For every added Trackview/Mixerstrip, Ardour looks up GUI properties which
results in a total of 13 calls for the initial default items per track:
("height", "visible", "layer-display", "strip-width")
Since the tracks don't yet exist, the properties don't either.
Every lookup result in iterating over all all XMLNotes and for every
"Object". ->property ("id") and ->value () allocates memory.
Adding 64 tracks to an empty session results in 528293 string
allocations and deallocations in XMLNode::property() taking ~30%
of the track creation time.
This commit XMLnode's const method to prevent memory allocation
and caches a pointer to the XMLNode* to skip iterating over object
state.
To compile Ardour with LLVM/clang, do the usual thing but set the CXX and CC
environment variables, e.g.:
CC=/usr/bin/clang CXX=/usr/bin/clang++ ./waf configure build
git-svn-id: svn://localhost/ardour2/branches/3.0@12418 d708f5d6-7413-0410-9779-e7cbd77b26cf
