perf header: Fix up argument to ctime()

Reducing this noise when cross building to the Android NDK:

  util/header.c: In function 'perf_header__fprintf_info':
  util/header.c:2710:45: warning: pointer targets in passing argument 1 of 'ctime' differ in signedness [-Wpointer-sign]
    fprintf(fp, "# captured on    : %s", ctime(&st.st_ctime));
                                               ^
  In file included from util/../perf.h:5:0,
                   from util/evlist.h:11,
                   from util/header.c:22:
  /opt/android-ndk-r15c/platforms/android-26/arch-arm/usr/include/time.h:81:14: note: expected 'const time_t *' but argument is of type 'long unsigned int *'
   extern char* ctime(const time_t*) __LIBC_ABI_PUBLIC__;
                ^

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-6bz74zp080yhmtiwb36enso9@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 1171d8400bf43e65cd5fa786545964205cbb34e5..dec6d218c31c326ceac4d4464c8c9ce012a1be61 100644 (file)
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -2698,6 +2698,7 @@ int perf_header__fprintf_info(struct perf_session *session, FILE *fp, bool full)
        struct perf_header *header = &session->header;
        int fd = perf_data__fd(session->data);
        struct stat st;
+       time_t stctime;
        int ret, bit;
 
        hd.fp = fp;
@@ -2707,7 +2708,8 @@ int perf_header__fprintf_info(struct perf_session *session, FILE *fp, bool full)
        if (ret == -1)
                return -1;
 
-       fprintf(fp, "# captured on    : %s", ctime(&st.st_ctime));
+       stctime = st.st_ctime;
+       fprintf(fp, "# captured on    : %s", ctime(&stctime));
 
        fprintf(fp, "# header version : %u\n", header->version);
        fprintf(fp, "# data offset    : %" PRIu64 "\n", header->data_offset);