Bug #15548: Fix MJIT on OpenBSD when GCC is used to compile

• Status: Closed
• 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: DONE

[jeremyevans0 (Jeremy Evans)]

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.

[k0kubun (Takashi Kokubun)]

• Status changed from Open to Closed

Applied in changeset trunk|r66869.

---

mjit_worker.c: do not use GCC_NOSTDLIB_FLAGS for OpenBSD

OpenBSD's GCC compiler has local extensions that break when
-nostartfiles -nodefaultlibs -nostdlib is used.

From: Jeremy Evans [e-mail]

[Bug #15548]

[k0kubun (Takashi Kokubun)]

Applied your patch. Thanks for your help!

[naruse (Yui NARUSE)]

• Backport changed from 2.4: DONTNEED, 2.5: DONTNEED, 2.6: REQUIRED to 2.4: DONTNEED, 2.5: DONTNEED, 2.6: DONE

ruby_2_6 r66924 merged revision(s) 66823,66869.