format_test.format_double fails

[UnitedMarsupials]

Compiling on FreeBSD-14/amd64, using the base compiler (clang-16.0.6). The build succeeds, but one of the tests fails:

[ RUN      ] format_test.format_double
.../fmtlib/work/fmt-10.1.1/test/format-test.cc:1354: Failure
Expected equality of these values:
  fmt::format("{:.9a}", xd)
    Which is: "0x2.000000000p+2"
  buffer
    Which is: "0x1.000000000p+3"
[  FAILED  ] format_test.format_double (3 ms)

Please, advise. Thank you!

[phprus]

The error occurs due to different rounding in different libc (macOS, glibc, FreeBSD 13,14):

format	fmt	glibc
{:.10a}	0x1.ffffffffffp+2	0x1.ffffffffffp+2
{:.9a}	0x2.000000000p+2	0x2.000000000p+2

Previous issues: #3512, #3433

I will make a fix for these tests.

[phprus]

Fix for test: #3762