libevent: [warn] kq_init: detected broken kqueue; not using.: Undefined error: 0

[deepj]

I'm getting this warning on macOS Sierra PB1 when I run crystal compiler. It probably prevents to run a simple Kemal app (it's web framework written in Crystal language). Apparently the problem lies in libevent. Tthe library would belong to #1957 list.

It seems the fix is the following https://codereview.chromium.org/2134603002/diff/20001/base/third_party/libevent/kqueue.c (according to a guy from Crystal IRC).

[DomT4]

Refs:

• libevent erroneously detects kqueue bug on macOS 10.12 libevent/libevent#376
• https://bugs.chromium.org/p/chromium/issues/detail?id=626534

I'd be fine with us adopting the patch proposed in libevent/libevent#377, but it may be reasonable to wait on some upstream feedback to the PR there given upstream is fairly active.

Still no change, even brew install libevent --HEAD doesn't fix the issue.

Have to continue using my Linux machine to stay with Crystal; a fantastic Ruby alternative.

[DomT4]

Yeah, I can reproduce. The upstream fix doesn't seem completely sufficient, at least for crystal-lang.

It makes a significant difference though, at least on the surface. I don't know enough about crystal-lang to poke around deeper:

~> brew install libevent --HEAD && brew install crystal-lang -v

==> make crystal release=true
clang++ -c -o src/llvm/ext/llvm_ext.o src/llvm/ext/llvm_ext.cc `/usr/local/opt/llvm/bin/llvm-config --cxxflags`
clang -fPIC   -c -o src/ext/sigfault.o src/ext/sigfault.c
ar -rcs src/ext/libcrystal.a src/ext/sigfault.o
./bin/crystal build --release  -o .build/crystal src/compiler/crystal.cr -D without_openssl -D without_zlib
[warn] kq_init: detected broken kqueue; not using.: Undefined error: 0
Deprecation: The build command was renamed to compile and will be removed in a future version.
...

==> Summary
🍺  /usr/local/Cellar/crystal-lang/0.18.7: 631 files, 34.3M, built in 4 minutes 49 seconds
$ crystal
Usage: crystal [command] [switches] [program file] [--] [arguments]

Compared to:

~> brew install libevent && brew install crystal-lang -v

==> make crystal release=true
clang++ -c -o src/llvm/ext/llvm_ext.o src/llvm/ext/llvm_ext.cc `/usr/local/opt/llvm/bin/llvm-config --cxxflags`
clang -fPIC   -c -o src/ext/sigfault.o src/ext/sigfault.c
ar -rcs src/ext/libcrystal.a src/ext/sigfault.o
./bin/crystal build --release  -o .build/crystal src/compiler/crystal.cr -D without_openssl -D without_zlib
[warn] kq_init: detected broken kqueue; not using.: Undefined error: 0
Deprecation: The build command was renamed to compile and will be removed in a future version.
[warn] kq_init: detected broken kqueue; not using.: Undefined error: 0
[warn] kq_init: detected broken kqueue; not using.: Undefined error: 0
[warn] kq_init: detected broken kqueue; not using.: Undefined error: 0
[warn] kq_init: detected broken kqueue; not using.: Undefined error: 0
[warn] kq_init: detected broken kqueue; not using.: Undefined error: 0
[warn] kq_init: detected broken kqueue; not using.: Undefined error: 0
[warn] kq_init: detected broken kqueue; not using.: Undefined error: 0
[warn] kq_init: detected broken kqueue; not using.: Undefined error: 0
[warn] kq_init: detected broken kqueue; not using.: Undefined error: 0
[warn] kq_init: detected broken kqueue; not using.: Undefined error: 0
[warn] kq_init: detected broken kqueue; not using.: Undefined error: 0
[warn] kq_init: detected broken kqueue; not using.: Undefined error: 0
[warn] kq_init: detected broken kqueue; not using.: Undefined error: 0
[warn] kq_init: detected broken kqueue; not using.: Undefined error: 0
[warn] kq_init: detected broken kqueue; not using.: Undefined error: 0
[warn] kq_init: detected broken kqueue; not using.: Undefined error: 0
[warn] kq_init: detected broken kqueue; not using.: Undefined error: 0
[warn] kq_init: detected broken kqueue; not using.: Undefined error: 0
[warn] kq_init: detected broken kqueue; not using.: Undefined error: 0
[warn] kq_init: detected broken kqueue; not using.: Undefined error: 0
[warn] kq_init: detected broken kqueue; not using.: Undefined error: 0
...

==> Summary
🍺  /usr/local/Cellar/crystal-lang/0.18.7: 631 files, 34.3M, built in 4 minutes 18 seconds
$ crystal
[warn] kq_init: detected broken kqueue; not using.: Undefined error: 0
Usage: crystal [command] [switches] [program file] [--] [arguments]

It works for me on macOS 10.12 beta3 with Xcode 8 beta3 :-)

Uninstalled libevent, llvm and cleaned up brew.
Run brew update twice and then brew install libevent --HEAD && brew install crystal-lang -v

I also saw this message

==> make crystal release=true
clang++ -c -o src/llvm/ext/llvm_ext.o src/llvm/ext/llvm_ext.cc `/usr/local/opt/llvm/bin/llvm-config --cxxflags`
clang -fPIC   -c -o src/ext/sigfault.o src/ext/sigfault.c
ar -rcs src/ext/libcrystal.a src/ext/sigfault.o
./bin/crystal build --release  -o .build/crystal src/compiler/crystal.cr -D without_openssl -D without_zlib
[warn] kq_init: detected broken kqueue; not using.: Undefined error: 0
Deprecation: The build command was renamed to compile and will be removed in a future version.

But at the end the installation was successful.

==> /private/tmp/crystal-lang-20160727-38564-1a406ho/crystal-0.18.7/bin/crystal build -o /private/tmp/crystal-lang-20160727-38564-1a406ho/crystal-0.18.7/.build/shards src/shards.cr
Using compiled compiler at .build/crystal
==> Cleaning
==> Finishing up
ln -s ../../Cellar/crystal-lang/0.18.7/etc/bash_completion.d/crystal crystal
ln -s ../Cellar/crystal-lang/0.18.7/bin/crystal crystal
ln -s ../Cellar/crystal-lang/0.18.7/bin/shards shards
ln -s ../../../Cellar/crystal-lang/0.18.7/share/zsh/site-functions/crystal crystal
==> Caveats
Bash completion has been installed to:
  /usr/local/etc/bash_completion.d

zsh completion has been installed to:
  /usr/local/share/zsh/site-functions
==> Summary
🍺  /usr/local/Cellar/crystal-lang/0.18.7: 631 files, 34.3M, built in 4 minutes 31 seconds

[DomT4]

I've applied the upstream patch to our libevent formula in stable, so you should be able to brew update & then use a vanilla brew install libevent && brew install crystal-lang -v without issue.

Since we seem to have mostly resolved this specific issue I've added this into our tracking thread @ #1957 & will close here. Please shout if you uncover any deeper errors though, so we can go back upstream to libevent as necessary.

It works! I uninstalled libevent, llvm and crystal-lang then let brew install everything again but without --HEAD. Thanks, man!

[DomT4]

Great! Thanks for the confirmation on your end. Happy to help.