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Feeble attempt to document the horde of #defines we deal with.
Editors, please make your descriptions short but informative.
__BEGIN_DECLS, __END_DECLS
Defined to either empty or 'extern "C" {' and '}' if included by C++.
__USE_GNU, __USE_BSD, __USE_XOPEN[2K], __USE_SVID, __USE_POSIX...
If defined, user program which included us requests compat additions
from relevant standard or Unix flavor. See features.h for full list.
__USE_FILE_OFFSET64
__USE_LARGEFILE[64]
_LARGEFILE[64]_SOURCE
_FILE_OFFSET_BITS
???
__NTH(fct)
__THROW
__REDIRECT(name, proto, alias)
__REDIRECT_NTH(name, proto, alias)
???
__BIG_ENDIAN 4321
__LITTLE_ENDIAN 1234
Should be always as shown. __PDP_ENDIAN is historic, ignore?
__BYTE_ORDER, __FLOAT_WORD_ORDER
Should be defined to __BIG_ENDIAN or __LITTLE_ENDIAN.
Usage: "#if __BYTE_ORDER == __LITTLE_ENDIAN ..."
__USE_BSD adds versions without leading "__" for above four defines.
_BIG_ENDIAN, __BIG_ENDIAN__
_LITTLE_ENDIAN, __LITTLE_ENDIAN__
Defined (to what?) by gcc for some architectures to indicate endianness.
Seems that the fact of defined-ness is an indicator, not the value.
__USE_EXTERN_INLINES
If defined, headers will supply some function as inlines.
uclibc itself is built with this option off and provides
out-of-line version of every inlined function in case user program
calls it instead of using an inline.
_EXTERN_INLINE
If not defined by user prior to #include, will be defined to
"extern inline" or equivalent. IOW, if user defines it prior
#include, it replaces "extern __inline" string in inline definitions
(those enabled by __USE_EXTERN_INLINES) with something else.
A few uclibc .c files use it to create non-inlined functions
by defining it to "".
__extern_inline
Defined to "extern inline", modulo gcc/C standard deviations.
Can't be used by user to play tricks as with _EXTERN_INLINE.
internal_function
Used to modify function's calling convention, if "standard" one
is suboptimal. Examples:
int func(params) internal_function;
int internal_function func(params) { body }
_LIBC
UCLIBC_INTERNAL
Defined only at libc build time. _LIBC is probably from glibc,
and UCLIBC_INTERNAL is added by vda (he didn't know about _LIBC).
Both defines are physically deleted from headers (using unifdef tool)
in installed headers ("make install").
__UCLIBC_XXX
uclibc-internal and uclibc-specific defines. In particular:
__UCLIBC_HAS_XXX__, __UCLIBC_HAVE_XXX__
__UCLIBC_HAS_XXX__ are booleans (defined/undefined), defined in
uClibc_config.h and generated from uclibc .config file.
__UCLIBC_HAVE_XXX__ are booleans from bits/uClibc_arch_features.h
(there are more __UCLIBC_XXX defines there)
_IEEE_LIBM
Always defined at libm build time
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