Can you simply call croak(), with argument(s) that specify the package name and the function name ? Perl will take care of the line number for you: 
## test.pl ##
package MYFOO;
use warnings;
use Inline C => Config =>
    BUILD_NOISY => 1;

use Inline C => <<'EOC';

void foo() {
     croak("Package MYFOO, function foo() croaked");
}

EOC

MYFOO::foo(); #line 15

__END__
Outputs:

Package MYFOO, function foo() croaked at test.pl line 15.

[download]

Cheers,
Rob

In reply to Re: Output package and function name as well as linenum in a die in XS by syphilis
in thread Output package and function name as well as linenum in a die in XS by tbusch

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