linux-kernel - Re: [PATCH 06/13] perf tools: Add compression id into struct kmod

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Date:   Fri, 17 Aug 2018 15:56:41 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Jiri Olsa <jolsa@...nel.org>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        David Ahern <dsahern@...il.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Michael Petlan <mpetlan@...hat.com>
Subject: Re: [PATCH 06/13] perf tools: Add compression id into struct
 kmod_path

Em Fri, Aug 17, 2018 at 03:28:49PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Fri, Aug 17, 2018 at 03:23:15PM -0300, Arnaldo Carvalho de Melo escreveu:
> > Em Fri, Aug 17, 2018 at 11:48:06AM +0200, Jiri Olsa escreveu:
> > >  static const struct {
> > >  	const char *fmt;
> > >  	int (*decompress)(const char *input, int output);
> > >  } compressions[] = {
> > > +	[COMP_ID__NONE] = { 0 },
> > 
> > 
> > This broke the build in many places, problems of this kind:
> > 
> >   CC       /tmp/build/perf/util/dso.o
> >   LD       /tmp/build/perf/scripts/python/Perf-Trace-Util/libperf-in.o
> >   LD       /tmp/build/perf/scripts/libperf-in.o
> >   CC       /tmp/build/perf/trace/beauty/clone.o
> >   CC       /tmp/build/perf/util/symbol.o
> > util/dso.c:201:24: error: missing field 'decompress' initializer [-Werror,-Wmissing-field-initializers]
> >         [COMP_ID__NONE] = { 0 },
> >                               ^
> > 1 error generated.
> >   CC       /tmp/build/perf/trace/beauty/fcntl.o
> > mv: cannot stat '/tmp/build/perf/util/.dso.o.tmp': No such file or directory
> > /git/linux/tools/build/Makefile.build:96: recipe for target '/tmp/build/perf/util/dso.o' failed
> > 
> > If we look just at those that failed, its several gcc versions:
> > 
> >   11     9.91 centos:5                      : FAIL gcc (GCC) 4.1.2 20080704 (Red Hat 4.1.2-55)
> >   12    14.34 centos:6                      : FAIL gcc (GCC) 4.4.7 20120313 (Red Hat 4.4.7-23)
> >   16    47.50 debian:9                      : FAIL gcc (Debian 6.3.0-18+deb9u1) 6.3.0 20170516
> >   28    53.92 fedora:25                     : FAIL gcc (GCC) 6.4.1 20170727 (Red Hat 6.4.1-1)
> >   29    60.75 fedora:26                     : FAIL gcc (GCC) 7.3.1 20180130 (Red Hat 7.3.1-2)
> >   30    90.76 fedora:27                     : FAIL gcc (GCC) 7.3.1 20180712 (Red Hat 7.3.1-6)
> >   41    12.78 oraclelinux:6                 : FAIL gcc (GCC) 4.4.7 20120313 (Red Hat 4.4.7-23.0.1)
> >   43    12.85 ubuntu:12.04.5                : FAIL gcc (Ubuntu/Linaro 4.6.3-1ubuntu5) 4.6.3
> >   46    45.56 ubuntu:16.04                  : FAIL gcc (Ubuntu 5.4.0-6ubuntu1~16.04.10) 5.4.0 20160609
> >   54    49.60 ubuntu:17.10                  : FAIL gcc (Ubuntu 7.2.0-8ubuntu3.2) 7.2.0
> 
> Sorry, gcc eats this with gusto, its just clang that is not taking it,
> for instance, this is the one in fedora:27:
> 
> clang version 5.0.2 (tags/RELEASE_502/final)

Nah, this cures it, and its not just clang, as we don't have it in the older
images like centos:5.

Patch below seems to cure in all cases, I'll do what is usual, use
designated initializers everywhere...

- Arnaldo

diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c
index 8ce3de665993..bbed90e5d9bb 100644
--- a/tools/perf/util/dso.c
+++ b/tools/perf/util/dso.c
@@ -198,7 +198,7 @@ static const struct {
 	int (*decompress)(const char *input, int output);
 	bool (*is_compressed)(const char *input);
 } compressions[] = {
-	[COMP_ID__NONE] = { 0 },
+	[COMP_ID__NONE] = { .fmt = NULL, },
 #ifdef HAVE_ZLIB_SUPPORT
 	{ "gz", gzip_decompress_to_file, gzip_is_compressed },
 #endif