https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87714
Bug ID: 87714
Summary: [8 regresion] ICE on valid C++ code: in
type_dependent_expression_p, at cp/pt.c:25178
Product: gcc
Version: 8.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: development at jordi dot vilar.cat
Target Milestone: ---
Hi,
The issue appeared in g++ 8. It compiles ok in g++ 7.3, clang 6.0 and
VisualC++.
$> g++-8 -v -std=c++17 -c repro.cpp
Using built-in specs.
COLLECT_GCC=g++-8
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu
8.2.0-1ubuntu2~18.04' --with-bugurl=file:///usr/share/doc/gcc-8/README.Bugs
--enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++ --prefix=/usr
--with-gcc-major-version-only --program-suffix=-8
--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 --with-sysroot=/ --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes
--with-default-libstdcxx-abi=new --enable-gnu-unique-object
--disable-vtable-verify --enable-libmpx --enable-plugin --enable-default-pie
--with-system-zlib --with-target-system-zlib --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 --without-cuda-driver
--enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu
--target=x86_64-linux-gnu
Thread model: posix
gcc version 8.2.0 (Ubuntu 8.2.0-1ubuntu2~18.04)
COLLECT_GCC_OPTIONS='-v' '-std=c++17' '-c' '-shared-libgcc' '-mtune=generic'
'-march=x86-64'
/usr/lib/gcc/x86_64-linux-gnu/8/cc1plus -quiet -v -imultiarch x86_64-linux-gnu
-D_GNU_SOURCE repro.cpp -quiet -dumpbase repro.cpp -mtune=generic -march=x86-64
-auxbase repro -std=c++17 -version -fstack-protector-strong -Wformat
-Wformat-security -o /tmp/ccmOu14n.s
GNU C++17 (Ubuntu 8.2.0-1ubuntu2~18.04) version 8.2.0 (x86_64-linux-gnu)
compiled by GNU C version 8.2.0, GMP version 6.1.2, MPFR version 4.0.1,
MPC version 1.1.0, isl version isl-0.19-GMP
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
ignoring duplicate directory "/usr/include/x86_64-linux-gnu/c++/8"
ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"
ignoring nonexistent directory
"/usr/lib/gcc/x86_64-linux-gnu/8/../../../../x86_64-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/include/c++/8
/usr/include/x86_64-linux-gnu/c++/8
/usr/include/c++/8/backward
/usr/lib/gcc/x86_64-linux-gnu/8/include
/usr/local/include
/usr/lib/gcc/x86_64-linux-gnu/8/include-fixed
/usr/include/x86_64-linux-gnu
/usr/include
End of search list.
GNU C++17 (Ubuntu 8.2.0-1ubuntu2~18.04) version 8.2.0 (x86_64-linux-gnu)
compiled by GNU C version 8.2.0, GMP version 6.1.2, MPFR version 4.0.1,
MPC version 1.1.0, isl version isl-0.19-GMP
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: b531b606e797d462fe15d91f526b9496
repro.cpp: In instantiation of ‘static std::optional<_Tp> enum_helper<T,
is_bitmask>::to_enum(std::basic_string_view<char, U>) [with U =
std::char_traits<char>; T = my_enum_type; bool is_bitmask = true]’:
repro.cpp:34:113: required from here
repro.cpp:31:31: internal compiler error: in type_dependent_expression_p, at
cp/pt.c:25178
return parse_my_enum_type(syntax, { string.data(), string.size() });
^~~~~~
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-8/README.Bugs> for instructions.
repro.cpp ----------------------
#include <optional>
#include <regex>
#include <string_view>
template<typename T, bool is_bitmask = true> struct enum_helper
{
template<class U> static std::optional<T>
to_enum(std::basic_string_view<char, U> s);
};
template<class C> struct icase_char_traits : public std::char_traits<C>
{
static bool eq(C c1, C c2);
static bool lt(C c1, C c2);
static int compare(const C* s1, const C* s2, size_t n);
static const C* find(const C* s, size_t n, C a);
};
using ci_string_view = std::basic_string_view<char, icase_char_traits<char>>;
enum class my_enum_type : std::uint32_t;
template<> template<typename U> std::optional<my_enum_type>
enum_helper<my_enum_type, true>::to_enum(std::basic_string_view<char, U> s);
std::optional<my_enum_type> parse_my_enum_type(const std::regex &syntax,
std::string_view string);
template<> template<typename U> std::optional<my_enum_type>
enum_helper<my_enum_type>::to_enum(std::basic_string_view<char, U> string)
{
static const std::regex syntax(
R"(^...$)",
std::is_same_v<U, icase_char_traits<char>> ? std::regex::ECMAScript |
std::regex::icase : std::regex::ECMAScript);
return parse_my_enum_type(syntax, { string.data(), string.size() });
}
template std::optional<my_enum_type>
enum_helper<my_enum_type>::to_enum<std::char_traits<char>>(std::string_view);
template std::optional<my_enum_type>
enum_helper<my_enum_type>::to_enum<icase_char_traits<char>>(ci_string_view);
