linux-kernel - [PATCH AUTOSEL 4.20 095/117] perf tools: Add missing open_memstream() prototype for systems lacking it

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Message-Id: <20190108192628.121270-95-sashal@kernel.org>
Date:   Tue,  8 Jan 2019 14:26:03 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Arnaldo Carvalho de Melo <acme@...hat.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 4.20 095/117] perf tools: Add missing open_memstream() prototype for systems lacking it

From: Arnaldo Carvalho de Melo <acme@...hat.com>

[ Upstream commit d7a8c4a6a055097a67ccfa3ca7c9ff1b64603a70 ]

There are systems such as the Android NDK API level 24 has the
open_memstream() function but doesn't provide a prototype, adding noise
to the build:

  builtin-timechart.c: In function 'cat_backtrace':
  builtin-timechart.c:486:2: warning: implicit declaration of function 'open_memstream' [-Wimplicit-function-declaration]
    FILE *f = open_memstream(&p, &p_len);
    ^
  builtin-timechart.c:486:2: warning: nested extern declaration of 'open_memstream' [-Wnested-externs]
  builtin-timechart.c:486:12: warning: initialization makes pointer from integer without a cast
    FILE *f = open_memstream(&p, &p_len);
              ^

Define a LACKS_OPEN_MEMSTREAM_PROTOTYPE define so that code needing that
can get a prototype.

Checked in the bionic git repo to be available since level 23:

https://android.googlesource.com/platform/bionic/+/master/libc/include/stdio.h#241

  FILE* open_memstream(char** __ptr, size_t* __size_ptr) __INTRODUCED_IN(23);

Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Link: https://lkml.kernel.org/n/tip-343ashae97e5bq6vizusyfno@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 tools/perf/Makefile.config     | 1 +
 tools/perf/builtin-timechart.c | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
index e106e7ce6933..acbb657f7ce2 100644
--- a/tools/perf/Makefile.config
+++ b/tools/perf/Makefile.config
@@ -295,6 +295,7 @@ ifndef NO_BIONIC
   ifeq ($(feature-bionic), 1)
     BIONIC := 1
     CFLAGS += -DLACKS_SIGQUEUE_PROTOTYPE
+    CFLAGS += -DLACKS_OPEN_MEMSTREAM_PROTOTYPE
     EXTLIBS := $(filter-out -lrt,$(EXTLIBS))
     EXTLIBS := $(filter-out -lpthread,$(EXTLIBS))
   endif
diff --git a/tools/perf/builtin-timechart.c b/tools/perf/builtin-timechart.c
index a827919c6263..775b99833e51 100644
--- a/tools/perf/builtin-timechart.c
+++ b/tools/perf/builtin-timechart.c
@@ -43,6 +43,10 @@
 #include "util/data.h"
 #include "util/debug.h"
 
+#ifdef LACKS_OPEN_MEMSTREAM_PROTOTYPE
+FILE *open_memstream(char **ptr, size_t *sizeloc);
+#endif
+
 #define SUPPORT_OLD_POWER_EVENTS 1
 #define PWR_EVENT_EXIT -1
 
-- 
2.19.1