[Bug 1341125] Re: Cannot enter floating point (double) numbers

[Fabrizio Gennari]

After further investigation it seems that gdb assumes that floating-
point numbers use . as decimal mark, as these lines from c-exp.y show

            else if (!got_dot && *p == '.')
              got_dot = 1;

but, later, the function parse_float() (in parse.c) feeds the string
into sscanf

  num = sscanf (copy, "%" DOUBLEST_SCAN_FORMAT "%n", d, &n);
 
and, apparently, sscanf is locale-sensitive, so, if the current locale has , as decimal mark, sscanf will leave everything past the . sign unscanned. gdb, then, notices that something is unscanned and says "invalid number"

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Title:
  Cannot enter floating point (double) numbers

Status in “gdb” package in Ubuntu:
  New

Bug description:
  (gdb) show version 
  GNU gdb (Ubuntu 7.7-0ubuntu3.1) 7.7
  Copyright (C) 2014 Free Software Foundation, Inc.
  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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  (gdb) p 1.0
  Invalid number "1.0".

  Yet, the latest git (tested 76bd66cfb5207137dac01534cf7d8af8f708743b
  from today) recognises 1.0 just fine, as a double

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