linux-kernel - [PATCH 2/2] perf: squelch warnings from perl.h to compile-pass

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Date:	Thu,  4 Jul 2013 19:10:46 +0530
From:	Ramkumar Ramachandra <artagnon@...il.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Namhyung Kim <namhyung.kim@....com>
Subject: [PATCH 2/2] perf: squelch warnings from perl.h to compile-pass

Currently, a simple

  $ make

errors out because we compile with -Werror by default, turning all
warnings into errors.  Although no warnings are emitted by our code
itself, two kinds of warnings are emitted by perl.h (perl 5.18.0):

  -Wundef and -Wswitch-default

Use #pragma statements to squelch exactly those warnings, and get perf
to compile-pass by default.

Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Namhyung Kim <namhyung.kim@....com>
Signed-off-by: Ramkumar Ramachandra <artagnon@...il.com>
---
 tools/perf/config/feature-tests.mak                  |  5 +++++
 tools/perf/scripts/perl/Perf-Trace-Util/Context.c    | 10 ++++++++--
 tools/perf/scripts/perl/Perf-Trace-Util/Context.xs   | 10 ++++++++--
 tools/perf/util/scripting-engines/trace-event-perl.c |  5 +++++
 4 files changed, 26 insertions(+), 4 deletions(-)

diff --git a/tools/perf/config/feature-tests.mak b/tools/perf/config/feature-tests.mak
index 708fb8e..91fa083 100644
--- a/tools/perf/config/feature-tests.mak
+++ b/tools/perf/config/feature-tests.mak
@@ -103,7 +103,12 @@ endif
 ifndef NO_LIBPERL
 define SOURCE_PERL_EMBED
 #include <EXTERN.h>
+
+#pragma GCC diagnostic ignored \"-Wundef\"
+#pragma GCC diagnostic ignored \"-Wswitch-default\"
 #include <perl.h>
+#pragma GCC diagnostic error \"-Wundef\"
+#pragma GCC diagnostic error \"-Wswitch-default\"
 
 int main(void)
 {
diff --git a/tools/perf/scripts/perl/Perf-Trace-Util/Context.c b/tools/perf/scripts/perl/Perf-Trace-Util/Context.c
index 790ceba..0807294 100644
--- a/tools/perf/scripts/perl/Perf-Trace-Util/Context.c
+++ b/tools/perf/scripts/perl/Perf-Trace-Util/Context.c
@@ -28,8 +28,14 @@
  *
  */
 
-#include "EXTERN.h"
-#include "perl.h"
+#include <EXTERN.h>
+
+#pragma GCC diagnostic ignored "-Wundef"
+#pragma GCC diagnostic ignored "-Wswitch-default"
+#include <perl.h>
+#pragma GCC diagnostic error "-Wundef"
+#pragma GCC diagnostic error "-Wswitch-default"
+
 #include "XSUB.h"
 #include "../../../perf.h"
 #include "../../../util/trace-event.h"
diff --git a/tools/perf/scripts/perl/Perf-Trace-Util/Context.xs b/tools/perf/scripts/perl/Perf-Trace-Util/Context.xs
index c1e2ed1..cd46e01 100644
--- a/tools/perf/scripts/perl/Perf-Trace-Util/Context.xs
+++ b/tools/perf/scripts/perl/Perf-Trace-Util/Context.xs
@@ -19,8 +19,14 @@
  *
  */
 
-#include "EXTERN.h"
-#include "perl.h"
+#include <EXTERN.h>
+
+#pragma GCC diagnostic ignored "-Wundef"
+#pragma GCC diagnostic ignored "-Wswitch-default"
+#include <perl.h>
+#pragma GCC diagnostic error "-Wundef"
+#pragma GCC diagnostic error "-Wswitch-default"
+
 #include "XSUB.h"
 #include "../../../perf.h"
 #include "../../../util/script-event.h"
diff --git a/tools/perf/util/scripting-engines/trace-event-perl.c b/tools/perf/util/scripting-engines/trace-event-perl.c
index eacec85..aa3c11e 100644
--- a/tools/perf/util/scripting-engines/trace-event-perl.c
+++ b/tools/perf/util/scripting-engines/trace-event-perl.c
@@ -27,7 +27,12 @@
 
 #include "../util.h"
 #include <EXTERN.h>
+
+#pragma GCC diagnostic ignored "-Wundef"
+#pragma GCC diagnostic ignored "-Wswitch-default"
 #include <perl.h>
+#pragma GCC diagnostic error "-Wundef"
+#pragma GCC diagnostic error "-Wswitch-default"
 
 #include "../../perf.h"
 #include "../thread.h"
-- 
1.8.3.1.643.gebeea52.dirty

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