Em Wed, Oct 09, 2013 at 09:01:49AM +0200, Ingo Molnar escreveu:
> Arnaldo,
>
> Please pull the tools/perf/build git tree from:
>
> git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git
> tmp.tools/perf/build
>
> # HEAD: 165108a92fc554d51e73b143b69b77e7c278da78 tools/perf/build: Clean
> up feature_print_code()
>
> This tree contains the build system speedup series described at:
>
> https://lkml.org/lkml/2013/10/7/199
>
> Reviewed by David Ahern and Jiri Olsa (thanks guys!).
One problem I just noticed, and that is not preventing me from merging
this now, as it has a (obvious) workaround:
If I try using O= I better make sure the directory it points to exists:
[acme@sandy linux]$ ls -la tools/perf/*.o tools/perf/util/*.o
ls: cannot access tools/perf/*.o: No such file or directory
ls: cannot access tools/perf/util/*.o: No such file or directory
[acme@sandy linux]$ mkdir -p /tmp/build/perf/
[acme@sandy linux]$ time make O=/tmp/build/perf -C tools/perf/ install-bin
make: Entering directory `/home/acme/git/linux/tools/perf'
BUILD: Doing 'make -j8' parallel build
Auto-detecting system features:
... backtrace: [ on ]
... dwarf: [ on ]
<SNIP>
make: Leaving directory `/home/acme/git/linux/tools/perf'
real 0m2.751s
user 0m4.270s
sys 0m1.240s
[acme@sandy linux]$ ls -la tools/perf/*.o tools/perf/util/*.o
ls: cannot access tools/perf/*.o: No such file or directory
ls: cannot access tools/perf/util/*.o: No such file or directory
[acme@sandy linux]$ ls -la /tmp/build/perf/perf
-rwxrwxr-x. 1 acme acme 9791281 Oct 9 11:32 /tmp/build/perf/perf
[acme@sandy linux]$
---------------------------------------------------------------------------------
Works as expected, but if I do:
[acme@sandy linux]$ rm -rf /tmp/build
[acme@sandy linux]$ time make O=/tmp/build/perf -C tools/perf/ install-bin
make: Entering directory `/home/acme/git/linux/tools/perf'
BUILD: Doing 'make -j8' parallel build
Auto-detecting system features:
... backtrace: [ on ]
<SNIP>
make: Leaving directory `/home/acme/git/linux/tools/perf'
real 0m2.715s
user 0m4.118s
sys 0m1.204s
[acme@sandy linux]$ ls -la tools/perf/*.o tools/perf/util/*.o | wc -l
94
[acme@sandy linux]$ ls -la /tmp/build
ls: cannot access /tmp/build: No such file or directory
[acme@sandy linux]$
---------------------------------------------------------------------------------
It silently ignores the O= target, as it doesn't exists.
Previous, expected behaviour is for the build process to stop, complaining that
the
target directory doesn't exists.
- Arnaldo
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