[Bug 275168] devel/cmake-core: segfault on checking MPI implementation when GCC is used as the compiler

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=275168

            Bug ID: 275168
           Summary: devel/cmake-core: segfault on checking MPI
                    implementation when GCC is used as the compiler
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: kde@FreeBSD.org
          Reporter: vedran@miletic.net
          Assignee: kde@FreeBSD.org
             Flags: maintainer-feedback?(kde@FreeBSD.org)

Created attachment 246388
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=246388&action=edit
CMake core dump

I am using 14.0-RELEASE FreeBSD 14.0-RELEASE #0
releng/14.0-n265380-f9716eee8ab4: Fri Nov 10 05:57:23 UTC 2023    
root@releng1.nyi.freebsd.org:/usr/obj/usr/src/amd64.amd64/sys/GENERICamd64
1400097 1400097, but this issue also affected BETAs, RCs and IIRC 13.2-RELEASE.

I am configuring GROMACS 2023.3 from [1] with CMake 3.26.1_3, compiler set to
GCC 12.2.0_6 and OpenMPI 4.1.5_1 present on the system, using the command:

% cmake -D CMAKE_C_COMPILER=gcc12 -D CMAKE_CXX_COMPILER=g++12 -S . -B build

This will cause CMake to dump core. I verified that this does not happen when
GCC is replaced with Clang (from the base system) or when OpenMPI is replaced
MPICH 3.4.3_2.

While I believe this is an issue with CMake, I found out that it did not happen
in GROMACS 2021 so I bisected the issue one the GROMACS side. The offending
commit [2] could be helpful to minimize the example CMakeLists.txt if that
becomes necessary.

Finally, I wondered if this is an issue with CMake or an issue with the build
of CMake from Ports. I uninstalled CMake via pkg and used (via Linuxilator) the
official Linux amd64 binary at the exact same version, downloaded from [3].
There is no core dump.

Hope this helps. Let me know if I can provide more info.

[1] https://manual.gromacs.org/2023.3/download.html
[2]
https://gitlab.com/gromacs/gromacs/-/commit/9088f06a56c6122f21a47e3f06509ce1737465ef
[3]
https://github.com/Kitware/CMake/releases/download/v3.26.1/cmake-3.26.1-linux-x86_64.tar.gz

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