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Unlike normal and ad hoc prerequisites, a post hoc prerequisite is built
after the target, not before. It may also form a dependency cycle together
with normal/ad hoc prerequisites. In other words, all this form of dependency
guarantees is that a post hoc prerequisite will be built if its dependent
target is built.
See the NEWS file for details and an example.
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Now unqualified variables are project-private and can be typified.
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Note that the unmatch (match but do not update) and match (update during
match) values are only supported by certain rules (and potentially only for
certain prerequisite types).
Additionally:
- All operation-specific variables are now checked for false as an override
for the prerequisite-specific include value. In particular, this can now be
used to disable a prerequisite for update, for example:
./: exe{test}: update = false
- The cc::link_rule now supports the update=match value for headers and ad hoc
prerequisites. In particular, this can be used to make sure all the library
headers are updated before matching any of its (or dependent's) object
files.
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Our current semantics is to clean any prerequisites that are in the same
project (root scope) as the target and it may seem more natural to rather only
clean prerequisites that are in the same base scope. While it's often true for
simple projects, in more complex cases it's not unusual to have common
intermediate build results (object files, utility libraries, etc) reside in
the parent and/or sibling directories. With such arrangements, cleaning only
in base (even from the project root) may leave such intermediate build results
laying around (since there is no reason to list them as prerequisites of any
directory aliases). So we clean in the root scope by default but now any
target-prerequisite relationship can be marked not to trigger a clean with the
clean=false prerequisite-specific value.
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The new config.export variable specifies the alternative file to write the
configuration to as part of the configure meta-operation. For example:
$ b configure: proj/ config.export=proj-config.build
The config.export value "applies" only to the projects on whose root scope it
is specified or if it is a global override (the latter is a bit iffy but we
allow it, for example, to dump everything to stdout). This means that in order
to save a subproject's configuration we will have to use a scope-specific
override (since the default will apply to the outermost amalgamation). For
example:
$ b configure: subproj/ subproj/config.export=.../subproj-config.build
This could be somewhat unnatural but then it will be the amalgamation whose
configuration we normally want to export.
The new config.import variable specifies additional configuration files to be
loaded after the project's default config.build, if any. For example:
$ b create: cfg/,cc config.import=my-config.build
Similar to config.export, the config.import value "applies" only to the
project on whose root scope it is specified or if it is a global override.
This allows the use of the standard override "positioning" machinery (i.e.,
where the override applies) to decide where the extra configuration files are
loaded. The resulting semantics is quite natural and consistent with command
line variable overrides, for example:
$ b config.import=.../config.build # outermost amalgamation
$ b ./config.import=.../config.build # this project
$ b !config.import=.../config.build # every project
Both config.export and config.import recognize the special `-` file name as an
instruction to write/read to/from stdout/stdin, respectively. For example:
$ b configure: src-prj/ config.export=- | b configure: dst-prj/ config.import=-
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All non-const global state is now in class context and we can now have
multiple independent builds going on at the same time.
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