linux-kernel - feature detection versus feature selection

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Message-ID: <20160812161500.GL27651@kernel.org>
Date:	Fri, 12 Aug 2016 13:15:00 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Jiri Olsa <jolsa@...nel.org>
Cc:	Wang Nan <wangnan0@...wei.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: feature detection versus feature selection

Hey guys,

	Now we have this output when building tools with the feature
detection mechanisms in tools/build/:

Auto-detecting system features:
...                         dwarf: [ on  ]
...            dwarf_getlocations: [ OFF ]
...                         glibc: [ on  ]
...                          gtk2: [ on  ]
...                      libaudit: [ on  ]
...                        libbfd: [ on  ]
...                        libelf: [ on  ]
...                       libnuma: [ on  ]
...        numa_num_possible_cpus: [ OFF ]
...                       libperl: [ on  ]
...                     libpython: [ on  ]
...                      libslang: [ on  ]
...                     libcrypto: [ on  ]
...                     libunwind: [ on  ]
...            libdw-dwarf-unwind: [ OFF ]
...                          zlib: [ on  ]
...                          lzma: [ on  ]
...                     get_cpuid: [ on  ]
...                           bpf: [ on  ]


	What I miss is a way to have another column that would state if
the user had used, say, NO_LIBELF to disable libelf...

	Jiri, is there already some file where we have the list of
manually disabled features? Or do you have something like that in mind?
.config files?

- Arnaldo