[Buildroot] [RFC PATCH 0/4] add BCC and bpftrace packages

[Qais Yousef <qais.yousef@arm.com>]

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The following series adds 2 new packages:

	* BPF Compiler Collection (BCC)
	* bpftrace

It is based on 2020.08 tag. Can rebase on tip of master after this initial RFC
review.

The support was validated on x86_64 and aarch64 (little endian). Hence
restricted to these 2 archs only. aarch64 big endian is set as valid, but when
I tried to compile that I think LLVM or clang support for aarch64_be + BPF was
generating some errors; or something else was missing. So it might be a better
idea to remove BR2_aarch64_be from Config.in dependency.

I tried to enable i386 and arm (aarch32); but I encountered some issues and
decided to narrow the initial support to what I got working in hope that other
archs support can follow through later if people are interested.

IIRC the issues were:

	* bpftrace doesn't support these 2 archs.
	* BCC had some build failures on arm.
	* BCC had runtime issues on i386.

Marking this as RFC as it is something that was done over several weekends and
my last contribution to buildroot was many many years ago. So I am sure there
are many rough edges to tackle. Beside from my vague description above, you
might have gotten the hint it's been a while since I last touched it. But I'd
like to get the support merged, so hopefully starting a discussion with what
I have now is a better start.

Qais Yousef (4):
  llvm: Add BPF backend
  Add BPF Compiler Collection (BCC) Package
  Add bpftrace package
  clang: Fix undefined reference to dladdr error

 package/Config.in                             |  2 ++
 package/bcc/0001-fix-dlinfo.patch             | 17 ++++++++++
 .../0002-fix-undefined-gzgets-runtime.patch   | 15 ++++++++
 .../0003-fix-loading-libc-python-perf.patch   | 17 ++++++++++
 .../0004-fix-loading-librt-python-init.patch  | 17 ++++++++++
 .../0005-fix-python-installation-path.patch   | 15 ++++++++
 package/bcc/Config.in                         | 34 +++++++++++++++++++
 package/bcc/bcc.mk                            | 25 ++++++++++++++
 .../0001-fix-no-sys-auxv-header.patch         | 22 ++++++++++++
 ...02-fix-missing-def-ADDR_NO_RANDOMIZE.patch | 13 +++++++
 package/bpftrace/0003-install-libparser.patch | 12 +++++++
 .../bpftrace/0004-install-libresources.patch  | 12 +++++++
 package/bpftrace/0005-install-libarch.patch   | 10 ++++++
 package/bpftrace/0006-install-libast.patch    | 11 ++++++
 package/bpftrace/Config.in                    | 27 +++++++++++++++
 package/bpftrace/bpftrace.mk                  | 17 ++++++++++
 ...01-fix-undefined-reference-to-dladdr.patch | 13 +++++++
 package/llvm/Config.in                        |  6 ++++
 package/llvm/llvm.mk                          |  5 +++
 19 files changed, 290 insertions(+)
 create mode 100644 package/bcc/0001-fix-dlinfo.patch
 create mode 100644 package/bcc/0002-fix-undefined-gzgets-runtime.patch
 create mode 100644 package/bcc/0003-fix-loading-libc-python-perf.patch
 create mode 100644 package/bcc/0004-fix-loading-librt-python-init.patch
 create mode 100644 package/bcc/0005-fix-python-installation-path.patch
 create mode 100644 package/bcc/Config.in
 create mode 100644 package/bcc/bcc.mk
 create mode 100644 package/bpftrace/0001-fix-no-sys-auxv-header.patch
 create mode 100644 package/bpftrace/0002-fix-missing-def-ADDR_NO_RANDOMIZE.patch
 create mode 100644 package/bpftrace/0003-install-libparser.patch
 create mode 100644 package/bpftrace/0004-install-libresources.patch
 create mode 100644 package/bpftrace/0005-install-libarch.patch
 create mode 100644 package/bpftrace/0006-install-libast.patch
 create mode 100644 package/bpftrace/Config.in
 create mode 100644 package/bpftrace/bpftrace.mk
 create mode 100644 package/clang/0001-fix-undefined-reference-to-dladdr.patch

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2.17.1