[Bug 221588] clang crashes when compiling cad/openvsp

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221588

            Bug ID: 221588
           Summary: clang crashes when compiling cad/openvsp
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: fernando.apesteguia at gmail.com

Created attachment 185523
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=185523&action=edit
clang crash debug file

One of my ports (cad/openvsp) fails to compile in -CURRENT. The port
only compiles with gcc on < 12. As part of the debugging I changed to
compile with clang.

The compiler crashed while compiling the port with the following error:

fatal error: error in backend: No open frame
c++: error: clang frontend command failed with exit code 70

Compiler version is:

freebsd clang version 5.0.0 (brances/release_50 309439)

FreeBSD CURRENT is running in virtualbox 5.1.22 with 8GB of memory assigned. I
didn't see any symptoms of memory exhaustion.

How to reproduce:

Change compiler:gcc-c++11-lib to compiler:c++14-lang in port's Makefile

Change src/external/glfont2/CMakeLists.txt and add /usr/local/include
(for some reason clang doesn't find GL/gl.h while gcc does...)

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