Issue #15548 has been reported by jeremyevans0 (Jeremy Evans).

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Bug #15548: Fix MJIT on OpenBSD when GCC is used to compile
https://bugs.ruby-lang.org/issues/15548

* Author: jeremyevans0 (Jeremy Evans)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.7.0dev (2019-01-19 trunk 66868) [x86_64-openbsd]
* Backport: 2.4: DONTNEED, 2.5: DONTNEED, 2.6: REQUIRED
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OpenBSD's GCC compiler has local extensions that break when `-nostartfiles -nodefaultlibs -nostdlib` is used.  If you leave those flags in, MJIT doesn't work. `--jit-verbose=2` output on OpenBSD/amd64 with gcc forced as the compiler shows:

```
/usr/bin/ld: error: can't create dynamic relocation R_X86_64_PC32 against symbol: __guard_local in readonly segment; recompile object files with -fPIC
>>> defined in /tmp/_ruby_mjit_p43488u28.o
>>> referenced by _ruby_mjit_p43488u28.c
>>>               /tmp/_ruby_mjit_p43488u28.o:(_mjit28)
collect2: ld returned 1 exit status
link_o_to_so: link error: 1
```

or on OpenBSD/powerpc (where GCC is the default system compiler):

```
Starting process: cc cc -shared -Wfatal-errors -fPIC -shared -w -pipe -O3 -o /tmp/_ruby_mjit_p40346u0.so /tmp/_ruby_mjit_p40346u0.o -L/usr/local/lib -nostartfiles -nodefaultlibs -nostdlib                                                                                                                                                                                                           
ruby26:/tmp/_ruby_mjit_p40346u0.so: undefined symbol '__guard_local'                                                                                                                                                
MJIT warning: failure in loading code from '/tmp/_ruby_mjit_p40346u0.so': Cannot load specified object
```

The attached patch fixes the issue.  

---Files--------------------------------
mjit_worker.diff (1.21 KB)


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