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This patch does two things:
1. it broadens the interface for the compiler module so that
non-first-file modules can possibly be parallelized. This is done by
dynamically switching on `[ListOfFiles]`, which remains sequential as
before, or `{[SeqPriority], [Parallel]}`, which divides regular files
between higher priority ones and those that can be in parallel
2. implements this mechanism in the rebar compiler, based on the erl
file digraph. If a file has an in-neighbour, it is depended on by
another file. The mechanism therefore makes it so all files that have
dependants get compiled in their strict relative sequential order
first, and then the undepended-on files get compiled together in
parallel.
By running:
./rebar3 ct --suite test/rebar_compile_SUITE.erl --case \
recompile_when_parse_transform_inline_changes --repeat 50
the previous iteration of this would rapidly fail, and this one succeeds
every time.
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When the commit at
https://github.com/erlang/rebar3/commit/8c4a74a3ed9ddd9841e6596ca86b81f3d43906c0
introduced a recursive search for build elements, it accidentally did so
using a function that accepts a regex for its match.
In doing so, if a behaviour or include had a name such as
`common_prefix` and that multiple other modules used the name
`common_prefix_<rest_of_name>`, all the other files would be seen as
dependencies to be checked in a directed graph.
This resulted in continuous re-checking of files that kept depending on
each others and blew the compile time up exponentially.
By using a delimitation on the regex (^<modulename>$), the build comes
back down to finding only the right files and becomes fast again.
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* add compile type for dynamic project compilation
* new rebar_compiler abstraction for running multiple compilers
rebar_compiler is a new behaviour that a plugin can implement to
be called on any ues of the compile provider to compile source
files and keep track of their dependencies.
* fix check that modules in .app modules list are from src_dirs
* use project_type to find module for building projects
* allow plugins to add project builders and compilers
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