https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98475
Bug ID: 98475
Summary: Class template argument deduction for alias templates
fails
Product: gcc
Version: 10.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: kimhappy at hanyang dot ac.kr
Target Milestone: ---
Created attachment 49857
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=49857&action=edit
Example case
[Environment]
OS: Arch Linux on Windows 10 x86_64
Kernel: 4.19.128-microsoft-standard
[Compile command]
g++ -std=c++20 -Wall -Wextra
[Output]
test.cpp: In function ‘int main()’:
test.cpp:15:21: internal compiler error: Segmentation fault
15 | auto o1 = SSS(10);
| ^
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://bugs.archlinux.org/> for instructions.
[Output of g++ -v]
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /build/gcc/src/gcc/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++,d --with-isl
--with-linker-hash-style=gnu --with-system-zlib --enable-__cxa_atexit
--enable-cet=auto --enable-checking=release --enable-clocale=gnu
--enable-default-pie --enable-default-ssp --enable-gnu-indirect-function
--enable-gnu-unique-object --enable-install-libiberty --enable-linker-build-id
--enable-lto --enable-multilib --enable-plugin --enable-shared
--enable-threads=posix --disable-libssp --disable-libstdcxx-pch
--disable-libunwind-exceptions --disable-werror
gdc_include_dir=/usr/include/dlang/gdc
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 10.2.0 (GCC)
[Description]
Class template argument deduction for alias templates fails with some cases. I
tested it in various environments, but the results were the same.
In example case that I attached, if I replace T3 with a non-template template
argument or remove the second constructor of SS, it compiles fine.
