT_St12chars_format
89: 0000000000000000 26 FUNC LOCAL DEFAULT 82
_ZNSt12_GLOBAL__N_117from_chars_strtodIDF128_EESt17from_chars_resultPKcS3_RT_St12chars_format.cold
182: 0000000000000000 9 FUNC GLOBAL DEFAULT 88
_ZSt10from_charsPKcS0_RDF128_St12chars_format
0000000000029bb0 0000004700000001 R_X86_64_64 0000000000000000
.rodata._ZSt29__floating_to_chars_precisionIDF128_ESt15to_chars_resultPcS1_T_St12chars_formati.str1.1
+ 0
0000000000029c0d 0000004700000001 R_X86_64_64 0000000000000000
.rodata._ZSt29__floating_to_chars_precisionIDF128_ESt15to_chars_resultPcS1_T_St12chars_formati.str1.1
+ 0
0000000000037ed9 0000006300000001 R_X86_64_64 0000000000000000
.rodata._ZSt28__floating_to_chars_shortestIDF128_ESt15to_chars_resultPcS1_T_St12chars_format.part.0.str1.1
+ 0
0000000000037f25 0000006300000001 R_X86_64_64 0000000000000000
.rodata._ZSt28__floating_to_chars_shortestIDF128_ESt15to_chars_resultPcS1_T_St12chars_format.part.0.str1.1
+ 0
00000000000007dd 0000007300000002 R_X86_64_PC32 0000000000000000
.gcc_except_table._ZSt8to_charsPcS_DF128_ + 0
00000000000007f9 0000007500000002 R_X86_64_PC32 0000000000000000
.gcc_except_table._ZSt8to_charsPcS_DF128_St12chars_format + 0
000000000000081d 0000007700000002 R_X86_64_PC32 0000000000000000
.gcc_except_table._ZSt8to_charsPcS_DF128_St12chars_formati + 0
9: 0000000000000000 670 FUNC LOCAL DEFAULT 14
_ZSt22__handle_special_valueIDF128_ESt8optionalISt15to_chars_resultEPcS3_T_St12chars_formati
70: 0000000000000000 1997 FUNC LOCAL DEFAULT 69
_ZSt23__floating_to_chars_hexIDF128_ESt15to_chars_resultPcS1_T_St8optionalIiE.isra.0
71: 0000000000000000 0 SECTION LOCAL DEFAULT 71
.rodata._ZSt29__floating_to_chars_precisionIDF128_ESt15to_chars_resultPcS1_T_St12chars_formati.str1.1
73: 0000000000000000 1731 FUNC LOCAL DEFAULT 72
_ZSt29__floating_to_chars_precisionIDF128_ESt15to_chars_resultPcS1_T_St12chars_formati
99: 0000000000000000 0 SECTION LOCAL DEFAULT 92
.rodata._ZSt28__floating_to_chars_shortestIDF128_ESt15to_chars_resultPcS1_T_St12chars_format.part.0.str1.1
101: 0000000000000000 5211 FUNC LOCAL DEFAULT 93
_ZSt28__floating_to_chars_shortestIDF128_ESt15to_chars_resultPcS1_T_St12chars_format.part.0
115: 0000000000000000 0 SECTION LOCAL DEFAULT 114
.gcc_except_table._ZSt8to_charsPcS_DF128_
117: 0000000000000000 0 SECTION LOCAL DEFAULT 117
.gcc_except_table._ZSt8to_charsPcS_DF128_St12chars_format
119: 0000000000000000 0 SECTION LOCAL DEFAULT 120
.gcc_except_table._ZSt8to_charsPcS_DF128_St12chars_formati
252: 0000000000000000 20 FUNC GLOBAL DEFAULT 112
_ZSt8to_charsPcS_DF128_
255: 0000000000000000 47 FUNC GLOBAL DEFAULT 115
_ZSt8to_charsPcS_DF128_St12chars_format
256: 0000000000000000 18 FUNC GLOBAL DEFAULT 118
_ZSt8to_charsPcS_DF128_St12chars_formati
But the intent was that this would be only enabled if long double is the mode
as _Float128, or for powerpc64le-linux (where it is enabled for some time
already),
or on x86/ia64 if on glibc:
// For now we only support __float128 when it's the powerpc64 __ieee128 type.
#if defined _GLIBCXX_LONG_DOUBLE_ALT128_COMPAT && __FLT128_MANT_DIG__ == 113
// Define overloads of std::to_chars for __float128.
