Extend previous patch to cygwin 1.7.0.

* m4/memmem.m4 (gl_FUNC_MEMMEM): When cross-compiling, assume a
fast implementation in cygwin >= 1.7.0.
* m4/strstr.m4 (gl_FUNC_STRSTR): Likewise.
* m4/strcasestr.m4 (gl_FUNC_STRCASESTR): Likewise.

Signed-off-by: Eric Blake <ebb9@byu.net>

3 files changed, 33 insertions, 15 deletions

diff --git a/m4/memmem.m4 b/m4/memmem.m4
index c7bd9d617a..d8c1230970 100644
--- a/m4/memmem.m4
+++ b/m4/memmem.m4
@@ -1,4 +1,4 @@
-# memmem.m4 serial 11
+# memmem.m4 serial 12
 dnl Copyright (C) 2002, 2003, 2004, 2007, 2008 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -49,14 +49,20 @@ AC_DEFUN([gl_FUNC_MEMMEM],
     /* Check for empty needle behavior.  */
     return !result || !memmem ("a", 1, 0, 0);]])],
 	[gl_cv_func_memmem_works=yes], [gl_cv_func_memmem_works=no],
-	[dnl Only glibc >= 2.9 is known to have a memmem that works in
-	 dnl linear time.
-	 AC_EGREP_CPP([Lucky GNU user],
+	[dnl Only glibc >= 2.9 and cygwin >= 1.7.0 are known to have a
+	 dnl memmem that works in linear time.
+	 AC_EGREP_CPP([Lucky user],
 	   [
 #include <features.h>
 #ifdef __GNU_LIBRARY__
  #if (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 9) || (__GLIBC__ > 2)
-  Lucky GNU user
+  Lucky user
+ #endif
+#endif
+#ifdef __CYGWIN__
+ #include <cygwin/version.h>
+ #if CYGWIN_VERSION_DLL_MAJOR >= 1007
+  Lucky user
  #endif
 #endif
 	   ],
diff --git a/m4/strcasestr.m4 b/m4/strcasestr.m4
index d8925adf8f..0ad895acfd 100644
--- a/m4/strcasestr.m4
+++ b/m4/strcasestr.m4
@@ -1,4 +1,4 @@
-# strcasestr.m4 serial 10
+# strcasestr.m4 serial 11
 dnl Copyright (C) 2005, 2007, 2008 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -49,14 +49,20 @@ AC_DEFUN([gl_FUNC_STRCASESTR],
       }
     return !result;]])],
 	[gl_cv_func_strcasestr_linear=yes], [gl_cv_func_strcasestr_linear=no],
-	[dnl Only glibc >= 2.9 is known to have an strcasestr that works in
-	 dnl linear time.
-	 AC_EGREP_CPP([Lucky GNU user],
+        [dnl Only glibc >= 2.9 and cygwin >= 1.7.0 are known to have a
+         dnl strcasestr that works in linear time.
+	 AC_EGREP_CPP([Lucky user],
 	   [
 #include <features.h>
 #ifdef __GNU_LIBRARY__
  #if (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 9) || (__GLIBC__ > 2)
-  Lucky GNU user
+  Lucky user
+ #endif
+#endif
+#ifdef __CYGWIN__
+ #include <cygwin/version.h>
+ #if CYGWIN_VERSION_DLL_MAJOR >= 1007
+  Lucky user
  #endif
 #endif
 	   ],
diff --git a/m4/strstr.m4 b/m4/strstr.m4
index fe01d5f49d..67b93c9f76 100644
--- a/m4/strstr.m4
+++ b/m4/strstr.m4
@@ -1,4 +1,4 @@
-# strstr.m4 serial 3
+# strstr.m4 serial 4
 dnl Copyright (C) 2008 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -34,14 +34,20 @@ AC_DEFUN([gl_FUNC_STRSTR],
       }
     return !result;]])],
       [gl_cv_func_strstr_linear=yes], [gl_cv_func_strstr_linear=no],
-      [dnl Only glibc >= 2.9 is known to have an strstr that works in
-       dnl linear time.
-       AC_EGREP_CPP([Lucky GNU user],
+      [dnl Only glibc >= 2.9 and cygwin >= 1.7.0 are known to have a
+       dnl strstr that works in linear time.
+       AC_EGREP_CPP([Lucky user],
 	 [
 #include <features.h>
 #ifdef __GNU_LIBRARY__
  #if (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 9) || (__GLIBC__ > 2)
-  Lucky GNU user
+  Lucky user
+ #endif
+#endif
+#ifdef __CYGWIN__
+ #include <cygwin/version.h>
+ #if CYGWIN_VERSION_DLL_MAJOR >= 1007
+  Lucky user
  #endif
 #endif
 	 ],