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1998-04-21 21:49  Zack Weinberg  <zack@rabi.phys.columbia.edu>

	* misc/sys/cdefs.h: New macro __REDIRECT to support changing the
	asm symbol name of functions.
	* include/features.h: Kill redundant test.

	* dirent/dirent.h: Use new macros to implement __USE_FILE_OFFSET64.
	* io/ftw.h: Likewise.
	* io/sys/stat.h: Likewise.
	* io/sys/statfs.h: Likewise.
	* io/sys/statvfs.h: Likewise.
	* libio/stdio.h: Likewise.
	* resource/sys/resource.h: Likewise.
	* rt/aio.h: Likewise.

	* posix/unistd.h: Use new macros for __USE_FILE_OFFSET64 and
	 __FAVOR_BSD.
	* signal/signal.h: Use new macros for BSD vs. SysV signal().

	* misc/Makefile: Drop bsd-compat.c.  Make libbsd-compat.a
	a dummy library.
	* misc/bsd-compat.c: Removed.
This commit is contained in:
Ulrich Drepper
1998-04-21 22:58:23 +00:00
parent 28f1c862dd
commit 01cad72266
16 changed files with 518 additions and 432 deletions
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36
misc/sys/cdefs.h
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@ -95,15 +95,39 @@
# define __END_DECLS
#endif
/* GCC2 has various useful declarations that can be made with the
`__attribute__' syntax. All of the ways we use this do fine if
they are omitted for compilers that don't understand it. */
#if !defined __GNUC__ || __GNUC__ < 2
# define __attribute__(xyz) /* Ignore. */
/* __asm__ ("xyz") is used throughout the headers to rename functions
at the assembly language level. This is wrapped by the __REDIRECT
macro, in order to support compilers that can do this some other
way. When compilers don't support asm-names at all, we have to do
preprocessor tricks instead (which don't have exactly the right
semantics, but it's the best we can do).
Example:
int __REDIRECT(setpgrp, __P((__pid_t pid, __pid_t pgrp)), setpgid); */
#if defined __GNUC__ && __GNUC__ >= 2
# define __REDIRECT(name, proto, asname) name proto __asm__ (#asname)
/*
#elif __SOME_OTHER_COMPILER__
# define __attribute__(xyz)
# define __ALIAS(name, proto, asname) name proto; \
_Pragma("let " #name " = " #asname)
*/
#endif
/* GCC has various useful declarations that can be made with the
`__attribute__' syntax. All of the ways we use this do fine if
they are omitted for compilers that don't understand it. */
#if !defined __GNUC__ || __GNUC__ < 2
/* For now no version of gcc knows the `restrict' keyword. Define it
# define __attribute__(xyz) /* Ignore. */
#endif
/* No current version of gcc knows the `restrict' keyword. Define it
for now unconditionally to the empty string. */
#define __restrict