- adds several config-options to allow for turning off certain features

  like
  o UCLIBC_HAS_GNU_ERROR
  o UCLIBC_HAS_BSD_ERR
  o UCLIBC_HAS_PTY
  o UCLIBC_HAS_GETPT (1)
  o UCLIBC_SYSCALL_STUBS
  o UCLIBC_SYSCALL_STUB_WARNING
  o UCLIBC_LINUX_SPECIFIC (2)
  o UCLIBC_BSD_SPECIFIC (3)
  o UCLIBC_NTP_LEGACY (4)
  o UCLIBC_SV4_DEPRECATED (5)
  o UCLIBC_HAVE_REALTIME (6)
  o UCLIBC_HAVE_ADVANCED_REALTIME (7)
  o UCLIBC_HAVE_EPOLL (8)
  o UCLIBC_HAVE_XATTR (9)
  o UCLIBC_HAVE_PROFILING (10)

(1) make non-standard getpt optional and implement standard posix_openpt
(2) fstatfs(), inotify_*(), ioperm(), iopl(), madvise(), modify_ldt(),
    personality()
    ppoll(), setresuid()
(3) mincore(), getdomainname(), setdomainname()
(4) ntp_adjtime(), ntp_gettime() aliases
(5) ustat() [use statfs(2) in your code instead]
(6) All marked as "(REALTIME)" in SUSv3
(7) All marked as "(ADVANCED REALTIME)" in SUSv3
(8) epoll_create(), epoll_ctl(), epoll_wait()
(9) all Extended Attributes
(10) helpers for gcc's -finstrument-functions

- Fixes _dl_exit()
- Implements sleep(3) for !UCLIBC_HAVE_REALTIME
- Implements usleep(3) for !UCLIBC_HAVE_REALTIME
- adds #warning about incorrect posix_fadvise{,64}()
- removes unused and unwanted uselib()

Net outcome is that an allnoconfig with HAVE_SHARED is now about 88k instead 
of formerly 130k.

43 files changed, 185 insertions, 56 deletions

diff --git a/libc/sysdeps/linux/common/Makefile.in b/libc/sysdeps/linux/common/Makefile.in
index 618785d62..d61ae9f4f 100644
--- a/libc/sysdeps/linux/common/Makefile.in
+++ b/libc/sysdeps/linux/common/Makefile.in
@@ -26,7 +26,54 @@ endif
 
 ifneq ($(UCLIBC_LINUX_MODULE_24),y)
 CSRC := $(filter-out create_module.c delete_module.c init_module.c \
-		query_module.c,$(CSRC))
+		query_module.c get_kernel_syms.c,$(CSRC))
+endif
+
+ifneq ($(UCLIBC_LINUX_SPECIFIC),y)
+# we need these internally: fstatfs.c statfs.c
+CSRC := $(filter-out inotify.c ioperm.c iopl.c madvise.c \
+	modify_ldt.c personality.c prctl.c readahead.c reboot.c \
+	remap_file_pages.c sched_getaffinity.c sched_setaffinity.c \
+	sendfile64.c sendfile.c setfsgid.c setfsuid.c setresuid.c \
+	splice.c vmsplice.c tee.c swapoff.c swapon.c sysctl.c sysinfo.c \
+	uselib.c vhangup.c,$(CSRC))
+endif
+
+ifneq ($(UCLIBC_BSD_SPECIFIC),y)
+# we need these internally: getdomainname.c
+CSRC := $(filter-out mincore.c setdomainname.c,$(CSRC))
+endif
+
+ifneq ($(UCLIBC_NTP_LEGACY),y)
+CSRC := $(filter-out ntp_gettime.c,$(CSRC))
+endif
+
+
+ifneq ($(UCLIBC_HAS_REALTIME),y)
+# aio_cancel|aio_error|aio_fsync|aio_read|aio_return|aio_suspend|aio_write|clock_getres|clock_gettime|clock_settime|clock_settime|fdatasync|lio_listio|mlockall|munlockall|mlock|munlock|mq_close|mq_getattr|mq_notify|mq_open|mq_receive|mq_timedreceive|mq_send|mq_timedsend|mq_setattr|mq_unlink|nanosleep|sched_getparam|sched_get_priority_max|sched_get_priority_min|sched_getscheduler|sched_rr_get_interval|sched_setparam|sched_setscheduler|sem_close|sem_destroy|sem_getvalue|sem_init|sem_open|sem_post|sem_trywait|sem_wait|sem_unlink|sem_wait|shm_open|shm_unlink|sigqueue|sigtimedwait|sigwaitinfo|sigwaitinfo|timer_create|timer_delete|timer_getoverrun|timer_gettime|timer_settime
+CSRC := $(filter-out clock_getres.c clock_gettime.c clock_settime.c fdatasync.c Makefile.in mlockall.c mlock.c munlockall.c munlock.c nanosleep.c __rt_sigtimedwait.c sched_getparam.c sched_get_priority_max.c sched_get_priority_min.c sched_getscheduler.c sched_rr_get_interval.c sched_setparam.c sched_setscheduler.c sigqueue.c,$(CSRC))
+endif
+
+
+ifneq ($(UCLIBC_HAS_ADVANCED_REALTIME),y)
+# clock_getcpuclockid|clock_nanosleep|mq_timedreceive|mq_timedsend|posix_fadvise|posix_fallocate|posix_madvise|posix_memalign|posix_mem_offset|posix_spawnattr_destroy|posix_spawnattr_init|posix_spawnattr_getflags|posix_spawnattr_setflags|posix_spawnattr_getpgroup|posix_spawnattr_setpgroup|posix_spawnattr_getschedparam|posix_spawnattr_setschedparam|posix_spawnattr_getschedpolicy|posix_spawnattr_setschedpolicy|posix_spawnattr_getsigdefault|posix_spawnattr_setsigdefault|posix_spawnattr_getsigmask|posix_spawnattr_setsigmask|posix_spawnattr_init|posix_spawnattr_setflags|posix_spawnattr_setpgroup|posix_spawnattr_setschedparam|posix_spawnattr_setschedpolicy|posix_spawnattr_setsigdefault|posix_spawnattr_setsigmask|posix_spawn_file_actions_addclose|posix_spawn_file_actions_addopen|posix_spawn_file_actions_adddup2|posix_spawn_file_actions_addopen|posix_spawn_file_actions_destroy|posix_spawn_file_actions_init|posix_spawn_file_actions_init|posix_spawn|posix_spawnp|posix_spawnp|posix_typed_mem_get_info|pthread_mutex_timedlock|sem_timedwait
+CSRC := $(filter-out posix_fadvise64.c posix_fadvise.c,$(CSRC))
+endif
+
+ifneq ($(UCLIBC_HAS_EPOLL),y)
+CSRC := $(filter-out epoll.c,$(CSRC))
+endif
+
+ifneq ($(UCLIBC_HAS_XATTR),y)
+CSRC := $(filter-out xattr.c,$(CSRC))
+endif
+
+ifneq ($(UCLIBC_HAS_PROFILING),y)
+CSRC := $(filter-out noophooks.c pcprofile.c,$(CSRC))
+endif
+
+ifneq ($(UCLIBC_SV4_DEPRECATED),y)
+CSRC := $(filter-out ustat.c,$(CSRC))
 endif
 
