From: Jarkko Hietaniemi <jhi@iki.fi>
Date: Sat, 11 Nov 2000 21:12:01 +0000 (+0000)
Subject: Copy the s// information of README.hpux also to the perlrun.
X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=commitdiff_plain;h=efdf3af0101f6674227449ca5d7f23c6fc6c46e5;p=p5sagit%2Fp5-mst-13.2.git

Copy the s// information of README.hpux also to the perlrun.

p4raw-id: //depot/perl@7652
---

diff --git a/README.hpux b/README.hpux
index e12c60d..e850441 100644
--- a/README.hpux
+++ b/README.hpux
@@ -243,22 +243,22 @@ fix is currently available.
 
 =head2 perl -P and //
 
-In HP-UX perl is compiled with flags that will cause problems if the
+In HP-UX Perl is compiled with flags that will cause problems if the
 -P flag of Perl (preprocess Perl code with the C preprocessor before
 perl sees it) is used.  The problem is that C<//>, being a C++-style
 until-end-of-line comment, will disappear along with the remainder
 of the line.  This means that common Perl constructs like
 
-	s/foo//;
+    s/foo//;
 
 will turn into illegal code
 
-	s/foo
+    s/foo
 
-The workaround is to use some other quoting characters than /,
-like for example !
+The workaround is to use some other quoting separator than C<"/">,
+like for example C<"!">:
 
-	s!foo!!;
+    s!foo!!;
 
 =head1 AUTHOR
 
diff --git a/pod/perlrun.pod b/pod/perlrun.pod
index c131ad0..d532912 100644
--- a/pod/perlrun.pod
+++ b/pod/perlrun.pod
@@ -569,9 +569,23 @@ the implicit loop, just as in B<awk>.
 =item B<-P>
 
 causes your program to be run through the C preprocessor before
-compilation by Perl.  (Because both comments and B<cpp> directives begin
+compilation by Perl.  Because both comments and B<cpp> directives begin
 with the # character, you should avoid starting comments with any words
-recognized by the C preprocessor such as "if", "else", or "define".)
+recognized by the C preprocessor such as C<"if">, C<"else">, or C<"define">.
+Also, in some platforms the C preprocessor knows too much: it knows
+about the C++ -style until-end-of-line comments starting with C<"//">.
+This will cause problems with common Perl constructs like
+
+    s/foo//;
+
+because after -P this will became illegal code
+
+    s/foo
+
+The workaround is to use some other quoting separator than C<"/">,
+like for example C<"!">:
+
+    s!foo!!;
 
 =item B<-s>