https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118826
Bug ID: 118826
Summary: segmentation fault compiling a module fragment
containing an exported struct with a default virtual
destructor
Product: gcc
Version: 14.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: rarrum at gmail dot com
Target Milestone: ---
Created attachment 60456
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=60456&action=edit
Complete tiny program to reproduce the compiler crash
I ran into "internal compiler error: Segmentation fault" while working on a new
program where I've been trying out c++ modules. I managed to narrow it down to
a very tiny program, which I've attached (can be built using xmake).
It essentially amounts to compiling this module fragment:
module;
export module WorldState:Timeline;
export struct TimelineChange
{
virtual ~TimelineChange() = default;
virtual void Apply(int &world) = 0;
};
export struct TimelineSplit final : public TimelineChange
{
void Apply(int &world) override { }
};
With this module interface file:
module;
export module WorldState;
export import :Timeline;
Below is the full output from running the gcc command with -v and -save-temps
(which as far as I can tell isn't producing a temp file unfortunately). Xmake
runs a series of gcc commands, this in the final one that crashes:
/usr/bin/gcc -c -m64 -fvisibility=hidden -fvisibility-inlines-hidden -Wall -O3
-std=c++20 -fexceptions -fmodules-ts -D_GLIBCXX_USE_CXX11_ABI=0 -DNDEBUG
-fmodule-mapper=/tmp/.xmake1000/250210/BugRepro/src/WorldState/WorldState.ixx
-x c++ -o
build/.objs/BugRepro/linux/x86_64/release/src/WorldState/WorldState.ixx.o
src/WorldState/WorldState.ixx -v -save-temps
Using built-in specs.
COLLECT_GCC=/usr/bin/gcc
OFFLOAD_TARGET_NAMES=nvptx-none:amdgcn-amdhsa
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu
14.2.0-4ubuntu2~24.04' --with-bugurl=file:///usr/share/doc/gcc-14/README.Bugs
--enable-languages=c,ada,c++,go,d,fortran,objc,obj-c++,m2,rust --prefix=/usr
--with-gcc-major-version-only --program-suffix=-14
--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-14-ig5ci0/gcc-14-14.2.0/debian/tmp-nvptx/usr,amdgcn-amdhsa=/build/gcc-14-ig5ci0/gcc-14-14.2.0/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
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 14.2.0 (Ubuntu 14.2.0-4ubuntu2~24.04)
COLLECT_GCC_OPTIONS='-c' '-m64' '-fvisibility=hidden'
'-fvisibility-inlines-hidden' '-Wall' '-O3' '-std=c++20' '-fexceptions'
'-fmodules-ts' '-D' '_GLIBCXX_USE_CXX11_ABI=0' '-D' 'NDEBUG'
'-fmodule-mapper=/tmp/.xmake1000/250210/BugRepro/src/WorldState/WorldState.ixx'
'-o'
'build/.objs/BugRepro/linux/x86_64/release/src/WorldState/WorldState.ixx.o'
'-v' '-save-temps' '-mtune=generic' '-march=x86-64' '-dumpdir'
'build/.objs/BugRepro/linux/x86_64/release/src/WorldState/'
/usr/libexec/gcc/x86_64-linux-gnu/14/cc1plus -E -quiet -v -imultiarch
x86_64-linux-gnu -D_GNU_SOURCE -D _GLIBCXX_USE_CXX11_ABI=0 -D NDEBUG
src/WorldState/WorldState.ixx -m64 -mtune=generic -march=x86-64 -std=c++20
-Wall -fvisibility=hidden -fvisibility-inlines-hidden -fexceptions -fmodules-ts
-fmodule-mapper=/tmp/.xmake1000/250210/BugRepro/src/WorldState/WorldState.ixx
-O3 -fpch-preprocess -D_FORTIFY_SOURCE=3 -fasynchronous-unwind-tables
-fstack-protector-strong -Wformat-security -fstack-clash-protection
-fcf-protection -o
build/.objs/BugRepro/linux/x86_64/release/src/WorldState/WorldState.ixx.ii
ignoring duplicate directory "/usr/include/x86_64-linux-gnu/c++/14"
ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"
ignoring nonexistent directory
"/usr/lib/gcc/x86_64-linux-gnu/14/include-fixed/x86_64-linux-gnu"
ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/14/include-fixed"
ignoring nonexistent directory
"/usr/lib/gcc/x86_64-linux-gnu/14/../../../../x86_64-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/include/c++/14
/usr/include/x86_64-linux-gnu/c++/14
/usr/include/c++/14/backward
/usr/lib/gcc/x86_64-linux-gnu/14/include
/usr/local/include
/usr/include/x86_64-linux-gnu
/usr/include
End of search list.
COLLECT_GCC_OPTIONS='-c' '-m64' '-fvisibility=hidden'
'-fvisibility-inlines-hidden' '-Wall' '-O3' '-std=c++20' '-fexceptions'
'-fmodules-ts' '-D' '_GLIBCXX_USE_CXX11_ABI=0' '-D' 'NDEBUG'
'-fmodule-mapper=/tmp/.xmake1000/250210/BugRepro/src/WorldState/WorldState.ixx'
'-o'
'build/.objs/BugRepro/linux/x86_64/release/src/WorldState/WorldState.ixx.o'
'-v' '-save-temps' '-mtune=generic' '-march=x86-64' '-dumpdir'
'build/.objs/BugRepro/linux/x86_64/release/src/WorldState/'
/usr/libexec/gcc/x86_64-linux-gnu/14/cc1plus -fpreprocessed
build/.objs/BugRepro/linux/x86_64/release/src/WorldState/WorldState.ixx.ii
-D_FORTIFY_SOURCE=3 -quiet -dumpdir
build/.objs/BugRepro/linux/x86_64/release/src/WorldState/ -dumpbase
WorldState.ixx.ixx -dumpbase-ext .ixx -m64 -mtune=generic -march=x86-64 -O3
-Wall -std=c++20 -version -fvisibility=hidden -fvisibility-inlines-hidden
-fexceptions -fmodules-ts
-fmodule-mapper=/tmp/.xmake1000/250210/BugRepro/src/WorldState/WorldState.ixx
-fasynchronous-unwind-tables -fstack-protector-strong -Wformat-security
-fstack-clash-protection -fcf-protection -o
build/.objs/BugRepro/linux/x86_64/release/src/WorldState/WorldState.ixx.s
GNU C++20 (Ubuntu 14.2.0-4ubuntu2~24.04) version 14.2.0 (x86_64-linux-gnu)
compiled by GNU C version 14.2.0, GMP version 6.3.0, MPFR version
4.2.1, MPC version 1.3.1, isl version isl-0.26-GMP
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: 15295618e53100c52860079ea59d3eac
src/WorldState/WorldState.ixx: In destructor ‘constexpr
TimelineChange@WorldState:Timeline::~TimelineChange()’:
src/WorldState/WorldState.ixx:5:27: internal compiler error: Segmentation fault
5 | export import :Timeline;
| ^
0x78b0c264531f ???
./signal/../sysdeps/unix/sysv/linux/x86_64/libc_sigaction.c:0
0x78b0c262a1c9 __libc_start_call_main
../sysdeps/nptl/libc_start_call_main.h:58
0x78b0c262a28a __libc_start_main_impl
../csu/libc-start.c:360
