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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
12 lines
261 B
CMake
12 lines
261 B
CMake
include(RunCMake)
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run_cmake(OLDBad1)
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if(NOT CMAKE_SYSTEM_NAME STREQUAL "AIX")
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# Tests with ENABLE_EXPORTS ON. For AIX we do not use the flags at all.
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run_cmake(OLDBad2)
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run_cmake(NEWBad)
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endif()
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run_cmake(NEWGood)
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run_cmake(WARN-OFF)
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run_cmake(WARN-ON)
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