isbigendian

Is the machine big or little endian?

  print "Your machins is big endian.\n" if isbigendian();

returns 1 if the machine is big endian, 0 if little endian, or dies if neither. It uses the "byteorder" element of perl's %Config array.

   my $retval = isbigendian();

trylink

a perl configure clone

  if (trylink 'libGL', '', 'char glBegin(); glBegin();', '-lGL') {
    $libs = '-lGLU -lGL';
    $have_GL = 1;
  } else {
    $have_GL = 0;
  }
  $maybe =
    trylink 'libwhatever', $inc, $body, $libs, $cflags,
        {MakeMaker=>1, Hide=>0, Clean=>1};

Try to link some C-code making up the body of a function with a given set of library specifiers

return 1 if successful, 0 otherwise

   trylink $infomsg, $include, $progbody, $libs [,$cflags,{OPTIONS}];

Takes 4 + 2 optional arguments.

• an informational message to print (can be empty)
• any commands to be included at the top of the generated C program (typically something like "#include "mylib.h"")
• the body of the program (in function main)
• library flags to use for linking. Preprocessing by MakeMaker should be performed as needed (see options and example).
• compilation flags. For example, something like "-I/usr/local/lib". Optional argument. Empty if omitted.
• OPTIONS

generate_core_flags

prints on "STDOUT" XS text with core flags, for Core.xs.

got_complex_version

  PDL::Core::Dev::got_complex_version($func_name, $num_params)

For a given function appearing in C99's "complex.h", will return a boolean of whether the system being compiled on has the complex version of that. E.g. for "sin", will test whether "csinl" exists (before 2.069, would only check for "csin", causing build failures on non-C99 compliant "libc" which mandates long-double versions).