https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87709
Bug ID: 87709
Summary: c++17 class template argument deduction not working in
a very specific case
Product: gcc
Version: 8.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: bmburstein at gmail dot com
Target Milestone: ---
Created attachment 44883
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44883&action=edit
test case
The test case is attached. It has no includes and so I am attaching the *.cpp
file as per https://gcc.gnu.org/bugs/
I am compiling with -std=c++17
Output of g++ -v:
# g++ -v
Using built-in specs.
COLLECT_GCC=C:\MyProgs\msys64\mingw64\bin\g++.exe
COLLECT_LTO_WRAPPER=C:/MyProgs/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/8.2.0/lto-wrapper.exe
Target: x86_64-w64-mingw32
Configured with: ../gcc-8.2.0/configure --prefix=/mingw64
--with-local-prefix=/mingw64/local --build=x86_64-w64-mingw32
--host=x86_64-w64-mingw32 --target=x86_64-w64-mingw32
--with-native-system-header-dir=/mingw64/x86_64-w64-mingw32/include
--libexecdir=/mingw64/lib --enable-bootstrap --with-arch=x86-64
--with-tune=generic --enable-languages=ada,c,lto,c++,objc,obj-c++,fortran
--enable-shared --enable-static --enable-libatomic --enable-threads=posix
--enable-graphite --enable-fully-dynamic-string
--enable-libstdcxx-filesystem-ts=yes --enable-libstdcxx-time=yes
--disable-libstdcxx-pch --disable-libstdcxx-debug --disable-isl-version-check
--enable-lto --enable-libgomp --disable-multilib --enable-checking=release
--disable-rpath --disable-win32-registry --disable-nls --disable-werror
--disable-symvers --with-libiconv --with-system-zlib --with-gmp=/mingw64
--with-mpfr=/mingw64 --with-mpc=/mingw64 --with-isl=/mingw64
--with-pkgversion='Rev3, Built by MSYS2 project'
--with-bugurl=https://sourceforge.net/projects/msys2 --with-gnu-as
--with-gnu-ld
Thread model: posix
gcc version 8.2.0 (Rev3, Built by MSYS2 project)
I tried with another build and got the same results. This one gave:
# g++ -v
Using built-in specs.
COLLECT_GCC=/opt/wandbox/gcc-8.2.0/bin/g++
COLLECT_LTO_WRAPPER=/opt/wandbox/gcc-8.2.0/libexec/gcc/x86_64-pc-linux-gnu/8.2.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-8.2.0/configure --prefix=/opt/wandbox/gcc-8.2.0
--enable-languages=c,c++ --disable-multilib --without-ppl --without-cloog-ppl
--enable-checking=release --disable-nls
LDFLAGS=-Wl,-rpath,/opt/wandbox/gcc-8.2.0/lib,-rpath,/opt/wandbox/gcc-8.2.0/lib64,-rpath,/opt/wandbox/gcc-8.2.0/lib32
--enable-lto
Thread model: posix
gcc version 8.2.0 (GCC)
