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In particular, this can be used to make sure no other recipe is being
executed in parallel with the caller.
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This option has the effect of loading all the subdirectory buildfiles that
are not explicitly included.
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This is used by bpkg to detect forwarded configurations without incurring
the full context creation overhead.
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Similar to line continuations, that would make directory paths on Windows
unusable, for example:
b info(C:\myproj\)
Note that while this is less of a problem in command line variable overrides,
we disable it there for consistency.
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Line continuations would make directory paths on Windows unusable, for
example:
b C:\myproj\
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Also make effective escaping in buildspec and command line variable overrides
consistent with double-quoted strings.
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We used to backlink ad hoc group members both via the group and as individual
members. And for explicit groups it was done only via individual members,
which means it only works correctly if every member is individually updated.
Now both types of groups are backlinked from the group target.
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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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We have patterns only for the public variables pool.
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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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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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This value signals any special mode the build system may be running
in. The two core modes are `no-external-modules` (bootstrapping of
external modules is disabled) and `normal` (normal build system
execution). Build system drivers may invent additional modes (for
example, the bpkg `skeleton` mode that is used to evaluate depends
clauses).
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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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The implemented solution entails shadowing old phase queues so that helpers
don't pick up old phase tasks and boosting the max_threads count so that we
can create more helpers if all the existing ones are stuck in the old phase.
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This turned out to be important when building in multiple contexts that share
the scheduler (e.g., main and module/recipe build context). In this case we
need an accurate active thread count in order to decide when to start an extra
helper thread past max_active.
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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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Specifically, now config.<tool> (like config.cli) is handled by the import
machinery (it is like a shorter alias for config.import.<tool>.<tool>.exe
that we already had). And the cli module now uses that instead of custom
logic.
This also adds support for uniform tool metadata extraction that is handled by
the import machinery. As a result, a tool that follows the "build2 way" can be
imported with metadata by the buildfile and/or corresponding module without
any tool-specific code or brittleness associated with parsing --version or
similar outputs. See the cli tool/module for details.
Finally, two new flavors of the import directive are now supported: import!
triggers immediate importation skipping any rule-specific logic while import?
is optional import (analogous to using?). Note that optional import is always
immediate. There is also the import-specific metadata attribute which can be
specified for these two import flavors in order to trigger metadata
importation. For example:
import? [metadata] cli = cli%exe{cli}
if ($cli != [null])
info "cli version $($cli:cli.version)"
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