 # fails for some reason
diff --git a/libc/sysdeps/linux/common/adjtimex.c b/libc/sysdeps/linux/common/adjtimex.c
index e1225f46c..280f90e5a 100644
--- a/libc/sysdeps/linux/common/adjtimex.c
+++ b/libc/sysdeps/linux/common/adjtimex.c
@@ -14,4 +14,6 @@ libc_hidden_proto(adjtimex)
 
 _syscall1(int, adjtimex, struct timex *, buf);
 libc_hidden_def(adjtimex)
+#if defined __UCLIBC_NTP_LEGACY__
 strong_alias(adjtimex,ntp_adjtime)
+#endif
diff --git a/libc/sysdeps/linux/common/fstatfs.c b/libc/sysdeps/linux/common/fstatfs.c
index 7bcfeb36f..830de8103 100644
--- a/libc/sysdeps/linux/common/fstatfs.c
+++ b/libc/sysdeps/linux/common/fstatfs.c
@@ -10,7 +10,27 @@
 #include <sys/syscall.h>
 #include <sys/vfs.h>
 
-libc_hidden_proto(fstatfs)
+#if !defined __UCLIBC_LINUX_SPECIFIC__
+#ifndef __USE_FILE_OFFSET64
+extern int fstatfs (int __fildes, struct statfs *__buf)
+     __THROW __nonnull ((2));
+#else
+# ifdef __REDIRECT_NTH
+extern int __REDIRECT_NTH (fstatfs, (int __fildes, struct statfs *__buf),
+	fstatfs64) __nonnull ((2));
+# else
+#  define fstatfs fstatfs64
+# endif
+#endif
+#endif
+extern __typeof(fstatfs) __libc_fstatfs;
+libc_hidden_proto(__libc_fstatfs)
+#define __NR___libc_fstatfs __NR_fstatfs
+_syscall2(int, __libc_fstatfs, int, fd, struct statfs *, buf);
+libc_hidden_def(__libc_fstatfs)
 
-_syscall2(int, fstatfs, int, fd, struct statfs *, buf);
-libc_hidden_def(fstatfs)
+#if defined __UCLIBC_LINUX_SPECIFIC__
+libc_hidden_proto(fstatfs)
+weak_alias(__libc_fstatfs,fstatfs)
+libc_hidden_weak(fstatfs)
+#endif
diff --git a/libc/sysdeps/linux/common/getdomainname.c b/libc/sysdeps/linux/common/getdomainname.c
index d98651a97..86f6dfd32 100644
--- a/libc/sysdeps/linux/common/getdomainname.c
+++ b/libc/sysdeps/linux/common/getdomainname.c
@@ -16,8 +16,13 @@
 /* Experimentally off - libc_hidden_proto(strcpy) */
 libc_hidden_proto(uname)
 
