1.6.8 C library API definitions for targeting a different environment

In addition to the direct and indirect semihosting dependent functions, there are a number of functions and files that might be useful when building for a different environment.

The following table shows these functions and files.

Table 1-4 Published API definitions

File or function Description
__main(), __rt_entry() Initializes the runtime environment and executes the user application
__rt_lib_init(), __rt_exit(), __rt_lib_shutdown() Initializes or finalizes the runtime library
LC_CTYPE locale Defines the character properties for the local alphabet
rt_sys.h A C header file describing all the functions whose default (semihosted) implementations use semihosting calls
rt_heap.h A C header file describing the storage management abstract data type
rt_locale.h A C header file describing the five locale category filing systems, and defining some macros that are useful for describing the contents of locale categories
rt_misc.h A C header file describing miscellaneous unrelated public interfaces to the C library
rt_memory.s An empty, but commented, prototype implementation of the memory model

If you are re-implementing a function that exists in the standard ARM® library, the linker uses an object or library from your project rather than the standard ARM library.

CAUTION:

Do not replace or delete libraries supplied by ARM. You must not overwrite the supplied library files. Place your re-implemented functions in separate object files or libraries instead.
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