Bug#6047: marked as done ([Fix in {gcc,egcc}-2.91.x] badly initialized union in gcc include file)
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and subject line closing gcc272 bugs
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From: Branden Robinson <branden@ecn.purdue.edu>
Subject: badly initialized union in gcc include file
To: submit@bugs.debian.org
Date: Wed, 18 Dec 1996 01:34:35 -0500 (EST)
Cc: debian-user@lists.debian.org
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Package: gcc
Version: 2.7.2.1-2
-- Please describe the problems with the package here
Found a small syntactical blunder in
/usr/lib/gcc-lib/i486-linux/2.7.2.1/include/float.h:
/* float.h */
#ifndef _FLOAT_H___
#define _FLOAT_H___
/* Produced by enquire version 4.3, CWI, Amsterdam */
[...]
/* Number of base-FLT_RADIX digits in the significand of a long double */
#undef LDBL_MANT_DIG
#define LDBL_MANT_DIG 64
/* Number of decimal digits of precision in a long double */
#undef LDBL_DIG
#define LDBL_DIG 18
/* Difference between 1.0 and the minimum long double greater than 1.0 */
#undef LDBL_EPSILON
#ifndef __LDBL_UNION__
#define __LDBL_UNION__
union __convert_long_double {
unsigned __convert_long_double_i[4];
long double __convert_long_double_d;
};
#endif
#define LDBL_EPSILON (__extension__ ((union __convert_long_double) {0x0, 0x80000
000, 0x3fc0, 0x0}).__convert_long_double_d)
/* Minimum int x such that FLT_RADIX**(x-1) is a normalised long double */
#undef LDBL_MIN_EXP
#define LDBL_MIN_EXP (-16381)
/* Minimum normalised long double */
#undef LDBL_MIN
#define LDBL_MIN (__extension__ ((union __convert_long_double) {0x0, 0x80000000,
0x1, 0x0}).__convert_long_double_d)
/* Minimum int x such that 10**x is a normalised long double */
#undef LDBL_MIN_10_EXP
#define LDBL_MIN_10_EXP (-4931)
/* Maximum int x such that FLT_RADIX**(x-1) is a representable long double */
#undef LDBL_MAX_EXP
#define LDBL_MAX_EXP 16384
/* Maximum long double */
#undef LDBL_MAX
#define LDBL_MAX (__extension__ ((union __convert_long_double) {0xffffffff, 0xff
ffffff, 0x107ffe, 0x0}).__convert_long_double_d)
/* Maximum int x such that 10**x is a representable long double */
#undef LDBL_MAX_10_EXP
#define LDBL_MAX_10_EXP 4932
#endif /* _FLOAT_H___ */
When initializing the int array in the union __convert_long_double, only a
single pair of braces is used, but since initialization rules apply
recursively, a pair is needed for both the union itself and the array.
Without them, innocent programs can generate compiler warnings.
Use the following code, compiled with -Wall, to demonstrate this:
#include <stdio.h>
#include <float.h>
void main(void)
{
/* These next two lines both generate this message:
* warning: missing braces around initializer for
* `(anonymous).__convert_long_double_i'
*/
printf("long double minimum = %Le\n", LDBL_MIN);
printf("long double maximum = %Le\n", LDBL_MAX);
}
This is probably something for the upstream maintainer.
-- System Information
Debian Release: 1.2
Kernel Version: Linux apocalypse 2.0.20 #1 Sat Sep 14 04:03:34 EST 1996 i486
Versions of the packages this package depends on:
libc5 Version: 5.4.13-1
-- bug report generated by the debmake bug tool
--
"If a man ate a pound of pasta and a pound of | G. Branden Robinson
antipasto, would they cancel out, leaving him | Purdue University
still hungry?" -- Scott Adams | branden@purdue.edu
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Date: Thu, 12 Apr 2001 23:52:39 +0200 (MEST)
To: 4429-done@bugs.debian.org, 4430-done@bugs.debian.org,
4954-done@bugs.debian.org, 5367-done@bugs.debian.org,
6047-done@bugs.debian.org, 12375-done@bugs.debian.org,
20606-done@bugs.debian.org, 20889-done@bugs.debian.org,
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54544-done@bugs.debian.org, 63154-done@bugs.debian.org
Subject: closing gcc272 bugs
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Message-ID: <15062.8940.590633.88211@bolero>
Delivered-To: 6047-done@bugs.debian.org
gcc272 (2.7.2.3-18) unstable; urgency=low
* Close all gcc272 in the Debian bug tracking archive. The use of
gcc272 is deprecated. The only reason it exists is to have a
compiler for the linux kernel 2.0.x.
The bug reports for gcc272 are still available on
http://bugs.debian.org/cgi-bin/pkgreport.cgi?pkg=gcc272&archive=yes
Closes: #4429, #4430, 4954, #5367, #6047, #12375, #20606, #20889,
#24788, #26100, #34322, #48726, #54544, #63154.
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