linux-kernel - Re: [PATCH] perf/jvmti: improve error message in Makefile

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Date:	Thu, 25 Feb 2016 10:45:42 -0300
From:	Arnaldo Carvalho de Melo <acme@...hat.com>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	linux-kernel@...r.kernel.org, peterz@...radead.org, mingo@...e.hu,
	ak@...ux.intel.com, kan.liang@...el.com, jolsa@...hat.com,
	namhyung@...nel.org, adrian.hunter@...el.com, acme@...nel.org
Subject: Re: [PATCH] perf/jvmti: improve error message in Makefile

Em Thu, Feb 25, 2016 at 06:27:36AM +0100, Stephane Eranian escreveu:
> This patch improves the error message given by jvmti Makefile
> when the alternatives command cannot be found. It now suggests
> the user locates the root of their Java installation and pass it
> with JDIR=

Thanks, tested on a RHEL6.7 VM without openjdk packages, works as
advertised.

Applied.

- Arnaldo
 
> Signed-off-by: Stephane Eranian <eranian@...gle.com>
> ---
>  tools/perf/jvmti/Makefile | 17 +++++++++++++----
>  1 file changed, 13 insertions(+), 4 deletions(-)
> 
> diff --git a/tools/perf/jvmti/Makefile b/tools/perf/jvmti/Makefile
> index 0277a64b391b..5ce61a1bda9c 100644
> --- a/tools/perf/jvmti/Makefile
> +++ b/tools/perf/jvmti/Makefile
> @@ -35,12 +35,21 @@ SOLIBEXT=so
>  
>  # The following works at least on fedora 23, you may need the next
>  # line for other distros.
> -ifeq (,$(wildcard /usr/sbin/update-java-alternatives))
> -JDIR=$(shell alternatives --display java | tail -1 | cut -d' ' -f 5 | sed 's%/jre/bin/java.%%g')
> -else
> +ifneq (,$(wildcard /usr/sbin/update-java-alternatives))
>  JDIR=$(shell /usr/sbin/update-java-alternatives -l | head -1 | cut -d ' ' -f 3)
> +else
> +  ifneq (,$(wildcard /usr/sbin/alternatives))
> +    JDIR=$(shell alternatives --display java | tail -1 | cut -d' ' -f 5 | sed 's%/jre/bin/java.%%g')
> +  endif
>  endif
> -
> +ifndef JDIR
> +$(error Could not find alternatives command, you need to set JDIR= to point to the root of your Java directory)
> +else
> +  ifeq (,$(wildcard $(JDIR)/include/jvmti.h))
> +  $(error the openjdk development package appears to me missing, install and try again)
> +  endif
> +endif
> +$(info Using Java from $(JDIR))
>  # -lrt required in 32-bit mode for clock_gettime()
>  LIBS=-lelf -lrt
>  INCDIR=-I $(JDIR)/include -I $(JDIR)/include/linux
> -- 
> 1.9.1