-                && sizeof(ebuf) - float_need > precis
+                && sizeof(ebuf) - float_need > precis + 7

[download]

Thanks for digging. :) I suspect that the compiler is (quite reasonably) failing to understand that we check the size of the radix point and adjust float_need accordingly - that it assumes worst case we will not enter that branch (of which it in any case cannot reasonably understand the intent), and so its analysis acts as if we're always treating the radix point as width 1.

It would probably be reasonable to make the above change (but probably folding it into float_need instead: 

-                          +  1  /* default radix point '.' */
+                          +  8  /* worst case radix point */

[download]
) and remove the later "float_need += (SvCUR(PL_numeric_radix_sv) - 1)". Though it's sad that this isn't enough to remove the need for the whole WITH_LC_NUMERIC_SET_TO_NEEDED_IN malarkey.

I'll respond to the github issue separately, it'll take me some time to go through the options you describe.

Hugo

In reply to Re^10: Influencing the Gconvert macro by hv
in thread Influencing the Gconvert macro 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.