You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
90 lines
3.9 KiB
90 lines
3.9 KiB
Partial backport of this upstream commit: |
|
|
|
commit e15f7de60c26bb75fe1923b17c5f0461164d1a41 |
|
Author: Zack Weinberg <zackw@panix.com> |
|
Date: Sun Nov 20 20:46:30 2016 -0500 |
|
|
|
Split DIAG_* macros to new header libc-diag.h. |
|
|
|
Only the include/libc-diag.h header file is added. |
|
|
|
diff --git a/include/libc-diag.h b/include/libc-diag.h |
|
new file mode 100644 |
|
index 0000000000000000..db138c63b1573256 |
|
--- /dev/null |
|
+++ b/include/libc-diag.h |
|
@@ -0,0 +1,74 @@ |
|
+/* Macros for controlling diagnostic output from the compiler. |
|
+ Copyright (C) 2014-2017 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 |
|
+ <http://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 */
|
|
|