[Haskell-cafe] GHC 8.2.1 + lld on FreeBSD

[Gleb Popov]

On Tue, Aug 15, 2017 at 5:25 AM, Sumit Raja <sumitraja at gmail.com> wrote:

> Hi,
>
> I've been playing with ghc 8.2.1 and clang + lld on FreeBSD 11. I
> wasn't able to get the installation as per release notes to select lld
> instead of gold (will spend more time exploring why when I get a
> chance) so I modified the settings file after install. I have builds
> running okay but I keep seeing the following:
>
> [1 of 1] Compiling Main             ( hs.hs, hs.o )
> Linking hs ...
>
> <no location info>: error:
>     Warning: Couldn't figure out linker information!
>              Make sure you're using GNU ld, GNU gold or the built in
> OS X linker, etc.
>
> I've set up ld.lld39 as the shipped lld  is 4.0. Although not
> affecting the actual build ("Hello World") but was interested to know
> why this was happening. Settings file is below:
>
> [("GCC extra via C opts", " -fwrapv -fno-builtin"),
>  ("C compiler command", "clang"),
>  ("C compiler flags", " -fno-stack-protector"),
>  ("C compiler link flags", "-L/usr/local/lib -fuse-ld=lld39"),
>  ("C compiler supports -no-pie", "NO"),
>  ("Haskell CPP command","clang"),
>  ("Haskell CPP flags","-E -undef -traditional"),
>  ("ld command", "ld.lld"),
>  ("ld flags", "-L/usr/local/lib"),
>  ("ld supports compact unwind", "YES"),
>  ("ld supports build-id", "YES"),
>  ("ld supports filelist", "NO"),
>  ("ld is GNU ld", "YES"),
>  ("ar command", "/usr/bin/ar"),
>  ("ar flags", "clqs"),
>  ("ar supports at file", "NO"),
>  ("touch command", "touch"),
>  ("dllwrap command", "/bin/false"),
>  ("windres command", "/bin/false"),
>  ("libtool command", "libtool"),
>  ("perl command", "/usr/local/bin/perl"),
>  ("cross compiling", "NO"),
>  ("target os", "OSFreeBSD"),
>  ("target arch", "ArchX86_64"),
>  ("target word size", "8"),
>  ("target has GNU nonexec stack", "True"),
>  ("target has .ident directive", "True"),
>  ("target has subsections via symbols", "False"),
>  ("target has RTS linker", "@HaskellHaveRTSLinker@"),
>  ("Unregisterised", "NO"),
>  ("LLVM llc command", "llc39"),
>  ("LLVM opt command", "opt39")
>  ]
>
>
> Thanks
>
> Sumit
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On a quest for building GHC with clang, I've fixed almost identical
warning, see https://phabricator.haskell.org/D3840
There should be a similar case expression for a linker tool too, I presume.
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