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Target/prerequisite-specific variable blocks can now be present even if
there are prerequisites. For example, now instead of:
exe{foo}: cxx{foo}
exe{foo}: cc.loptions += ...
Or:
exe{foo}: cxx{foo}
exe{foo}:
{
cc.loptions += ...
cc.libs += ...
}
We can write:
exe{foo}: cxx{foo}
{
cc.loptions += ...
cc.libs += ...
}
This also works with dependency chains in which case the block applies
to the set of prerequisites (note: not targets) before the last ':'. For
example:
./: exe{foo}: libue{foo}: cxx{foo}
{
bin.whole = false # Applies to the libue{foo} prerequisite.
}
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