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We've long created shared objects on AIX using the linker's `-G` option (also offered by the XL front-end). The `-G` option implies `-brtl` and enables runtime linking. This has been largely unnecessary because we provide all dependencies on the link line and both XL and GNU compilers offer builtin behavior to export symbols. Since commit0f150b69d3(AIX: Explicitly compute shared object exports for both XL and GNU, 2019-07-11) we compute exports explicitly and consistently. Therefore runtime linking is no longer necessary for shared objects. We've also long created executables on AIX using the linker's `-brtl` option to enable runtime linking in case they load plugins at runtime. Since commit9f5c2040bf(AIX: Explicitly compute executable exports for both XL and GNU, 2019-07-12) and commit2fa920c0cd(AIX: Create import library for executables with exports, 2019-07-16) we now provide the linker enough information to fully resolve symbols in plugins up front. Therefore runtime linking is no longer necessary for executables. Drop use of `-G` for creating shared objects and use the XL `-qmkshrobj` and GCC `-shared` options instead. Both invoke the linker with the `-bM:SRE -bnoentry` options to create a shared object without runtime linking enabled. Also drop use of `-brtl` for creating executables. Issue: #19163
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1.0 KiB
ReStructuredText
21 lines
1.0 KiB
ReStructuredText
aix
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---
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* On AIX, executables using the :prop_tgt:`ENABLE_EXPORTS` target property
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now produce a linker import file with a ``.imp`` extension in addition
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to the executable file. Plugins (created via :command:`add_library` with
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the ``MODULE`` option) that use :command:`target_link_libraries` to link
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to the executable for its symbols are now linked using the import file.
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The :command:`install(TARGETS)` command now installs the import file as
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an ``ARCHIVE`` artifact.
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* On AIX, runtime linking is no longer enabled by default. CMake provides
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the linker enough information to resolve all symbols up front.
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One may manually enable runtime linking for shared libraries and/or
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loadable modules by adding ``-Wl,-G`` to their link flags
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(e.g. in the :variable:`CMAKE_SHARED_LINKER_FLAGS` or
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:variable:`CMAKE_MODULE_LINKER_FLAGS` variable).
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One may manually enable runtime linking for executables by adding
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``-Wl,-brtl`` to their link flags (e.g. in the
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:variable:`CMAKE_EXE_LINKER_FLAGS` variable).
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