-libc_hidden_proto(getdomainname)
-int getdomainname(char *name, size_t len)
+#if !defined __UCLIBC_BSD_SPECIFIC__
+extern int getdomainname (char *__name, size_t __len)
+	__THROW __nonnull ((1)) __wur;
+#endif
+extern __typeof(getdomainname) __libc_getdomainname;
+libc_hidden_proto(__libc_getdomainname)
+int __libc_getdomainname(char *name, size_t len)
 {
   struct utsname uts;
 
@@ -43,5 +48,10 @@ int getdomainname(char *name, size_t len)
 #endif
   return 0;
 }
-libc_hidden_def(getdomainname)
+libc_hidden_def(__libc_getdomainname)
+#if defined __UCLIBC_BSD_SPECIFIC__
+libc_hidden_proto(getdomainname)
+weak_alias(__libc_getdomainname,getdomainname)
+libc_hidden_weak(getdomainname)
+#endif /* __UCLIBC_BSD_SPECIFIC__ */
 #endif
diff --git a/libc/sysdeps/linux/common/getdtablesize.c b/libc/sysdeps/linux/common/getdtablesize.c
index 4efd8280d..44d21862f 100644
--- a/libc/sysdeps/linux/common/getdtablesize.c
+++ b/libc/sysdeps/linux/common/getdtablesize.c
@@ -9,6 +9,8 @@
 #include <sys/resource.h>
 #include <limits.h>
 
+/* XXX: _BSD || _XOPEN_SOURCE >= 500 */
+#if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
 libc_hidden_proto(getdtablesize)
 
 libc_hidden_proto(getrlimit)
@@ -27,3 +29,4 @@ int getdtablesize (void)
   return getrlimit (RLIMIT_NOFILE, &ru) < 0 ? __LOCAL_OPEN_MAX : ru.rlim_cur;
 }
 libc_hidden_def(getdtablesize)
+#endif
diff --git a/libc/sysdeps/linux/common/getpgid.c b/libc/sysdeps/linux/common/getpgid.c
index 3acd00db6..49f780adf 100644
--- a/libc/sysdeps/linux/common/getpgid.c
+++ b/libc/sysdeps/linux/common/getpgid.c
@@ -8,6 +8,8 @@
  */
 
 #include <sys/syscall.h>
+
+#if defined __USE_UNIX98
 #include <unistd.h>
 
 #define __NR___syscall_getpgid __NR_getpgid
@@ -17,3 +19,4 @@ pid_t getpgid(pid_t pid)
 {
 	return (__syscall_getpgid(pid));
 }
+#endif
diff --git a/libc/sysdeps/linux/common/getpgrp.c b/libc/sysdeps/linux/common/getpgrp.c
index 704ff5ace..a2fe44560 100644
--- a/libc/sysdeps/linux/common/getpgrp.c
+++ b/libc/sysdeps/linux/common/getpgrp.c
@@ -11,5 +11,6 @@
 #include <unistd.h>
 
 #ifdef __NR_getpgrp
+/* According to the manpage the POSIX.1 version is favoured */
 _syscall0(pid_t, getpgrp);
 #endif
diff --git a/libc/sysdeps/linux/common/getrlimit.c b/libc/sysdeps/linux/common/getrlimit.c
index 0684edca2..ecb09d1e2 100644
--- a/libc/sysdeps/linux/common/getrlimit.c
+++ b/libc/sysdeps/linux/common/getrlimit.c
@@ -17,7 +17,7 @@ libc_hidden_proto(getrlimit)
 
 /* Only wrap getrlimit if the new ugetrlimit is not present and getrlimit sucks */
 
-#if defined(__NR_ugetrlimit)
+#if defined __NR_ugetrlimit
 
 /* just call ugetrlimit() */
 # define __NR___syscall_ugetrlimit __NR_ugetrlimit
diff --git a/libc/sysdeps/linux/common/mincore.c b/libc/sysdeps/linux/common/mincore.c
index b4e053127..1dc9a9a1a 100644
--- a/libc/sysdeps/linux/common/mincore.c
+++ b/libc/sysdeps/linux/common/mincore.c
@@ -7,9 +7,9 @@
  */
 
 #include <sys/syscall.h>
+
+#if defined __NR_mincore && (defined __USE_BSD || defined __USE_SVID)
 #include <unistd.h>
 #include <sys/mman.h>
-
-#ifdef __NR_mincore
 _syscall3(int, mincore, void *, start, size_t, length, unsigned char *, vec);
 #endif
diff --git a/libc/sysdeps/linux/common/mprotect.c b/libc/sysdeps/linux/common/mprotect.c
index a5e6920a5..7122f0f2f 100644
--- a/libc/sysdeps/linux/common/mprotect.c
+++ b/libc/sysdeps/linux/common/mprotect.c
@@ -10,6 +10,6 @@
 #include <sys/syscall.h>
 #include <sys/mman.h>
 
