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-rwxr-xr-xConfigure43
1 files changed, 41 insertions, 2 deletions
diff --git a/Configure b/Configure
index 6041b0bbb0..a83cbdf2f8 100755
--- a/Configure
+++ b/Configure
@@ -16155,8 +16155,47 @@ set mbtowc d_mbtowc
eval $inlibc
: see if memmem exists
-set memmem d_memmem
-eval $inlibc
+echo " "
+echo "Checking if you have a working memmem()" >&4
+$cat >try.c <<EOCP
+#$d_gnulibc HAS_GNULIBC /**/
+#if defined(HAS_GNULIBC) && !defined(_GNU_SOURCE)
+# define _GNU_SOURCE
+#endif
+#include <stdio.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <string.h>
+int main(int argc, char **argv)
+{
+ char *big = "abcdefghiabcdefghi";
+ char *little = "def";
+ char *rtn;
+ ptrdiff_t diff;
+ rtn = (char *) memmem(big, strlen(big), little, strlen(little));
+ diff = rtn - big;
+ exit(diff == 3 ? EXIT_SUCCESS : EXIT_FAILURE);
+}
+EOCP
+set try
+if eval $compile; then
+ `$run ./try`
+ rc=$?
+ case "$rc" in
+ 0) echo "Yes, you do." >&4
+ val="$define"
+ ;;
+ *) echo "Well, you have memmem, but it isn't working." >&4
+ val="$undef"
+ ;;
+ esac
+else
+ echo "No, you do not." >&4
+ val="$undef"
+fi
+set d_memmem
+eval $setvar
+$rm_try
: see if memrchr exists
set memrchr d_memrchr