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authorUlrich Drepper <drepper@redhat.com>1998-04-21 22:58:23 +0000
committerUlrich Drepper <drepper@redhat.com>1998-04-21 22:58:23 +0000
commit01cad722667c7b25535b2d248598f3d535e7caa9 (patch)
tree606a2436a10d7d48fcbb3e1097500d8a0b8144d1 /misc/sys
parent28f1c862ddaa3515d0f74102379301048c76cf0f (diff)
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Update.
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.
Diffstat (limited to 'misc/sys')
-rw-r--r--misc/sys/cdefs.h34
1 files changed, 29 insertions, 5 deletions
diff --git a/misc/sys/cdefs.h b/misc/sys/cdefs.h
index 5f40a0a45d..c0c442e011 100644
--- a/misc/sys/cdefs.h
+++ b/misc/sys/cdefs.h
@@ -95,15 +95,39 @@
# define __END_DECLS
#endif
-/* GCC2 has various useful declarations that can be made with the
+/* __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. */
+ they are omitted for compilers that don't understand it. */
#if !defined __GNUC__ || __GNUC__ < 2
-# define __attribute__(xyz) /* Ignore. */
-#endif
+# define __attribute__(xyz) /* Ignore. */
+
+#endif
-/* For now no version of gcc knows the `restrict' keyword. Define it
+/* No current version of gcc knows the `restrict' keyword. Define it
for now unconditionally to the empty string. */
#define __restrict