Note to future self about moving the regexp flag bits around.

p4raw-id: //depot/perl@32759

2 files changed, 5 insertions, 2 deletions

diff --git a/op.h b/op.h
index 9dda22fbcb..bab04ca6ba 100644
--- a/op.h
+++ b/op.h
@@ -367,7 +367,8 @@ struct pmop {
 #define PMf_EVAL	0x0400		/* evaluating replacement as expr */
 
 /* The following flags have exact equivalents in regcomp.h with the prefix RXf_
- * which are stored in the regexp->extflags member.
+ * which are stored in the regexp->extflags member. If you change them here,
+ * you have to change them there, and vice versa.
  */
 #define PMf_LOCALE	0x00800		/* use locale for character types */
 #define PMf_MULTILINE	0x01000		/* assume multiple lines */
diff --git a/regexp.h b/regexp.h
index 623a4bbb10..60606a5158 100644
--- a/regexp.h
+++ b/regexp.h
@@ -245,7 +245,9 @@ and check for NULL.
 #define RXf_WHITE		0x00000400 /* Pattern is /\s+/ */
 #define RXf_NULL		0x40000000 /* Pattern is // */
 
-/* 0x1F800 of extflags is used by (RXf_)PMf_COMPILETIME */
+/* 0x1F800 of extflags is used by (RXf_)PMf_COMPILETIME
+ * If you change these you need to change the equivalent flags in op.h, and
+ * vice versa.  */
 #define RXf_PMf_LOCALE  	0x00000800 /* use locale */
 #define RXf_PMf_MULTILINE	0x00001000 /* /m         */
 #define RXf_PMf_SINGLELINE	0x00002000 /* /s         */