Export only YAML_CPP_API-tagged symbols on Linux. #644
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This marks classes tagged with YAML_CPP_API with visibility("default"), to
explicitly export them, and then makes the defalt visibility "hidden" via
-fvisibility=hidden.
This reduces the number of exported symbols by more than 50%, which has
a small application start-up time and memory useage benefit. It also
makes it more feasible to audit the set of exported symbols in automated
ABI compatibility systems.
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In addition to running the unit-tests I've also built all of the packages in Ubuntu which depend on yaml-cpp against the it. All of them (at least the ones which don't fail for other reasons, like not using C++11) build fine against this, so those symbols are really unused. |
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@RAOF For Windows the classes shouldn't be tagged with YAML_CPP_API but the public methods. Will that conflict with Linux in any way? |
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#958 seems related and especially I think letting cmake handle this is good idea. #958 (comment) |
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Mark classes tagged with YAML_CPP_API with visibility("default"), to explicitly export them, and then hide everything else via
-fvisibility=hidden.This reduces the number of exported symbols by more than 50%, which has a small application start-up time and memory useage benefit. It also makes it more feasible to audit the set of exported symbols in automated ABI compatibility systems.