-#ifdef __NR_mprotect
+#if defined __ARCH_USE_MMU__ && defined __NR_mprotect
 _syscall3(int, mprotect, void *, addr, size_t, len, int, prot);
 #endif
diff --git a/libc/sysdeps/linux/common/msync.c b/libc/sysdeps/linux/common/msync.c
index 352fb4903..88f021f43 100644
--- a/libc/sysdeps/linux/common/msync.c
+++ b/libc/sysdeps/linux/common/msync.c
@@ -10,17 +10,13 @@
 #include <sys/syscall.h>
 #include <unistd.h>
 
-#ifdef __NR_msync
+#if defined __NR_msync && defined __ARCH_USE_MMU__
 
 #include <sys/mman.h>
 
-#ifdef __ARCH_USE_MMU__
-
 extern __typeof(msync) __libc_msync;
 #define __NR___libc_msync __NR_msync
 _syscall3(int, __libc_msync, void *, addr, size_t, length, int, flags);
 weak_alias(__libc_msync,msync)
 
 #endif
-
-#endif
diff --git a/libc/sysdeps/linux/common/munlockall.c b/libc/sysdeps/linux/common/munlockall.c
index 20e8e72ab..39507715a 100644
--- a/libc/sysdeps/linux/common/munlockall.c
+++ b/libc/sysdeps/linux/common/munlockall.c
@@ -8,7 +8,9 @@
  */
 
 #include <sys/syscall.h>
+
+#if defined __NR_munlockall && defined __ARCH_USE_MMU__
 #include <sys/mman.h>
-#if defined __ARCH_USE_MMU__
+
 _syscall0(int, munlockall);
 #endif
diff --git a/libc/sysdeps/linux/common/nanosleep.c b/libc/sysdeps/linux/common/nanosleep.c
index b0600251f..c464403c5 100644
--- a/libc/sysdeps/linux/common/nanosleep.c
+++ b/libc/sysdeps/linux/common/nanosleep.c
@@ -10,6 +10,8 @@
 #include <sys/syscall.h>
 #include <time.h>
 
+#if defined __USE_POSIX199309 && defined __NR_nanosleep
+
 extern __typeof(nanosleep) __libc_nanosleep;
 #define __NR___libc_nanosleep __NR_nanosleep
 _syscall2(int, __libc_nanosleep, const struct timespec *, req,
@@ -17,3 +19,4 @@ _syscall2(int, __libc_nanosleep, const struct timespec *, req,
 libc_hidden_proto(nanosleep)
 weak_alias(__libc_nanosleep,nanosleep)
 libc_hidden_weak(nanosleep)
+#endif
diff --git a/libc/sysdeps/linux/common/poll.c b/libc/sysdeps/linux/common/poll.c
index 3b0a1fd52..164e08120 100644
--- a/libc/sysdeps/linux/common/poll.c
+++ b/libc/sysdeps/linux/common/poll.c
@@ -28,7 +28,7 @@ extern __typeof(poll) __libc_poll;
 _syscall3(int, __libc_poll, struct pollfd *, fds,
 	unsigned long int, nfds, int, timeout);
 
-#elif defined(__NR_ppoll)
+#elif defined(__NR_ppoll) && defined __UCLIBC_LINUX_SPECIFIC__
 
 libc_hidden_proto(ppoll)
 int __libc_poll(struct pollfd *fds, nfds_t nfds, int timeout)
diff --git a/libc/sysdeps/linux/common/posix_fadvise.c b/libc/sysdeps/linux/common/posix_fadvise.c
index a7ece5aec..45734f9b2 100644
--- a/libc/sysdeps/linux/common/posix_fadvise.c
+++ b/libc/sysdeps/linux/common/posix_fadvise.c
@@ -46,6 +46,7 @@ strong_alias(posix_fadvise,posix_fadvise64)
 #else
 int posix_fadvise(int fd attribute_unused, off_t offset attribute_unused, off_t len attribute_unused, int advice attribute_unused)
 {
+#warning This is not correct as far as SUSv3 is concerned.
 	return ENOSYS;
 }
 #endif
diff --git a/libc/sysdeps/linux/common/posix_fadvise64.c b/libc/sysdeps/linux/common/posix_fadvise64.c
index 994139c9c..7944c4985 100644
--- a/libc/sysdeps/linux/common/posix_fadvise64.c
+++ b/libc/sysdeps/linux/common/posix_fadvise64.c
@@ -74,6 +74,7 @@ int posix_fadvise64(int fd, __off64_t offset, __off64_t len, int advice)
  */
 int posix_fadvise64(int fd, __off64_t offset, __off64_t len, int advice)
 {
+#warning This is not correct as far as SUSv3 is concerned.
 	return ENOSYS;
 }
 #endif /* __NR_fadvise64_64 */
diff --git a/libc/sysdeps/linux/common/ppoll.c b/libc/sysdeps/linux/common/ppoll.c
index ab96e8ba4..90b3517b2 100644
--- a/libc/sysdeps/linux/common/ppoll.c
+++ b/libc/sysdeps/linux/common/ppoll.c
@@ -20,7 +20,7 @@
 #include <sys/syscall.h>
 #include <sys/poll.h>
 
