Fix building MAD with C++ - a MAD_PV of "" is illegal, as it will be free()d.

[p5sagit/p5-mst-13.2.git] / pod / perlxs.pod

diff --git a/pod/perlxs.pod b/pod/perlxs.pod
index c367f4c..5ad24d8 100644 (file)
--- a/pod/perlxs.pod
+++ b/pod/perlxs.pod
@@ -319,7 +319,7 @@ CPAN modules) in the typemap file, the reference count of the C<AV *>
 is not properly decremented. Thus, the above XSUB would leak memory
 whenever it is being called. The same problem exists for C<HV *>.
 
-When you're returning an C<AV *> or a C<HV *>, you have make sure
+When you're returning an C<AV *> or a C<HV *>, you have to make sure
 their reference count is decremented by making the AV or HV mortal:
 
   AV *
@@ -1211,6 +1211,12 @@ To disable version checking:
 
     VERSIONCHECK: DISABLE
 
+Note that if the version of the PM module is an NV (a floating point
+number), it will be stringified with a possible loss of precision
+(currently chopping to nine decimal places) so that it may not match
+the version of the XS module anymore. Quoting the $VERSION declaration
+to make it a string is recommended if long version numbers are used.
+
 =head2 The PROTOTYPES: Keyword
 
 The PROTOTYPES: keyword corresponds to B<xsubpp>'s C<-prototypes> and