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docs: Explain how to build only .dyn_o. #10984

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7 changes: 7 additions & 0 deletions doc/cabal-project-description-file.rst
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Expand Up @@ -1188,6 +1188,13 @@ Dynamic linking options
Build shared library. This implies a separate compiler run to
generate position independent code as required on most platforms.

``--enable-shared`` is enabled automatically if GHC is dynamically linked
(see ``ghc --info``'s ``GHC Dynamic`` field)
or you request to build dynamic executables.

If you want to build *only* dynamic object files,
you also have to pass ``--disable-library-vanilla``.

The command line variant of this flag is ``--enable-shared`` and
``--disable-shared``.

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8 changes: 6 additions & 2 deletions doc/setup-commands.rst
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Expand Up @@ -807,8 +807,12 @@ Miscellaneous options
Build shared library. This implies a separate compiler run to
generate position independent code as required on most platforms.

``--enable-shared`` is enabled automatically if GHC is dynamically linked or
you request to build dynamic executables.
``--enable-shared`` is enabled automatically if GHC is dynamically linked
(see ``ghc --info``'s ``GHC Dynamic`` field)
or you request to build dynamic executables.

If you want to build *only* dynamic object files,
you also have to pass ``--disable-library-vanilla``.

.. option:: --disable-shared

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