linux-kernel - Re: [PATCH 4.4 14/43] tools build: fix # escaping in .cmd files for future Make

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Date:   Tue, 17 Jul 2018 22:51:29 +0300
From:   Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Randy Dunlap <rdunlap@...radead.org>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Paul Menzel <pmenzel@...gen.mpg.de>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>
Subject: Re: [PATCH 4.4 14/43] tools build: fix # escaping in .cmd files for
 future Make

On 17.07.2018 16:15, Greg Kroah-Hartman wrote:
> On Tue, Jul 17, 2018 at 03:57:21PM +0300, Konstantin Khlebnikov wrote:
>> This commit depends on commit 9564a8cf422d7b58f6e857e3546d346fa970191e
>> "Kbuild: fix # escaping in .cmd files for future Make"
>> which is missing in 4.4.141
>>
>>
>> this breaks compilation of tools/perf for me
>>
>> make -C tools/perf V=1 JOBS=24 WERROR=0 NO_GTK2=1 LDFLAGS=-static all
>> make[1]: Entering directory `/tmp/buildd/linux-yandex-4.4.141/tools/perf'
>>    BUILD:   Doing 'make -j24' parallel build
>>
>> Auto-detecting system features:
>> ...                         dwarf: [ on  ]
>> ...            dwarf_getlocations: [ OFF ]
>> ...                         glibc: [ on  ]
>> ...                          gtk2: [ OFF ]
>> ...                      libaudit: [ on  ]
>> ...                        libbfd: [ on  ]
>> ...                        libelf: [ on  ]
>> ...                       libnuma: [ on  ]
>> ...        numa_num_possible_cpus: [ on  ]
>> ...                       libperl: [ OFF ]
>> ...                     libpython: [ OFF ]
>> ...                      libslang: [ on  ]
>> ...                     libunwind: [ on  ]
>> ...            libdw-dwarf-unwind: [ OFF ]
>> ...                          zlib: [ on  ]
>> ...                          lzma: [ on  ]
>> ...                     get_cpuid: [ on  ]
>> ...                           bpf: [ on  ]
>>
>> config/Makefile:274: No libdw DWARF unwind found, Please install elfutils-devel/libdw-dev >= 0.158 and/or set LIBDW_DIR
>> config/Makefile:282: Old libdw.h, finding variables at given 'perf probe' point will not work, install elfutils-devel/libdw-dev >= 0.157
>> config/Makefile:458: Missing perl devel files. Disabling perl scripting support, please install perl-ExtUtils-Embed/libperl-dev
>> config/Makefile:501: No 'Python.h' (for Python 2.x support) was found: disables Python support - please install python-devel/python-dev
>> $(:)
>> make -C /tmp/buildd/linux-yandex-4.4.141/tools/build fixdep
>> /bin/sh util/PERF-VERSION-GEN
>> make -f /tmp/buildd/linux-yandex-4.4.141/tools/build/Makefile.build dir=. obj=fixdep
>> . util/generate-cmdlist.sh > common-cmds.h+ && mv common-cmds.h+ common-cmds.h
>> .fixdep.o.cmd:1: *** missing separator.  Stop.
>> make[3]: *** [fixdep-in.o] Error 2
>> make[2]: *** [fixdep] Error 2
> 
> Ok, backporting the Makefile fixes resolves this issue.  But perf still
> fails to build for me due to some futex errors, which is odd, do you see
> that too?

Compilation fails only for modern glibc, like in ubuntu 18.04 bionic.
Xenial 16.04 and precise 12.04 are fine.

I've bisected to indirect fix in linux 4.8
commit cec07f53c398f22576df77052c4777dc13f14962
("perf tools: Move syscall number fallbacks from perf-sys.h to tools/arch/x86/include/asm/")

To 4.4.y it applies clearly.

> 
> thanks,
> 
> greg k-h
>