linux-kernel - Re: [PATCHv2 00/36] perf tools: New build framework

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Date:	Fri, 16 Jan 2015 13:41:28 +0000
From:	Will Deacon <will.deacon@....com>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Mark Rutland <Mark.Rutland@....com>, Jiri Olsa <jolsa@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Alexis Berlemont <alexis.berlemont@...il.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Anton Blanchard <anton@...ba.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Borislav Petkov <bp@...en8.de>, Borislav Petkov <bp@...e.de>,
	Cody P Schafer <cody@...ux.vnet.ibm.com>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	David Ahern <dsahern@...il.com>,
	Florian Fainelli <florian@...nwrt.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	"msalter@...hat.com" <msalter@...hat.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <peterz@...radead.org>,
	"S. Lockwood-Childs" <sjl@...labs.com>,
	Sam Ravnborg <sam@...nborg.org>,
	Sasha Levin <sasha.levin@...cle.com>,
	Stephane Eranian <eranian@...gle.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Subject: Re: [PATCHv2 00/36] perf tools: New build framework

On Fri, Jan 16, 2015 at 12:43:49PM +0000, Jiri Olsa wrote:
> On Fri, Jan 16, 2015 at 01:30:13PM +0100, Jiri Olsa wrote:
> > On Fri, Jan 16, 2015 at 12:22:21PM +0000, Will Deacon wrote:
> > > On Fri, Jan 16, 2015 at 12:12:14PM +0000, Mark Rutland wrote:
> > > > I just tried a cross-build for arm, and that blew up when trying to do
> > > > something with arch/arm/util/libperf-in.o (log below). I bisected that
> > > > to f169fbc4c59dd9d4 "perf build: Add arch x86 objects building". I'm
> > > > looking into why now.
> > > 
> > > I get a similar failure doing a native arm64 build. I think the problem is
> > > because the arch/ files for arm and arm64 aren't always required (i.e. there
> > > are configurations where nothing is built under there) and, consequently,
> > > libperf-in.o isn't actually needed and we try to link against something that
> > > doesn't exist.
> > 
> > exactly ;-) I'll spin v3 shortly..
> 
> this fixes the issue for me

Same for me, thanks!

Tested-by: Will Deacon <will.deacon@....com>

Will

> ---
> diff --git a/tools/build/Makefile.build b/tools/build/Makefile.build
> index d35b66014992..396b33b124d1 100644
> --- a/tools/build/Makefile.build
> +++ b/tools/build/Makefile.build
> @@ -52,7 +52,7 @@ quiet_cmd_cc_s_c = AS       $@
>  
>  # Link agregate command
>  quiet_cmd_ld_multi = LD       $@
> -      cmd_ld_multi = $(LD) -r -o $@ $^
> +      cmd_ld_multi = $(LD) -r -o $@ $(wildcard $^)
>  
>  # Build rules
>  $(OUTPUT)%.o: %.c FORCE
> 
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