2 Commits

Author	SHA1	Message	Date
Brad King	9f5c2040bf	AIX: Explicitly compute executable exports for both XL and GNU ... On AIX, symbols in executables must be exported in order to be visible to modules (plugins) they load via `dlopen`. Prior to policy `CMP0065`, CMake linked all executables with flags to export symbols, but the NEW behavior for that policy is to do so only for executables that have the `ENABLE_EXPORTS` target property set. In both cases, CMake has always used the AIX linker option `-bexpall` option to export symbols from executables. This has worked fairly well with the XL compiler, but with the GNU compiler it works only for C ABI symbols. The reason is that `-bexpall` does not export symbols starting in `_` but the GNU C++ ABI mangles all symbols with a leading `_`. Therefore we have only supported C ABI plugins with the GNU compiler on AIX. Some projects have tried to work around this by replacing `-bexpall` with `-bexpfull`, but the latter often exports symbols that we do not want exported. Avoid using `-bexpall` for executables by instead using by our own internal `ExportImportList` script to compute symbol export lists from the object files to be linked into an executable. Pass the explicitly computed export list to the AIX linker's `-bE:...` option. We already do this for shared object exports. Issue: #19163	2019-07-15 13:27:16 -04:00
Chuck Atkins	9784af1b50	CMP0065: Restrict the use of CMAKE_SHARED_LIBRARY_LINK_<LANG>_FLAGS ... This new policy restricts the addition of the shared library link flags to executables only when the ENABLE_EXPORTS property is set to True.	2015-09-21 10:12:13 -04:00