make: TockLibrary: unconditionally set build dir #390
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This fixes an issue when multiple Tock libraries are used in the same build. With `?=`, the value is "reset" for each instantiation of TockLibrary, causing the build directory for all libraries to be set to whichever library is included last. With `:=` this does not occur.
bradjc
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This fixes an issue when multiple Tock libraries are used in the same build. With
?=, the value is "reset" for each instantiation of TockLibrary, causing the build directory for all libraries to be set to whichever library is included last. With:=this does not occur.