Created attachment 53217 [details] Preprocessed file (compressed) The following code triggers a segfault. Tested with g++ 10.3.0, -O0 to -O3 /* starts here */ template<typename ... T> struct DataStructure { }; template<size_t N> struct StringLiteral { constexpr StringLiteral (const char (&str)[N]) { std::copy_n(str, N, value); } constexpr auto operator<=>(const StringLiteral&) const = default; constexpr bool operator==(const StringLiteral&) const = default; static constexpr auto len = N; char value[N]; }; //////////////////////////////////////////////////////////////////////// template <StringLiteral Name, typename T> struct Item { constexpr static auto item_name = Name; T data; }; //////////////////////////////////////////////////////////////////////// template <StringLiteral Target, typename... Rest> struct Test { static constexpr auto eq = false; }; template <StringLiteral Target, typename First, typename... Rest> struct Test<Target, First, Rest...> { static constexpr auto eq = (Target == First::item_name) || Test<Target, Rest...>::eq; }; //////////////////////////////////////////////////////////////////////// template<typename T, typename ... Rest> struct DataStructure<T, Rest ...> { constexpr DataStructure() : first() , rest() { // this line! static_assert(!Test<T::item_name, Rest...>::eq, "repeated id in data structure"); } T first; DataStructure<Rest ... > rest; }; DataStructure< Item<"Ident::ZUM", int>, Item<"Ident::FOO", float>, Item<"Ident::BAR", float> > data; /* ends here */ g++-10 -save-temps -std=c++2a test_segfault.cpp test_segfault.cpp: In constructor ‘constexpr DataStructure<T, Rest ...>::DataStructure()’: test_segfault.cpp:58:50: internal compiler error: Segmentation fault 58 | static_assert(!Test<T::item_name, Rest...>::eq, "repeated id in data structure"); | ^ 0x7f3d44ebe08f ??? /build/glibc-SzIz7B/glibc-2.31/signal/../sysdeps/unix/sysv/linux/x86_64/sigaction.c:0 0x7f3d44e9f082 __libc_start_main ../csu/libc-start.c:308 Please submit a full bug report, with preprocessed source if appropriate. Please include the complete backtrace with any bug report. See <file:///usr/share/doc/gcc-10/README.Bugs> for instructions. make: *** [Makefile:2: all] Error 1 ////////////////////////////////////////////////////////////////////////////////////// Compiler info: Using built-in specs. COLLECT_GCC=g++-10 COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/10/lto-wrapper OFFLOAD_TARGET_NAMES=nvptx-none:amdgcn-amdhsa:hsa OFFLOAD_TARGET_DEFAULT=1 Target: x86_64-linux-gnu Configured with: ../src/configure -v --with-pkgversion='Ubuntu 10.3.0-1ubuntu1~20.04' --with-bugurl=file:///usr/share/doc/gcc-10/README.Bugs --enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++,m2 --prefix=/usr --with-gcc-major-version-only --program-suffix=-10 --program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --enable-bootstrap --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-vtable-verify --enable-plugin --enable-default-pie --with-system-zlib --enable-libphobos-checking=release --with-target-system-zlib=auto --enable-objc-gc=auto --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-offload-targets=nvptx-none=/build/gcc-10-S4I5Pr/gcc-10-10.3.0/debian/tmp-nvptx/usr,amdgcn-amdhsa=/build/gcc-10-S4I5Pr/gcc-10-10.3.0/debian/tmp-gcn/usr,hsa --without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu --with-build-config=bootstrap-lto-lean --enable-link-mutex Thread model: posix Supported LTO compression algorithms: zlib zstd gcc version 10.3.0 (Ubuntu 10.3.0-1ubuntu1~20.04)
Command line: g++-10 -save-temps -std=c++2a test_segfault.cpp
I think this was fixed in GCC 11.
Dup. *** This bug has been marked as a duplicate of bug 95291 ***