X-Git-Url: https://perl5.git.perl.org/perl5.git/blobdiff_plain/2e3ef32f4acc106de6ae8170099f09a36d4ef490..b61e55cb1695ff940310c75f08e41cfbfc16d73c:/config_h.SH

diff --git a/config_h.SH b/config_h.SH
index f26ed2f..e776983 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		/**/
 
@@ -3501,13 +3504,13 @@ sed <<!GROK!THIS! >$CONFIG_H -e 's!^#undef\(.*/\)\*!/\*#define\1 \*!' -e 's!^#un
 
 /* HAS_TOWLOWER:
  *	This symbol, if defined, indicates that the towlower () routine is
- *	available to do string concatenation.
+ *	available to do case conversion.
  */
 #$d_towlower HAS_TOWLOWER		/**/
 
 /* HAS_TOWUPPER:
  *	This symbol, if defined, indicates that the towupper () routine is
- *	available to do string concatenation.
+ *	available to do case conversion.
  */
 #$d_towupper HAS_TOWUPPER		/**/
 
@@ -4228,11 +4231,11 @@ sed <<!GROK!THIS! >$CONFIG_H -e 's!^#undef\(.*/\)\*!/\*#define\1 \*!' -e 's!^#un
 #$use64bitall	USE_64_BIT_ALL		/**/
 #endif
 
-/* USE_CBACKTRACE:
+/* USE_C_BACKTRACE:
  *	This symbol, if defined, indicates that Perl should
  *	be built with support for backtrace.
  */
-#$usecbacktrace USE_CBACKTRACE		/**/
+#$usecbacktrace USE_C_BACKTRACE		/**/
 
 /* USE_DTRACE:
  *	This symbol, if defined, indicates that Perl should