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annotate m4/extern-inline.m4 @ 37229:8cabe46c47b3

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extern-inline: port better to OS X 10.9 * m4/extern-inline.m4: Omit serial number; this file doesn't use them. (gl_EXTERN_INLINE): Do not suppress the use of extern inline on OS X 10.9, except for g++ where the bug is still present. See <http://trac.macports.org/ticket/41033>.
author Paul Eggert <eggert@cs.ucla.edu>
date Fri, 08 Nov 2013 07:57:15 -0800
parents 1eb5f45967c9
children 344018b6e5d7
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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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12
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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 problematic Apple configurations.
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23 OS X 10.8 and earlier mishandle 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 OS X 10.9 has a macro __header_inline indicating the bug is fixed for C and
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26 for clang but remains for g++; see <http://trac.macports.org/ticket/41033>.
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27 Perhaps Apple will fix this some day. */
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28 #if (defined __APPLE__ \
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29 && (defined __header_inline \
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30 ? (defined __cplusplus && defined __GNUC_STDC_INLINE__ \
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31 && ! defined __clang__) \
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32 : ((! defined _DONT_USE_CTYPE_INLINE_ \
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33 && (defined __GNUC__ || defined __cplusplus)) \
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34 || (defined _FORTIFY_SOURCE && 0 < _FORTIFY_SOURCE \
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35 && defined __GNUC__ && ! defined __cplusplus))))
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36 # define _GL_EXTERN_INLINE_APPLE_BUG
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37 #endif
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38 #if ((__GNUC__ \
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39 ? defined __GNUC_STDC_INLINE__ && __GNUC_STDC_INLINE__ \
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40 : (199901L <= __STDC_VERSION__ \
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41 && !defined __HP_cc \
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42 && !(defined __SUNPRO_C && __STDC__))) \
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43 && !defined _GL_EXTERN_INLINE_APPLE_BUG)
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44 # define _GL_INLINE inline
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45 # define _GL_EXTERN_INLINE extern inline
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46 # define _GL_EXTERN_INLINE_IN_USE
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47 #elif (2 < __GNUC__ + (7 <= __GNUC_MINOR__) && !defined __STRICT_ANSI__ \
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48 && !defined _GL_EXTERN_INLINE_APPLE_BUG)
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49 # if defined __GNUC_GNU_INLINE__ && __GNUC_GNU_INLINE__
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50 /* __gnu_inline__ suppresses a GCC 4.2 diagnostic. */
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51 # define _GL_INLINE extern inline __attribute__ ((__gnu_inline__))
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52 # else
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53 # define _GL_INLINE extern inline
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54 # endif
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55 # define _GL_EXTERN_INLINE extern
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56 # define _GL_EXTERN_INLINE_IN_USE
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57 #else
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58 # define _GL_INLINE static _GL_UNUSED
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59 # define _GL_EXTERN_INLINE static _GL_UNUSED
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60 #endif
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61
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62 #if 4 < __GNUC__ + (6 <= __GNUC_MINOR__)
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63 # if defined __GNUC_STDC_INLINE__ && __GNUC_STDC_INLINE__
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64 # define _GL_INLINE_HEADER_CONST_PRAGMA
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65 # else
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66 # define _GL_INLINE_HEADER_CONST_PRAGMA \
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67 _Pragma ("GCC diagnostic ignored \"-Wsuggest-attribute=const\"")
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68 # endif
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69 /* Suppress GCC's bogus "no previous prototype for 'FOO'"
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70 and "no previous declaration for 'FOO'" diagnostics,
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71 when FOO is an inline function in the header; see
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72 <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54113>. */
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73 # define _GL_INLINE_HEADER_BEGIN \
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74 _Pragma ("GCC diagnostic push") \
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75 _Pragma ("GCC diagnostic ignored \"-Wmissing-prototypes\"") \
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76 _Pragma ("GCC diagnostic ignored \"-Wmissing-declarations\"") \
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77 _GL_INLINE_HEADER_CONST_PRAGMA
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78 # define _GL_INLINE_HEADER_END \
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79 _Pragma ("GCC diagnostic pop")
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80 #else
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81 # define _GL_INLINE_HEADER_BEGIN
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82 # define _GL_INLINE_HEADER_END
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83 #endif])
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84 ])