Date: Sun, 27 Jul 2014 14:39:27 -0500 From: Stacey Son <sson@FreeBSD.org> To: David Chisnall <theraven@FreeBSD.org> Cc: freebsd-mips@FreeBSD.org Subject: Re: mips64 ld GOT problem Message-ID: <37D1F27C-B595-43AA-A0F8-6B48AE4D7C69@FreeBSD.org> In-Reply-To: <2021F70B-2AA4-412C-8D1B-A8D38A3E031C@FreeBSD.org> References: <77F1DDA2-A4E5-4D64-AA43-F8CBC55249C4@me.com> <48935A3D-0387-42F1-ACF0-14EB7D8F9A06@bsdimp.com> <C7869A0A-8CE6-4764-9AFD-A49C93E680C1@FreeBSD.org> <2021F70B-2AA4-412C-8D1B-A8D38A3E031C@FreeBSD.org>
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Hi David: Compiling with the cmake option "-DBUILD_SHARED_LIBS=3DTrue" does get it = pass linking 'opt' but it later fails later on... [ 73%] Building CXX object = tools/clang/lib/AST/CMakeFiles/clangAST.dir/VTTBuilder.cpp.o Linking CXX shared library ../../../../lib/libclangAST.so [...] /home/sson/llvm/tools/clang/lib/AST/ASTContext.cpp:(.text+0x710): = relocation truncated to fit: R_MIPS_CALL16 against `bool = llvm::isa<clang::ObjCPropertyDecl, clang::Decl const*>(clang::Decl = const* const&)' [...] /home/sson/llvm/tools/clang/lib/AST/ASTContext.cpp:(.text+0x5a98): = additional relocation overflows omitted from the output clang-3.5: error: linker command failed with exit code 1 (use -v to see = invocation) *** Error code 1 As for enabling optimization, when I use "-DCMAKE_BUILD_TYPE=3DRelease" = or "-DCMAKE_BUILD_TYPE=3DMinSizeRel" with the cmake I get an = "EmitRawText called on an MCStreamer that doesn't support it, something = must not be fully mc'ized" abort. Only "-DCMAKE_BUILD_TYPE=3DDebug" or = "-DCMAKE_BUILD_TYPE=3DNone" seems to work. Maybe I am not enabling the = optimization correctly? I have been able to get ld from binutils 2.24 to mostly work. It will = link binaries with "-static" but dynamic binaries are still a problem. = It seems the default ldscript is not quite right or something. -stacey. On Jul 26, 2014, at 6:46 AM, David Chisnall <theraven@FreeBSD.org> = wrote: > The only way that I've ever got llvm to compile for MIPS has been by = enabling shared libraries, enabling optimisation, and disabling debug = info. This gave each shared lib a small enough GOT for our binutils = linker to work. >=20 > Newer binutils supports multi-GOT (GOT is split and different GOTs are = installed by some calls) and large-GOT (GOT accesses use register = offsets) modes. >=20 > David >=20 > On 25 Jul 2014, at 23:27, Stacey Son <sson@FreeBSD.org> wrote: >=20 >>=20 >> Hi Warner... >>=20 >> On Jul 25, 2014, at 11:26 AM, Warner Losh <imp@bsdimp.com> wrote: >>=20 >>>=20 >>> On Jul 25, 2014, at 9:24 AM, Stacey Son <sson@me.com> wrote: >>>=20 >>>> Hi all: >>>>=20 >>>> I have been trying to bootstrap clang/llvm 3.5 for mips64 (i.e. = cross build clang/llvm 3.5 for mips64 using clang/llvm 3.5) but run into = the following linker problem (see below) in about the midway point as it = is trying to link 'opt'. The assertions that fail are the following: >>>>=20 >>>> BFD 2.17.50 [FreeBSD] 2007-07-03 assertion fail = /usr/home/sson/freebsd/gnu/usr.bin/binutils/libbfd/../../../../contrib/bin= utils/bfd/elfxx-mips.c:7455 >>>>=20 >>>> BFD_ASSERT (g->assigned_gotno - g->local_gotno >>>> <=3D g->global_gotno); >>>>=20 >>>> BFD 2.17.50 [FreeBSD] 2007-07-03 assertion fail = /usr/home/sson/freebsd/gnu/usr.bin/binutils/libbfd/../../../../contrib/bin= utils/bfd/elfxx-mips.c:2767 >>>>=20 >>>> /* There should have been enough room in the symbol table to >>>> accommodate both the GOT and non-GOT symbols. */ >>>> BFD_ASSERT (hsd.max_non_got_dynindx <=3D hsd.min_got_dynindx); >>>>=20 >>>> BFD 2.17.50 [FreeBSD] 2007-07-03 assertion fail = /usr/home/sson/freebsd/gnu/usr.bin/binutils/libbfd/../../../../contrib/bin= utils/bfd/elfxx-mips.c:10282 >>>>=20 >>>> /* Make sure we didn't grow the global .got region. */ >>>> dynobj =3D elf_hash_table (info)->dynobj; >>>> got =3D mips_elf_got_section (dynobj, FALSE); >>>> g =3D mips_elf_section_data (got)->u.got_info; >>>>=20 >>>> if (g->global_gotsym !=3D NULL) >>>> BFD_ASSERT ((elf_hash_table (info)->dynsymcount >>>> - g->global_gotsym->dynindx) >>>> <=3D g->global_gotno); >>>>=20 >>>> Does anyone have an idea for a work around or fix? >>>=20 >>> Silly question: does using the latest binutils fix this problem? >>=20 >> Is there a stable port of the latest binutils to mips? Does someone = have some patches? I did tried TheRaven's port of the 2.18 binutils but = it seemed that 'ld' wasn't very happy. It didn't like any of the object = files I offered it. >>=20 >>> Failing that, perhaps we need to specify a larger GOT region that we = do today? IIRC, that=92s specified with -g on the linker line, Try = adding =93-G0=94. I have a vague recollection we always used to do this, = but moved it to be a default (or maybe other systems have the default = and we still need to add it). It doesn=92t look like it is being added = from the output that you=92ve posted. IIRC, it has to be specified on = all the compiler invocations as well. >>=20 >> Reading the man page implies -Gvalue/--gpsize=3Dvalue is only for = ECOFF binaries. I tried it anyway and it didn't seem to help. >>=20 >> -stacey. >=20
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