The libc CMake build system¶
At the cost of verbosity, we want to keep the build system of LLVM libc as simple as possible. We also want to be highly modular with our build targets. This makes picking and choosing desired pieces a straightforward task.
Targets for entrypoints¶
Every entrypoint in LLVM-libc has its own build target. This target is listed
add_entrypoint_object rule. This rule generates a single object
file containing the implementation of the entrypoint.
Targets for redirecting entrypoints are also listed using the
add_entrypoint_object rule. However, one will have to additionally specify
REDIRECTED option with the rule.
Targets for entrypoint libraries¶
Standards like POSIX require that a libc provide certain library files like
libm.a, etc. The targets for such library files are listed in
lib directory as
add_entrypoint_library targets. An
add_entrypoint_library target takes a list of
targets and produces a static library containing the object files corresponding