Hi,
As regards my problems in getting the CCFLAGSEX setting right in this script (from my initial post): 
use strict;
use warnings;
use Config;

use Inline C => Config =>
  USING => 'ParseRegExp',
  CCFLAGSEX => '-DMY_FORMAT=\\"%.16e\\"',
  BUILD_NOISY => 1,
;

use Inline C =><<'EOC';

SV * foo(void) {
  printf(MY_FORMAT, sqrt(2.0));
  printf("\n");
}

EOC

foo();

[download]
I've found that it has nothing to do with the versions of Inline::C or ExtUtils::MakeMaker or perl itself.
It's the flavour of make that's critical.

If $Config{make} is gmake then the "%" needs to be replaced with "%%". But if $Config{make} is dmake then it has to be the single "%".
Essentially, whatever works with dmake will also work with gmake so long as that replacement is made.
For example, either of these will work with dmake (but not with gmake): 
CCFLAGSEX => '-DMY_FORMAT=\\"%.16e\\"',
CCFLAGSEX => "-DMY_FORMAT=\\\"%.16e\\\"",
CCFLAGSEX => q["-DMY_FORMAT=\\"%.16e\\""],

[download]
and either of these will work with gmake (but not with dmake): 
CCFLAGSEX => '-DMY_FORMAT=\\"%%.16e\\"',
CCFLAGSEX => "-DMY_FORMAT=\\\"%%.16e\\\"",
CCFLAGSEX => q["-DMY_FORMAT=\\"%%.16e\\""],

[download]
The situation with gmake looks very much like a bug to me.
If it is a bug, I'm guessing it's in perl (probably EU::MM), though it could also be a bug in gmake itself.
That's all I know at the moment.

Cheers,
Rob

In reply to Re: Defining an XS symbol in the Makefile.PL (largely solved) by syphilis
in thread Defining an XS symbol in the Makefile.PL by syphilis

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