Messages in this thread | | | Date | Wed, 18 Nov 2015 19:44:58 -0300 | From | Arnaldo Carvalho de Melo <> | Subject | perf BPF/elfdep intermitent build problems |
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Have you guys ever saw this?
[acme@zoo linux]$ alias m alias m='perf stat -e cycles make O=/tmp/build/perf -C tools/perf install-bin' [acme @zoo linux]$ m make: Entering directory '/home/git/linux/tools/perf' BUILD: Doing 'make -j4' parallel build make[2]: Nothing to be done for 'fixdep'. CC /tmp/build/perf/util/machine.o LD /tmp/build/perf/util/libperf-in.o No libelf found BPF API too old Makefile:191: recipe for target 'elfdep' failed make[2]: *** [elfdep] Error 255 make[2]: *** Waiting for unfinished jobs.... Makefile:194: recipe for target 'bpfdep' failed make[2]: *** [bpfdep] Error 255 Makefile.perf:434: recipe for target '/tmp/build/perf/libbpf.a' failed make[1]: *** [/tmp/build/perf/libbpf.a] Error 2 make[1]: *** Waiting for unfinished jobs.... LD /tmp/build/perf/libperf-in.o Makefile:87: recipe for target 'install-bin' failed make: *** [install-bin] Error 2 make: Leaving directory '/home/git/linux/tools/perf'
Performance counter stats for 'make O=/tmp/build/perf -C tools/perf install-bin':
10,265,920,369 cycles
3.002799545 seconds time elapsed
[acme@zoo linux]$
If I go and try doing a clean on the libbpf dir I see another problem:
[acme@zoo linux]$ cd tools/lib/bpf [acme@zoo bpf]$ make clean
Auto-detecting system features: ... libelf: [ OFF ] ... bpf: [ OFF ]
CLEAN libbpf CLEAN core-gen [acme@zoo bpf]$
No need for feature detection when doing a plain 'make clean', right?
But then, after cleaning it again, and entering tools/perf to do a 'make clean' as well, it does the feature detection at a second 'make clean' and this time it shoes [ on ] for both libelf and bpf, and this time I manage to build perf.
This is all intermitent, will eventually try to drill down if you don't fix it first
- Arnaldo
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