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  1. dnl 'extern inline' a la ISO C99.
  2. dnl Copyright 2012-2016 Free Software Foundation, Inc.
  3. dnl This file is free software; the Free Software Foundation
  4. dnl gives unlimited permission to copy and/or distribute it,
  5. dnl with or without modifications, as long as this notice is preserved.
  6. AC_DEFUN([gl_EXTERN_INLINE],
  7. [
  8. AH_VERBATIM([extern_inline],
  9. [/* Please see the Gnulib manual for how to use these macros.
  10. Suppress extern inline with HP-UX cc, as it appears to be broken; see
  11. <http://lists.gnu.org/archive/html/bug-texinfo/2013-02/msg00030.html>.
  12. Suppress extern inline with Sun C in standards-conformance mode, as it
  13. mishandles inline functions that call each other. E.g., for 'inline void f
  14. (void) { } inline void g (void) { f (); }', c99 incorrectly complains
  15. 'reference to static identifier "f" in extern inline function'.
  16. This bug was observed with Sun C 5.12 SunOS_i386 2011/11/16.
  17. Suppress extern inline (with or without __attribute__ ((__gnu_inline__)))
  18. on configurations that mistakenly use 'static inline' to implement
  19. functions or macros in standard C headers like <ctype.h>. For example,
  20. if isdigit is mistakenly implemented via a static inline function,
  21. a program containing an extern inline function that calls isdigit
  22. may not work since the C standard prohibits extern inline functions
  23. from calling static functions. This bug is known to occur on:
  24. OS X 10.8 and earlier; see:
  25. http://lists.gnu.org/archive/html/bug-gnulib/2012-12/msg00023.html
  26. DragonFly; see
  27. http://muscles.dragonflybsd.org/bulk/bleeding-edge-potential/latest-per-pkg/ah-tty-0.3.12.log
  28. FreeBSD; see:
  29. http://lists.gnu.org/archive/html/bug-gnulib/2014-07/msg00104.html
  30. OS X 10.9 has a macro __header_inline indicating the bug is fixed for C and
  31. for clang but remains for g++; see <http://trac.macports.org/ticket/41033>.
  32. Assume DragonFly and FreeBSD will be similar. */
  33. #if (((defined __APPLE__ && defined __MACH__) \
  34. || defined __DragonFly__ || defined __FreeBSD__) \
  35. && (defined __header_inline \
  36. ? (defined __cplusplus && defined __GNUC_STDC_INLINE__ \
  37. && ! defined __clang__) \
  38. : ((! defined _DONT_USE_CTYPE_INLINE_ \
  39. && (defined __GNUC__ || defined __cplusplus)) \
  40. || (defined _FORTIFY_SOURCE && 0 < _FORTIFY_SOURCE \
  41. && defined __GNUC__ && ! defined __cplusplus))))
  42. # define _GL_EXTERN_INLINE_STDHEADER_BUG
  43. #endif
  44. #if ((__GNUC__ \
  45. ? defined __GNUC_STDC_INLINE__ && __GNUC_STDC_INLINE__ \
  46. : (199901L <= __STDC_VERSION__ \
  47. && !defined __HP_cc \
  48. && !defined __PGI \
  49. && !(defined __SUNPRO_C && __STDC__))) \
  50. && !defined _GL_EXTERN_INLINE_STDHEADER_BUG)
  51. # define _GL_INLINE inline
  52. # define _GL_EXTERN_INLINE extern inline
  53. # define _GL_EXTERN_INLINE_IN_USE
  54. #elif (2 < __GNUC__ + (7 <= __GNUC_MINOR__) && !defined __STRICT_ANSI__ \
  55. && !defined _GL_EXTERN_INLINE_STDHEADER_BUG)
  56. # if defined __GNUC_GNU_INLINE__ && __GNUC_GNU_INLINE__
  57. /* __gnu_inline__ suppresses a GCC 4.2 diagnostic. */
  58. # define _GL_INLINE extern inline __attribute__ ((__gnu_inline__))
  59. # else
  60. # define _GL_INLINE extern inline
  61. # endif
  62. # define _GL_EXTERN_INLINE extern
  63. # define _GL_EXTERN_INLINE_IN_USE
  64. #else
  65. # define _GL_INLINE static _GL_UNUSED
  66. # define _GL_EXTERN_INLINE static _GL_UNUSED
  67. #endif
  68. /* In GCC 4.6 (inclusive) to 5.1 (exclusive),
  69. suppress bogus "no previous prototype for 'FOO'"
  70. and "no previous declaration for 'FOO'" diagnostics,
  71. when FOO is an inline function in the header; see
  72. <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=54113> and
  73. <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63877>. */
  74. #if __GNUC__ == 4 && 6 <= __GNUC_MINOR__
  75. # if defined __GNUC_STDC_INLINE__ && __GNUC_STDC_INLINE__
  76. # define _GL_INLINE_HEADER_CONST_PRAGMA
  77. # else
  78. # define _GL_INLINE_HEADER_CONST_PRAGMA \
  79. _Pragma ("GCC diagnostic ignored \"-Wsuggest-attribute=const\"")
  80. # endif
  81. # define _GL_INLINE_HEADER_BEGIN \
  82. _Pragma ("GCC diagnostic push") \
  83. _Pragma ("GCC diagnostic ignored \"-Wmissing-prototypes\"") \
  84. _Pragma ("GCC diagnostic ignored \"-Wmissing-declarations\"") \
  85. _GL_INLINE_HEADER_CONST_PRAGMA
  86. # define _GL_INLINE_HEADER_END \
  87. _Pragma ("GCC diagnostic pop")
  88. #else
  89. # define _GL_INLINE_HEADER_BEGIN
  90. # define _GL_INLINE_HEADER_END
  91. #endif])
  92. ])