nexmon – Blame information for rev 1
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1 | office | 1 | # serial 10 -*- Autoconf -*- |
2 | # Enable extensions on systems that normally disable them. |
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3 | |||
4 | # Copyright (C) 2003, 2006-2011 Free Software Foundation, Inc. |
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5 | # This file is free software; the Free Software Foundation |
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6 | # gives unlimited permission to copy and/or distribute it, |
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7 | # with or without modifications, as long as this notice is preserved. |
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8 | |||
9 | # This definition of AC_USE_SYSTEM_EXTENSIONS is stolen from CVS |
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10 | # Autoconf. Perhaps we can remove this once we can assume Autoconf |
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11 | # 2.62 or later everywhere, but since CVS Autoconf mutates rapidly |
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12 | # enough in this area it's likely we'll need to redefine |
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13 | # AC_USE_SYSTEM_EXTENSIONS for quite some time. |
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14 | |||
15 | # If autoconf reports a warning |
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16 | # warning: AC_COMPILE_IFELSE was called before AC_USE_SYSTEM_EXTENSIONS |
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17 | # or warning: AC_RUN_IFELSE was called before AC_USE_SYSTEM_EXTENSIONS |
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18 | # the fix is |
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19 | # 1) to ensure that AC_USE_SYSTEM_EXTENSIONS is never directly invoked |
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20 | # but always AC_REQUIREd, |
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21 | # 2) to ensure that for each occurrence of |
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22 | # AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS]) |
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23 | # or |
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24 | # AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) |
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25 | # the corresponding gnulib module description has 'extensions' among |
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26 | # its dependencies. This will ensure that the gl_USE_SYSTEM_EXTENSIONS |
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27 | # invocation occurs in gl_EARLY, not in gl_INIT. |
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28 | |||
29 | # AC_USE_SYSTEM_EXTENSIONS |
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30 | # ------------------------ |
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31 | # Enable extensions on systems that normally disable them, |
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32 | # typically due to standards-conformance issues. |
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33 | # Remember that #undef in AH_VERBATIM gets replaced with #define by |
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34 | # AC_DEFINE. The goal here is to define all known feature-enabling |
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35 | # macros, then, if reports of conflicts are made, disable macros that |
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36 | # cause problems on some platforms (such as __EXTENSIONS__). |
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37 | AC_DEFUN_ONCE([AC_USE_SYSTEM_EXTENSIONS], |
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38 | [AC_BEFORE([$0], [AC_COMPILE_IFELSE])dnl |
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39 | AC_BEFORE([$0], [AC_RUN_IFELSE])dnl |
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40 | |||
41 | AC_REQUIRE([AC_CANONICAL_HOST]) |
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42 | |||
43 | AC_CHECK_HEADER([minix/config.h], [MINIX=yes], [MINIX=]) |
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44 | if test "$MINIX" = yes; then |
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45 | AC_DEFINE([_POSIX_SOURCE], [1], |
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46 | [Define to 1 if you need to in order for `stat' and other |
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47 | things to work.]) |
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48 | AC_DEFINE([_POSIX_1_SOURCE], [2], |
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49 | [Define to 2 if the system does not provide POSIX.1 features |
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50 | except with this defined.]) |
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51 | AC_DEFINE([_MINIX], [1], |
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52 | [Define to 1 if on MINIX.]) |
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53 | fi |
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54 | |||
55 | dnl HP-UX 11.11 defines mbstate_t only if _XOPEN_SOURCE is defined to 500, |
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56 | dnl regardless of whether the flags -Ae or _D_HPUX_SOURCE=1 are already |
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57 | dnl provided. |
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58 | case "$host_os" in |
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59 | hpux*) |
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60 | AC_DEFINE([_XOPEN_SOURCE], [500], |
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61 | [Define to 500 only on HP-UX.]) |
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62 | ;; |
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63 | esac |
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64 | |||
65 | AH_VERBATIM([__EXTENSIONS__], |
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66 | [/* Enable extensions on AIX 3, Interix. */ |
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67 | #ifndef _ALL_SOURCE |
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68 | # undef _ALL_SOURCE |
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69 | #endif |
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70 | /* Enable general extensions on MacOS X. */ |
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71 | #ifndef _DARWIN_C_SOURCE |
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72 | # undef _DARWIN_C_SOURCE |
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73 | #endif |
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74 | /* Enable GNU extensions on systems that have them. */ |
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75 | #ifndef _GNU_SOURCE |
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76 | # undef _GNU_SOURCE |
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77 | #endif |
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78 | /* Enable threading extensions on Solaris. */ |
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79 | #ifndef _POSIX_PTHREAD_SEMANTICS |
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80 | # undef _POSIX_PTHREAD_SEMANTICS |
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81 | #endif |
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82 | /* Enable extensions on HP NonStop. */ |
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83 | #ifndef _TANDEM_SOURCE |
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84 | # undef _TANDEM_SOURCE |
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85 | #endif |
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86 | /* Enable general extensions on Solaris. */ |
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87 | #ifndef __EXTENSIONS__ |
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88 | # undef __EXTENSIONS__ |
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89 | #endif |
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90 | ]) |
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91 | AC_CACHE_CHECK([whether it is safe to define __EXTENSIONS__], |
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92 | [ac_cv_safe_to_define___extensions__], |
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93 | [AC_COMPILE_IFELSE( |
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94 | [AC_LANG_PROGRAM([[ |
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95 | # define __EXTENSIONS__ 1 |
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96 | ]AC_INCLUDES_DEFAULT])], |
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97 | [ac_cv_safe_to_define___extensions__=yes], |
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98 | [ac_cv_safe_to_define___extensions__=no])]) |
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99 | test $ac_cv_safe_to_define___extensions__ = yes && |
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100 | AC_DEFINE([__EXTENSIONS__]) |
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101 | AC_DEFINE([_ALL_SOURCE]) |
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102 | AC_DEFINE([_DARWIN_C_SOURCE]) |
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103 | AC_DEFINE([_GNU_SOURCE]) |
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104 | AC_DEFINE([_POSIX_PTHREAD_SEMANTICS]) |
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105 | AC_DEFINE([_TANDEM_SOURCE]) |
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106 | ])# AC_USE_SYSTEM_EXTENSIONS |
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107 | |||
108 | # gl_USE_SYSTEM_EXTENSIONS |
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109 | # ------------------------ |
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110 | # Enable extensions on systems that normally disable them, |
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111 | # typically due to standards-conformance issues. |
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112 | AC_DEFUN_ONCE([gl_USE_SYSTEM_EXTENSIONS], |
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113 | [ |
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114 | dnl Require this macro before AC_USE_SYSTEM_EXTENSIONS. |
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115 | dnl gnulib does not need it. But if it gets required by third-party macros |
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116 | dnl after AC_USE_SYSTEM_EXTENSIONS is required, autoconf 2.62..2.63 emit a |
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117 | dnl warning: "AC_COMPILE_IFELSE was called before AC_USE_SYSTEM_EXTENSIONS". |
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118 | dnl Note: We can do this only for one of the macros AC_AIX, AC_GNU_SOURCE, |
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119 | dnl AC_MINIX. If people still use AC_AIX or AC_MINIX, they are out of luck. |
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120 | AC_REQUIRE([AC_GNU_SOURCE]) |
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121 | |||
122 | AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS]) |
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123 | ]) |