touch-packages team mailing list archive

[Fabrizio Gennari <1341125@xxxxxxxxxxxxxxxxxx>]

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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https://bugs.launchpad.net/bugs/1341125

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>
  This is free software: you are free to change and redistribute it.
  There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
  and "show warranty" for details.
  This GDB was configured as "x86_64-linux-gnu".
  Type "show configuration" for configuration details.
  For bug reporting instructions, please see:
  <http://www.gnu.org/software/gdb/bugs/>.
  Find the GDB manual and other documentation resources online at:
  <http://www.gnu.org/software/gdb/documentation/>.
  For help, type "help".
  Type "apropos word" to search for commands related to "word".
  (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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