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2020-04-27Rework tool importation along with cli moduleBoris Kolpackov1-3/+60
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)"
2020-03-20Add ability to query whether target has been matched for actionBoris Kolpackov1-3/+9
2020-03-17Rename all find*(variable) to lookup*(variable)Boris Kolpackov1-22/+26
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.
2020-02-07Drop copyright notice from source codeKaren Arutyunov1-1/+0
2019-10-29Add forward declaration header for build state typesBoris Kolpackov1-3/+1
2019-10-02Allow iterating over group prerequisites during executeBoris Kolpackov1-0/+3
2019-09-04Add support for native shared library versioning on LinuxBoris Kolpackov1-3/+7
Now we can do: lib{foo}: bin.lib.version = linux@1.2 And end up with libfoo.so.1.2 libfoo.so.1 -> libfoo.so.1.2
2019-08-26Implement updating build system modulesBoris Kolpackov1-0/+4
2019-08-23Introduce notion of build contextBoris Kolpackov1-28/+65
All non-const global state is now in class context and we can now have multiple independent builds going on at the same time.
2019-08-21Cleanup context.hxx and its usageBoris Kolpackov1-5/+1
2019-08-01Fix linkage failure due to inline functions defined in ↵Karen Arutyunov1-5/+8
libbuild2/algorithm.ixx and referred from libbuild2/target.txx
2019-07-01Split build system into library and driverBoris Kolpackov1-0/+1817