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Before the block used to apply to the set of prerequisites before the last
`:`. This turned out to be counterintuitive and not very useful since
prerequisite-specific variables are a lot less common than target specific.
And it doesn't fit with ad hoc recipes.
The new rule is if the chain ends with `:`, then the block applies to the last
set of prerequisites. Otherwise, it applies to the last set of targets. For
example:
./: exe{test}: cxx{main}
{
test = true # Applies to the exe{test} target.
}
./: exe{test}: libue{test}:
{
bin.whole = false # Applies to the libue{test} prerequisite.
}
This is actually consistent with both non-chain and non-block cases.
Consider:
exe{test}: cxx{main}
{
test = true
}
exe{test}: libue{test}:
{
bin.whole = false
}
exe{test}: libue{test}: bin.whole = false
The only exception we now have in this overall approach of "if the
dependency declaration ends with a colon, then what follows is for a
prerequisite" is for the first semicolon:
exe{test}:
{
test = true
}
exe{test}: test = true
But that's probably intuitive enough since there cannot be a prerequisite
without a target.
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Use this information to omit ad hoc C++ recipe tests is testing statically-
linked build system.
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We are reusing the buildspec syntax for that.
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Also deduce the recipe name.
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This will allow us to deal with backward-incompatible changes to cxx_rule
interface and semantics.
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Now instead of:
./: exe{foo}
exe{foo}: cxx{*}
We can write:
./: exe{foo}: cxx{*}
Or even:
./: exe{foo}: libue{foo}: cxx{*}
This can be combined with prerequisite-specific variables (which naturally
only apply to the last set of prerequisites in the chain):
./: exe{foo}: libue{foo}: bin.whole = false
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