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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/98384] [11 Regression] new test case
 20_util/to_chars/long_double.cc in r11-6249 fails on powerpc64 BE
Date: Wed, 24 Feb 2021 15:48:42 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98384

--- Comment #15 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
printf("%L.1000f\n", 1.0L);

The length modifier needs to come after precision, not before it, so
you should be using
printf("%.1000Lf\n", 1.0L);
instead.
But the test nor libstdc++ itself doesn't do that, does it?=