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6b7067460f
Clang issues a warning for double alias redirection, indicating that thei
original symbol is used even if a weak definition attempts to override it.
For instance, in the construction:
int __internal_impl (...) {}
weak_alias (__internal_impl, external_impl);
#if SOMETHING
weak_alias (external_impl, another_external_impl)
#endif
Clang warns that another_external_impl always resolves to __internal_impl,
even if external_impl is a weak reference. Using the internal symbol for
both aliases resolves this warning.
This issue also occurs with certain libc_hidden_def usage:
int __internal_impl (...) {}
weak_alias (__internal_impl, __internal_alias)
libc_hidden_weak (__internal_alias)
In this case, using a strong_alias is sufficient to avoid the warning
(since the alias is internal, there is no need to use a weak alias).
However, for the constructions like:
int __internal_impl (...) {}
weak_alias (__internal_impl, __internal_alias)
libc_hidden_def (__internal_alias)
weak_alias (__internal_impl, external_alias)
libc_hidden_def (external_alias)
Clang warns that the internal external_alias will always resolve to
__GI___internal_impl, even if a weak definition of __GI_internal_impl is
overridden. For this case, a new macro named static_weak_alias is used
to create a strong alias for SHARED, or a weak_alias otherwise.
With these changes, there is no need to check and enable the
-Wno-ignored-attributes suppression when using clang.
Checked with a build on affected ABIs, and a full check on aarch64,
armhf, i686, and x86_64.
Reviewed-by: Sam James <sam@gentoo.org>
55 lines
1.6 KiB
C
55 lines
1.6 KiB
C
/* Convert string representing a number to float value, using given locale.
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Copyright (C) 1997-2025 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <bits/floatn.h>
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#if __HAVE_FLOAT32 && !__HAVE_DISTINCT_FLOAT32
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# define strtof32_l __hide_strtof32_l
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# define wcstof32_l __hide_wcstof32_l
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#endif
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#include <locale.h>
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extern float ____strtof_l_internal (const char *, char **, int, locale_t);
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#define FLOAT float
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#define FLT FLT
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#ifdef USE_WIDE_CHAR
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# define STRTOF wcstof_l
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# define __STRTOF __wcstof_l
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# define STRTOF_NAN __wcstof_nan
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#else
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# define STRTOF strtof_l
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# define __STRTOF __strtof_l
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# define STRTOF_NAN __strtof_nan
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#endif
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#define MPN2FLOAT __mpn_construct_float
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#define FLOAT_HUGE_VAL HUGE_VALF
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#include "strtod_l.c"
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#if __HAVE_FLOAT32 && !__HAVE_DISTINCT_FLOAT32
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# undef strtof32_l
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# undef wcstof32_l
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# ifdef USE_WIDE_CHAR
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weak_alias (__wcstof_l, wcstof32_l)
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# else
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weak_alias (__strtof_l, strtof32_l)
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# endif
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#endif
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