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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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We still always use the public var_pool from context but where required,
all access now goes through scope::var_pool().
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Note that we started with this semantics but it was changed in a commit on
2021-09-16 for reasons not entirely unclear but most likely due to target-
specific variables specified for the group not being set on all the members.
Which we have now addressed (see the previous commit).
Note also that this new (old) semantics is not without its own drawbacks.
Specifically, there is a bit of waste when the target-specific variable is
really only meant for the recipe and thus setting it on all the members is
unnecessary. For example:
<{hxx ixx cxx}{options}>: cli{options}
{
options = ...
}
{{
# Use options.
}}
But this feels like a quality of implementation rather than conceptual
issue. For example, we could likely one day address it by synthesizing a
separate group target for ad hoc groups.
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For example, this allows a Qt moc rule not to list generated headers
from libQtCore since they are pre-generated by the library.
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In particular, we now have separate auxiliary data storage for inner
and outer operations.
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Instead of overriding this function, derived targets must now set the
dynamic_type variable to their static_type in their constructor body.
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In particular, the match() rename makes sure it doesn't clash with
rule::match() which, after removal of the hint argument in simple_rule,
has exactly the same signature, thus making it error-prone to calling
recursively.
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A rule hint is a target attribute, for example:
[rule_hint=cxx] exe{hello}: c{hello}
Rule hints can be used to resolve ambiguity when multiple rules match the same
target as well as to override an unambiguous match.
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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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Currently we may end up resetting the data during the rule ambiguity
detection.
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Explicit target{} should be used instead. Also, in this context, absent target
type is now treated as file{} rather than target{}, for consistency with all
other cases.
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An ad hoc pattern rule consists of a pattern that mimics a dependency
declaration followed by one or more recipes. For example:
exe{~'/(.*)/'}: cxx{~'/\1/'}
{{
$cxx.path -o $path($>) $path($<[0])
}}
If a pattern matches a dependency declaration of a target, then the recipe is
used to perform the corresponding operation on this target. For example, the
following dependency declaration matches the above pattern which means the
rule's recipe will be used to update this target:
exe{hello}: cxx{hello}
While the following declarations do not match the above pattern:
exe{hello}: c{hello} # Type mismatch.
exe{hello}: cxx{howdy} # Name mismatch.
On the left hand side of `:` in the pattern we can have a single target or an
ad hoc target group. The single target or the first (primary) ad hoc group
member must be a regex pattern (~). The rest of the ad hoc group members can
be patterns or substitutions (^). For example:
<exe{~'/(.*)/'} file{^'/\1.map/'}>: cxx{~'/\1/'}
{{
$cxx.path -o $path($>[0]) "-Wl,-Map=$path($>[1])" $path($<[0])
}}
On the left hand side of `:` in the pattern we have prerequisites which can
be patterns, substitutions, or non-patterns. For example:
<exe{~'/(.*)/'} file{^'/\1.map/'}>: cxx{~'/\1/'} hxx{^'/\1/'} hxx{common}
{{
$cxx.path -o $path($>[0]) "-Wl,-Map=$path($>[1])" $path($<[0])
}}
Substitutions on the left hand side of `:` and substitutions and non-patterns
on the right hand side are added to the dependency declaration. For example,
given the above rule and dependency declaration, the effective dependency is
going to be:
<exe{hello} file{hello.map>: cxx{hello} hxx{hello} hxx{common}
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Now triple dot and escape sequence can appear almost anywhere in the target
name (see target::split_name() for details).
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Failed that, they may pull headers via an ad hoc group.
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This allows separation of legal files (LICENSE, AUTHORS, etc) from other
documentation. For example:
./: ... doc{README} legal{LICENSE}
$ b install ... config.install.legal=/usr/share/licenses/hello/
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