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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>
67 lines
1.9 KiB
C
67 lines
1.9 KiB
C
/* Manipulate file descriptor. Linux LFS version.
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Copyright (C) 2018-2025 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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#define fcntl __no_decl_fcntl
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#define __fcntl __no_decl___fcntl
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#include <fcntl.h>
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#undef fcntl
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#undef __fcntl
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#include <stdarg.h>
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#include <errno.h>
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#include <sysdep-cancel.h>
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#ifndef __NR_fcntl64
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# define __NR_fcntl64 __NR_fcntl
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#endif
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#ifndef FCNTL_ADJUST_CMD
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# define FCNTL_ADJUST_CMD(__cmd) __cmd
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#endif
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int
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__libc_fcntl64 (int fd, int cmd, ...)
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{
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va_list ap;
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void *arg;
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va_start (ap, cmd);
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arg = va_arg (ap, void *);
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va_end (ap);
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cmd = FCNTL_ADJUST_CMD (cmd);
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if (cmd == F_SETLKW || cmd == F_SETLKW64 || cmd == F_OFD_SETLKW)
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return SYSCALL_CANCEL (fcntl64, fd, cmd, arg);
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return __fcntl64_nocancel_adjusted (fd, cmd, arg);
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}
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libc_hidden_def (__libc_fcntl64)
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strong_alias (__libc_fcntl64, __fcntl64)
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libc_hidden_weak (__fcntl64)
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weak_alias (__libc_fcntl64, fcntl64)
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#if __TIMESIZE != 64
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weak_alias (__libc_fcntl64, __fcntl_time64)
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#endif
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#ifdef __OFF_T_MATCHES_OFF64_T
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weak_alias (__libc_fcntl64, __libc_fcntl)
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weak_alias (__libc_fcntl64, __fcntl)
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weak_alias (__libc_fcntl64, __GI___fcntl)
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weak_alias (__libc_fcntl64, fcntl)
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#endif
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