# define FLOAT128_TO_CHARS 1
using F128_type = __float128;
#elif __FLT128_MANT_DIG__ == 113 && __LDBL_MANT_DIG__ != 113 \
&& defined(__GLIBC_PREREQ)
# define FLOAT128_TO_CHARS 1
using F128_type = _Float128;
#else
using F128_type = void;
#endif
So, does mingw predefine __GLIBC_PREREQ somewhere or how comes this is enabled
at all for you?
^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug libstdc++/107693] undefined reference to `_ZSt8to_charsPcS_DF128_St12chars_formati' std::format does not work on x86_64-w64-mingw32
2022-11-15 5:29 [Bug libstdc++/107693] New: undefined reference to `_ZSt8to_charsPcS_DF128_St12chars_formati' std::format does not work on x86_64-w64-mingw32 unlvsur at live dot com
2022-11-15 8:06 ` [Bug libstdc++/107693] " unlvsur at live dot com
2022-11-15 9:42 ` jakub at gcc dot gnu.org
@ 2022-11-15 10:55 ` redi at gcc dot gnu.org
2022-11-15 14:29 ` cvs-commit at gcc dot gnu.org
2022-11-15 14:32 ` redi at gcc dot gnu.org
4 siblings, 0 replies; 6+ messages in thread
From: redi at gcc dot gnu.org @ 2022-11-15 10:55 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107693
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Assignee|unassigned at gcc dot gnu.org |redi at gcc dot gnu.org
Status|UNCONFIRMED |ASSIGNED
Target Milestone|--- |13.0
Ever confirmed|0 |1
Last reconfirmed| |2022-11-15
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
It's just a bug in the macro definitions in <format>, we don't have
std::to_chars for _Float128 for mingw so shouldn't try to support it in
std::format.
I have a patch already.
^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug libstdc++/107693] undefined reference to `_ZSt8to_charsPcS_DF128_St12chars_formati' std::format does not work on x86_64-w64-mingw32
2022-11-15 5:29 [Bug libstdc++/107693] New: undefined reference to `_ZSt8to_charsPcS_DF128_St12chars_formati' std::format does not work on x86_64-w64-mingw32 unlvsur at live dot com
` (2 preceding siblings ...)
2022-11-15 10:55 ` redi at gcc dot gnu.org
@ 2022-11-15 14:29 ` cvs-commit at gcc dot gnu.org
2022-11-15 14:32 ` redi at gcc dot gnu.org
4 siblings, 0 replies; 6+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2022-11-15 14:29 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107693
--- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jonathan Wakely <redi@gcc.gnu.org>:
https://gcc.gnu.org/g:ce86d9678b7f3d914133a035fbf8088504d8bad8
commit r13-4059-gce86d9678b7f3d914133a035fbf8088504d8bad8
Author: Jonathan Wakely <jwakely@redhat.com>
Date: Tue Nov 15 13:44:38 2022 +0000
libstdc++: Fix detection of std::format support for __float128 [PR107693]
std::format gives linker errors on targets that define __float128 but
do not support using it with std::to_chars. This improves the handling
of 128-bit flaoting-point types so they are disabled if unsupportable.
libstdc++-v3/ChangeLog:
PR libstdc++/107693
* include/std/format (_GLIBCXX_FORMAT_F128): Define to 2 when
basic_format_arg needs to use its _M_f128 member.
(__extended_floating_point, __floating_point): Replace with ...
(__formattable_floating_point): New concept.
* testsuite/std/format/functions/format.cc: Check whether
__float128 is supported. Also test _Float128.
^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug libstdc++/107693] undefined reference to `_ZSt8to_charsPcS_DF128_St12chars_formati' std::format does not work on x86_64-w64-mingw32
2022-11-15 5:29 [Bug libstdc++/107693] New: undefined reference to `_ZSt8to_charsPcS_DF128_St12chars_formati' std::format does not work on x86_64-w64-mingw32 unlvsur at live dot com
` (3 preceding siblings ...)
2022-11-15 14:29 ` cvs-commit at gcc dot gnu.org
@ 2022-11-15 14:32 ` redi at gcc dot gnu.org
4 siblings, 0 replies; 6+ messages in thread
From: redi at gcc dot gnu.org @ 2022-11-15 14:32 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107693
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |FIXED
Status|ASSIGNED |RESOLVED
--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Fixed. __float128 is not formattable on this target.
^ permalink raw reply [flat|nested] 6+ messages in thread
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2022-11-15 5:29 [Bug libstdc++/107693] New: undefined reference to `_ZSt8to_charsPcS_DF128_St12chars_formati' std::format does not work on x86_64-w64-mingw32 unlvsur at live dot com
2022-11-15 8:06 ` [Bug libstdc++/107693] " unlvsur at live dot com
2022-11-15 9:42 ` jakub at gcc dot gnu.org
2022-11-15 10:55 ` redi at gcc dot gnu.org
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