libgpg-error 1.61: t-printf failure on powerpc64-linux

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Date: Tue, 14 Jul 2026 16:14:54 +0200
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From: "C. Neidahl" <[email protected]>
Subject: libgpg-error 1.61: t-printf failure on powerpc64-linux
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Greetings,

I am trying to build libgpg-errpr version 1.61 for big-endian 
powerpc64-linux with GCC 15.2.0 and run the test suite.

The t-printf test is failing:

t-printf: format "%.100Lf" with LDBL_MAX unexpectly did not fail
FAIL: t-printf

Applying bfdf7b0b7b62 (tests: Skip a test when !HAVE_LONG_DOUBLE_WIDER) 
does not help with this, as LDBL_MAX > DBL_MAX:

checking for long double with more range or precision than double... yes

long double on this platform defaults to a sum of two double values (IBM 
double-double), which is not an IEEE-754 compliant implementation, so 
LDBL_* are possibly going to be different than what you're expecting.

You can check last year's changes to gnulib's lib/float.h.in and 
tests/test-float-h.c, and the mailing list messages from the same time, 
for details on this format and changes that GCC 15 & C23 brought to 
these definitions.

Let me know if you need any more details.

Have a nice day.

Cosima Neidahl

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