[perl #134363] Odd warning in simple XSub (-Dusequadmath buildsonly)

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Hi,

The Inline::C demo script:

#####################
use warnings;
use Devel::Peek;
use Inline C => Config =>
 BUILD_NOISY => 1,
 USING => 'ParseRegExp',
;
use Inline C => <<'EOC';
void foo(NV val) {
  printf("%.15" NVgf, val);
}
EOC
foo(sqrt(3));
#####################

On my -Dusequadmath build of perl-5.30.0 I get the following warning during
the compilation stage:

try_pl_0ea3.xs: In function ‘foo’:
try_pl_0ea3.xs:7:10: warning: unknown conversion type character ‘Q’ in
format [-Wformat=]
   printf("%.15" NVgf, val);
          ^~~~~~
try_pl_0ea3.xs:7:10: warning: too many arguments for format
[-Wformat-extra-arg ]

Upon compilation the script then runs successfully.

I noticed the same warning building Scalar-List-Utils-1.51 on the same
build of perl.
In that instance it was triggered by identical formatting in ListUtil.xs

The same code compiles without warning on non-quadmath builds of perl-5.30.0

Cheers,
Rob

• [perl #134363] Odd warning in simple XSub (-Dusequadmath buildsonly) by James E Keenan via RT
• Re: [perl #134363] Odd warning in simple XSub (-Dusequadmathbuildsonly) by James E Keenan
• Re: [perl #134363] Odd warning in simple XSub (-Dusequadmathbuildsonly) by sisyphus
• [perl #134363] Odd warning in simple XSub (-Dusequadmath buildsonly) by sisyphus