[PATCH v3 3/5] perf: squelch warnings from perl.h to compile-pass

[Ramkumar Ramachandra <artagnon@gmail.com>]

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, making perf
compile-pass.

Helped-by: Namhyung Kim <namhyung@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
---
 tools/perf/util/perl.h | 10 ++++++++++
 1 file changed, 10 insertions(+)
 create mode 100644 tools/perf/util/perl.h

diff --git a/tools/perf/util/perl.h b/tools/perf/util/perl.h
new file mode 100644
index 0000000..862d08d
--- /dev/null
+++ b/tools/perf/util/perl.h
@@ -0,0 +1,10 @@
+#ifndef __PERF_PERL_H
+#define __PERF_PERL_H
+
+#pragma GCC diagnostic ignored "-Wundef"
+#pragma GCC diagnostic ignored "-Wswitch-default"
+#include_next <perl.h>
+#pragma GCC diagnostic error "-Wundef"
+#pragma GCC diagnostic error "-Wswitch-default"
+
+#endif
-- 
1.8.3.2.736.g869de25