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annotate m4/strstr.m4 @ 17363:5a51fb7777a9

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sys_select, sys_time: port 2013-01-30 Solaris 2.6 fix to Cygwin Problem reported by Marco Atzeri in <http://lists.gnu.org/archive/html/bug-gnulib/2013-03/msg00000.html>. * lib/sys_select.in.h [HAVE_SYS_SELECT_H && _CYGWIN_SYS_TIME_H]: Simply delegate to the system <sys/select.h> in this case too. Also, pay attention to _GL_SYS_SELECT_H_REDIRECT_FROM_SYS_TIME_H only if OSF/1, since otherwise Cygwin breaks, and it doesn't seem to be needed on Solaris either. * lib/sys_time.in.h [_CYGWIN_SYS_TIME_H]: Simply delgate to the system <sys/time.h> in this case.
author Paul Eggert <eggert@cs.ucla.edu>
date Tue, 19 Mar 2013 09:08:47 -0700
parents e542fd46ad6f
children 344018b6e5d7
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 # strstr.m4 serial 16
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2 dnl Copyright (C) 2008-2013 Free Software Foundation, Inc.
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3 dnl This file is free software; the Free Software Foundation
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4 dnl gives unlimited permission to copy and/or distribute it,
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5 dnl with or without modifications, as long as this notice is preserved.
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6
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7 dnl Check that strstr works.
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8 AC_DEFUN([gl_FUNC_STRSTR_SIMPLE],
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9 [
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10 AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
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11 AC_REQUIRE([gl_FUNC_MEMCHR])
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12 if test "$gl_cv_func_memchr_works" != yes; then
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13 REPLACE_STRSTR=1
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14 else
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15 dnl Detect http://sourceware.org/bugzilla/show_bug.cgi?id=12092.
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16 AC_CACHE_CHECK([whether strstr works],
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17 [gl_cv_func_strstr_works_always],
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18 [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
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19 #include <string.h> /* for strstr */
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20 #define P "_EF_BF_BD"
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21 #define HAYSTACK "F_BD_CE_BD" P P P P "_C3_88_20" P P P "_C3_A7_20" P
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22 #define NEEDLE P P P P P
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23 ]], [[return !!strstr (HAYSTACK, NEEDLE);
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24 ]])],
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25 [gl_cv_func_strstr_works_always=yes],
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26 [gl_cv_func_strstr_works_always=no],
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27 [dnl glibc 2.12 and cygwin 1.7.7 have a known bug. uClibc is not
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28 dnl affected, since it uses different source code for strstr than
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29 dnl glibc.
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30 dnl Assume that it works on all other platforms, even if it is not
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31 dnl linear.
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32 AC_EGREP_CPP([Lucky user],
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33 [
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34 #ifdef __GNU_LIBRARY__
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35 #include <features.h>
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36 #if ((__GLIBC__ == 2 && __GLIBC_MINOR__ > 12) || (__GLIBC__ > 2)) \
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37 || defined __UCLIBC__
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38 Lucky user
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39 #endif
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40 #elif defined __CYGWIN__
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41 #include <cygwin/version.h>
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42 #if CYGWIN_VERSION_DLL_COMBINED > CYGWIN_VERSION_DLL_MAKE_COMBINED (1007, 7)
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44 #endif
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45 #else
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46 Lucky user
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47 #endif
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48 ],
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49 [gl_cv_func_strstr_works_always="guessing yes"],
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50 [gl_cv_func_strstr_works_always="guessing no"])
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51 ])
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52 ])
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53 case "$gl_cv_func_strstr_works_always" in
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54 *yes) ;;
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55 *)
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56 REPLACE_STRSTR=1
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57 ;;
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58 esac
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59 fi
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60 ]) # gl_FUNC_STRSTR_SIMPLE
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61
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62 dnl Additionally, check that strstr is efficient.
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63 AC_DEFUN([gl_FUNC_STRSTR],
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64 [
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65 AC_REQUIRE([gl_FUNC_STRSTR_SIMPLE])
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66 if test $REPLACE_STRSTR = 0; then
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67 AC_CACHE_CHECK([whether strstr works in linear time],
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68 [gl_cv_func_strstr_linear],
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69 [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
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70 #include <signal.h> /* for signal */
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71 #include <string.h> /* for strstr */
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72 #include <stdlib.h> /* for malloc */
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73 #include <unistd.h> /* for alarm */
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74 static void quit (int sig) { exit (sig + 128); }
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75 ]], [[
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76 int result = 0;
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77 size_t m = 1000000;
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78 char *haystack = (char *) malloc (2 * m + 2);
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79 char *needle = (char *) malloc (m + 2);
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80 /* Failure to compile this test due to missing alarm is okay,
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81 since all such platforms (mingw) also have quadratic strstr. */
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82 signal (SIGALRM, quit);
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83 alarm (5);
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84 /* Check for quadratic performance. */
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85 if (haystack && needle)
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86 {
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87 memset (haystack, 'A', 2 * m);
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88 haystack[2 * m] = 'B';
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89 haystack[2 * m + 1] = 0;
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90 memset (needle, 'A', m);
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91 needle[m] = 'B';
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92 needle[m + 1] = 0;
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93 if (!strstr (haystack, needle))
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94 result |= 1;
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95 }
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96 return result;
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97 ]])],
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98 [gl_cv_func_strstr_linear=yes], [gl_cv_func_strstr_linear=no],
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99 [dnl Only glibc > 2.12 on processors without SSE 4.2 instructions and
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100 dnl cygwin > 1.7.7 are known to have a bug-free strstr that works in
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101 dnl linear time.
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102 AC_EGREP_CPP([Lucky user],
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103 [
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104 #include <features.h>
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105 #ifdef __GNU_LIBRARY__
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106 #if ((__GLIBC__ == 2 && __GLIBC_MINOR__ > 12) || (__GLIBC__ > 2)) \
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107 && !(defined __i386__ || defined __x86_64__) \
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108 && !defined __UCLIBC__
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109 Lucky user
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110 #endif
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111 #endif
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112 #ifdef __CYGWIN__
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113 #include <cygwin/version.h>
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114 #if CYGWIN_VERSION_DLL_COMBINED > CYGWIN_VERSION_DLL_MAKE_COMBINED (1007, 7)
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115 Lucky user
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116 #endif
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117 #endif
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118 ],
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119 [gl_cv_func_strstr_linear="guessing yes"],
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120 [gl_cv_func_strstr_linear="guessing no"])
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121 ])
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122 ])
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123 case "$gl_cv_func_strstr_linear" in
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124 *yes) ;;
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125 *)
ca49e9a6643d Say "guessing yes" or "guessing no" when cross-compiling.
Bruno Haible <bruno@clisp.org>
parents: 16201
diff changeset
126 REPLACE_STRSTR=1
ca49e9a6643d Say "guessing yes" or "guessing no" when cross-compiling.
Bruno Haible <bruno@clisp.org>
parents: 16201
diff changeset
127 ;;
ca49e9a6643d Say "guessing yes" or "guessing no" when cross-compiling.
Bruno Haible <bruno@clisp.org>
parents: 16201
diff changeset
128 esac
9600
99268e709d31 Avoid quadratic strstr implementations.
Eric Blake <ebb9@byu.net>
parents:
diff changeset
129 fi
9605
e9c53ef3c622 * m4/strstr.m4: Delete cruft from copy-n-paste.
Eric Blake <ebb9@byu.net>
parents: 9600
diff changeset
130 ]) # gl_FUNC_STRSTR