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optimisation level > 0
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From: Bernard Blackham <[EMAIL PROTECTED]>
To: Debian Bug Tracking System <[EMAIL PROTECTED]>
Subject: g++-4.0: Fails to build attached code unless optimisation level > 0
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Date: Wed, 14 Sep 2005 00:23:51 +0800
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Package: g++-4.0
Version: 4.0.1-6
Severity: important
This code gives fails to link unless compiled with optimisation. -O1,
-O2, -O3..., or -Os all compile fine, just -O0 bombs out with:
$ g++-4.0 buggered.cpp
/tmp/cc25MWXo.o: In function `fp::operator>(fp const&) const':
buggered.cpp:(.gnu.linkonce.t._ZNK2fpgtERKS_[fp::operator>(fp const&)
const]+0x5): undefined reference to `fp::e'
collect2: ld returned 1 exit status
$ g++-4.0 -O2 buggered.cpp
$
buggered.cpp:
-- snip --
class fp {
static const double e = 0.00001;
double val;
public:
fp(double val) : val(val) {}
bool operator > (const fp& f) const { return e == 0; }
};
int main() {
fp f(1), g(2);
return f > g;
}
-- snip --
-- 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 2.6.13
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968)
Versions of packages g++-4.0 depends on:
ii gcc-4.0 4.0.1-6 The GNU C compiler
ii gcc-4.0-base 4.0.1-6 The GNU Compiler Collection (base
ii libc6 2.3.5-6 GNU C Library: Shared libraries an
ii libstdc++6-4.0-dev 4.0.1-6 The GNU Standard C++ Library v3 (d
g++-4.0 recommends no packages.
-- no debconf information
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To: [EMAIL PROTECTED]
Subject: Re: Bug#328119: g++-4.0: Fails to build attached code unless
optimisation level > 0
References: <[EMAIL PROTECTED]>
From: Falk Hueffner <[EMAIL PROTECTED]>
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Date: Tue, 13 Sep 2005 19:30:49 +0200
In-Reply-To: <[EMAIL PROTECTED]> (Bernard Blackham's message
of "Wed, 14 Sep 2005 00:23:51 +0800")
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Bernard Blackham <[EMAIL PROTECTED]> writes:
> This code gives fails to link unless compiled with optimisation. -O1,
> -O2, -O3..., or -Os all compile fine, just -O0 bombs out with:
>
> $ g++-4.0 buggered.cpp
> /tmp/cc25MWXo.o: In function `fp::operator>(fp const&) const':
> buggered.cpp:(.gnu.linkonce.t._ZNK2fpgtERKS_[fp::operator>(fp const&)
> const]+0x5): undefined reference to `fp::e'
> collect2: ld returned 1 exit status
> $ g++-4.0 -O2 buggered.cpp
> $
>
> buggered.cpp:
> -- snip --
> class fp {
> static const double e = 0.00001;
> double val;
> public:
> fp(double val) : val(val) {}
> bool operator > (const fp& f) const { return e == 0; }
> };
>
> int main() {
> fp f(1), g(2);
> return f > g;
> }
This is not a bug. Static class members need to be defined in some
compilation unit.
--
Falk
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