-#ifdef __NR_ppoll
+#if defined __NR_ppoll && defined __UCLIBC_LINUX_SPECIFIC__
 
 libc_hidden_proto(ppoll)
 
diff --git a/libc/sysdeps/linux/common/ptrace.c b/libc/sysdeps/linux/common/ptrace.c
index 56a21e5ce..9d6767374 100644
--- a/libc/sysdeps/linux/common/ptrace.c
+++ b/libc/sysdeps/linux/common/ptrace.c
@@ -4,12 +4,12 @@
  * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
  */
 
-#include <errno.h>
+#include <sys/syscall.h>
 #include <sys/types.h>
 #include <sys/ptrace.h>
-#include <sys/syscall.h>
 #include <stdarg.h>
 
+#if defined __NR_ptrace && defined __USE_BSD && defined __USE_MISC
 #define __NR___syscall_ptrace __NR_ptrace
 
 static inline _syscall4(long, __syscall_ptrace, enum __ptrace_request, request,
@@ -40,3 +40,4 @@ ptrace (enum __ptrace_request request, ...)
 
   return res;
 }
+#endif
diff --git a/libc/sysdeps/linux/common/quotactl.c b/libc/sysdeps/linux/common/quotactl.c
index 7363c63e0..cb044a4e8 100644
--- a/libc/sysdeps/linux/common/quotactl.c
+++ b/libc/sysdeps/linux/common/quotactl.c
@@ -8,6 +8,9 @@
  */
 
 #include <sys/syscall.h>
+
+#if defined __USE_BSD
 #include <sys/quota.h>
 _syscall4(int, quotactl, int, cmd, const char *, special,
 		  int, id, caddr_t, addr);
+#endif
diff --git a/libc/sysdeps/linux/common/sbrk.c b/libc/sysdeps/linux/common/sbrk.c
index 4ac2d2a21..734a4ce01 100644
--- a/libc/sysdeps/linux/common/sbrk.c
+++ b/libc/sysdeps/linux/common/sbrk.c
@@ -21,7 +21,7 @@ void * sbrk (intptr_t increment)
     void *oldbrk;
 
     if (__curbrk == NULL)
-	if (brk (0) < 0)		/* Initialize the break.  */
+	if (brk (NULL) < 0)	/* Initialize the break.  */
 	    return (void *) -1;
 
     if (increment == 0)
diff --git a/libc/sysdeps/linux/common/select.c b/libc/sysdeps/linux/common/select.c
index 03fda35b7..71a4990ab 100644
--- a/libc/sysdeps/linux/common/select.c
+++ b/libc/sysdeps/linux/common/select.c
@@ -12,8 +12,7 @@
 
 extern __typeof(select) __libc_select;
 
-#if !defined(__NR__newselect) && !defined(__NR_select)
-
+#if !defined(__NR__newselect) && !defined(__NR_select) && defined __USE_XOPEN2K
 # define __NR___libc_pselect6 __NR_pselect6
 _syscall6(int, __libc_pselect6, int, n, fd_set *, readfds, fd_set *, writefds,
 	fd_set *, exceptfds, const struct timespec *, timeout,
diff --git a/libc/sysdeps/linux/common/seteuid.c b/libc/sysdeps/linux/common/seteuid.c
index 35a68334d..5a6e9a25a 100644
--- a/libc/sysdeps/linux/common/seteuid.c
+++ b/libc/sysdeps/linux/common/seteuid.c
@@ -11,6 +11,11 @@
 #include <sys/types.h>
 #include <sys/syscall.h>
 
+#if !defined __UCLIBC_LINUX_SPECIFIC__
+#undef __NR_setresuid
+#undef __NR_setresuid32
+#endif
+
 libc_hidden_proto(seteuid)
 
 #if (defined __NR_setresuid || defined __NR_setresuid32) && defined __USE_GNU
diff --git a/libc/sysdeps/linux/common/setpgid.c b/libc/sysdeps/linux/common/setpgid.c
index 144ffa959..3447b999d 100644
--- a/libc/sysdeps/linux/common/setpgid.c
+++ b/libc/sysdeps/linux/common/setpgid.c
@@ -8,6 +8,8 @@
  */
 
 #include <sys/syscall.h>
+
+#if defined __USE_UNIX98 || defined __USE_SVID
 #include <unistd.h>
 
 libc_hidden_proto(setpgid)
@@ -21,3 +23,4 @@ int setpgid(pid_t pid, pid_t pgid)
 	return (__syscall_setpgid(pid, pgid));
 }
 libc_hidden_def(setpgid)
+#endif
diff --git a/libc/sysdeps/linux/common/setresuid.c b/libc/sysdeps/linux/common/setresuid.c
index 883d7a952..54b92465c 100644
--- a/libc/sysdeps/linux/common/setresuid.c
+++ b/libc/sysdeps/linux/common/setresuid.c
@@ -8,7 +8,7 @@
  */
 
