ICE when compiling with -fopenmp and Catch2 unit test suite

[ldalessa]

Bugzilla Link	42586
Resolution	INVALID
Resolved on	Jul 14, 2019 11:13
Version	unspecified
OS	All
Blocks	#41819
Attachments	reduced test case, preprocessed source
CC	@ldalessa,@zygoloid

Extended Description

Lukes-MacBook:test ldalessa$ clang++ --version
Apple LLVM version 10.0.1 (clang-1001.0.46.4)
Target: x86_64-apple-darwin18.6.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
Lukes-MacBook:test ldalessa$ clang++ --version
Apple LLVM version 10.0.1 (clang-1001.0.46.4)
Target: x86_64-apple-darwin18.6.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
Lukes-MacBook:test ldalessa$ cat test.cpp
#include <catch.hpp>

TEST_CASE ("Test", "") {
auto t0 = std::make_tuple();
REQUIRE (std::tuple_size_v<decltype(t0)> == 0);
}
Lukes-MacBook:test ldalessa$ clang++ -Xclang -fopenmp -std=c++17 -save-temps -o test.o -c test.cpp
clang: error: unable to execute command: Illegal instruction: 4
clang: error: clang frontend command failed due to signal (use -v to see invocation)
Apple LLVM version 10.0.1 (clang-1001.0.46.4)
Target: x86_64-apple-darwin18.6.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
clang: note: diagnostic msg: PLEASE submit a bug report to http://developer.apple.com/bugreporter/ 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: /var/folders/nm/j3bknc2n2t7f8llmt1m8j4680000gn/T/test-36c4ea.cpp
clang: note: diagnostic msg: /var/folders/nm/j3bknc2n2t7f8llmt1m8j4680000gn/T/test-36c4ea.sh
clang: note: diagnostic msg: Crash backtrace is located in
clang: note: diagnostic msg: /Users/ldalessa/Library/Logs/DiagnosticReports/clang__.crash
clang: note: diagnostic msg: (choose the .crash file that corresponds to your crash)
clang: note: diagnostic msg:

---

[ldalessa]

Note failure requires both C++17 and OpenMP ("-Xclang -fopenmp -std=c++17" on my macbook).

[ldalessa]

The catch2 unit test suite header
I added the catch header that was used to generate the preprocessed source. It's the single header version from https://github.com/catchorg/Catch2/releases/download/v2.9.1/catch.hpp.

I have no idea what the REQUIRE macro is doing that causes this issue (I can't even begin to imagine how to reduce that part of my test).

[ldalessa]

Finally got access to my linux box back, and this seems to be an Apple-specific issue. I'll try and figure out how to use their bug reporting infrastructure.