linux-kernel - Re: [PATCH v7 perf,bpf 11/15] perf: add -lopcodes to feature-libbfd

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Message-ID: <20190307232631.GA5481@mini-arch.hsd1.ca.comcast.net>
Date:   Thu, 7 Mar 2019 15:26:31 -0800
From:   Stanislav Fomichev <sdf@...ichev.me>
To:     Song Liu <songliubraving@...com>
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, ast@...nel.org, daniel@...earbox.net,
        kernel-team@...com, peterz@...radead.org, acme@...hat.com,
        jolsa@...nel.org, namhyung@...nel.org
Subject: Re: [PATCH v7 perf,bpf 11/15] perf: add -lopcodes to feature-libbfd

On 03/07, Song Liu wrote:
> Both libbfd and libopcodes are distributed with binutil-dev/devel. When
> libbfd presents, it is OK to assume libopcodes also presents. This has
> been a safe assumption for bpftool.
> 
> This patch adds -lopcodes to perf/Makefile.config. libopcodes will be
> used in the next commit for bpf annotation.
> 
> Signed-off-by: Song Liu <songliubraving@...com>
> ---
>  tools/perf/Makefile.config | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
> index b441c88cafa1..e0bafbc273af 100644
> --- a/tools/perf/Makefile.config
> +++ b/tools/perf/Makefile.config
> @@ -701,7 +701,7 @@ else
>  endif
>  
>  ifeq ($(feature-libbfd), 1)
> -  EXTLIBS += -lbfd
> +  EXTLIBS += -lbfd -lopcodes
I think you need to add -lopcodes to the other feature checks as
well (to work on the systems which require -liberty and/or -lz for
libfd):

--

diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
index b441c88cafa1..3fa2f5d7d54f 100644
--- a/tools/perf/Makefile.config
+++ b/tools/perf/Makefile.config
@@ -701,7 +701,7 @@ else
 endif
 
 ifeq ($(feature-libbfd), 1)
-  EXTLIBS += -lbfd
+  EXTLIBS += -lbfd -lopcodes
 else
   # we are on a system that requires -liberty and (maybe) -lz
   # to link against -lbfd; test each case individually here
@@ -712,10 +712,10 @@ else
   $(call feature_check,libbfd-liberty-z)
 
   ifeq ($(feature-libbfd-liberty), 1)
-    EXTLIBS += -lbfd -liberty
+    EXTLIBS += -lbfd -lopcodes -liberty
   else
     ifeq ($(feature-libbfd-liberty-z), 1)
-      EXTLIBS += -lbfd -liberty -lz
+      EXTLIBS += -lbfd -lopcodes -liberty -lz
     endif
   endif
 endif

>  else
>    # we are on a system that requires -liberty and (maybe) -lz
>    # to link against -lbfd; test each case individually here
> -- 
> 2.17.1
>