http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57942
Bug ID: 57942
Summary: g++-4.8.1 tries to instantiate wrong constructor
(C++11)
Product: gcc
Version: 4.8.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: david-gcc at klaftenegger dot de
Created attachment 30532
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30532&action=edit
code exampe to trigger the bug
In the attached small C++11 code example g++ tries to instantiate the second
constructor of MyClass<int, false>, which should not happen.
As this code never requires MyClass<int, true>, it should compile, but due to
this useless instantiation g++ rejects the code.
To trigger the problem just run
$ g++-4.8 -std=c++11 g++-bug.cpp
This produces the following error output:
g++-bug.cpp: In instantiation of "class MyClass<int, true>":
g++-bug.cpp:26:27: required from here
g++-bug.cpp:6:7: error: base type "int" fails to be a struct or class type
Here is the exact compiler version used:
$ g++-4.8 -v
Using built-in specs.
COLLECT_GCC=g++-4.8
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.8/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu
4.8.1-2ubuntu1~13.04' --with-bugurl=file:///usr/share/doc/gcc-4.8/README.Bugs
--enable-languages=c,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr
--program-suffix=-4.8 --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--with-gxx-include-dir=/usr/include/c++/4.8 --libdir=/usr/lib --enable-nls
--with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug
--enable-libstdcxx-time=yes --enable-gnu-unique-object --enable-plugin
--with-system-zlib --disable-browser-plugin --enable-java-awt=gtk
--enable-gtk-cairo --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-4.8-amd64/jre
--enable-java-home --with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-4.8-amd64
--with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-4.8-amd64
--with-arch-directory=amd64 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar
--enable-objc-gc --enable-multiarch --disable-werror --with-arch-32=i686
--with-abi=m64 --with-multilib-list=m32,m64,mx32 --with-tune=generic
--enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu
--target=x86_64-linux-gnu
Thread model: posix
gcc version 4.8.1 (Ubuntu 4.8.1-2ubuntu1~13.04)
