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75 lines
3.4 KiB
C
75 lines
3.4 KiB
C
/* Macros for controlling diagnostic output from the compiler.
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Copyright (C) 2014-2024 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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#ifndef _LIBC_DIAG_H
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#define _LIBC_DIAG_H 1
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/* Ignore the value of an expression when a cast to void does not
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suffice (in particular, for a call to a function declared with
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attribute warn_unused_result). */
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#define ignore_value(x) \
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({ __typeof__ (x) __ignored_value = (x); (void) __ignored_value; })
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/* The macros to control diagnostics are structured like this, rather
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than a single macro that both pushes and pops diagnostic state and
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takes the affected code as an argument, because the GCC pragmas
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work by disabling the diagnostic for a range of source locations
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and do not work when all the pragmas and the affected code are in a
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single macro expansion. */
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/* Push diagnostic state. */
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#define DIAG_PUSH_NEEDS_COMMENT _Pragma ("GCC diagnostic push")
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/* Pop diagnostic state. */
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#define DIAG_POP_NEEDS_COMMENT _Pragma ("GCC diagnostic pop")
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#define _DIAG_STR1(s) #s
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#define _DIAG_STR(s) _DIAG_STR1(s)
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/* Ignore the diagnostic OPTION. VERSION is the most recent GCC
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version for which the diagnostic has been confirmed to appear in
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the absence of the pragma (in the form MAJOR.MINOR for GCC 4.x,
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just MAJOR for GCC 5 and later). Uses of this pragma should be
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reviewed when the GCC version given is no longer supported for
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building glibc; the version number should always be on the same
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source line as the macro name, so such uses can be found with grep.
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Uses should come with a comment giving more details of the
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diagnostic, and an architecture on which it is seen if possibly
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optimization-related and not in architecture-specific code. This
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macro should only be used if the diagnostic seems hard to fix (for
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example, optimization-related false positives). */
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#define DIAG_IGNORE_NEEDS_COMMENT(version, option) \
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_Pragma (_DIAG_STR (GCC diagnostic ignored option))
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/* Similar to DIAG_IGNORE_NEEDS_COMMENT the following macro ignores the
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diagnostic OPTION but only if optimizations for size are enabled.
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This is required because different warnings may be generated for
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different optimization levels. For example a key piece of code may
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only generate a warning when compiled at -Os, but at -O2 you could
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still want the warning to be enabled to catch errors. In this case
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you would use DIAG_IGNORE_Os_NEEDS_COMMENT to disable the warning
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only for -Os. */
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#ifdef __OPTIMIZE_SIZE__
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# define DIAG_IGNORE_Os_NEEDS_COMMENT(version, option) \
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_Pragma (_DIAG_STR (GCC diagnostic ignored option))
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#else
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# define DIAG_IGNORE_Os_NEEDS_COMMENT(version, option)
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#endif
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#endif /* libc-diag.h */
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