 #include <sys/syscall.h>
-#ifdef __USE_GNU
+#if defined __USE_GNU && defined __UCLIBC_LINUX_SPECIFIC__
 #include <unistd.h>
 
 #if defined(__NR_setresuid32)
diff --git a/libc/sysdeps/linux/common/sigaltstack.c b/libc/sysdeps/linux/common/sigaltstack.c
index 624c87792..0c9308408 100644
--- a/libc/sysdeps/linux/common/sigaltstack.c
+++ b/libc/sysdeps/linux/common/sigaltstack.c
@@ -10,7 +10,8 @@
 #include <sys/syscall.h>
 #include <signal.h>
 
-#ifdef __NR_sigaltstack
+#if defined __NR_sigaltstack && (defined __USE_BSD || defined __USE_UNIX98)
+
 _syscall2(int, sigaltstack, const struct sigaltstack *, ss,
 		  struct sigaltstack *, oss);
 #endif
diff --git a/libc/sysdeps/linux/common/sigpending.c b/libc/sysdeps/linux/common/sigpending.c
index e2928cbe1..fa272c0f5 100644
--- a/libc/sysdeps/linux/common/sigpending.c
+++ b/libc/sysdeps/linux/common/sigpending.c
@@ -8,6 +8,8 @@
  */
 
 #include <sys/syscall.h>
+
+#if defined __USE_POSIX
 #include <signal.h>
 #undef sigpending
 
@@ -22,3 +24,4 @@ int sigpending(sigset_t * set)
 #else
 _syscall1(int, sigpending, sigset_t *, set);
 #endif
+#endif
diff --git a/libc/sysdeps/linux/common/sigprocmask.c b/libc/sysdeps/linux/common/sigprocmask.c
index dd7bd6c3a..d36a5045e 100644
--- a/libc/sysdeps/linux/common/sigprocmask.c
+++ b/libc/sysdeps/linux/common/sigprocmask.c
@@ -8,6 +8,8 @@
  */
 
 #include <sys/syscall.h>
+
+#if defined __USE_POSIX
 #include <signal.h>
 
 #undef sigprocmask
@@ -68,3 +70,4 @@ int sigprocmask(int how, const sigset_t * set, sigset_t * oldset)
 }
 #endif
 libc_hidden_def(sigprocmask)
+#endif
diff --git a/libc/sysdeps/linux/common/sigqueue.c b/libc/sysdeps/linux/common/sigqueue.c
index 9019852f1..5d8e852fe 100644
--- a/libc/sysdeps/linux/common/sigqueue.c
+++ b/libc/sysdeps/linux/common/sigqueue.c
@@ -22,6 +22,7 @@
 #include <string.h>
 
 #include <sys/syscall.h>
+#if defined __USE_POSIX199309
 
 libc_hidden_proto(getpid)
 libc_hidden_proto(getuid)
@@ -51,3 +52,4 @@ int sigqueue (pid_t pid, int sig, const union sigval val)
 }
 
 #endif
+#endif
diff --git a/libc/sysdeps/linux/common/sigsuspend.c b/libc/sysdeps/linux/common/sigsuspend.c
index 373bd333a..81bbbeec4 100644
--- a/libc/sysdeps/linux/common/sigsuspend.c
+++ b/libc/sysdeps/linux/common/sigsuspend.c
@@ -8,6 +8,8 @@
  */
 
 #include <sys/syscall.h>
+
+#if defined __USE_POSIX
 #include <signal.h>
 
 extern __typeof(sigsuspend) __libc_sigsuspend;
@@ -33,3 +35,4 @@ int __libc_sigsuspend(const sigset_t * set)
 libc_hidden_proto(sigsuspend)
 weak_alias(__libc_sigsuspend,sigsuspend)
 libc_hidden_weak(sigsuspend)
+#endif
diff --git a/libc/sysdeps/linux/common/statfs.c b/libc/sysdeps/linux/common/statfs.c
index eb029a26a..38c277fad 100644
--- a/libc/sysdeps/linux/common/statfs.c
+++ b/libc/sysdeps/linux/common/statfs.c
@@ -12,6 +12,14 @@
 #include <sys/param.h>
 #include <sys/vfs.h>
 
+extern __typeof(statfs) __libc_statfs;
+libc_hidden_proto(__libc_statfs)
+#define __NR___libc_statfs __NR_statfs
+_syscall2(int, __libc_statfs, const char *, path, struct statfs *, buf);
+libc_hidden_def(__libc_statfs)
+
+#if defined __UCLIBC_LINUX_SPECIFIC__
 libc_hidden_proto(statfs)
-_syscall2(int, statfs, const char *, path, struct statfs *, buf);
-libc_hidden_def(statfs)
+weak_alias(__libc_statfs,statfs)
+libc_hidden_weak(statfs)
+#endif
diff --git a/libc/sysdeps/linux/common/symlink.c b/libc/sysdeps/linux/common/symlink.c
index 80fb58a28..97f34eb8f 100644
--- a/libc/sysdeps/linux/common/symlink.c
+++ b/libc/sysdeps/linux/common/symlink.c
@@ -8,5 +8,7 @@
  */
 
