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On Windows, we don't export anything from a DLL without an explicit export as specified in the def file. On Linux (or other ELF system), we export everything by default. For reasons given in http://gcc.gnu.org/wiki/Visibility we should make Linux work like Windows here, and use the def file (or something like it) to set the exports as well. (Mainly this helps to reduce ABI surface, but it also helps with performance as well.)
Bugzilla is no longer used for tracking libtiff issues. Remaining open tickets, such as this one, have been migrated to the libtiff GitLab instance at https://gitlab.com/libtiff/libtiff/issues . The migrated tickets have their summary prefixed with [BZ#XXXX] where XXXX is the initial Bugzilla issue number.
