115 lines
4.9 KiB
Text
115 lines
4.9 KiB
Text
|
dnl 'extern inline' a la ISO C99.
|
||
|
|
|
||
|
|
dnl Copyright 2012-2021 Free Software Foundation, Inc.
|
||
|
|
dnl This file is free software; the Free Software Foundation
|
||
|
|
dnl gives unlimited permission to copy and/or distribute it,
|
||
|
|
dnl with or without modifications, as long as this notice is preserved.
|
||
|
|
|
||
|
|
AC_DEFUN([gl_EXTERN_INLINE],
|
||
|
|
[
|
||
|
|
AH_VERBATIM([extern_inline],
|
||
|
|
[/* Please see the Gnulib manual for how to use these macros.
|
||
|
|
|
||
|
|
Suppress extern inline with HP-UX cc, as it appears to be broken; see
|
||
|
|
<https://lists.gnu.org/r/bug-texinfo/2013-02/msg00030.html>.
|
||
|
|
|
||
|
|
Suppress extern inline with Sun C in standards-conformance mode, as it
|
||
|
|
mishandles inline functions that call each other. E.g., for 'inline void f
|
||
|
|
(void) { } inline void g (void) { f (); }', c99 incorrectly complains
|
||
|
|
'reference to static identifier "f" in extern inline function'.
|
||
|
|
This bug was observed with Sun C 5.12 SunOS_i386 2011/11/16.
|
||
|
|
|
||
|
|
Suppress extern inline (with or without __attribute__ ((__gnu_inline__)))
|
||
|
|
on configurations that mistakenly use 'static inline' to implement
|
||
|
|
functions or macros in standard C headers like <ctype.h>. For example,
|
||
|
|
if isdigit is mistakenly implemented via a static inline function,
|
||
|
|
a program containing an extern inline function that calls isdigit
|
||
|
|
may not work since the C standard prohibits extern inline functions
|
||
|
|
from calling static functions (ISO C 99 section 6.7.4.(3).
|
||
|
|
This bug is known to occur on:
|
||
|
|
|
||
|
|
OS X 10.8 and earlier; see:
|
||
|
|
https://lists.gnu.org/r/bug-gnulib/2012-12/msg00023.html
|
||
|
|
|
||
|
|
DragonFly; see
|
||
|
|
http://muscles.dragonflybsd.org/bulk/clang-master-potential/20141111_102002/logs/ah-tty-0.3.12.log
|
||
|
|
|
||
|
|
FreeBSD; see:
|
||
|
|
https://lists.gnu.org/r/bug-gnulib/2014-07/msg00104.html
|
||
|
|
|
||
|
|
OS X 10.9 has a macro __header_inline indicating the bug is fixed for C and
|
||
|
|
for clang but remains for g++; see <https://trac.macports.org/ticket/41033>.
|
||
|
|
Assume DragonFly and FreeBSD will be similar.
|
||
|
|
|
||
|
|
GCC 4.3 and above with -std=c99 or -std=gnu99 implements ISO C99
|
||
|
|
inline semantics, unless -fgnu89-inline is used. It defines a macro
|
||
|
|
__GNUC_STDC_INLINE__ to indicate this situation or a macro
|
||
|
|
__GNUC_GNU_INLINE__ to indicate the opposite situation.
|
||
|
|
GCC 4.2 with -std=c99 or -std=gnu99 implements the GNU C inline
|
||
|
|
semantics but warns, unless -fgnu89-inline is used:
|
||
|
|
warning: C99 inline functions are not supported; using GNU89
|
||
|
|
warning: to disable this warning use -fgnu89-inline or the gnu_inline function attribute
|
||
|
|
It defines a macro __GNUC_GNU_INLINE__ to indicate this situation.
