Negative.

On Linux/glibc, normally the _BSD_SOURCE, _SVID_SOURCE, _POSIX_SOURCE are on by default. See /usr/include/features.h. On ~BSD, some long double variants may be missing, or implemented as wrappers to a standard double function (with precision loss). Google around (for manpages and discussions). E.g. erfl() appears on FreeBSD 10.1 manpages, but not on 10.0. And no powl(). The sinhl/coshl/tanhl may be wrappers.

I started up a decade-old FreeBSD 6.0 install; looking in libm.a (and libc.a), there is no erfl. The gcc-3.4.4 recognizes __builtin_erfl(), but this just defers to system erfl, and it fails to link.

So, you're out of luck. Furthermore, (some) tests for availability ought to verify the precision, too.

In reply to Re^3: [C Question] Determine if gcc provides erfl() function by Anonymous Monk
in thread [C Question] Determine if gcc provides erfl() function by syphilis

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.