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ce0b983216
Options specified via `COMPILE_OPTIONS` and `INTERFACE_COMPILE_OPTIONS`
are deduplicated, but individual options can legitimately be duplicated
when grouped with other options, e.g.
-D A -D B
After deduplication that becomes `-D A B`. Therefore we need a way to
treat groups of options as units during deduplication. A simple approach
is to specify each group as one option, e.g.
"-D A" "-D B"
However, that conflicts with options that legitimately have spaces. To
break this ambiguity, add a `SHELL:` prefix syntax to specify that an
option should be parsed like shell command line arguments after
deduplication, e.g.
"SHELL:-D A" "SHELL:-D B"
These will survive deduplication intact, and then be parsed to produce
`-D A -D B` on the final command line.
Fixes: #15826
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43 lines
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target_compile_options
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----------------------
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Add compile options to a target.
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::
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target_compile_options(<target> [BEFORE]
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<INTERFACE|PUBLIC|PRIVATE> [items1...]
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[<INTERFACE|PUBLIC|PRIVATE> [items2...] ...])
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Specify compile options to use when compiling a given target. The
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named ``<target>`` must have been created by a command such as
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:command:`add_executable` or :command:`add_library` and must not be an
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:ref:`ALIAS target <Alias Targets>`.
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If ``BEFORE`` is specified, the content will be prepended to the property
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instead of being appended.
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This command can be used to add any options, but
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alternative commands exist to add preprocessor definitions
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(:command:`target_compile_definitions` and :command:`add_definitions`) or
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include directories (:command:`target_include_directories` and
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:command:`include_directories`). See documentation of the
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:prop_dir:`directory <COMPILE_OPTIONS>` and
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:prop_tgt:`target <COMPILE_OPTIONS>` ``COMPILE_OPTIONS`` properties.
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The ``INTERFACE``, ``PUBLIC`` and ``PRIVATE`` keywords are required to
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specify the scope of the following arguments. ``PRIVATE`` and ``PUBLIC``
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items will populate the :prop_tgt:`COMPILE_OPTIONS` property of
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``<target>``. ``PUBLIC`` and ``INTERFACE`` items will populate the
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:prop_tgt:`INTERFACE_COMPILE_OPTIONS` property of ``<target>``.
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(:ref:`IMPORTED targets <Imported Targets>` only support ``INTERFACE`` items.)
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The following arguments specify compile options. Repeated calls for the same
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``<target>`` append items in the order called.
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Arguments to ``target_compile_options`` may use "generator expressions"
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with the syntax ``$<...>``. See the :manual:`cmake-generator-expressions(7)`
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manual for available expressions. See the :manual:`cmake-buildsystem(7)`
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manual for more on defining buildsystem properties.
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.. include:: COMPILE_OPTIONS_SHELL.txt
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