linux-kernel - Re: [PATCH tracing/kprobes v2 4/5] perf: Add perf probe subcommand for kprobe-event setup helper

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Message-Id: <1254819822.21044.125.camel@laptop>
Date:	Tue, 06 Oct 2009 11:03:42 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Masami Hiramatsu <mhiramat@...hat.com>
Cc:	rostedt@...dmis.org, Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	lkml <linux-kernel@...r.kernel.org>,
	systemtap <systemtap@...rces.redhat.com>,
	DLE <dle-develop@...ts.sourceforge.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Mike Galbraith <efault@....de>,
	Paul Mackerras <paulus@...ba.org>,
	Christoph Hellwig <hch@...radead.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Jim Keniston <jkenisto@...ibm.com>,
	"Frank Ch. Eigler" <fche@...hat.com>
Subject: Re: [PATCH tracing/kprobes v2 4/5] perf: Add perf probe subcommand
 for kprobe-event setup helper

On Mon, 2009-10-05 at 20:57 -0400, Masami Hiramatsu wrote:
> >> +ifneq ($(shell sh -c "(echo '\#include <libdwarf/dwarf.h>'; echo '\#include <libdwarf/libdwarf.h>'; echo 'int main(void) { Dwarf_Debug dbg; Dwarf_Error err; dwarf_init(0, DW_DLC_READ, 0, 0, &dbg, &err); return (long)dbg; }') | $(CC) -x c - $(ALL_CFLAGS) -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -ldwarf -lelf -o /dev/null $(ALL_LDFLAGS) > /dev/null 2>&1 && echo y"), y)
> >> +    msg := $(warning No libdwarf.h found, disables probe subcommand. Please install libdwarf-dev/libdwarf-devel);
> > 
> > Wow! And I thought my macros were ugly ;-)
> 
> :-)
> Maybe, would I better make a separate c file to check this?
> Like "autoconf-checkdwarf.c".

I'm the one who started this trend.. Maybe putting all those tests in a
static .c file makes sense now, put them in a tests/ or checks/
directory though, so it doesn't litter the regular files.

Then again,.. the actual .c file is only half that line, so it doesn't
really clean up that much.

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