Build failure on MacOS

[antumbde]

MacOS build is failing with an error given below.
I'm building HEAD
Mac OS version: 12.0.1

The error seems to be from protobuf build. There was similar issue for protobuf that seems fixed https://github.com/protocolbuffers/upb/issues/212
Building protobuf HEAD worked. So, I'm not sure what exactly is causing the issue. Protobuf build had updated some system component (forgot to note that).

2 warnings generated.
ERROR: /private/var/tmp/_bazel_adwait/be039efe658ce51b20609226fd8df80b/external/upb/BUILD:58:1: C++ compilation of rule '@upb//:upb' failed (Exit 1) wrapped_clang failed: error executing command external/local_config_cc/wrapped_clang '-D_FORTIFY_SOURCE=1' -fstack-protector -fcolor-diagnostics -Wall -Wthread-safety -Wself-assign -fno-omit-frame-pointer -O0 -DDEBUG -iquote external/upb -iquote ... (remaining 24 argument(s) skipped)

Use --sandbox_debug to see verbose messages from the sandbox
In file included from external/upb/upb/decode.c:3:
external/upb/upb/upb.h:39:3: error: '_Bool' is a C99 extension [-Werror,-Wc99-extensions]
bool ok;
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/13.0.0/include/stdbool.h:15:14: note: expanded from macro 'bool'
#define bool _Bool
^
In file included from external/upb/upb/decode.c:3:
external/upb/upb/upb.h:48:1: error: '_Bool' is a C99 extension [-Werror,-Wc99-extensions]
bool upb_ok(const upb_status *status);

........

external/upb/upb/decode.c:273:8: error: '_Bool' is a C99 extension [-Werror,-Wc99-extensions]
static bool upb_decode_addval(upb_decframe *frame,
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/13.0.0/include/stdbool.h:15:14: note: expanded from macro 'bool'
#define bool _Bool
^
fatal error: too many errors emitted, stopping now [-ferror-limit=]
20 errors generated.
INFO: Elapsed time: 337.285s, Critical Path: 250.75s
INFO: 1453 processes: 1405 darwin-sandbox, 48 worker.
FAILED: Build did NOT complete successfully

[matthewcbrown]

I think I have this fixed, but please give it a try with the latest commit (I have pretty limited access to mac dev environments for testing)

[Matts966]

@matthewcbrown
Thank you!
I found that build succeeded even on M1 mac, but I had to set .bazelversion to 4.1.0.