/* Macros for controlling diagnostic output from the compiler. Copyright (C) 2014-2020 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ #ifndef _LIBC_DIAG_H #define _LIBC_DIAG_H 1 /* Ignore the value of an expression when a cast to void does not suffice (in particular, for a call to a function declared with attribute warn_unused_result). */ #define ignore_value(x) \ ({ __typeof__ (x) __ignored_value = (x); (void) __ignored_value; }) /* The macros to control diagnostics are structured like this, rather than a single macro that both pushes and pops diagnostic state and takes the affected code as an argument, because the GCC pragmas work by disabling the diagnostic for a range of source locations and do not work when all the pragmas and the affected code are in a single macro expansion. */ /* Push diagnostic state. */ #define DIAG_PUSH_NEEDS_COMMENT _Pragma ("GCC diagnostic push") /* Pop diagnostic state. */ #define DIAG_POP_NEEDS_COMMENT _Pragma ("GCC diagnostic pop") #define _DIAG_STR1(s) #s #define _DIAG_STR(s) _DIAG_STR1(s) /* Ignore the diagnostic OPTION. VERSION is the most recent GCC version for which the diagnostic has been confirmed to appear in the absence of the pragma (in the form MAJOR.MINOR for GCC 4.x, just MAJOR for GCC 5 and later). Uses of this pragma should be reviewed when the GCC version given is no longer supported for building glibc; the version number should always be on the same source line as the macro name, so such uses can be found with grep. Uses should come with a comment giving more details of the diagnostic, and an architecture on which it is seen if possibly optimization-related and not in architecture-specific code. This macro should only be used if the diagnostic seems hard to fix (for example, optimization-related false positives). */ #define DIAG_IGNORE_NEEDS_COMMENT(version, option) \ _Pragma (_DIAG_STR (GCC diagnostic ignored option)) /* Similar to DIAG_IGNORE_NEEDS_COMMENT the following macro ignores the diagnostic OPTION but only if optimizations for size are enabled. This is required because different warnings may be generated for different optimization levels. For example a key piece of code may only generate a warning when compiled at -Os, but at -O2 you could still want the warning to be enabled to catch errors. In this case you would use DIAG_IGNORE_Os_NEEDS_COMMENT to disable the warning only for -Os. */ #ifdef __OPTIMIZE_SIZE__ # define DIAG_IGNORE_Os_NEEDS_COMMENT(version, option) \ _Pragma (_DIAG_STR (GCC diagnostic ignored option)) #else # define DIAG_IGNORE_Os_NEEDS_COMMENT(version, option) #endif #endif /* libc-diag.h */