This changes the buildlink3.mk files to use an include guard for the
recursive include. The use of BUILDLINK_DEPTH, BUILDLINK_DEPENDS,
BUILDLINK_PACKAGES and BUILDLINK_ORDER is handled by a single new
variable BUILDLINK_TREE. Each buildlink3.mk file adds a pair of
enter/exit marker, which can be used to reconstruct the tree and
to determine first level includes. Avoiding := for large variables
(BUILDLINK_ORDER) speeds up parse time as += has linear complexity.
The include guard reduces system time by avoiding reading files over and
over again. For complex packages this reduces both %user and %sys time to
half of the former time.
and add a new helper target and script, "show-buildlink3", that outputs
a listing of the buildlink3.mk files included as well as the depth at
which they are included.
For example, "make show-buildlink3" in fonts/Xft2 displays:
zlib
fontconfig
iconv
zlib
freetype2
expat
freetype2
Xrender
renderproto
as portaudio version 19), a portable cross-platform Audio API.
PortAudio is a free, cross platform, open-source, audio I/O library. It
lets you write simple audio programs in 'C' that will compile and run on
many platforms including Windows, Macintosh (8,9,X), Unix (OSS), SGI, and
BeOS. PortAudio is intended to promote the exchange of audio synthesis
software between developers on different platforms, and was recently
selected as the audio component of a larger PortMusic project that includes
MIDI and sound file support.
PortAudio provides a very simple API for recording and/or playing sound
using a simple callback function. Example programs are included that
synthesize sine waves and pink noise, perform fuzz distortion on a guitar,
list available audio devices, etc.
