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Date:   Sun, 12 Feb 2017 10:46:55 +0800
From:   Wang YanQing <udknight@...il.com>
To:     acme@...nel.org
Cc:     jolsa@...nel.org, mingo@...nel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] tools:perf:scripting-engines: Fix compile error with some
 perl5 versions

Fix below compile error:
CC       util/scripting-engines/trace-event-perl.o
In file included from /usr/lib/perl5/5.22.2/i686-linux/CORE/perl.h:5673:0,
                 from util/scripting-engines/trace-event-perl.c:31:
/usr/lib/perl5/5.22.2/i686-linux/CORE/inline.h: In function 'S__is_utf8_char_slow':
/usr/lib/perl5/5.22.2/i686-linux/CORE/inline.h:270:5: error: nested extern declaration of 'Perl___notused' [-Werror=nested-externs]
        dTHX;   /* The function called below requires thread context */
			     ^
cc1: all warnings being treated as errors

After digging perl5 repository, I find out that we will meet this compile error
with perl from v5.21.1 to v5.25.4

Signed-off-by: Wang YanQing <udknight@...il.com>
---
 tools/perf/util/scripting-engines/Build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/scripting-engines/Build b/tools/perf/util/scripting-engines/Build
index 6516e22..82d28c6 100644
--- a/tools/perf/util/scripting-engines/Build
+++ b/tools/perf/util/scripting-engines/Build
@@ -1,6 +1,6 @@
 libperf-$(CONFIG_LIBPERL)   += trace-event-perl.o
 libperf-$(CONFIG_LIBPYTHON) += trace-event-python.o
 
-CFLAGS_trace-event-perl.o += $(PERL_EMBED_CCOPTS) -Wno-redundant-decls -Wno-strict-prototypes -Wno-unused-parameter -Wno-shadow -Wno-undef -Wno-switch-default
+CFLAGS_trace-event-perl.o += $(PERL_EMBED_CCOPTS) -Wno-redundant-decls -Wno-strict-prototypes -Wno-unused-parameter -Wno-shadow -Wno-nested-externs -Wno-undef -Wno-switch-default
 
 CFLAGS_trace-event-python.o += $(PYTHON_EMBED_CCOPTS) -Wno-redundant-decls -Wno-strict-prototypes -Wno-unused-parameter -Wno-shadow
-- 
1.8.5.6.2.g3d8a54e.dirty

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