linux-kernel - Re: [PATCH v3 10/30] perf clang: Add builtin clang support ant test case

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Date:   Tue, 17 Jan 2017 16:04:32 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     "Wangnan (F)" <wangnan0@...wei.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Alexei Starovoitov <ast@...com>, Zefan Li <lizefan@...wei.com>,
        He Kuang <hekuang@...wei.com>, Ingo Molnar <mingo@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        pi3orama <pi3orama@....com>, Joe Stringer <joe@....org>,
        Jiri Olsa <jolsa@...nel.org>
Subject: Re: [PATCH v3 10/30] perf clang: Add builtin clang support ant test
 case

Em Tue, Jan 17, 2017 at 10:27:39AM -0800, Alexei Starovoitov escreveu:
> On Tue, Jan 17, 2017 at 5:38 AM, Arnaldo Carvalho de Melo
> <acme@...nel.org> wrote:
> > [acme@...et linux]$ ls -lah /tmp/perf
> > -rwxr-xr-x. 1 acme acme 4.4M Jan 17 10:29 /tmp/perf
> > [acme@...et linux]$ size /tmp/perf
> >    text    data     bss     dec     hex filename
> > 3954488  622440 23912104        28489032        1b2b548 /tmp/perf
> > [acme@...et linux]$ ldd /tmp/perf | egrep -i llvm\|clang
> >         libclangAST.so.40 => /usr/local/lib/libclangAST.so.40 (0x00007f4964981000)
> ...
> >         libLLVMSystemZDisassembler.so.40 => /usr/local/lib/libLLVMSystemZDisassembler.so.40 (0x00007f495fe70000)
> ...
> >         libLLVMSparcDisassembler.so.40 => /usr/local/lib/libLLVMSparcDisassembler.so.40 (0x00007f495f14f000)
> ...
> >         libLLVMPowerPCDisassembler.so.40 => /usr/local/lib/libLLVMPowerPCDisassembler.so.40 (0x00007f495de94000)
> ...
> >         libLLVMMSP430CodeGen.so.40 => /usr/local/lib/libLLVMMSP430CodeGen.so.40 (0x00007f495c79d000)
> ...
> >         libLLVMMipsDisassembler.so.40 => /usr/local/lib/libLLVMMipsDisassembler.so.40 (0x00007f495bf73000)
 
> I think the static binary shouldn't be including all llvm backends.
> It's not clear to me why .so pulls them all.
> fyi I typically configure llvm with:
> -DLLVM_TARGETS_TO_BUILD="X86;BPF"

Humm, so this is a limitation of the LLVM libraries? I.e. people linking
against it should ask for a subset of backends so that would be dlopened
out of a larger set builtin, say, in a generic distro shipped llvm/clang
package?

- Arnaldo