From mboxrd@z Thu Jan 1 00:00:00 1970 From: Milian Wolff Subject: Re: Building perf with clang Date: Sat, 02 Apr 2016 23:33:43 +0200 Message-ID: <8653343.K9AKxD7J31@agathebauer> References: <2572584.yi1Xp0m2mb@agathebauer> <20160401221602.GH7115@kernel.org> Mime-Version: 1.0 Content-Type: multipart/signed; boundary="nextPart3128686.hIEsYmO9F6"; micalg="sha1"; protocol="application/pkcs7-signature" Return-path: Received: from mail.kdab.com ([176.9.126.58]:49085 "EHLO mail.kdab.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750762AbcDBVdv (ORCPT ); Sat, 2 Apr 2016 17:33:51 -0400 In-Reply-To: <20160401221602.GH7115@kernel.org> Sender: linux-perf-users-owner@vger.kernel.org List-ID: To: Arnaldo Carvalho de Melo Cc: linux-perf-users@vger.kernel.org --nextPart3128686.hIEsYmO9F6 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" On Freitag, 1. April 2016 19:16:02 CEST Arnaldo Carvalho de Melo wrote: > Em Fri, Apr 01, 2016 at 11:19:05PM +0200, Milian Wolff escreveu: > > Hey all, > > > > I usually use clang to build my code, and have configured CC and CXX > > globally for that purpose. When I forget to unset that before I run > > "make" in the perf folder, I get into serious trouble as that is not > > supported at all. > > > > So, can that be fixed, either by making perf buildable with clang, or by > > enforcing GCC within the Makefile if clang is not supported? Or at least > > error out early if clang would be used? > > I never tried, but I have it installed to test perf + BPF, so I'll try > it, fixing things as I go, patches welcome, as I'll start this tomorrow, > at the earliest. Just FYI, this is the error I'm seeing: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ CC=clang make makeobj[0]: Entering directory `/home/milian/projects/src/linux/tools/perf' BUILD: Doing 'make -j4' parallel build warning: unknown warning option '-Wstrict-aliasing=3'; did you mean '-Wstring- plus-int'? [-Wunknown-warning-option] 1 warning generated. Auto-detecting system features: ... dwarf: [ on ] ... glibc: [ on ] ... gtk2: [ on ] ... libaudit: [ on ] ... libbfd: [ on ] ... libelf: [ on ] ... libnuma: [ on ] ... numa_num_possible_cpus: [ on ] ... libperl: [ on ] ... libpython: [ on ] ... libslang: [ on ] ... libcrypto: [ on ] ... libunwind: [ on ] ... libdw-dwarf-unwind: [ on ] ... zlib: [ on ] ... lzma: [ on ] ... get_cpuid: [ on ] ... bpf: [ on ] GEN common-cmds.h CC fixdep.o cat: ./.fixdep.o.d: No such file or directory /home/milian/projects/src/linux/tools/build/Makefile.build:77: recipe for target 'fixdep.o' failed make[3]: *** [fixdep.o] Error 1 Makefile:36: recipe for target 'fixdep-in.o' failed make[2]: *** [fixdep-in.o] Error 2 /home/milian/projects/src/linux/tools/build/Makefile.include:7: recipe for target 'fixdep' failed make[1]: *** [fixdep] Error 2 make[1]: *** Waiting for unfinished jobs.... PERF_VERSION = 4.2.rc6.g7a9420 make[1]: *** wait: No child processes. Stop. Makefile:68: recipe for target 'all' failed make: *** [all] Error 2 makeobj[0]: Leaving directory `/home/milian/projects/src/linux/tools/perf' ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ I have no clue what's going on here, I never edit Makefiles by hand... Speaking of Makefiles, how can I change the CFLAGS when building perf (with GCC)? I.e. how can I build it in -O0, or how can I enable sanitizers? Thanks -- Milian Wolff | milian.wolff@kdab.com | Software Engineer KDAB (Deutschland) GmbH&Co KG, a KDAB Group company Tel: +49-30-521325470 KDAB - The Qt Experts --nextPart3128686.hIEsYmO9F6 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIUdzCCBGYw ggNOoAMCAQICEFEmCpMc4n+cw6VfeeByroIwDQYJKoZIhvcNAQEFBQAwgZMxCzAJBgNVBAYTAlVT MQswCQYDVQQIEwJVVDEXMBUGA1UEBxMOU2FsdCBMYWtlIENpdHkxHjAcBgNVBAoTFVRoZSBVU0VS VFJVU1QgTmV0d29yazEhMB8GA1UECxMYaHR0cDovL3d3dy51c2VydHJ1c3QuY29tMRswGQYDVQQD ExJVVE4gLSBEQVRBQ29ycCBTR0MwHhcNMDUwNjA3MDgwOTEwWhcNMTkwNjI0MTkwNjMwWjBvMQsw CQYDVQQGEwJTRTEUMBIGA1UEChMLQWRkVHJ1c3QgQUIxJjAkBgNVBAsTHUFkZFRydXN0IEV4dGVy bmFsIFRUUCBOZXR3b3JrMSIwIAYDVQQDExlBZGRUcnVzdCBFeHRlcm5hbCBDQSBSb290MIIBIjAN BgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAt/caM+byAAQtOeBOW+0fvGwPzbX6I7bO3psRM5ek 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