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* [gcc(refs/users/giulianob/heads/autopar_rebase2)] libstdc++: Check _GLIBCXX_USE_C99_STDLIB for strtof and strtold
@ 2020-08-18 1:18 Giuliano Belinassi
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From: Giuliano Belinassi @ 2020-08-18 1:18 UTC (permalink / raw)
To: gcc-cvs, libstdc++-cvs
https://gcc.gnu.org/g:c4a68ac16456ac8b04e6d0e2d21d174486516a39
commit c4a68ac16456ac8b04e6d0e2d21d174486516a39
Author: Jonathan Wakely <jwakely@redhat.com>
Date: Thu Jul 30 20:55:56 2020 +0100
libstdc++: Check _GLIBCXX_USE_C99_STDLIB for strtof and strtold
On broken systems we only have strtod, not strtof and strtold. Just use
strtod for all types, even though that will produce incorrect results in
some cases.
Similarly, if _GLIBCXX_USE_C99_MATH is not defined then std::isinf won't
be declared. Just refer to it unqualified, which should find the C
library's isinf macro if that hasn't been #undef'd by <cmath>.
libstdc++-v3/ChangeLog:
* src/c++17/floating_from_chars.cc (from_chars_impl): Use
isinf unqualified.
[!_GLIBCXX_USE_C99_STDLIB]: Use strtod for float and long
double.
Diff:
---
libstdc++-v3/src/c++17/floating_from_chars.cc | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/libstdc++-v3/src/c++17/floating_from_chars.cc b/libstdc++-v3/src/c++17/floating_from_chars.cc
index f1519e5c7b6..26b69a38521 100644
--- a/libstdc++-v3/src/c++17/floating_from_chars.cc
+++ b/libstdc++-v3/src/c++17/floating_from_chars.cc
@@ -300,12 +300,16 @@ namespace
errno = 0;
char* endptr;
T tmpval;
+#if _GLIBCXX_USE_C99_STDLIB
if constexpr (is_same_v<T, float>)
tmpval = std::strtof(str, &endptr);
- if constexpr (is_same_v<T, double>)
+ else if constexpr (is_same_v<T, double>)
tmpval = std::strtod(str, &endptr);
else if constexpr (is_same_v<T, long double>)
tmpval = std::strtold(str, &endptr);
+#else
+ tmpval = std::strtod(str, &endptr);
+#endif
const int conv_errno = std::__exchange(errno, save_errno);
#if _GLIBCXX_USE_C99_FENV_TR1
@@ -319,7 +323,7 @@ namespace
const ptrdiff_t n = endptr - str;
if (conv_errno == ERANGE) [[unlikely]]
{
- if (std::isinf(tmpval)) // overflow
+ if (isinf(tmpval)) // overflow
ec = errc::result_out_of_range;
else // underflow (LWG 3081 wants to set value = tmpval here)
ec = errc::result_out_of_range;
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