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Implement feature relevance.

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* New feature <relevant> which is automatically deduced in most cases.
* Features which are not relevant do not affect target paths and
  do not prevent merging of virtual targets.
* generators.jam: generator.run always returns usage-requirements
  to allow usage-requirements in non-top-level generators.  This
  is necessary because we're using usage-requirements to track
  relevance from flags.
* New rule toolset.uses-features to specify features that the rule
  checks manually, instead of using toolset.flags.  In the future,
  we should consider restricting the properties actually passed,
  to detect errors.
* Adjust tests to handle the new paths (verified by inspection).
* Add temporary option --ignore-relevance to consider all features relevant
  to aid migration.
* New rule property.evaluate-conditional-relevance which helps tracking
  relevance in <conditional>.
* Widely scattered changes to use the new interfaces.
This commit is contained in:
Steven Watanabe
2018-01-13 09:13:49 -07:00
parent ae4e151967
commit ee613a6a28
50 changed files with 674 additions and 122 deletions
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4
src/tools/python.jam
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@@ -1243,6 +1243,10 @@ local rule pyd-pythonpath ( source )
toolset.flags python.capture-output ARGS <testing.arg> ;
toolset.flags python.capture-output INPUT_FILES <testing.input-file> ;
toolset.uses-features python.capture-output :
<testing.launcher> <testing.execute> <dll-path> <xdll-path> <target-os>
<pythonpath> ;
rule capture-output ( target : sources * : properties * )
{
# Setup up a proper DLL search path. Here, $(sources[1]) is a python module