maint: update copyright

[gnulib.git] / m4 / strstr.m4

diff --git a/m4/strstr.m4 b/m4/strstr.m4
index 258ae5f..33cd7a3 100644 (file)
--- a/m4/strstr.m4
+++ b/m4/strstr.m4
@@ -1,5 +1,5 @@
-# strstr.m4 serial 11
-dnl Copyright (C) 2008, 2009, 2010 Free Software Foundation, Inc.
+# strstr.m4 serial 16
+dnl Copyright (C) 2008-2014 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
@@ -11,7 +11,6 @@ AC_DEFUN([gl_FUNC_STRSTR_SIMPLE],
   AC_REQUIRE([gl_FUNC_MEMCHR])
   if test "$gl_cv_func_memchr_works" != yes; then
     REPLACE_STRSTR=1
-    AC_LIBOBJ([strstr])
   else
     dnl Detect http://sourceware.org/bugzilla/show_bug.cgi?id=12092.
     AC_CACHE_CHECK([whether strstr works],
@@ -25,14 +24,17 @@ AC_DEFUN([gl_FUNC_STRSTR_SIMPLE],
     ]])],
         [gl_cv_func_strstr_works_always=yes],
         [gl_cv_func_strstr_works_always=no],
-        [dnl glibc 2.12 and cygwin 1.7.7 have a known bug.  Assume that it
-         dnl works on all other platforms, even if it is not linear.
+        [dnl glibc 2.12 and cygwin 1.7.7 have a known bug.  uClibc is not
+         dnl affected, since it uses different source code for strstr than
+         dnl glibc.
+         dnl Assume that it works on all other platforms, even if it is not
+         dnl linear.
          AC_EGREP_CPP([Lucky user],
            [
 #ifdef __GNU_LIBRARY__
  #include <features.h>
  #if ((__GLIBC__ == 2 && __GLIBC_MINOR__ > 12) || (__GLIBC__ > 2)) \
-     && !defined __UCLIBC__
+     || defined __UCLIBC__
   Lucky user
  #endif
 #elif defined __CYGWIN__
@@ -44,14 +46,16 @@ AC_DEFUN([gl_FUNC_STRSTR_SIMPLE],
   Lucky user
 #endif
            ],
-           [gl_cv_func_strstr_works_always=yes],
+           [gl_cv_func_strstr_works_always="guessing yes"],
            [gl_cv_func_strstr_works_always="guessing no"])
         ])
       ])
-    if test "$gl_cv_func_strstr_works_always" != yes; then
-      REPLACE_STRSTR=1
-      AC_LIBOBJ([strstr])
-    fi
+    case "$gl_cv_func_strstr_works_always" in
+      *yes) ;;
+      *)
+        REPLACE_STRSTR=1
+        ;;
+    esac
   fi
 ]) # gl_FUNC_STRSTR_SIMPLE
 
@@ -68,10 +72,11 @@ AC_DEFUN([gl_FUNC_STRSTR],
 #include <stdlib.h> /* for malloc */
 #include <unistd.h> /* for alarm */
 static void quit (int sig) { exit (sig + 128); }
-]], [[size_t m = 1000000;
+]], [[
+    int result = 0;
+    size_t m = 1000000;
     char *haystack = (char *) malloc (2 * m + 2);
     char *needle = (char *) malloc (m + 2);
-    void *result = 0;
     /* Failure to compile this test due to missing alarm is okay,
        since all such platforms (mingw) also have quadratic strstr.  */
     signal (SIGALRM, quit);
@@ -85,17 +90,21 @@ static void quit (int sig) { exit (sig + 128); }
         memset (needle, 'A', m);
         needle[m] = 'B';
         needle[m + 1] = 0;
-        result = strstr (haystack, needle);
+        if (!strstr (haystack, needle))
+          result |= 1;
       }
-    return !result;]])],
+    return result;
+    ]])],
         [gl_cv_func_strstr_linear=yes], [gl_cv_func_strstr_linear=no],
-        [dnl Only glibc > 2.12 and cygwin > 1.7.7 are known to have a
-         dnl bug-free strstr that works in linear time.
+        [dnl Only glibc > 2.12 on processors without SSE 4.2 instructions and
+         dnl cygwin > 1.7.7 are known to have a bug-free strstr that works in
+         dnl linear time.
          AC_EGREP_CPP([Lucky user],
            [
 #include <features.h>
 #ifdef __GNU_LIBRARY__
  #if ((__GLIBC__ == 2 && __GLIBC_MINOR__ > 12) || (__GLIBC__ > 2)) \
+     && !(defined __i386__ || defined __x86_64__) \
      && !defined __UCLIBC__
   Lucky user
  #endif
@@ -107,15 +116,15 @@ static void quit (int sig) { exit (sig + 128); }
  #endif
 #endif
            ],
-           [gl_cv_func_strstr_linear=yes],
+           [gl_cv_func_strstr_linear="guessing yes"],
            [gl_cv_func_strstr_linear="guessing no"])
         ])
       ])
-    if test "$gl_cv_func_strstr_linear" != yes; then
-      REPLACE_STRSTR=1
-    fi
-  fi
-  if test $REPLACE_STRSTR = 1; then
-    AC_LIBOBJ([strstr])
+    case "$gl_cv_func_strstr_linear" in
+      *yes) ;;
+      *)
+        REPLACE_STRSTR=1
+        ;;
+    esac
   fi
 ]) # gl_FUNC_STRSTR