|
||
|
|
*/
|
||
|
|
#if (((defined __APPLE__ && defined __MACH__) \
|
||
|
|
|| defined __DragonFly__ || defined __FreeBSD__) \
|
||
|
|
&& (defined __header_inline \
|
||
|
|
? (defined __cplusplus && defined __GNUC_STDC_INLINE__ \
|
||
|
|
&& ! defined __clang__) \
|
||
|
|
: ((! defined _DONT_USE_CTYPE_INLINE_ \
|
||
|
|
&& (defined __GNUC__ || defined __cplusplus)) \
|
||
|
|
|| (defined _FORTIFY_SOURCE && 0 < _FORTIFY_SOURCE \
|
||
|
|
&& defined __GNUC__ && ! defined __cplusplus))))
|
||
|
|
# define _GL_EXTERN_INLINE_STDHEADER_BUG
|
||
|
|
#endif
|
||
|
|
#if ((__GNUC__ \
|
||
|
|
? defined __GNUC_STDC_INLINE__ && __GNUC_STDC_INLINE__ \
|
||
|
|
: (199901L <= __STDC_VERSION__ \
|
||
|
|
&& !defined __HP_cc \
|
||
|
|
&& !defined __PGI \
|
||
|
|
&& !(defined __SUNPRO_C && __STDC__))) \
|
||
|
|
&& !defined _GL_EXTERN_INLINE_STDHEADER_BUG)
|
||
|
|
# define _GL_INLINE inline
|
||
|
|
# define _GL_EXTERN_INLINE extern inline
|
||
|
|
# define _GL_EXTERN_INLINE_IN_USE
|
||
|
|
#elif (2 < __GNUC__ + (7 <= __GNUC_MINOR__) && !defined __STRICT_ANSI__ \
|
||
|
|
&& !defined _GL_EXTERN_INLINE_STDHEADER_BUG)
|
||
|
|
# if defined __GNUC_GNU_INLINE__ && __GNUC_GNU_INLINE__
|
||
|
|
/* __gnu_inline__ suppresses a GCC 4.2 diagnostic. */
|
||
|
|
# define _GL_INLINE extern inline __attribute__ ((__gnu_inline__))
|
||
|
|
# else
|
||
|
|
# define _GL_INLINE extern inline
|
||
|
|
# endif
|
||
|
|
# define _GL_EXTERN_INLINE extern
|
||
|
|
# define _GL_EXTERN_INLINE_IN_USE
|
||
|
|
#else
|
||
|
|
# define _GL_INLINE static _GL_UNUSED
|
||
|
|
# define _GL_EXTERN_INLINE static _GL_UNUSED
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/* In GCC 4.6 (inclusive) to 5.1 (exclusive),
|
||
|
|
suppress bogus "no previous prototype for 'FOO'"
|
||
|
|
and "no previous declaration for 'FOO'" diagnostics,
|
||
|
|
when FOO is an inline function in the header; see
|
||
|
|
<https://gcc.gnu.org/bugzilla/show_bug.cgi?id=54113> and
|
||
|
|
<https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63877>. */
|
||
|
|
#if __GNUC__ == 4 && 6 <= __GNUC_MINOR__
|
||
|
|
# if defined __GNUC_STDC_INLINE__ && __GNUC_STDC_INLINE__
|
||
|
|
# define _GL_INLINE_HEADER_CONST_PRAGMA
|
||
|
|
# else
|
||
|
|
# define _GL_INLINE_HEADER_CONST_PRAGMA \
|
||
|
|
_Pragma ("GCC diagnostic ignored \"-Wsuggest-attribute=const\"")
|
||
|
|
# endif
|
||
|
|
# define _GL_INLINE_HEADER_BEGIN \
|
||
|
|
_Pragma ("GCC diagnostic push") \
|
||
|
|
_Pragma ("GCC diagnostic ignored \"-Wmissing-prototypes\"") \
|
||
|
|
_Pragma ("GCC diagnostic ignored \"-Wmissing-declarations\"") \
|
||
|
|
_GL_INLINE_HEADER_CONST_PRAGMA
|
||
|
|
# define _GL_INLINE_HEADER_END \
|
||
|
|
_Pragma ("GCC diagnostic pop")
|
||
|
|
#else
|
||
|
|
# define _GL_INLINE_HEADER_BEGIN
|
||
|
|
# define _GL_INLINE_HEADER_END
|
||
|
|
#endif])
|
||
|
|
])
|