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From: "kargl at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/61847] bug in gfortran runtime on OSX: digits cut off when reading floating point number
Date: Mon, 21 Jul 2014 17:58:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61847

--- Comment #6 from kargl at gcc dot gnu.org ---
(In reply to kargl from comment #4)
> (In reply to e2cd58e1 from comment #3)
> > but what I want to do is read in values with point as decimal separator.
> > Using
> > 
> >   open(unit=1,file='bug.dat', decimal="point")
> > 
> > doesn't seem to change anything.
> 
> gfortran's IO for floating point numbers using the operating
> systems strtof, strtod, and strtold.  Are you sure that these
> functions on yuor OS actual have working locale support?

Yeah, replying to myself.

What happens if you give strtod "1.2345' and "1,2345" in
your locale?  I missed a section of code in io/read.c:

    case ',':
      if (dtp->u.p.current_unit->decimal_status != DECIMAL_COMMA)
        goto bad_float;
      /* Fall through.  */
    case '.':
      if (seen_dp)
        goto bad_float;
      if (!seen_int_digit)
        *(out++) = '0';
      *(out++) = '.';
      seen_dp = 1;
      break;

This implicitly changes a comma into a decimal point prior to the
call to strtod.