Re: CROSSP: C::Scan doesn't work with my Activestate perl

[Brzezinski, Paul J]

I ran into similar problem trying to use h2xs with -x switch.  C::Scan 
isn't part of the ActiveState distribution, I think it's actually not 
part of standard perl distribution either...  I can't recall if I had to 
load Data::Flow using PPM.  If you're using microsoft's C compiler 
[looks like you are], it doesn't seem to accept input on it's STDIN.  
But you already knew this. 

I haven't tried this, but I did look at the code in C::Scan.pm, in the 
C::Preprocess section, the new sub contains the following:

   my $cmd = "echo '\#include \"$filename\"' | $Cpp->{cppstdin} $Defines $addincludes 
$Cpp->{cppflags} $Cpp->{cppminus} |";
   #my $cmd = "$Cpp->{cppstdin} $Defines $addincludes $Cpp->{cppflags} $Cpp->{cppminus} 
< $filename |";
   #my $cmd = "echo '\#include <$filename>' | $Cpp->{cppstdin} $Defines $addincludes 
$Cpp->{cppflags} $Cpp->{cppminus} |";
So I'm wondering you could try this:
   #my $cmd = "echo '\#include \"$filename\"' | $Cpp->{cppstdin} $Defines $addincludes 
$Cpp->{cppflags} $Cpp->{cppminus} |";
   my $cmd = "$Cpp->{cppstdin} $Defines $addincludes $Cpp->{cppflags} $filename 
|";
   #my $cmd = "echo '\#include <$filename>' | $Cpp->{cppstdin} $Defines $addincludes 
$Cpp->{cppflags} $Cpp->{cppminus} |";
I ended up putting a .bat file in the same dir with h2xs.bat called 
cppstdin.bat, it's contents:

@echo off
cl /E %*
Thompson, Lloyd D. (NSSD) wrote:
Hello,
I'm trying to use h2xs to create a perl interface to an existing c++ 
api library.  The first problem I had was C::Scan wasn't installed so 
I installed it through ppm. 

Then C::Scan initially failed because cppstdin wasn't defined, so in 
lib\Config.pm I changed cppstdin='' to cppstdin='cl -nologo -E'. 

Now my current problem is when I call h2xs with header file arguments 
C::Scan executes my cppstdin statement but without a file argument.  
The error I receive is 'cl : Command line error D2003 : missing source 
filename'. 

So my thought is I missed something when I changed the cppstdin line 
in Config.pm.  I have tried this h2xs process under cygwin and C::Scan 
was able to successfully parse the header file and h2xs generated a 
filled out .xs file (I had other issues with this I won't discuss 
here, which is why I'm trying to get the activestate version 
working).  Any ideas are very appreciated.

Thanks
Lloyd
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