https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100825
Bug ID: 100825
Summary: function signature constraints are not a part of
mangled name
Product: gcc
Version: 11.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: vopl at bk dot ru
Target Milestone: ---
$ cat b.cpp && echo EOFFFFFF
template <class T> void foo() // 1
{}
template <class T> void foo() requires (sizeof(char) == sizeof(T)) // 2
{
foo<int>();// call 1 - instantiate "void foo<int>()"
}
template <class T> void foo() requires (sizeof(int) == sizeof(T)) // 3
{}
void use()
{
foo<char>(); // call 2
foo<int>(); // call 3 - instantiate "void foo<int>() requires (sizeof(int)
== sizeof(T))"
}
// so, two different function instantiated with same mangled name
EOFFFFFF
$ g++ -std=c++20 -v -c b.cpp
Using built-in specs.
COLLECT_GCC=g++
Target: x86_64-pc-linux-gnu
Configured with:
/var/tmp/portage/sys-devel/gcc-10.2.0-r5/work/gcc-10.2.0/configure
--host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --prefix=/usr
--bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/10.2.0
--includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/include
--datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/10.2.0
--mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/10.2.0/man
--infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/10.2.0/info
--with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/include/g++-v10
--with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/10.2.0/python
--enable-languages=c,c++,fortran --enable-obsolete --enable-secureplt
--disable-werror --with-system-zlib --disable-nls --enable-checking=release
--with-bugurl=https://bugs.gentoo.org/ --with-pkgversion='Gentoo 10.2.0-r5 p6'
--disable-esp --enable-libstdcxx-time --with-build-config=bootstrap-lto
--enable-shared --enable-threads=posix --enable-__cxa_atexit
--enable-clocale=gnu --enable-multilib --with-multilib-list=m32,m64
--disable-fixed-point --enable-targets=all --enable-libgomp --disable-libssp
--disable-libada --enable-systemtap --enable-vtable-verify --with-zstd
--enable-lto --with-isl --disable-isl-version-check --enable-default-pie
--disable-default-ssp
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 10.2.0 (Gentoo 10.2.0-r5 p6)
COLLECT_GCC_OPTIONS='-std=c++2a' '-v' '-c' '-shared-libgcc' '-mtune=generic'
'-march=x86-64'
/usr/libexec/gcc/x86_64-pc-linux-gnu/10.2.0/cc1plus -quiet -v -D_GNU_SOURCE
b.cpp -quiet -dumpbase b.cpp -mtune=generic -march=x86-64 -auxbase b -std=c++2a
-version -o /tmp/ccdHBZw0.s
GNU C++17 (Gentoo 10.2.0-r5 p6) version 10.2.0 (x86_64-pc-linux-gnu)
compiled by GNU C version 10.2.0, GMP version 6.2.1, MPFR version
4.1.0, MPC version 1.2.1, isl version isl-0.23-GMP
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
ignoring nonexistent directory "/usr/local/include"
ignoring nonexistent directory
"/usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../x86_64-pc-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/include/g++-v10
/usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/include/g++-v10/x86_64-pc-linux-gnu
/usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/include/g++-v10/backward
/usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/include
/usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/include-fixed
/usr/include
End of search list.
GNU C++17 (Gentoo 10.2.0-r5 p6) version 10.2.0 (x86_64-pc-linux-gnu)
compiled by GNU C version 10.2.0, GMP version 6.2.1, MPFR version
4.1.0, MPC version 1.2.1, isl version isl-0.23-GMP
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: 109a96b688365221cca69113b161e683
COLLECT_GCC_OPTIONS='-std=c++2a' '-v' '-c' '-shared-libgcc' '-mtune=generic'
'-march=x86-64'
/usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../x86_64-pc-linux-gnu/bin/as
-v --64 -o b.o /tmp/ccdHBZw0.s
GNU assembler version 2.35.2 (x86_64-pc-linux-gnu) using BFD version (Gentoo
2.35.2 p1) 2.35.2
/tmp/ccdHBZw0.s: Assembler messages:
/tmp/ccdHBZw0.s:61: Error: symbol `_Z3fooIiEvv' is already defined
---------------
My expectations: mangled names must be different, because mangled name is based
on the signature and a signature includes the requires-clause as a part
