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SubjectRe: [PATCH v3 10/30] perf clang: Add builtin clang support ant test case
On Fri, Dec 02, 2016 at 01:44:40PM -0200, Arnaldo Carvalho de Melo wrote:
> Em Sat, Nov 26, 2016 at 07:03:34AM +0000, Wang Nan escreveu:
> > Add basic clang support in clang.cpp and test__clang() testcase. The
> > first testcase checks if builtin clang is able to generate LLVM IR.
> >
> > tests/clang.c is a proxy. Real testcase resides in
> > utils/c++/clang-test.cpp in c++ and exports C interface to perf test
> > subsystem.
> >
> > Test result:
> >
> > $ perf test -v clang
> > 51: Test builtin clang support :
> > 51.1: Test builtin clang compile C source to IR :
> > --- start ---
> > test child forked, pid 13215
> > test child finished with 0
> > ---- end ----
> > Test builtin clang support subtest 0: Ok
>
> While testing this I noticed that the perf binary got huge, can't this
> be done in some other way, i.e. using dynamic library?
>
> [root@jouet ~]# size /tmp/perf
> text data bss dec hex filename
> 75333688 1421584 23962176 100717448 600d388 /tmp/perf
> [root@jouet ~]#
>
> I've built it with this:
>
> make LIBCLANGLLVM=1 O=/tmp/build/perf -C tools/perf install-bin
>
> the resulting binary:
>
> [acme@jouet linux]$
> [acme@jouet linux]$ ls -la ~/bin/perf
> -rwxr-xr-x. 2 acme acme 131689136 Dec 2 12:31 /home/acme/bin/perf
> [acme@jouet linux]$ ls -lah ~/bin/perf
> -rwxr-xr-x. 2 acme acme 126M Dec 2 12:31 /home/acme/bin/perf
> [acme@jouet linux]$
>
> Huge, after stripping it:
>
> [acme@jouet linux]$ ls -la /tmp/perf
> -rwxr-xr-x. 1 root root 76759056 Dec 2 12:33 /tmp/perf
> [acme@jouet linux]$ ls -lah /tmp/perf
> -rwxr-xr-x. 1 root root 74M Dec 2 12:33 /tmp/perf
> [acme@jouet linux]$
>
> Still huge :-\

yeah. it's kinda high. I'm guessing rpm llvm libs are in debug mode.
Try llvm-config --build-mode --assertion-mode
it should be Release OFF

> But being a n00b on llvm/clang libraries, etc, my question goes back to:
> can we have this using a libllvm.so or libclang.so dynamic libraries?

that can also work. The reason we build iovisor/bcc into single binary
is to ease operational headache.

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