Package: gcc-snapshot
Version: 20070829-1
Severity: normal
The following code compiles with g++ 4.2 but fails with "ISO C++ says
that these are ambiguous, even though the worst conversion for the
first is better than the worst conversion for the second" when
compiling with latest gcc-snapshot. If I remove the QString include it
compiles with gcc-snapshot.
// Flags needed: -I/usr/include/qt4/ -lQtCore
#include <QtCore/QString>
#include <QtCore/QByteArray>
int main()
{
if (QByteArray() == QByteArray())
return 1;
return 0;
}
Below is a simpler example that illustrates the same problem.
struct A {
A(const struct B&) {}
};
struct B {
bool operator==(const A&) const { return true; }
};
bool operator==(const B&, const B&) {
return false;
}
int main()
{
if (B() == B())
return 1;
return 0;
}
Is this a regression in gcc or is it something that must be fixed by
making A's constructor explicit?
// Erik
-- System Information:
Debian Release: lenny/sid
APT prefers unstable
APT policy: (500, 'unstable')
Architecture: i386 (i686)
Kernel: Linux 2.6.22-1-k7 (SMP w/1 CPU core)
Locale: LANG=en_DK.UTF-8, LC_CTYPE=sv_SE.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash
Versions of packages gcc-snapshot depends on:
ii binutils 2.18-1 The GNU assembler, linker and bina
ii lib64gcc1 1:4.2.1-4 GCC support library (64bit)
ii libasound2 1.0.14a-2 ALSA library
ii libatk1.0-0 1.18.0-2 The ATK accessibility toolkit
ii libc6 2.6.1-1+b1 GNU C Library: Shared libraries
ii libc6-amd64 2.6.1-1+b1 GNU C Library: 64bit Shared librar
ii libc6-dev 2.6.1-1+b1 GNU C Library: Development Librari
ii libcairo2 1.4.10-1 The Cairo 2D vector graphics libra
ii libfontconfig1 2.4.2-1.2 generic font configuration library
ii libfreetype6 2.3.5-1+b1 FreeType 2 font engine, shared lib
ii libgcc1 1:4.2.1-4 GCC support library
ii libgcj-bc 4.2.1-4 Link time only library for use wit
ii libglib2.0-0 2.14.0-2 The GLib library of C routines
ii libgmp3c2 2:4.2.1+dfsg-5 Multiprecision arithmetic library
ii libgtk2.0-0 2.10.13-1 The GTK+ graphical user interface
ii libice6 2:1.0.4-1 X11 Inter-Client Exchange library
ii libmpfr1ldbl 2.3.0.dfsg.1-2 multiple precision floating-point
ii libpango1.0-0 1.16.5-1 Layout and rendering of internatio
ii libpng12-0 1.2.15~beta5-2 PNG library - runtime
ii libsm6 2:1.0.3-1+b1 X11 Session Management library
ii libx11-6 2:1.0.3-7 X11 client-side library
ii libxcursor1 1:1.1.9-1 X cursor management library
ii libxext6 1:1.0.3-2 X11 miscellaneous extension librar
ii libxfixes3 1:4.0.3-2 X11 miscellaneous 'fixes' extensio
ii libxi6 2:1.1.2-1 X11 Input extension library
ii libxinerama1 1:1.0.2-1 X11 Xinerama extension library
ii libxrandr2 2:1.2.1-1 X11 RandR extension library
ii libxrender1 1:0.9.3-1 X Rendering Extension client libra
ii libxtst6 2:1.0.3-1 X11 Testing -- Resource extension
ii zlib1g 1:1.2.3.3.dfsg-5 compression library - runtime
gcc-snapshot recommends no packages.
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