diff options
Diffstat (limited to 'm4/extern-inline.m4')
| -rw-r--r-- | m4/extern-inline.m4 | 45 |
1 files changed, 31 insertions, 14 deletions
diff --git a/m4/extern-inline.m4 b/m4/extern-inline.m4 index 240150efb..72800650e 100644 --- a/m4/extern-inline.m4 +++ b/m4/extern-inline.m4 @@ -1,6 +1,6 @@ dnl 'extern inline' a la ISO C99. -dnl Copyright 2012-2014 Free Software Foundation, Inc. +dnl Copyright 2012-2015 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. @@ -19,13 +19,28 @@ AC_DEFUN([gl_EXTERN_INLINE], 'reference to static identifier "f" in extern inline function'. This bug was observed with Sun C 5.12 SunOS_i386 2011/11/16. - Suppress the use of extern inline on problematic Apple configurations. - OS X 10.8 and earlier mishandle it; see, e.g., - <http://lists.gnu.org/archive/html/bug-gnulib/2012-12/msg00023.html>. + 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. This bug is known to occur on: + + OS X 10.8 and earlier; see: + http://lists.gnu.org/archive/html/bug-gnulib/2012-12/msg00023.html + + DragonFly; see + http://muscles.dragonflybsd.org/bulk/bleeding-edge-potential/latest-per-pkg/ah-tty-0.3.12.log + + FreeBSD; see: + http://lists.gnu.org/archive/html/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 <http://trac.macports.org/ticket/41033>. - Perhaps Apple will fix this some day. */ -#if (defined __APPLE__ \ + Assume DragonFly and FreeBSD will be similar. */ +#if (((defined __APPLE__ && defined __MACH__) \ + || defined __DragonFly__ || defined __FreeBSD__) \ && (defined __header_inline \ ? (defined __cplusplus && defined __GNUC_STDC_INLINE__ \ && ! defined __clang__) \ @@ -33,19 +48,19 @@ AC_DEFUN([gl_EXTERN_INLINE], && (defined __GNUC__ || defined __cplusplus)) \ || (defined _FORTIFY_SOURCE && 0 < _FORTIFY_SOURCE \ && defined __GNUC__ && ! defined __cplusplus)))) -# define _GL_EXTERN_INLINE_APPLE_BUG +# define _GL_EXTERN_INLINE_STDHEADER_BUG #endif #if ((__GNUC__ \ ? defined __GNUC_STDC_INLINE__ && __GNUC_STDC_INLINE__ \ : (199901L <= __STDC_VERSION__ \ && !defined __HP_cc \ && !(defined __SUNPRO_C && __STDC__))) \ - && !defined _GL_EXTERN_INLINE_APPLE_BUG) + && !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_APPLE_BUG) + && !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__)) @@ -59,17 +74,19 @@ AC_DEFUN([gl_EXTERN_INLINE], # define _GL_EXTERN_INLINE static _GL_UNUSED #endif -#if 4 < __GNUC__ + (6 <= __GNUC_MINOR__) +/* 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 - /* Suppress GCC's bogus "no previous prototype for 'FOO'" - and "no previous declaration for 'FOO'" diagnostics, - when FOO is an inline function in the header; see - <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54113>. */ # define _GL_INLINE_HEADER_BEGIN \ _Pragma ("GCC diagnostic push") \ _Pragma ("GCC diagnostic ignored \"-Wmissing-prototypes\"") \ |