Fixes for when using clang/llvm as CC/CXX

Enhance check for presence of static-libstdc++

* Clang does not generate code to initialize the entire union when
  initializing a nested struct. This is the case for union bpf_attr.
  As a workaround, call memset explicitly.
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

* Fixes a link error on Ubuntu when static-libstdc++ is not installed.
Reported-by: Denis V. Lunev <den@openvz.org>
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

Include missed spec files in s/bpf/bcc/ rename

Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

Rename python module name to 'bcc' from 'bpf'

* Rename python module to bcc
* Rename python-bpf (deb,rpm) package to python-bcc
* Pending this change, I will likely re-tag 0.1.6, and upload the bcc
  package to pypi.python.org
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

Update tag to v0.1.6, include finall llvm 3.7.0 release

* This script can be run by buildbot to generate the debian files
e.g.: PARALLEL=4 scripts/build-deb.sh
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

* Update llvm to 3.7.0 release
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

Add RPM packaging for el6,el7,fedora22

Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

Minor change to task_switch example syntax

initial ksym() and ksymaddr()

Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

Add beta RPM spec and docker script for centos

Testing buildbot
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

Also, testing buildbot with this tiny change
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

Add gretap support for full mesh tunnel

Signed-off-by: Wei-Chun Chao <weichunc@plumgrid.com>

Add proper debian build support, rename libbcc.so

improve examples using new features

This adds support for properly tagging the build when cmake is run not
in a git tree, which is the case when building from src-deb.
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

The cmake based build system is nice, but not quite production ready.
Move to the more painful but featureful debuild style. This is one step
towards an upstreamable package.

Rename libbpfprog (ugh) to libbcc.

Split out python-bpf and libbcc-examples into separate packages that
depend on libbcc.
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

Fix print() breakage in python 2.7 environments

Fixes: #164
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

Add debug flag to enable prints from kernel verifier

Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

Add flag to BPF() to enable debug prints from the verifier. Use by
passing 0x2 to debug= in the constructor. Add docstring for BPF
constructor.

Also, optimize bpf_prog_load so that by default the kernel is not
asked to print the verbose output. The program will be "loaded" a second
time to capture the verifier failure message.

Fixes: #147
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>

Add regex support to attach_k[ret]probe