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annotate m4/extern-inline.m4 @ 17330:6f8d1926ece8

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extern-inline: avoid compilation error with HP-UX cc Reported by Richard Lloyd in <http://lists.gnu.org/archive/html/bug-texinfo/2013-02/msg00030.html>. * m4/extern-inline.m4 (_GL_INLINE, _GL_EXTERN_INLINE): Suppress extern inline with HP-UX cc. This should be safe, though it may hurt performance. Perhaps someone with some HP-UX experience can come up with a higher-performance fix.
author Paul Eggert <eggert@cs.ucla.edu>
date Mon, 18 Feb 2013 17:16:30 -0800
parents e542fd46ad6f
children f9ba1e745bd9
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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 [/* _GL_INLINE is a portable alternative to ISO C99 plain 'inline'.
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12 _GL_EXTERN_INLINE is a portable alternative to 'extern inline'.
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13 _GL_INLINE_HEADER_BEGIN contains useful stuff to put
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14 in an include file, before uses of _GL_INLINE.
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15 It suppresses GCC's bogus "no previous prototype for 'FOO'" diagnostic,
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16 when FOO is an inline function in the header; see
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17 <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54113>.
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18 _GL_INLINE_HEADER_END contains useful stuff to put
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19 in the same include file, after uses of _GL_INLINE.
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20
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21 Suppress extern inline with HP-UX cc, as it appears to be broken; see
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22 <http://lists.gnu.org/archive/html/bug-texinfo/2013-02/msg00030.html>.
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23
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24 Suppress the use of extern inline on Apple's platforms,
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25 as Libc-825.25 (2012-09-19) is incompatible with it; see
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26 <http://lists.gnu.org/archive/html/bug-gnulib/2012-12/msg00023.html>.
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27 Perhaps Apple will fix this some day. */
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28 #if ((__GNUC__ \
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29 ? defined __GNUC_STDC_INLINE__ && __GNUC_STDC_INLINE__ \
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30 : 199901L <= __STDC_VERSION__ && !defined __HP_cc) \
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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 __APPLE__
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35 # if __GNUC_GNU_INLINE__
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36 /* __gnu_inline__ suppresses a GCC 4.2 diagnostic. */
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37 # define _GL_INLINE extern inline __attribute__ ((__gnu_inline__))
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38 # else
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39 # define _GL_INLINE extern inline
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40 # endif
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41 # define _GL_EXTERN_INLINE extern
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42 #else
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43 # define _GL_INLINE static _GL_UNUSED
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44 # define _GL_EXTERN_INLINE static _GL_UNUSED
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45 #endif
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46
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47 #if 4 < __GNUC__ + (6 <= __GNUC_MINOR__)
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48 # if defined __GNUC_STDC_INLINE__ && __GNUC_STDC_INLINE__
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49 # define _GL_INLINE_HEADER_CONST_PRAGMA
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50 # else
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51 # define _GL_INLINE_HEADER_CONST_PRAGMA \
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52 _Pragma ("GCC diagnostic ignored \"-Wsuggest-attribute=const\"")
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53 # endif
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54 # define _GL_INLINE_HEADER_BEGIN \
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55 _Pragma ("GCC diagnostic push") \
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56 _Pragma ("GCC diagnostic ignored \"-Wmissing-prototypes\"") \
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57 _Pragma ("GCC diagnostic ignored \"-Wmissing-declarations\"") \
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58 _GL_INLINE_HEADER_CONST_PRAGMA
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59 # define _GL_INLINE_HEADER_END \
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60 _Pragma ("GCC diagnostic pop")
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61 #else
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62 # define _GL_INLINE_HEADER_BEGIN
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63 # define _GL_INLINE_HEADER_END
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64 #endif])
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65 ])