 #include <sys/syscall.h>
+#if defined __USE_BSD || defined __USE_UNIX98 || defined __USE_XOPEN2K
 #include <unistd.h>
 _syscall2(int, symlink, const char *, oldpath, const char *, newpath);
+#endif
diff --git a/libc/sysdeps/linux/common/sync.c b/libc/sysdeps/linux/common/sync.c
index 48fac63ea..dd69e335b 100644
--- a/libc/sysdeps/linux/common/sync.c
+++ b/libc/sysdeps/linux/common/sync.c
@@ -7,10 +7,9 @@
  * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
  */
 
-#include <features.h>
-#include <errno.h>
-#include <sys/types.h>
 #include <sys/syscall.h>
+# if defined __USE_BSD || defined __USE_UNIX98
+#include <sys/types.h>
 #include <unistd.h>
 
 #ifndef INLINE_SYSCALL
@@ -23,4 +22,4 @@ void sync(void)
 {
 	INLINE_SYSCALL(sync, 0);
 }
-
+#endif
diff --git a/libc/sysdeps/linux/common/sysctl.c b/libc/sysdeps/linux/common/sysctl.c
index 3cd4f5e41..adee22837 100644
--- a/libc/sysdeps/linux/common/sysctl.c
+++ b/libc/sysdeps/linux/common/sysctl.c
@@ -8,6 +8,8 @@
  */
 
 #include <sys/syscall.h>
+#if defined __NR__sysctl && (defined __USE_GNU || defined __USE_BSD)
+
 /* psm: including sys/sysctl.h would depend on kernel headers */
 extern int sysctl (int *__name, int __nlen, void *__oldval,
 		   size_t *__oldlenp, void *__newval, size_t __newlen) __THROW;
@@ -29,13 +31,14 @@ int sysctl(int *name, int nlen, void *oldval, size_t * oldlenp,
 		   void *newval, size_t newlen)
 {
 	struct __sysctl_args args = {
-	  name:name,
-	  nlen:nlen,
-	  oldval:oldval,
-	  oldlenp:oldlenp,
-	  newval:newval,
-	  newlen:newlen
+	  .name = name,
+	  .nlen = nlen,
+	  .oldval = oldval,
+	  .oldlenp = oldlenp,
+	  .newval = newval,
+	  .newlen = newlen
 	};
 
 	return _sysctl(&args);
 }
+#endif
diff --git a/libc/sysdeps/linux/common/sysfs.c b/libc/sysdeps/linux/common/sysfs.c
index 5099d7bb0..a4292f768 100644
--- a/libc/sysdeps/linux/common/sysfs.c
+++ b/libc/sysdeps/linux/common/sysfs.c
@@ -9,8 +9,9 @@
 
 /* libc isn't really supposed to export this */
 #if 0
-
 #include <sys/syscall.h>
-_syscall3(int, sysfs, int, option, unsigned int, index, char, addr);
 
+#if defined __USE_SVID
+_syscall3(int, sysfs, int, option, unsigned int, index, char, addr);
+#endif
 #endif
diff --git a/libc/sysdeps/linux/common/tee.c b/libc/sysdeps/linux/common/tee.c
index 647440815..6725e82bb 100644
--- a/libc/sysdeps/linux/common/tee.c
+++ b/libc/sysdeps/linux/common/tee.c
@@ -10,19 +10,7 @@
 #include <sys/syscall.h>
 #include <fcntl.h>
 
-libc_hidden_proto(tee)
-
 #ifdef __NR_tee
 _syscall4(ssize_t, tee, int, __fdin, int, __fdout, size_t, __len,
 	unsigned int, __flags);
-#else
-ssize_t tee(int __fdin, int __fdout, size_t __len, unsigned int __flags)
-{
-	__set_errno(ENOSYS);
-	return -1;
-}
 #endif
-
-libc_hidden_def(tee)
-
-
diff --git a/libc/sysdeps/linux/common/truncate64.c b/libc/sysdeps/linux/common/truncate64.c
index e227900c5..53c46fc56 100644
--- a/libc/sysdeps/linux/common/truncate64.c
+++ b/libc/sysdeps/linux/common/truncate64.c
@@ -57,7 +57,7 @@ int truncate64 (const char * path, __off64_t length)
 }
 
 #else /* __WORDSIZE */
-#error Your machine is not 64 bit or 32 bit, I am dazed and confused.
+#error Your machine is not 64 bit nor 32 bit, I am dazed and confused.
 #endif /* __WORDSIZE */
 
