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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.
_LARGEFILE_SOURCE
If defined, headers will provide functions fseeko and ftello.
_LARGEFILE64_SOURCE
If defined, headers will in addition to data types, constants and
functions named xxx (e.g. off_t, struct stat, F_SETLK, ftruncate())
supply data types, constants and functions named xxx64 (e.g. off64_t,
struct stat64, F_SETLK64, ftruncate64()) known as an interface for
64-bit file offsets.
__USE_LARGEFILE[64]
Defined to 1 and used internally when built with _LARGEFILE[64]_SOURCE.
Undefined otherwise.
_FILE_OFFSET_BITS
Select default filesystem interface. When defined as 64 the data types,
constants and functions mentioned in _LARGEFILE64_SOURCE as xxx are
aliased to the corresponding xxx64 data types, constants and functions.
_FILE_OFFSET_BITS=64 enables both __USE_LARGEFILE and __USE_LARGEFILE64.
This flag does not affect the way libc itself is built, it only affects
what declarations are provided to library user.
__USE_FILE_OFFSET64
Defined to 1 and used internally when built with _FILE_OFFSET_BITS=64.
Undefined otherwise.
__THROW
Function annotation "I do not throw anything".
__NTH(func(params))
Function annotation "I do not throw anything".
Needed for situatuons when it's unclear on what side of "func(params)"
the "throw()" or "attribute((nothrow))" should eventually appear.
Messy, eh?
return_type __REDIRECT(name, (params), alias)
declare alias to "name(params)"
return_type __REDIRECT_NTH(name, (params), alias)
declare alias to "name(params) __THROW"
__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
Defined only at libc build time. It is physically deleted
from the 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)
__LDBL_COMPAT
Never defined, TODO: remove?
__SSP_ALL__
All functions, even small ones, have stack smashing protection
prologue enabled.
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