https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63296
Bug ID: 63296
Summary: g++ reports incomplete type for static template member
of template class
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: rogier777 at gmail dot com
G++ fails to compile the following code. IMHO, as 'staticmember' is a static
member, the code is valid and should be accepted.
Moving 'staticmember' outside the class (making it a plain static variable),
makes g++ accept the code.
Making 'myclass' a regular (non-template) class instead makes g++ accept the
code as well.
Code:
---------------------------------------------------
template<class c>
struct list {
c member;
};
template<class c>
struct myclass {
static list<myclass> staticmember;
};
myclass<int> myvar;
---------------------------------------------------
Compilation output (extended version with '-v -save-temps' below):
---------------------------------------------------
$ g++ -W -Wall --std=c++11 -o /dev/null try_01c.cc
try_01c.cc: In instantiation of ‘struct list<myclass<int> >’:
try_01c.cc:9:26: required from ‘struct myclass<int>’
try_01c.cc:12:14: required from here
try_01c.cc:4:7: error: ‘list<c>::member’ has incomplete type
c member;
^
try_01c.cc:8:8: error: declaration of ‘struct myclass<int>’
struct myclass {
^
---------------------------------------------------
G++ version: 4.9
(Stock debian package version 4.9.1-14)
Detailed compiler output with '-v -save-temps':
---------------------------------------------------
$ g++ -W -Wall --std=c++11 -v -save-temps -o /dev/null try_01c.cc
Using built-in specs.
COLLECT_GCC=/usr/bin/g++-4.9.real
COLLECT_LTO_WRAPPER=/usr/lib/gcc/i586-linux-gnu/4.9/lto-wrapper
Target: i586-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 4.9.1-14'
--with-bugurl=file:///usr/share/doc/gcc-4.9/README.Bugs
--enable-languages=c,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr
--program-suffix=-4.9 --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--with-gxx-include-dir=/usr/include/c++/4.9 --libdir=/usr/lib --enable-nls
--with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug
--enable-libstdcxx-time=yes --enable-gnu-unique-object --disable-vtable-verify
--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-4.9-i386/jre --enable-java-home
--with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-4.9-i386
--with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-4.9-i386
--with-arch-directory=i386 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar
--enable-objc-gc --enable-targets=all --enable-multiarch --with-arch-32=i586
--with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic
--enable-checking=release --build=i586-linux-gnu --host=i586-linux-gnu
--target=i586-linux-gnu
Thread model: posix
gcc version 4.9.1 (Debian 4.9.1-14)
COLLECT_GCC_OPTIONS='-Wextra' '-Wall' '-std=c++11' '-v' '-save-temps' '-o'
'/dev/null' '-shared-libgcc' '-mtune=generic' '-march=i586'
/usr/lib/gcc/i586-linux-gnu/4.9/cc1plus -E -quiet -v -imultiarch
i386-linux-gnu -D_GNU_SOURCE try_01c.cc -mtune=generic -march=i586 -std=c++11
-Wextra -Wall -fpch-preprocess -o try_01c.ii
ignoring duplicate directory "/usr/include/i386-linux-gnu/c++/4.9"
ignoring nonexistent directory "/usr/local/include/i386-linux-gnu"
ignoring nonexistent directory
"/usr/lib/gcc/i586-linux-gnu/4.9/../../../../i586-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/include/c++/4.9
/usr/include/i386-linux-gnu/c++/4.9
/usr/include/c++/4.9/backward
/usr/lib/gcc/i586-linux-gnu/4.9/include
/usr/local/include
/usr/lib/gcc/i586-linux-gnu/4.9/include-fixed
/usr/include/i386-linux-gnu
/usr/include
End of search list.
COLLECT_GCC_OPTIONS='-Wextra' '-Wall' '-std=c++11' '-v' '-save-temps' '-o'
'/dev/null' '-shared-libgcc' '-mtune=generic' '-march=i586'
/usr/lib/gcc/i586-linux-gnu/4.9/cc1plus -fpreprocessed try_01c.ii -quiet
-dumpbase try_01c.cc -mtune=generic -march=i586 -auxbase try_01c -Wextra -Wall
-std=c++11 -version -o try_01c.s
GNU C++ (Debian 4.9.1-14) version 4.9.1 (i586-linux-gnu)
compiled by GNU C version 4.9.1, GMP version 6.0.0, MPFR version
3.1.2-p3, MPC version 1.0.2
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
GNU C++ (Debian 4.9.1-14) version 4.9.1 (i586-linux-gnu)
compiled by GNU C version 4.9.1, GMP version 6.0.0, MPFR version
3.1.2-p3, MPC version 1.0.2
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: 4eca7bfa4a918deb01db62dfdef571b2
try_01c.cc: In instantiation of ‘struct list<myclass<int> >’:
try_01c.cc:9:26: required from ‘struct myclass<int>’
try_01c.cc:12:14: required from here
try_01c.cc:4:7: error: ‘list<c>::member’ has incomplete type
c member;
^
try_01c.cc:8:8: error: declaration of ‘struct myclass<int>’
struct myclass {
^
---------------------------------------------------
