Date: Sat, 31 Jan 2015 12:47:26 -0800 From: Sean Bruno <sbruno@ignoranthack.me> To: freebsd-mips@freebsd.org Subject: Migrating mips/mips64 to clang/llvm [update 3, with real bugs] Message-ID: <54CD3F5E.2020204@ignoranthack.me>
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 tl;dr: linking libc fails at the moment if I wave my hands a lot and patch out of dim's clang36 branch Quite a bit of progress today (mainly thanks to Ed mentoring and letting me cut-n-paste some ASM code). We're not linking together libc correctly. So we've got a few things going on: .cprestore unsupported http://llvm.org/bugs/show_bug.cgi?id=20967 -- even with this patch, I need to comment out the warning about PIC. -- Ed confirms that .cprestore is a no-op on mips if PIC isn't enabled. -- This leads us to the following 4 patches that are under review. - http://reviews.llvm.org/D6267 - http://reviews.llvm.org/D5626 - http://reviews.llvm.org/D5601 - http://reviews.llvm.org/D6231 With those in place, and the support for our target triple in clang, I can progress further. We then run into unsupported GAS macros, which are the subject of http://llvm.org/bugs/show_bug.cgi?id=21474 Currently, libc moves to the linking stage and fails: building shared library libc.so.7 /var/tmp/mips.mips/home/sbruno/bsd/clang360-import/tmp/usr/bin/ld: /var/tmp/mips.mips/home/sbruno/bsd/clang360-import/tmp/usr/lib/crtbeginS.o: CALL16 reloc at 0x8 not against global symbol /var/tmp/mips.mips/home/sbruno/bsd/clang360-import/tmp/usr/lib/crtbeginS.o: could not read symbols: Bad value cc: error: linker command failed with exit code 1 (use -v to see invocation) *** Error code 1 sean Unified diff of my current tree based on the projects/clang360 import branch. https://people.freebsd.org/~sbruno/clang_mips.diff -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQF8BAEBCgBmBQJUzT9cXxSAAAAAAC4AKGlzc3Vlci1mcHJAbm90YXRpb25zLm9w ZW5wZ3AuZmlmdGhob3JzZW1hbi5uZXRCQUFENDYzMkU3MTIxREU4RDIwOTk3REQx MjAxRUZDQTFFNzI3RTY0AAoJEBIB78oecn5kFpIH/jqbLuEOV3zmeVC2sUXnBVTD i5Xv/v579EkLvz9KAhPWvbTsQlX9cNYL8sB7gioXkUTrmKYS7Fue3O7KAEe6WpbE B5RLQ+q5GtiM6OS3286zD/ErlZfaSRZtIE5MD8uy0AN1HqpregJhSRXFuc58f4qd 4pk282j33+pjd+r+DrwXBZqiDc5oLlEz5NGm47WUevXMjHEO3S7PYQ52YJmYZYj2 2+phO1NfwJG3PcXCuVdNIOk1pg1QbyW78JVDDjEQomRdvZzTCoCTNPAO7kQss3gB l0Iklu8DDj6KPPDdpW4DaxC9AWJAi1Jl/+3AvTHoM99r8lrP/jKO+lVk09Ukuus= =auQq -----END PGP SIGNATURE-----
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