https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98370
Bug ID: 98370
Summary: libstdc++-v3/src/c++17/floating_to_chars.cc fails to
compile unless `int32_t' is `int'
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: p...@gcc-bugzilla.mail.kapsi.fi
Target Milestone: ---
Target: aarch64-*-elf
Hi.
Using GCC 11.0.0 20201218.
libstdc++-v3/src/c++17/floating_to_chars.cc:
978 const int whole_digits = max(mantissa_length + fd.exponent, 1);
`mantissa_length' is `int' while `fd.exponent' is `int32_t'. If targetting
e.g. AArch64 ILP32 `__INT32_TYPE__' is `long int' and this causes failure with
`max(const _Tp&, const _Tp&)'.
There appears to be no other problematic locations for AArch64 ILP32.
<...>libstdc++-v3/src/c++17/floating_to_chars.cc: In instantiation of
'std::to_chars_result std::__floating_to_chars_shortest(char*, char*, T,
std::chars_format) [with T = float]':
<...>libstdc++-v3/src/c++17/floating_to_chars.cc:1484:73: required from here
<...>libstdc++-v3/src/c++17/floating_to_chars.cc:978:37: error: no matching
function for call to 'max(long int, int)'
978 | const int whole_digits = max(mantissa_length + fd.exponent, 1);
| ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from <...>libstdc++-v3/include/bits/specfun.h:45,
from <...>libstdc++-v3/include/cmath:1927,
from <...>libstdc++-v3/src/c++17/floating_to_chars.cc:33:
<...>/libstdc++-v3/include/bits/stl_algobase.h:254:5: note: candidate:
'template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)'
254 | max(const _Tp& __a, const _Tp& __b)
| ^~~
