[Bug 240342] clang++ bus error while building LLVM as part of Julia

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240342

            Bug ID: 240342
           Summary: clang++ bus error while building LLVM as part of Julia
           Product: Base System
           Version: 11.3-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: alex.arslan at julialang.org

I routinely build Julia (https://julialang.org) from source on FreeBSD using
```
gmake -j4 USECCACHE=1 USE_BINARYBUILDER=0
```
The `USE_BINARYBUILDER=0` option simply tells the build system to download and
compile the dependencies from source rather than downloading prebuilt,
cross-compiled binaries for the dependencies. Without this option, LLVM is not
built from source.

Today, doing `git clean -fdx` and rebuilding with the above command proceeded
as usual for a while but then failed with the following while compiling LLVM:

```
Scanning dependencies of target LLVMCoverage
[ 61%] Building CXX object
lib/ProfileData/Coverage/CMakeFiles/LLVMCoverage.dir/CoverageMapping.cpp.o
In file included from
/usr/home/alex/Projects/julia/deps/srccache/llvm-6.0.1/lib/ProfileData/Coverage/CoverageMapping.cpp:15:
/usr/home/alex/Projects/julia/deps/srccache/llvm-6.0.1/include/llvm/ProfileData/Coverage/CoverageMapping.h:643:25:
warning: explicitly defaulted copy assignment operator is implicitly deleted
[-Wdefaulted-function-deleted]
  LineCoverageIterator &operator=(const LineCoverageIterator &R) = default;
                        ^
/usr/home/alex/Projects/julia/deps/srccache/llvm-6.0.1/include/llvm/ProfileData/Coverage/CoverageMapping.h:663:23:
note: copy assignment operator of 'LineCoverageIterator' is implicitly deleted
because field 'CD' is of reference type 'const llvm::coverage::CoverageData &'
  const CoverageData &CD;
                      ^
clang++: error: unable to execute command: Bus error (core dumped)
clang++: error: clang frontend command failed due to signal (use -v to see
invocation)
FreeBSD clang version 8.0.0 (tags/RELEASE_800/final 356365) (based on LLVM
8.0.0)
Target: x86_64-unknown-freebsd11.3
Thread model: posix
InstalledDir: /usr/bin
clang++: note: diagnostic msg: PLEASE submit a bug report to
https://bugs.freebsd.org/submit/ and include the crash backtrace, preprocessed
source, and associated run script.
clang++: note: diagnostic msg: 
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang++: note: diagnostic msg: /tmp/CoverageMapping-01cfc3.cpp
clang++: note: diagnostic msg: /tmp/CoverageMapping-01cfc3.sh
clang++: note: diagnostic msg: 

********************
[ 61%] Building CXX object
lib/Analysis/CMakeFiles/LLVMAnalysis.dir/PtrUseVisitor.cpp.o
gmake[4]: ***
[lib/ProfileData/Coverage/CMakeFiles/LLVMCoverage.dir/build.make:63:
lib/ProfileData/Coverage/CMakeFiles/LLVMCoverage.dir/CoverageMapping.cpp.o]
Error 254
gmake[3]: *** [CMakeFiles/Makefile2:9480:
lib/ProfileData/Coverage/CMakeFiles/LLVMCoverage.dir/all] Error 2
```

The requested attachments are at
https://gist.github.com/ararslan/ee6b157f8868a45ad865cfa9b3756f35

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