This should make the coming diffs easier to read.

This reverts commit cf3f8205c4.

It was a good initiative, but waf 2.0 introces backward incompatible
changes that break the pkg-config checks. The config checks will be
updated before migrating to waf 2.0.

With this patch it is possibly to start the JACK daemon with a systemd
service file of type notify. The following provides an example service
file:

[Service]
Type=notify
ExecStart=/usr/bin/jackd -d alsa

[Install]
WantedBy=multi-user.target

Signed-off-by: Timo Wischer <twischer@de.adit-jv.com>

The ucontext functionality is not available on all CPUs with all C
libraries. Instead of making just assumptions based on the CPU
architecture, this commit adds the necessary checks in wscript to verify
the availability of the ucontext functionality, before using it in
dbus/sigsegv.c.

This avoids the long list of architecture exclusions, and make it more
robust when building jack2 for new CPU architectures.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

In some C-libraries (like uclibc), backtrace support is optional, so the
execinfo.h may not exist.

This change adds the check for execinfo.h header and conditionaly enable
backtrace support.

This issue has been triggered by Buildroot farms:
  http://autobuild.buildroot.org/results/391/391e71a988250ea66ec4dbee6f60fdce9eaf2766/build-end.log

Signed-off-by: Samuel Martin <s.martin49@gmail.com>

This makes sure header checks work when the third party package is
installed in a non-standard location, as long as a pkg-config file is
found.

look prettier

use the header)

(fixes builds with nonstandard out directory)

The mmsystem.h header check didn't include windows.h so check fails even though mmsystem.h was present.