[PATCH 0/4] Introduce perf build subcommand

[Aditya Gupta <adityag@linux.ibm.com>]

The Problem
===========

Currently the presence of a feature is checked with a combination of
perf version --build-options and greps, such as:

    perf version --build-options | grep " on .* HAVE_FEATURE"

Proposed solution
=================

As suggested by contributors in:
https://lore.kernel.org/linux-perf-users/ZMPWk5K63tadmDlU@kernel.org/

Introduce a subcommand "perf build --has", with which
scripts can test for presence of a feature, such as:

    perf build --has HAVE_FEATURE

The usage of "perf version --build-options | grep" has been replaced in two
tests, with "perf build --has" command

Also, to not duplicate the same feature list at multiple places, a new global
'supported_features' array has been introduced in builtin.h, so both commands
'perf build --has' and 'perf version --build-options' use the same array

'supported_features' feature is an array of 'struct feature_support', which
also has the name of the feature, macro used to test it's presence, and a
is_builtin member, which will be 0 if feature not built-in, and 1 if built-in

Architectures Tested
====================
* x86_64
* ppc64le

Git tree
========

Git tree with this patch series applied for testing:
https://github.com/adi-g15-ibm/linux/tree/perf-build-has

Aditya Gupta (3):
  perf build: introduce build subcommand
  perf version: update --build-options to use 'supported_features' array
  perf tests task_analyzer: check perf build for libtraceevent support

Athira Rajeev (1):
  tools/perf/tests: Update probe_vfs_getname.sh script to use perf build
    --has

 tools/perf/Build                              |  1 +
 tools/perf/builtin-build.c                    | 94 +++++++++++++++++++
 tools/perf/builtin-version.c                  | 39 ++------
 tools/perf/builtin.h                          | 47 ++++++++++
 tools/perf/perf.c                             |  1 +
 .../perf/tests/shell/lib/probe_vfs_getname.sh |  4 +-
 .../shell/record+probe_libc_inet_pton.sh      |  5 +-
 .../shell/record+script_probe_vfs_getname.sh  |  5 +-
 tools/perf/tests/shell/test_task_analyzer.sh  |  4 +-
 9 files changed, 163 insertions(+), 37 deletions(-)
 create mode 100644 tools/perf/builtin-build.c

-- 
2.41.0