I hope this is a reasonable question to ask here. I've tried searching around for quite some time, but to no avail.

I used h2xs to generate the framework for a Perl module from a C header file (the first time I've ever done this). One the features automatically given to me is the ability to access #define'd constants from the C .h header file. This generated code goes into one package. That package appears to make the #define'd constants available as simple subroutines using (in part) AUTOLOAD.

From another package, I 'use' the package with the #define'd constants. When I attempt to access any of the #define'd constants, I do indeed get the appropriate value returned. However, I also get the following warning: 

Prototype mismatch: sub CrashDump::dumpsys::CDUMP_MAGIC vs () at
        CrashDump/blib/lib/CrashDump/dumpsys.pm line 114 (#1)   
    (S unsafe) The subroutine being declared or defined had previously
+ been declared
    or defined with a different function prototype.

[download]
As best I can tell, this is in part related to the following section of the AUTOLOAD routine in dumpsys.pm (an h2xs-generated file): 
    {
        no strict 'refs';
        # Fixed between 5.005_53 and 5.005_61
        if ($] >= 5.00561) {
            *$AUTOLOAD = sub () { $val };
        }
        else {
            *$AUTOLOAD = sub { $val };
        }
    }

[download]
I'm running perl v5.6.0 on Tru64 UNIX V5.1. So $] == 5.006. Thus, the first line (with parens after "sub") is used.

If I edit dumpsys.pm and force it to use the second line (without parens), I don't get the warning. However, I'd rather not do that because (1) dumpsys.pm is a generated file, and (2) it's probably that way for a reason, right?

Your assistance in understanding and possibly fixing this warning message is appreciated. Thanks.

In reply to "Prototype mismatch" using h2xs-generated code by rjbell4

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