linux-kernel - Re: [GIT PULL] tools/perf/build: Speed up the perf build system

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Date:	Wed, 9 Oct 2013 16:16:26 -0300
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	David Ahern <dsahern@...il.com>, Jiri Olsa <jolsa@...hat.com>,
	Namhyung Kim <namhyung@...nel.org>
Subject: Re: [GIT PULL] tools/perf/build: Speed up the perf build system

So while merging what I have in my perf/core branch I got to Vitillo's, as
peterz called it, "inlining" of addr2line, i.e. using libbfd to do that work,
it will look if lbfd is in EXTLIBS and if so, use it, otherwise we continue
exec'in the addr2line tool.

Since this appears when doing the feature check:

...                        libbfd: [ on  ]

I wanted to build just one object file that is related to this:

[acme@...dy linux]$ ls -la /tmp/build/perf/util/util/srcline.o
ls: cannot access /tmp/build/perf/util/util/srcline.o: No such file or directory
[acme@...dy linux]$ ls -la tools/perf/util/srcline.c 
-rw-rw-r--. 1 acme acme 1777 Oct  9 16:06 tools/perf/util/srcline.c
[acme@...dy linux]$ ls -la tools/perf/util/srcline.*
-rw-rw-r--. 1 acme acme 1777 Oct  9 16:06 tools/perf/util/srcline.c
[acme@...dy linux]$ make V=1 O=/tmp/build/perf -C tools/perf/ util/srcline.o
make: Entering directory `/home/acme/git/linux/tools/perf'
    BUILD: Doing 'make -j8' parallel build
    # Redirected target util/srcline.o => /tmp/build/perf/util/util/srcline.o
make: Leaving directory `/home/acme/git/linux/tools/perf'
[acme@...dy linux]$ 
[acme@...dy linux]$ ls -la /tmp/build/perf/util/util/srcline.o
ls: cannot access /tmp/build/perf/util/util/srcline.o: No such file or directory
[acme@...dy linux]$ make V=1 O=/tmp/build/perf -C tools/perf/ /tmp/build/perf/util/util/srcline.o
make: Entering directory `/home/acme/git/linux/tools/perf'
    BUILD: Doing 'make -j8' parallel build
make[1]: *** No rule to make target `/tmp/build/perf/util/util/srcline.o'.  Stop.
make: *** [/tmp/build/perf/util/util/srcline.o] Error 2
make: Leaving directory `/home/acme/git/linux/tools/perf'
[acme@...dy linux]$ ls -la tools/perf/util/srcline.*
-rw-rw-r--. 1 acme acme 1777 Oct  9 16:06 tools/perf/util/srcline.c
[acme@...dy linux]$

	What am I doing wrong here while trying to build just one .o file?

	Back to checking why it is not using the 'inline' addr2line...

- Arnaldo
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