Use extern in display templates - #1827
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Signed-off-by: Alejandro Hernandez Cordero <ahcorde@gmail.com>
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Signed-off-by: Alejandro Hernandez Cordero <ahcorde@gmail.com>
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Description
Declare the display base class templates (MessageFilterDisplay/RosTopicDisplay) as extern template in the 24 display headers and explicitly instantiate them once per library.
This cut display TU compile times by up to 52% and clean library builds by ~7 s.
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