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annotate m4/extern-inline.m4 @ 17436:54c2b89ac5ec

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extern-inline: port to gcc -std=c89 * m4/extern-inline.m4 (gl_EXTERN_INLINE): Do not use __gnu_inline__ if pedantic and pre-C99.
author Paul Eggert <eggert@cs.ucla.edu>
date Fri, 21 Jun 2013 12:33:40 -0700
parents a0d0b52b7d06
children
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1 dnl 'extern inline' a la ISO C99.
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2
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3 dnl Copyright 2012-2013 Free Software Foundation, Inc.
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4 dnl This file is free software; the Free Software Foundation
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5 dnl gives unlimited permission to copy and/or distribute it,
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6 dnl with or without modifications, as long as this notice is preserved.
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7
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8 AC_DEFUN([gl_EXTERN_INLINE],
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9 [
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10 AH_VERBATIM([extern_inline],
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11 [/* Please see the Gnulib manual for how to use these macros.
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13 Suppress extern inline with HP-UX cc, as it appears to be broken; see
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14 <http://lists.gnu.org/archive/html/bug-texinfo/2013-02/msg00030.html>.
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15
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16 Suppress extern inline with Sun C in standards-conformance mode, as it
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17 mishandles inline functions that call each other. E.g., for 'inline void f
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18 (void) { } inline void g (void) { f (); }', c99 incorrectly complains
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19 'reference to static identifier "f" in extern inline function'.
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20 This bug was observed with Sun C 5.12 SunOS_i386 2011/11/16.
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21
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22 Suppress the use of extern inline on Apple's platforms, as Libc at least
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23 through Libc-825.26 (2013-04-09) is incompatible with it; see, e.g.,
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24 <http://lists.gnu.org/archive/html/bug-gnulib/2012-12/msg00023.html>.
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25 Perhaps Apple will fix this some day. */
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26 #if ((__GNUC__ \
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27 ? defined __GNUC_STDC_INLINE__ && __GNUC_STDC_INLINE__ \
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28 : (199901L <= __STDC_VERSION__ \
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29 && !defined __HP_cc \
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30 && !(defined __SUNPRO_C && __STDC__))) \
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31 && !defined __APPLE__)
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32 # define _GL_INLINE inline
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33 # define _GL_EXTERN_INLINE extern inline
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34 #elif (2 < __GNUC__ + (7 <= __GNUC_MINOR__) && !defined __STRICT_ANSI__ \
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35 && !defined __APPLE__)
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36 # if __GNUC_GNU_INLINE__
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37 /* __gnu_inline__ suppresses a GCC 4.2 diagnostic. */
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38 # define _GL_INLINE extern inline __attribute__ ((__gnu_inline__))
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39 # else
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40 # define _GL_INLINE extern inline
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41 # endif
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42 # define _GL_EXTERN_INLINE extern
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43 #else
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44 # define _GL_INLINE static _GL_UNUSED
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45 # define _GL_EXTERN_INLINE static _GL_UNUSED
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46 #endif
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47
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48 #if 4 < __GNUC__ + (6 <= __GNUC_MINOR__)
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49 # if defined __GNUC_STDC_INLINE__ && __GNUC_STDC_INLINE__
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50 # define _GL_INLINE_HEADER_CONST_PRAGMA
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51 # else
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52 # define _GL_INLINE_HEADER_CONST_PRAGMA \
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53 _Pragma ("GCC diagnostic ignored \"-Wsuggest-attribute=const\"")
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54 # endif
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55 /* Suppress GCC's bogus "no previous prototype for 'FOO'"
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56 and "no previous declaration for 'FOO'" diagnostics,
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57 when FOO is an inline function in the header; see
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58 <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54113>. */
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59 # define _GL_INLINE_HEADER_BEGIN \
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60 _Pragma ("GCC diagnostic push") \
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61 _Pragma ("GCC diagnostic ignored \"-Wmissing-prototypes\"") \
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62 _Pragma ("GCC diagnostic ignored \"-Wmissing-declarations\"") \
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63 _GL_INLINE_HEADER_CONST_PRAGMA
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64 # define _GL_INLINE_HEADER_END \
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65 _Pragma ("GCC diagnostic pop")
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66 #else
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67 # define _GL_INLINE_HEADER_BEGIN
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68 # define _GL_INLINE_HEADER_END
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69 #endif])
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70 ])