linux-kernel - Re: [PATCH 05/36] perf build: Disable make's built-in rules and variables

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Date:	Thu, 15 Jan 2015 09:01:05 -0700
From:	David Ahern <dsahern@...il.com>
To:	Jiri Olsa <jolsa@...nel.org>, linux-kernel@...r.kernel.org
CC:	Alexis Berlemont <alexis.berlemont@...il.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 05/36] perf build: Disable make's built-in rules and variables

On 1/15/15 5:55 AM, Jiri Olsa wrote:

> diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
> index 1f71a32aea78..dd49b40e203b 100644
> --- a/tools/perf/Makefile.perf
> +++ b/tools/perf/Makefile.perf
> @@ -84,6 +84,10 @@ ifneq ($(OUTPUT),)
>   #$(info Determined 'OUTPUT' to be $(OUTPUT))
>   endif
>
> +# Do not use make's built-in rules and variables
> +# (this increases performance and avoids hard-to-debug behaviour);
> +MAKEFLAGS += -rR
> +
>   $(OUTPUT)PERF-VERSION-FILE: ../../.git/HEAD
>   	@$(SHELL_PATH) util/PERF-VERSION-GEN $(OUTPUT)
>   	@touch $(OUTPUT)PERF-VERSION-FILE

Does this depend on any prior patch? Was not obvious to me. Adding just 
this patch to a fresh build and it blows up.

$ vi Makefile.perf
- add line above
$ mkdir /tmp/junk2
$ make O=/tmp/junk2
...
  CC       /tmp/junk2/fs/debugfs.o
   CC       /tmp/junk2/fs/fs.o
   CC       /tmp/junk2/fd/array.o
/bin/sh: .event-parse.d: command not found
/bin/sh: .trace-seq.d: command not found
/bin/sh: .event-plugin.d: command not found
make[3]: *** [.event-parse.d] Error 127
make[3]: *** Waiting for unfinished jobs....
...

This is on a Fedora 16 host.

David
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