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Subject[tip:perf/core] perf tools: Add missing open_memstream() prototype for systems lacking it
Commit-ID:  d7a8c4a6a055097a67ccfa3ca7c9ff1b64603a70
Gitweb: https://git.kernel.org/tip/d7a8c4a6a055097a67ccfa3ca7c9ff1b64603a70
Author: Arnaldo Carvalho de Melo <acme@redhat.com>
AuthorDate: Tue, 11 Dec 2018 16:31:19 -0300
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Tue, 18 Dec 2018 12:23:57 -0300

perf tools: Add missing open_memstream() prototype for systems lacking it

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@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lkml.kernel.org/n/tip-343ashae97e5bq6vizusyfno@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
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 265a9225e5fc..07c1857c3d7a 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

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