X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=personalities%2Fpersonality.txt;fp=personalities%2Fpersonality.txt;h=0000000000000000000000000000000000000000;hb=a1f747e81dad0bb9897cb11c652403bb7bbf084c;hp=d5bc2badd33e79ed1816df5d8af1674462cc7d81;hpb=1d9d92ba957a0b8307c9a65c35867fde68e6533b;p=pdclib

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-/* ----------------------------------------------------------------------------
- * $Id$
- * ----------------------------------------------------------------------------
- * Public Domain C Library - http://pdclib.sourceforge.net
- * This code is Public Domain. Use, modify, and redistribute at will.
- * ----------------------------------------------------------------------------
- * Description of the personality concept
- * --------------------------------------------------------------------------*/
-
-The PDCLib is aimed at providing a fully conforming implementation of the C
-standard library (ISO/IEC 9899) for diverse environments.
-
-To faciliate adaption to new environments, platform-specific parts of the
-library have been seperated from the generic parts (e.g. the string functions,
-or the parsing of format strings in stdio.h).
-
-The generic part is found in includes/ and functions/. It should be compilable
-on any platform given a compliant compiler.
-
-The "personalized" part implements, for each supported environment, the non-
-generic parts of the library. Each supported environment is represented by a
-subdirectory (dubbed "personality module") in personalities/. Such a module
-usually requires a specific compiler on a specific hardware.
-
-The concept of personality modules was favored over the traditional approach
-of '#ifdef', 'configure', and complex makefiles, because it isolates the
-environment dependencies in a limited number of files in a seperate directory, instead of spreading the dependency handling all over the code base. This
-approach also minimizes dependencies on the compilation environment, so that
-very minimalistic environments (which could e.g. not run a 'configure' script)
-could still compile the PDCLib.
-
-A personality module consists of:
-
-* standard '#define's and 'typedef's that are environment dependent (e.g. those
-  defined in stdint.h and float.h);
-
-* "abstract" '#define's that specify whether certain optional features are
-  available in the environment or not (e.g. whether the environment supports
-  the optional '_Imaginary' keyword, required in 'complex.h');
-
-* "glue code", which binds standard library functions to support functions of
-  the environment (e.g. the code actually allocating the memory passed out by
-  malloc()).
-
-* a (compiler-specific) solution for the type-generic math functions declared
-  in tgmath.h.
-
-In any case, it is sufficient to copy the contents of a personality module
-(consisting of the subdirectories functions/ and includes/) into the main
-directories of the same name. Your personalized copy of the PDCLib is now
-ready to be compiled.
-
-/* ------------------------------------------------------------------------- */
-
-ADDING A NEW ENVIRONMENT
-
-In the personalities/ subdirectory, you will find a module named "template". In
-this module, you will find a complete description of all '#define's, 'typedef's
-and glue code functions that are required to build a new personality module.
-
-A new personality module could be kept in our repository, or in the repository
-of the environment it refers to.
-
-If you are an OS developer opting to use the PDCLib as your standard library,
-you would be well-advised to keep the personality module in your own repository
-since you have direct access there, and can make necessary changes yourself.
-If you are not an OS developer, or your OS can be considered stable and active
-enough to warrant its own personality module in the PDCLib repository, you are
-free to submit it; but keep two things in mind: Any code contributed to this
-project must be Public Domain, and any contribution must be reviewed by the
-maintainers first. Please double-check your code before submitting.