https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122530
Bug ID: 122530
Summary: internal compiler error: Segmentation fault when
compiling c++modules with -Oz
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: abbyssoul at gmail dot com
Target Milestone: ---
Created attachment 62690
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=62690&action=edit
modules test file
When compiling C++23 modules example with `-Oz` flag, the compiler crashed
with:
```
/usr/include/c++/15/type_traits:180:12: internal compiler error: Segmentation
fault
180 | auto __or_fn(int) -> __first_t<false_type,
|
```
When compiled with any other value of `-0x` code compiles without errors.
> % gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-linux-gnu/14/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none:amdgcn-amdhsa
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu
14.2.0-19ubuntu2' --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-C86vgL/gcc-14-14.2.0/debian/tmp-nvptx/usr,amdgcn-amdhsa=/build/gcc-14-C86vgL/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 14.2.0-19ubuntu2)
> the complete command line that triggers the bug:
g++-15 -std=c++23 -fmodules -Oz -fsearch-include-path -c bits/std.cc && \
g++-15 -std=c++23 -fmodules -Oz -o bug.a -x c++ - <<< 'import std;
auto main()->int{std::println("Hello using C++ modules");}'
