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[Bug c++/59816] New: [c++11] Incorrect visibility check in template instantiation when the default constructor is a variadic template.
- From: "libremax90 at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Wed, 15 Jan 2014 00:37:06 +0000
- Subject: [Bug c++/59816] New: [c++11] Incorrect visibility check in template instantiation when the default constructor is a variadic template.
- Auto-submitted: auto-generated
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59816
Bug ID: 59816
Summary: [c++11] Incorrect visibility check in template
instantiation when the default constructor is a
variadic template.
Product: gcc
Version: 4.8.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: libremax90 at gmail dot com
The following C++11 code won't compile on GCC 4.8.2 while clang++ will accept
it without a warning. In the following test case, GCC seems to check Base's
default constructor visibility in the test function's context, where the
templates are instantiated.
class Base {
protected:
template<class... TArgs>
Base(TArgs...) {}
// Uncomment to workaround
//Base() {}
};
class Class
: public Base {
public:
template<class... TArgs>
Class(TArgs... args) : Base { args... } {}
// Another workaround:
//Class() {}
};
void test() {
Class{};
}
Here is `g++ -v`'s output:
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-unknown-linux-gnu/4.8.2/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: /build/gcc/src/gcc-4.8-20131219/configure --prefix=/usr
--libdir=/usr/lib --libexecdir=/usr/lib --mandir=/usr/share/man
--infodir=/usr/share/info --with-bugurl=https://bugs.archlinux.org/
--enable-languages=c,c++,ada,fortran,go,lto,objc,obj-c++ --enable-shared
--enable-threads=posix --with-system-zlib --enable-__cxa_atexit
--disable-libunwind-exceptions --enable-clocale=gnu --disable-libstdcxx-pch
--disable-libssp --enable-gnu-unique-object --enable-linker-build-id
--enable-cloog-backend=isl --disable-cloog-version-check --enable-lto
--enable-plugin --enable-install-libiberty --with-linker-hash-style=gnu
--disable-multilib --disable-werror --enable-checking=release
Thread model: posix
gcc version 4.8.2 20131219 (prerelease) (GCC)