Maybe Ben or Brian can comment.
* Erik Johansson <[EMAIL PROTECTED]> [2007-09-02 00:39]:
> 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.
>
> -- no debconf information
>
>
> --
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--
Martin Michlmayr
http://www.cyrius.com/
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