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?
