Public bug reported:
Environment
-----------
* GCC version:
* gcc version 13.3.0 (Ubuntu 13.3.0-6ubuntu2~24.04)
* Target:
* x86_64-linux-gnu
* Configure options (from g++ -v):
* Configured with: ../src/configure -v --with-pkgversion='Ubuntu
13.3.0-6ubuntu2~24.04' --with-bugurl=file:///usr/share/doc/gcc-13/README.Bugs
--enable-languages=c,ada,c++,go,d,fortran,objc,obj-c++,m2 --prefix=/usr
--with-gcc-major-version-only --program-suffix=-13
--program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id
--libexecdir=/usr/libexec --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-libstdcxx-backtrace
--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 --enable-cet --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-13-fG75Ri/gcc-13-13.3.0/debian/tmp-nvptx/usr,amdgcn-amdhsa=/build/gcc-13-fG75Ri/gcc-13-13.3.0/debian/tmp-gcn/usr
--enable-offload-defaulted --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-serialization=2
System type
-----------
* x86_64-linux-gnu on Ubuntu 24.04.
Minimal reproducer (gcc_ice_min7.cpp)
-------------------------------------
It is reduced to what appears to be the smallest form that still crashes
GCC. Removing any piece tends to avoid the ICE.
template <int* Ptr>
struct StaticIntPtr {};
template <typename P>
struct S {
union { P payload; };
S() {}
};
S<int> n{};
S<StaticIntPtr<&n.payload>> m;
int main() { return 0; }
Command line to reproduce
-------------------------
* g++ -std=c++20 -O2 -Wall -Wextra -pedantic -v -o gcc_ice_min7.gcc
gcc_ice_min7.cpp
Compiler output
---------------
* Excerpt from a failing build (segmentation fault/ICE):
$ g++ -std=c++20 -O2 -Wall -Wextra -pedantic -o gcc_ice_min7 gcc_ice_min7.cpp
gcc_ice_min7.cpp: In instantiation of ‘S<P>::S() [with P = StaticIntPtr<(&
n.S<int>::<anonymous>.S<int>::<unnamed union>::payload)>]’:
gcc_ice_min7.cpp:7:10: required from ‘S<P>::S() [with P = StaticIntPtr<(&
n.S<int>::<anonymous>.S<int>::<unnamed union>::payload)>]’
gcc_ice_min7.cpp:11:29: required from here
gcc_ice_min7.cpp:7:5: internal compiler error: Нарушение на
разделянето(segfault)
7 | S() {}
| ^
0x70b3b6a4532f ???
./signal/../sysdeps/unix/sysv/linux/x86_64/libc_sigaction.c:0
0x70b3b6a2a1c9 __libc_start_call_main
../sysdeps/nptl/libc_start_call_main.h:58
0x70b3b6a2a28a __libc_start_main_impl
../csu/libc-start.c:360
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <file:///usr/share/doc/gcc-13/README.Bugs> for instructions.
Observed behavior
-----------------
* GCC 13.3.0 crashes with an ICE (segmentation fault) when compiling the above
code.
* Clang (tested with libc++) compiles similar patterns without error.
Expected behavior
-----------------
* The code should either compile or be rejected with a diagnostic, but
it should not cause an internal compiler error.
Notes
-----
* The reproducer uses:
* A single NTTP overall (pointer to subobject &n.payload embedded in the type
parameter P = StaticIntPtr<&n.payload>).
* A simple anonymous union { P payload; } inside S.
* Static objects n and m in the same translation unit.
* The ICE seems tied to using the address of an anonymous union/struct
subobject as an NTTP. The program compiles if instead of the anonymous union,
a named union is used.
Attachment
----------
Preprocessed source produced by:
* g++ -std=c++20 -E gcc_ice_min7.cpp -o gcc_ice_min7.ii
** Affects: gcc-13 (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "Preprocessed source"
https://bugs.launchpad.net/bugs/2122360/+attachment/5907855/+files/gcc_ice_min7.ii
--
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https://bugs.launchpad.net/bugs/2122360
Title:
GCC 13.3.0 ICE: pointer to subobject used as non-type template
parameter in minimal template instantiation (anonymous union member)
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