[Bug c++/100433] New: [modules] segfault with optimization greater than -O0

[Bug c++/100433] New: [modules] segfault with optimization greater than -O0

[gavrilikhin.daniil at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100433

            Bug ID: 100433
           Summary: [modules] segfault with optimization greater than -O0
           Product: gcc
           Version: 11.1.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gavrilikhin.daniil at gmail dot com
  Target Milestone: ---

Created attachment 50760
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=50760&action=edit
2 preprocessed files

This code that uses modules with -O0 works well, but with -O1, -O2, or -O3
produces segfault. 

No flags were helpful (and -fsanitize=undefined does not work with modules.
There's already a bug report for it, however).

P.S: Tried it without modules - worked well with any optimization level. 

P.P.S: Additional info:

the exact version of GCC: 11.1.1 20210428 (GCC)

the system type: Ubuntu 21.04 hirsute

the options given when GCC was configured/built: (Default Ubuntu 21.04 g++-11)
../configure -v --with-bugurl=file:///usr/share/doc/gcc-11/README.Bugs
--enable-languages=c,c++,go,objc,obj-c++ --prefix=/usr
--with-gcc-major-version-only --program-suffix=-11
--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-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
--without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu
--target=x86_64-linux-gnu

the complete command line that triggers the bug:
g++-11 -g -O3 -std=c++20 -fmodules-ts -Wall -Wextra -Wpedantic
-fno-strict-aliasing -fwrapv -fno-aggressive-loop-optimizations oauth2.cpp
main.cpp

the compiler output (error messages, warnings, etc.): 
Nothing at compile time. Segmentation fault (core dumped) at runtime

[Bug c++/100433] [modules] segfault with optimization greater than -O0

[ppalka at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100433

Patrick Palka <ppalka at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
           See Also|                            |https://gcc.gnu.org/bugzill
                   |                            |a/show_bug.cgi?id=112588
         Resolution|---                         |FIXED
   Target Milestone|---                         |14.0
                 CC|                            |ppalka at gcc dot gnu.org

--- Comment #1 from Patrick Palka <ppalka at gcc dot gnu.org> ---
Fixed for GCC 14 by r14-8196 for PR112588.