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An import without a project name or with the same name as the importing
project's is now treated as importation from the same project.
For example, given the libhello project that exports the lib{hello} target, a
buildfile for an executable in the same project instead of doing something
like this:
include ../libhello/
exe{hello}: ../libhello/lib{hello}
Can now do this:
import lib = libhello%lib{hello}
Or:
import lib = lib{hello}
And then:
exe{hello}: $lib
Note that a target in project-local importation must still be exported in
the project's export stub. In other words, project-local importation goes
through the same mechanisms as normal import.
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Our new scheme is to have any "out" content in a subdirectory called build/
(build/build/ for the build system core, build/<module>/build/ for modules).
This way we can ignore them in .gitignore with a generic entry.
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While we could automatically set it if the target is imported, there is
nothing we can do if the target is used in the same project. So to avoid
confusion we make it mandatory.
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Now a project that disables amalgamation will not logically "see" an outer
project even if it's physically inside its scope.
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Specifically, now config.<tool> (like config.cli) is handled by the import
machinery (it is like a shorter alias for config.import.<tool>.<tool>.exe
that we already had). And the cli module now uses that instead of custom
logic.
This also adds support for uniform tool metadata extraction that is handled by
the import machinery. As a result, a tool that follows the "build2 way" can be
imported with metadata by the buildfile and/or corresponding module without
any tool-specific code or brittleness associated with parsing --version or
similar outputs. See the cli tool/module for details.
Finally, two new flavors of the import directive are now supported: import!
triggers immediate importation skipping any rule-specific logic while import?
is optional import (analogous to using?). Note that optional import is always
immediate. There is also the import-specific metadata attribute which can be
specified for these two import flavors in order to trigger metadata
importation. For example:
import? [metadata] cli = cli%exe{cli}
if ($cli != [null])
info "cli version $($cli:cli.version)"
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While generally a bad idea, there are valid situations where this may happen,
such as a standalone build of the tests subproject in test-installed.
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Now we consistently use term "lookup" for variable value lookup. At some
point we should also rename type lookup to binding and get rid of all the
lookup_type aliases.
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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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