53 lines
2 KiB
Markdown
53 lines
2 KiB
Markdown
### nenolod's buildsys fork
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This is a custom version of [buildsys] (http://github.com/Midar/buildsys), designed for
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massively parallel builds. The differences between official buildsys and this buildsys
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are:
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* A large amount of shell has been replaced with gmake builtin rule generation features.
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* You can use V=1 to get CFLAGS and LDFLAGS passed to commands.
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* Multiple `SUBDIRS` may be compiled in parallel. This ensures that there are no stalls
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in the build process on multi-core boxes. If there is anything to build, we will be
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building it.
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* Dependency generation is on a per-sourceunit basis and done entirely in parallel, including
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across multiple `SUBDIRS`. This speeds up builds by allowing dependency generation to
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already be completed when you get deeper in the source tree.
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* The messages produced by the buildsystem have been changed so that V=1 output doesn't
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look strange.
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Other than that, it is mostly compatible with official buildsys at an "API level."
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In terms of performance increase, on stock buildsys, make -j4 takes around 50 seconds
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to build audacious-plugins. On this fork, the build time is cut down to around 20
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seconds. That's a pretty big increase.
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### Possible problems / FAQ
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#### I am getting notices about missing libraries that should be built already!
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The way we parallelize SUBDIRS is by converting each SUBDIR into a make task. If a specific
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SUBDIR depends on another SUBDIR, you should denote it like so:
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```Make
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SUBDIRS = subdir1 subdir2 subdir3 subdir4
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# subdir2 depends on subdir1
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subdir2: subdir1
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# subdir3 depends on both subdir1 and subdir4
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subdir3: subdir2 subdir4
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```
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This results in subdir1 and subdir4 being built first, then subdir2 and subdir3
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respectively.
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#### It won't build my SUBDIRS.
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Put your SUBDIRS before your include lines. You really are supposed to do this in
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buildsys *anyway*, but for some reason it sometimes lets you put it after the fact.
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My fork does not let you do that as SUBDIRS are turned into make tasks.
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