waf/ChangeLog

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NEW IN WAF 1.9
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* General enhancements:
- Add the tool 'nobuild.py'
- Remove qt4 and kde4 from the default modules
- Have Clang detected first on many platforms, in particular on FreeBSD #1528
- Remove Node.cache_sig and Node.sig so that dependencies are on file contents #1580
- Change cflags in the beginning / cppflags at the end #1505
- Merge ${FOO}${BAR} flags in commands executed without a shell (no space added)
- Interpret empty command-line defines as integer values #1704
- Waf tools are not cached on "waf configure" by default anymore; pass conf.load(.., cache=True)
* Performance highlights:
- Reduce the key size in bld.task_sigs by adding bld.node_sigs and bld.imp_sigs
- Remove __hash__ and __eq__ from Node and Task #1629
- Make lazy visual studio detection the default
- Remove the uses of run_once that creates unfree-able memory
- Enable a consistent progress bar output #1641
- Reduce the memory footprint of Task objects, up to 50% memory reduction on large builds
- Enabled pre-forked builds by default to achieve faster builds, up to 2x speedup on short-lived processes
* API changes:
- Remove the duplicate split functions from Utils
- Remove the command called "update"
- Add Task.get_cwd()
- Remove Utils.nogc
- Modify Utils.run_once so that it accepts a list of *args
- Improve the task consumer in Runner.py
- Use relative paths in apply_incpaths by default (and absolute ones when paths cross drives)