[PATCH v3 4/5] perf: Support perf -vv

From: Jin Yao
Date: Thu Mar 29 2018 - 03:02:48 EST


We keep having bug reports that when users build perf on their own,
but they don't install some needed libraries such as libelf,
libbfd/libibery.

The perf can build, but it is missing important functionality.

This patch provides a new option '-vv' for perf which will
print the compiled-in status of libraries.

The 'perf -vv' is mapped to 'perf version --build-options'.

For example:

$ ./perf -vv

perf version 4.13.rc5.g4c1df1
dwarf: [ on ]
dwarf_getlocations: [ on ]
glibc: [ on ]
gtk2: [ on ]
libaudit: [ OFF ]
libbfd: [ on ]
libelf: [ on ]
libnuma: [ on ]
numa_num_possible_cpus: [ on ]
libperl: [ on ]
libpython: [ on ]
libslang: [ on ]
libcrypto: [ on ]
libunwind: [ on ]
libdw-dwarf-unwind: [ on ]
zlib: [ on ]
lzma: [ on ]
get_cpuid: [ on ]
bpf: [ on ]

v3:
---
One bug is found in v2. It didn't process the option like '-vabc'
correctly. Fix this bug.

v2:
---
Use a global variable version_verbose to record the number of 'v'.

Signed-off-by: Jin Yao <yao.jin@xxxxxxxxxxxxxxx>
---
tools/perf/perf.c | 6 ++++++
tools/perf/perf.h | 1 +
2 files changed, 7 insertions(+)

diff --git a/tools/perf/perf.c b/tools/perf/perf.c
index 1b3fc8e..1659029 100644
--- a/tools/perf/perf.c
+++ b/tools/perf/perf.c
@@ -190,6 +190,12 @@ static int handle_options(const char ***argv, int *argc, int *envchanged)
break;
}

+ if (!strcmp(cmd, "-vv")) {
+ (*argv)[0] = "version";
+ version_verbose = 1;
+ break;
+ }
+
/*
* Check remaining flags.
*/
diff --git a/tools/perf/perf.h b/tools/perf/perf.h
index 8fec1ab..a1a9795 100644
--- a/tools/perf/perf.h
+++ b/tools/perf/perf.h
@@ -84,6 +84,7 @@ struct record_opts {
struct option;
extern const char * const *record_usage;
extern struct option *record_options;
+extern int version_verbose;

int record__parse_freq(const struct option *opt, const char *str, int unset);
#endif
--
2.7.4