X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=m4%2Fextern-inline.m4;h=3661cbda5edc84f48e41cfe630630f06bb717d93;hb=92249085071a973e2c0621b0415b93d2e48bb00d;hp=94b46dde07d270866593e99786df06ee9ce698f2;hpb=d738e90e8360e101b94fca8c79147f59565f62d8;p=debian%2Fgzip diff --git a/m4/extern-inline.m4 b/m4/extern-inline.m4 index 94b46dd..3661cbd 100644 --- a/m4/extern-inline.m4 +++ b/m4/extern-inline.m4 @@ -1,6 +1,6 @@ dnl 'extern inline' a la ISO C99. -dnl Copyright 2012-2013 Free Software Foundation, Inc. +dnl Copyright 2012-2018 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. @@ -8,18 +8,10 @@ dnl with or without modifications, as long as this notice is preserved. AC_DEFUN([gl_EXTERN_INLINE], [ AH_VERBATIM([extern_inline], -[/* _GL_INLINE is a portable alternative to ISO C99 plain 'inline'. - _GL_EXTERN_INLINE is a portable alternative to 'extern inline'. - _GL_INLINE_HEADER_BEGIN contains useful stuff to put - in an include file, before uses of _GL_INLINE. - It suppresses GCC's bogus "no previous prototype for 'FOO'" diagnostic, - when FOO is an inline function in the header; see - . - _GL_INLINE_HEADER_END contains useful stuff to put - in the same include file, after uses of _GL_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 - . + . 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 @@ -27,32 +19,81 @@ 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 Apple's platforms, as Libc at least - through Libc-825.26 (2013-04-09) is incompatible with it; see, e.g., - . - Perhaps Apple will fix this some day. */ + 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 . 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/bleeding-edge-potential/latest-per-pkg/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 . + 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 __APPLE__) + && !defined _GL_EXTERN_INLINE_STDHEADER_BUG) # define _GL_INLINE inline # define _GL_EXTERN_INLINE extern inline -#elif 2 < __GNUC__ + (7 <= __GNUC_MINOR__) && !defined __APPLE__ -# if __GNUC_GNU_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 -#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 + and + . */ +#if __GNUC__ == 4 && 6 <= __GNUC_MINOR__ # if defined __GNUC_STDC_INLINE__ && __GNUC_STDC_INLINE__ # define _GL_INLINE_HEADER_CONST_PRAGMA # else