[swift-dev] Build Error: Relocation R_X86_64_PC32

[Dmitri Gribenko]

On Mon, Mar 14, 2016 at 3:38 PM, Ryan Lovelett
<swift-dev at ryan.lovelett.me> wrote:
> On Tue, Mar 1, 2016, at 12:16 AM, Dmitri Gribenko wrote:
>> IIRC there is no issue in the bug tracker, please feel free to file one!
>>
>> Also, if you are familiar with binutils internals, it might be helpful
>> to bisect the linker.
>
> I'm finally getting around to bisecting binutils. I'm making some
> progress but I'm getting hung up on one thing. The build script keeps
> finding the "regular" linker at `/usr/bin/ld` instead of mine
> `/tmp/binutils/2.25/usr/local/bin/ld`.
>
> I tried to update the PATH environment variable such that mine is before
> `/usr/bin` but that doesn't seem to work. Is there an argument to send
> that can force mine?

I'm afraid '/usr/bin/ld' is hardcoded in clang.  A few days ago Clang
added a command-line option to override that:

commit 635bc7fefc12cc1333ba6ec77e563b7c8af01265
Author: Peter Zotov <whitequark at whitequark.org>
Date:   Wed Mar 9 05:18:16 2016 +0000

    Accept absolute paths in the -fuse-ld option.

    This patch extends the -fuse-ld option to accept a full path to an
executable
    and use it verbatim to invoke the linker. There are generally two reasons
    to desire this.

    The first reason relates to the sad truth is that Clang is retargetable,
    Binutils are not.

    While any Clang from a binary distribution is sufficient to compile code
    for a wide range of architectures and prefixed BFD linkers (e.g.
    installed as /usr/bin/arm-none-linux-gnueabi-ld) as well as cross-compiled
    libc's (for non-bare-metal targets) are widely available, including on all
    Debian derivatives, it is impossible to use them together because
    the -fuse-ld= option allows to specify neither a linker prefix nor
    a full path to one.

    The second reason is linker development, both when porting existing linkers
    to new architectures and when working on a new linker such as LLD.

    Differential Revision: http://reviews.llvm.org/D17952

    git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@262996
91177308-0d34-0410-b5e6-96231b3b80d8

Dmitri

-- 
main(i,j){for(i=2;;i++){for(j=2;j<i;j++){if(!(i%j)){j=0;break;}}if
(j){printf("%d\n",i);}}} /*Dmitri Gribenko <gribozavr at gmail.com>*/