Bug #17854
Updated by meta@vmeta.jp (Koichiro Iwao) almost 3 years ago
## Affected version
* Ruby 2.6, 2.7, 3.0 compiled with **clang on FressBD**
No tested with other versions. Ruby compiled with GCC doesn't have this issue.
## Snippet to reproduce
```
ruby -e 'case 1; when 2r; 3; end'
```
## Step to reproduce
Prepare a fresh installation of FreeBSD 13. Either Ruby installed from system package or ruby-build can reproduce the issue.
```
# clang -v
FreeBSD clang version 11.0.1 (git@github.com:llvm/llvm-project.git llvmorg-11.0.1-0-g43ff75f2c3fe)
Target: x86_64-unknown-freebsd13.0
Thread model: posix
InstalledDir: /usr/bin
[root@ruby-bug /tmp]# clang -v
FreeBSD clang version 11.0.1 (git@github.com:llvm/llvm-project.git llvmorg-11.0.1-0-g43ff75f2c3fe)
Target: x86_64-unknown-freebsd13.0
Thread model: posix
InstalledDir: /usr/bin
```
### System Ruby
```
# pkg install ruby
# /usr/local/bin/ruby -v
# /usr/local/bin/ruby -e 'case 1; when 2r; 3; end'
```
### Ruby installed by ruby-build
Same as Ruby installed by ruby-build.
```
# pkg install rbenv ruby-build
# bash
bash# eval "$(rbenv init -)"
bash# cd /tmp
bash# rbenv install 2.7.3
bash# rbenv local 2.7.3
bash# rbenv which ruby
/root/.rbenv/versions/2.7.3/bin/ruby
bash# ruby -e 'case 1; when 2r; 3; end'
```
## Patch
The following patch is provided by the original reporter but it looks too ad-hoc. If this bug is fixed in Ruby upstream, I'll apply it to FreeBSD package.
```diff
diff --git a/compile.c b/compile.c
index 1cabb8c..a954176 100644
--- a/compile.c
+++ b/compile.c
@@ -1987,7 +1987,7 @@ cdhash_cmp(VALUE val, VALUE lit)
return rb_float_cmp(lit, val);
}
else {
- UNREACHABLE_RETURN(-1);
+ return -1;
}
}
@@ -2005,7 +2005,7 @@ cdhash_hash(VALUE a)
case T_FLOAT:
return rb_dbl_long_hash(RFLOAT_VALUE(a));
default:
- UNREACHABLE_RETURN(0);
+ return 0;
}
}
```
## See also
Downstream bug:
* https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255583