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由 Claudio Bley 提交于
library (Claudio Bley): Introduced a PNG_LIB_TARGETS variable that lists all activated library targets. It is an error if this variable ends up empty, ie. you have to build at least one library variant. Made the *_COPY targets only depend on library targets actually being build. Use PNG_LIB_TARGETS to unify a code path. Changed the CREATE_SYMLINK macro to expact the full path to a file as the first argument. When symlinking the filename component of that path is determined and used as the link target. Use copy_if_different in the CREATE_SYMLINK macro.
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