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On AIX, plugins meant to be loaded into executables via `dlopen` must be linked with access to a list of symbols exported from the executable in order to use them (when not using runtime linking). The AIX linker supports specifying this list as an "import file" passed on the command line either via the `-bI:...` option or (with a leading `#! .` line) as a normal input file like any other library file. The linker import file plays the same role on AIX as import libraries do on Windows. Teach CMake to enable its import library abstraction on AIX for executables with the `ENABLE_EXPORTS` target property set. Teach our internal `ExportImportList` script to optionally generate a leading `#! .` line at the top of the generated export/import list. Update our rule for linking an executable with exports to generate a public-facing "import library" implemented as an AIX linker import file. With this approach, our existing infrastructure for handling import libraries on Windows will now work for AIX linker import files too: * Plugins that link to their executable's symbols will be automatically linked using the import file on the command line. * The executable's import file will be (optionally) installed and exported for use in linking externally-built plugins. This will allow executables and their plugins to build even if we later turn off runtime linking. Issue: #19163
34 lines
1.4 KiB
CMake
34 lines
1.4 KiB
CMake
set(CMAKE_SHARED_LIBRARY_PREFIX "lib") # lib
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set(CMAKE_SHARED_LIBRARY_SUFFIX ".so") # .so
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set(CMAKE_AIX_IMPORT_FILE_PREFIX "")
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set(CMAKE_AIX_IMPORT_FILE_SUFFIX ".imp")
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set(CMAKE_DL_LIBS "-lld")
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# RPATH support on AIX is called libpath. By default the runtime
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# libpath is paths specified by -L followed by /usr/lib and /lib. In
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# order to prevent the -L paths from being used we must force use of
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# -Wl,-blibpath:/usr/lib:/lib whether RPATH support is on or not.
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# When our own RPATH is to be added it may be inserted before the
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# "always" paths.
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if(NOT DEFINED CMAKE_PLATFORM_REQUIRED_RUNTIME_PATH)
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set(CMAKE_PLATFORM_REQUIRED_RUNTIME_PATH /usr/lib /lib)
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endif()
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# Files named "libfoo.a" may actually be shared libraries.
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set_property(GLOBAL PROPERTY TARGET_ARCHIVES_MAY_BE_SHARED_LIBS 1)
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# since .a can be a static or shared library on AIX, we can not do this.
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# at some point if we wanted it, we would have to figure out if a .a is
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# static or shared, then we could add this back:
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# Initialize C link type selection flags. These flags are used when
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# building a shared library, shared module, or executable that links
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# to other libraries to select whether to use the static or shared
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# versions of the libraries.
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#foreach(type SHARED_LIBRARY SHARED_MODULE EXE)
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# set(CMAKE_${type}_LINK_STATIC_C_FLAGS "-bstatic")
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# set(CMAKE_${type}_LINK_DYNAMIC_C_FLAGS "-bdynamic")
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#endforeach()
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include(Platform/UnixPaths)
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