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c: port YY_ATTRIBUTE_UNUSED to Sun C 5.12

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Sun C 5.12 defines __SUNPRO_C to 0x5120 but diagnoses
‘__attribute__ ((__unused__))’.  Change the ifdefs to use
the same method as Gnulib in this area.
* data/skeletons/c.m4 (YY_ATTRIBUTE): Remove, since
not all attributes were added in the same compiler version.
(YY_ATTRIBUTE_PURE, YY_ATTRIBUTE_UNUSED):
Use specific GCC version for each attribute.
Pay no attention to __SUNPRO_C.
* tests/headers.at (Several parsers): Tighten tests accordingly.
This commit is contained in:
Paul Eggert
2019-10-17 11:28:38 -07:00
parent 7a557ee7fe
commit 83c9051a64
2 changed files with 10 additions and 12 deletions
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20
data/skeletons/c.m4
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@@ -282,22 +282,20 @@ m4_define([b4_table_value_equals],
# Provide portable compiler "attributes". If "noreturn" is passed, define
# _Noreturn.
m4_define([b4_attribute_define],
[[#ifndef YY_ATTRIBUTE
# if (defined __GNUC__ \
&& (2 < __GNUC__ || (__GNUC__ == 2 && 96 <= __GNUC_MINOR__))) \
|| defined __SUNPRO_C && 0x5110 <= __SUNPRO_C
# define YY_ATTRIBUTE(Spec) __attribute__(Spec)
[[#ifndef YY_ATTRIBUTE_PURE
# if defined __GNUC__ && 2 < __GNUC__ + (96 <= __GNUC_MINOR__)
# define YY_ATTRIBUTE_PURE __attribute__ ((__pure__))
# else
# define YY_ATTRIBUTE(Spec) /* empty */
# define YY_ATTRIBUTE_PURE
# endif
#endif
#ifndef YY_ATTRIBUTE_PURE
# define YY_ATTRIBUTE_PURE YY_ATTRIBUTE ((__pure__))
#endif
#ifndef YY_ATTRIBUTE_UNUSED
# define YY_ATTRIBUTE_UNUSED YY_ATTRIBUTE ((__unused__))
# if defined __GNUC__ && 2 < __GNUC__ + (7 <= __GNUC_MINOR__)
# define YY_ATTRIBUTE_UNUSED __attribute__ ((__unused__))
# else
# define YY_ATTRIBUTE_UNUSED
# endif
#endif
]m4_bmatch([$1], [\bnoreturn\b], [[/* The _Noreturn keyword of C11. */