Bug#319553: g++-4.0: HUGE_VAL causes error with -pedantic

[Ben Burton <bab@debian.org>]

Package: g++-4.0
Version: 4.0.1-2
Severity: normal

Hi,

I've run into a build failure whilst transitioning one of my packages to
g++-4.0.  The error occurs when HUGE_VAL is used with -pedantic in C++ code,
as in the following program:

  #include <math.h>

  int main() {
      double d = 1.0;
      if (d == HUGE_VAL)
          return 1;
      return 0;
  }

When compiled with g++-3.3, it prints a warning (use of C99 hexadecimal
floating constant, as described elsewhere in #231748) but compiles fine.

  example:~> g++-3.3 -pedantic huge_val.cc
  huge_val.cc:6:14: warning: use of C99 hexadecimal floating constant
  example:~>

However, when compiled with g++-4.0 it prints the same warning and then
gives an error (floating constant exceeds range of 'double').

  example:~> g++-4.0 -pedantic huge_val.cc
  huge_val.cc:6:14: warning: use of C99 hexadecimal floating constant
  huge_val.cc:6: error: floating constant exceeds range of 'double'
  example:~>

If you remove the -pedantic, it compiles fine.  If you compile it with
gcc-4.0 as a C program, it also compiles fine (just the warning, no error).

  example:~> g++-4.0 huge_val.cc
  example:~> gcc-4.0 -pedantic huge_val.c
  huge_val.c:6:14: warning: use of C99 hexadecimal floating constant
  example:~>

I'm filing this as a separate bug from #231748, since it occurs in
different contexts (v4.0 only, C++ only), the error is different and
the result is more severe (build failure, not just warning).

Ben.

-- System Information:
Debian Release: testing/unstable
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: i386 (i686)
Shell:  /bin/sh linked to /bin/bash
Kernel: Linux 2.6.10-1-686-smp
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968)

Versions of packages g++-4.0 depends on:
ii  gcc-4.0                     4.0.1-2      The GNU C compiler
ii  gcc-4.0-base                4.0.1-2      The GNU Compiler Collection (base·
ii  libc6                       2.3.2.ds1-22 GNU C Library: Shared libraries an
ii  libstdc++6-4.0-dev          4.0.1-2      The GNU Standard C++ Library v3 (d

g++-4.0 recommends no packages.

-- no debconf information