linux-kernel - [PATCH] perf: move two mandatory variables out of perf.c

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Message-Id: <20170117002237.c1aec0ce3b4d675dca018deb@m.soramichi.jp>
Date:   Tue, 17 Jan 2017 00:22:37 +0900
From:   Soramichi AKIYAMA <akiyama@...oramichi.jp>
To:     linux-kernel@...r.kernel.org
Cc:     peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        alexander.shishkin@...ux.intel.com
Subject: [PATCH] perf: move two mandatory variables out of perf.c

use_browser and perf_version_string are both declared in perf.c
but they are also referenced by other functions of libperf.a.

Therefore a user linking an own main() with libperf.a must
declare those two variables in their files even if the files
never use the browser or the version information.

This patch fixes this issue by moving use_browser and
perf_version_string out of perf.c to some other files.

Signed-off-by: Soramichi Akiyama <akiyama@...oramichi.jp>
---
 tools/perf/Build         | 3 +--
 tools/perf/perf.c        | 3 ---
 tools/perf/ui/setup.c    | 1 +
 tools/perf/util/Build    | 1 +
 tools/perf/util/header.c | 2 ++
 5 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/tools/perf/Build b/tools/perf/Build
index 0b48806..7039ecb 100644
--- a/tools/perf/Build
+++ b/tools/perf/Build
@@ -40,8 +40,7 @@ CFLAGS_builtin-help.o      += $(paths)
 CFLAGS_builtin-timechart.o += $(paths)
 CFLAGS_perf.o              += -DPERF_HTML_PATH="BUILD_STR($(htmldir_SQ))"	\
 			      -DPERF_EXEC_PATH="BUILD_STR($(perfexecdir_SQ))"	\
-			      -DPREFIX="BUILD_STR($(prefix_SQ))"		\
-			      -include $(OUTPUT)PERF-VERSION-FILE
+			      -DPREFIX="BUILD_STR($(prefix_SQ))"
 CFLAGS_builtin-trace.o	   += -DSTRACE_GROUPS_DIR="BUILD_STR($(STRACE_GROUPS_DIR_SQ))"
 CFLAGS_builtin-report.o	   += -DTIPDIR="BUILD_STR($(tipdir_SQ))"
 CFLAGS_builtin-report.o	   += -DDOCDIR="BUILD_STR($(srcdir_SQ)/Documentation)"
diff --git a/tools/perf/perf.c b/tools/perf/perf.c
index 13c8a7d..0324cd1 100644
--- a/tools/perf/perf.c
+++ b/tools/perf/perf.c
@@ -29,7 +29,6 @@ const char perf_usage_string[] =
 const char perf_more_info_string[] =
 	"See 'perf help COMMAND' for more information on a specific command.";
 
-int use_browser = -1;
 static int use_pager = -1;
 const char *input_name;
 
@@ -330,8 +329,6 @@ static int handle_alias(int *argcp, const char ***argv)
 	return ret;
 }
 
-const char perf_version_string[] = PERF_VERSION;
-
 #define RUN_SETUP	(1<<0)
 #define USE_PAGER	(1<<1)
 
diff --git a/tools/perf/ui/setup.c b/tools/perf/ui/setup.c
index 1f6b099..50d13e58 100644
--- a/tools/perf/ui/setup.c
+++ b/tools/perf/ui/setup.c
@@ -7,6 +7,7 @@
 
 pthread_mutex_t ui__lock = PTHREAD_MUTEX_INITIALIZER;
 void *perf_gtk_handle;
+int use_browser = -1;
 
 #ifdef HAVE_GTK2_SUPPORT
 static int setup_gtk_browser(void)
diff --git a/tools/perf/util/Build b/tools/perf/util/Build
index 3840e3a..5da376b 100644
--- a/tools/perf/util/Build
+++ b/tools/perf/util/Build
@@ -162,6 +162,7 @@ CFLAGS_rbtree.o        += -Wno-unused-parameter -DETC_PERFCONFIG="BUILD_STR($(ET
 CFLAGS_libstring.o     += -Wno-unused-parameter -DETC_PERFCONFIG="BUILD_STR($(ETC_PERFCONFIG_SQ))"
 CFLAGS_hweight.o       += -Wno-unused-parameter -DETC_PERFCONFIG="BUILD_STR($(ETC_PERFCONFIG_SQ))"
 CFLAGS_parse-events.o  += -Wno-redundant-decls
+CFLAGS_header.o        += -include $(OUTPUT)PERF-VERSION-FILE
 
 $(OUTPUT)util/kallsyms.o: ../lib/symbol/kallsyms.c FORCE
 	$(call rule_mkdir)
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index d89c9c7..00fd8a8 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -41,6 +41,8 @@ static const u64 __perf_magic2_sw = 0x50455246494c4532ULL;
 
 #define PERF_MAGIC	__perf_magic2
 
+const char perf_version_string[] = PERF_VERSION;
+
 struct perf_file_attr {
 	struct perf_event_attr	attr;
 	struct perf_file_section	ids;
-- 
2.1.4