https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96474
Bug ID: 96474
Summary: Internal compiler error with template struct inside
template struct
Product: gcc
Version: 10.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: lhlaurini at hotmail dot com
Target Milestone: ---
Tested on Arch Linux (10.1.0) and on the online compiler godbolt.org (10.1.0,
10.2.0 and trunk), all with the same results. The following code (compile with
"g++ test.cpp -std=c++17"):
template <typename T>
struct A
{
template <typename U = T>
struct B
{
//B() {}
};
};
A<int>::B x;
outputs:
<source>: In substitution of 'template<class U> B()-> A<int>::B<U> [with U
= int]':
<source>:11:11: required from here
<source>:5:12: internal compiler error: in retrieve_specialization, at
cp/pt.c:1240
5 | struct B
| ^
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://gcc.gnu.org/bugs/> for instructions.
Uncommenting "B() {}", it compiles fine (doesn't link, of course). Bug is not
present on 9.3 (also tested on godbolt.org).
---
Godbolt.org with "x86-64 gcc 9.3":
Target: x86_64-linux-gnu
Configured with: ../gcc-9.3.0/configure
--prefix=/opt/compiler-explorer/gcc-build/staging --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu --disable-bootstrap
--enable-multiarch --with-abi=m64 --with-multilib-list=m32,m64,mx32
--enable-multilib --enable-clocale=gnu
--enable-languages=c,c++,fortran,ada,go,d --enable-ld=yes --enable-gold=yes
--enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-linker-build-id
--enable-lto --enable-plugins --enable-threads=posix
--with-pkgversion=Compiler-Explorer-Build
Thread model: posix
gcc version 9.3.0 (Compiler-Explorer-Build)
---
Godbolt.org with "x86-64 gcc 10.2":
Target: x86_64-linux-gnu
Configured with: ../gcc-10.2.0/configure
--prefix=/opt/compiler-explorer/gcc-build/staging --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu --disable-bootstrap
--enable-multiarch --with-abi=m64 --with-multilib-list=m32,m64,mx32
--enable-multilib --enable-clocale=gnu
--enable-languages=c,c++,fortran,ada,go,d --enable-ld=yes --enable-gold=yes
--enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-linker-build-id
--enable-lto --enable-plugins --enable-threads=posix
--with-pkgversion=Compiler-Explorer-Build
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 10.2.0 (Compiler-Explorer-Build)
