[tz] [PROPOSED 4/5] Use C23 [[unsequenced]] if available
Paul Eggert
eggert at cs.ucla.edu
Mon Nov 21 18:36:42 UTC 2022
* private.h (ATTRIBUTE_UNSEQUENCED): Rename from ATTRIBUTE_CONST,
and use C23 style [[unsequenced]] if available. All uses changed.
---
private.h | 17 ++++++++++++++---
1 file changed, 14 insertions(+), 3 deletions(-)
diff --git a/private.h b/private.h
index 643068a7..4d667aa0 100644
--- a/private.h
+++ b/private.h
@@ -426,11 +426,9 @@ typedef unsigned long uintmax_t;
#endif
#if 3 <= __GNUC__
-# define ATTRIBUTE_CONST __attribute__((const))
# define ATTRIBUTE_MALLOC __attribute__((malloc))
# define ATTRIBUTE_FORMAT(spec) __attribute__((format spec))
#else
-# define ATTRIBUTE_CONST /* empty */
# define ATTRIBUTE_MALLOC /* empty */
# define ATTRIBUTE_FORMAT(spec) /* empty */
#endif
@@ -483,6 +481,19 @@ typedef unsigned long uintmax_t;
# endif
#endif
+#if HAVE_HAS_C_ATTRIBUTE
+# if __has_c_attribute(unsequenced)
+# define ATTRIBUTE_UNSEQUENCED [[unsequenced]]
+# endif
+#endif
+#ifndef ATTRIBUTE_UNSEQUENCED
+# if 3 <= __GNUC__
+# define ATTRIBUTE_UNSEQUENCED __attribute__((const))
+# else
+# define ATTRIBUTE_UNSEQUENCED /* empty */
+# endif
+#endif
+
#if __STDC_VERSION__ < 199901 && !defined restrict
# define restrict /* empty */
#endif
@@ -604,7 +615,7 @@ char *asctime(struct tm const *);
char *asctime_r(struct tm const *restrict, char *restrict);
char *ctime(time_t const *);
char *ctime_r(time_t const *, char *);
-double difftime(time_t, time_t) ATTRIBUTE_CONST;
+double difftime(time_t, time_t) ATTRIBUTE_UNSEQUENCED;
size_t strftime(char *restrict, size_t, char const *restrict,
struct tm const *restrict);
# if HAVE_STRFTIME_L
--
2.37.2
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