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-rwxr-xr-xconfig_h.SH3
1 files changed, 3 insertions, 0 deletions
diff --git a/config_h.SH b/config_h.SH
index a24daa6f1f..ef135e2528 100755
--- a/config_h.SH
+++ b/config_h.SH
@@ -3011,6 +3011,9 @@ sed <<!GROK!THIS! >$CONFIG_H -e 's!^#undef\(.*/\)\*!/\*#define\1 \*!' -e 's!^#un
* This symbol, if defined, indicates that the memmem routine is
* available to return a pointer to the start of the first occurance
* of a substring in a memory area (or NULL if not found).
+ * In glibc, memmem is a GNU extension. The function is visible in
+ * libc, but the prototype is only visible if _GNU_SOURCE is #defined.
+ * Thus we only define this if both the prototype and symbol are found.
*/
#$d_memmem HAS_MEMMEM /**/