 #else  /* __NR_truncate64 */
diff --git a/libc/sysdeps/linux/common/umount.c b/libc/sysdeps/linux/common/umount.c
index f524ea1da..c62f9fb7c 100644
--- a/libc/sysdeps/linux/common/umount.c
+++ b/libc/sysdeps/linux/common/umount.c
@@ -8,6 +8,8 @@
  */
 
 #include <sys/syscall.h>
+
+#if defined __USE_GNU
 #include <sys/mount.h>
 
 /* arch provides umount() syscall */
@@ -36,3 +38,4 @@ int umount(const char *special_file)
 }
 
 #endif
+#endif
diff --git a/libc/sysdeps/linux/common/umount2.c b/libc/sysdeps/linux/common/umount2.c
index 97ab41e72..25c24d450 100644
--- a/libc/sysdeps/linux/common/umount2.c
+++ b/libc/sysdeps/linux/common/umount2.c
@@ -8,8 +8,10 @@
  */
 
 #include <sys/syscall.h>
-#ifdef __NR_umount2	/* Old kernels don't have umount2 */
+
+#if defined __USE_GNU
 #include <sys/mount.h>
+#ifdef __NR_umount2	/* Old kernels don't have umount2 */
 _syscall2(int, umount2, const char *, special_file, int, flags);
 #else
 int umount2(const char *special_file, int flags)
@@ -18,3 +20,4 @@ int umount2(const char *special_file, int flags)
 	return -1;
 }
 #endif
+#endif
diff --git a/libc/sysdeps/linux/common/uselib.c b/libc/sysdeps/linux/common/uselib.c
index a18f3f463..ffc5d77a1 100644
--- a/libc/sysdeps/linux/common/uselib.c
+++ b/libc/sysdeps/linux/common/uselib.c
@@ -6,6 +6,8 @@
  *
  * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
  */
+#if 0
+linux specific and we do not use it in uClibc.
 
 #include <sys/syscall.h>
 #include <unistd.h>
@@ -13,3 +15,4 @@
 int uselib (const char *library);
 _syscall1(int, uselib, const char *, library);
 #endif
+#endif
diff --git a/libc/sysdeps/linux/common/utimes.c b/libc/sysdeps/linux/common/utimes.c
index 4c7e10a87..83ddb7381 100644
--- a/libc/sysdeps/linux/common/utimes.c
+++ b/libc/sysdeps/linux/common/utimes.c
@@ -35,4 +35,5 @@ int utimes(const char *file, const struct timeval tvp[2])
 	return utime(file, times);
 }
 #endif
+link_warning(utimes, "the use of LEGACY `utimes' is discouraged, use `utime'")
 libc_hidden_def(utimes)
diff --git a/libc/sysdeps/linux/common/wait3.c b/libc/sysdeps/linux/common/wait3.c
index 5de975c25..8a2d43f7a 100644
--- a/libc/sysdeps/linux/common/wait3.c
+++ b/libc/sysdeps/linux/common/wait3.c
@@ -4,11 +4,13 @@
  * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
  */
 
-#include <syscall.h>
+#include <sys/syscall.h>
 #include <sys/types.h>
 #include <sys/wait.h>
 #include <sys/resource.h>
 
+#if defined __USE_BSD
+
 libc_hidden_proto(wait4)
 
 /* Wait for a child to exit.  When one does, put its status in *STAT_LOC and
@@ -20,3 +22,4 @@ pid_t wait3 (__WAIT_STATUS stat_loc, int options, struct rusage * usage)
 {
       return wait4 (WAIT_ANY, stat_loc, options, usage);
 }
+#endif
diff --git a/libc/sysdeps/linux/common/wait4.c b/libc/sysdeps/linux/common/wait4.c
index 4f0f21ddf..ff3b82645 100644
--- a/libc/sysdeps/linux/common/wait4.c
+++ b/libc/sysdeps/linux/common/wait4.c
@@ -8,6 +8,7 @@
  */
 
 #include <sys/syscall.h>
+#if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
 #include <sys/wait.h>
 #include <sys/resource.h>
 
@@ -22,3 +23,4 @@ pid_t wait4(pid_t pid, int *status, int opts, struct rusage *rusage)
 	return (__syscall_wait4(pid, status, opts, rusage));
 }
 libc_hidden_def(wait4)
+#endif
diff --git a/libc/sysdeps/linux/common/waitid.c b/libc/sysdeps/linux/common/waitid.c
index 0e25acb62..b8d2f70ba 100644
--- a/libc/sysdeps/linux/common/waitid.c
+++ b/libc/sysdeps/linux/common/waitid.c
@@ -6,10 +6,11 @@
  */
 
 #include <sys/syscall.h>
+
+#if defined __USE_SVID || defined __USE_XOPEN
 #include <unistd.h>
 #include <sys/types.h>
 #include <sys/wait.h>
 
-#ifdef __NR_waitid
 _syscall4(int, waitid, idtype_t, idtype, id_t, id, siginfo_t*, infop, int, options);
 #endif