44 lines
1.7 KiB
ReStructuredText
44 lines
1.7 KiB
ReStructuredText
LLVM libc build rules
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=====================
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At the cost of verbosity, we want to keep the build system of LLVM libc
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as simple as possible. We also want to be highly modular with our build
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targets. This makes picking and choosing desired pieces a straighforward
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task.
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Targets for entrypoints
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-----------------------
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Every entrypoint in LLVM-libc has its own build target. This target is listed
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using the ``add_entrypoint_object`` rule. This rule generates a single object
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file containing the implementation of the entrypoint.
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Targets for redirecting entrypoints are also listed using the
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``add_entrypoint_object`` rule. However, one will have to additionally specify
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the ``REDIRECTED`` option with the rule.
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Targets for entrypoint libraries
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--------------------------------
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Standards like POSIX require that a libc provide certain library files like
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``libc.a``, ``libm.a``, etc. The targets for such library files are listed in
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the ``lib`` directory as ``add_entrypoint_library`` targets. An
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``add_entrypoint_library`` target takes a list of ``add_entrypoint_object``
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targets and produces a static library containing the object files corresponding
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to the ``add_entrypoint_targets``.
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Targets for redirectors
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-----------------------
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Similar to how every entrypoint in LLVM-libc has its own build target, every
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redirector function also has its own build target. This target is listed using
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the ``add_redirector_object`` rule. This rule generates a single object file
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which can be packaged along with other redirector objects into shared library
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of redirectors (see below).
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Targets for library of redirectors
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----------------------------------
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Targets for shared libraries of redirectors are listed using the
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``add_redirector_library`` rule.
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