Patch acadia support with stubs.

config.sub

@@ -1695,7 +1695,7 @@ case $os in
 	# Now accept the basic system types.
 	# The portable systems comes first.
 	# Each alternative MUST end in a * to match a version number.
-	gnu* | android* | bsd* | mach* | minix* | genix* | ultrix* | irix* \
+	gnu* | acadia* | android* | bsd* | mach* | minix* | genix* | ultrix* | irix* \
 	     | *vms* | esix* | aix* | cnk* | sunos | sunos[34]* \
 	     | hpux* | unos* | osf* | luna* | dgux* | auroraux* | solaris* \
 	     | sym* |  plan9* | psp* | sim* | xray* | os68k* | v88r* \

newlib/configure.host

@@ -419,6 +419,9 @@ fi
 # THIS TABLE IS ALPHA SORTED.  KEEP IT THAT WAY.
 
 case "${host}" in
+  *-*-acadia*)
+  sys_dir=acadia
+  ;;
   *-*-cygwin*)
 	posix_dir=posix
 	xdr_dir=xdr

newlib/libc/sys/Makefile.inc

@@ -1,6 +1,9 @@
 if HAVE_LIBC_SYS_A29KHIF_DIR
 include %D%/a29khif/Makefile.inc
 endif
+if HAVE_LIBC_SYS_ACADIA_DIR
+include %D%/acadia/Makefile.inc
+endif
 if HAVE_LIBC_SYS_AMDGCN_DIR
 include %D%/amdgcn/Makefile.inc
 endif

newlib/libc/sys/acadia/Makefile.inc

@@ -0,0 +1 @@
+libc_a_SOURCES += syscalls.c crt0.c

newlib/libc/sys/acadia/crt0.c

@@ -0,0 +1,11 @@
+#include <fcntl.h>
+
+extern void exit(int code);
+extern int main();
+extern void _init_signal();
+
+void _start() {
+  _init_signal();
+  int ex = main();
+  exit(ex);
+}

newlib/libc/sys/acadia/syscalls.c

@@ -0,0 +1,29 @@
+#include <stdio.h>
+#include <sys/errno.h>
+#include <sys/fcntl.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#include <sys/times.h>
+#include <sys/types.h>
+
+void _exit();
+int close(int file) { return ENOSYS; }
+char **environ; /* pointer to array of char * strings that define the current
+                   environment variables */
+int execve(char *name, char **argv, char **env) { return ENOSYS; }
+int fork() { return ENOSYS; }
+int fstat(int file, struct stat *st) { return ENOSYS; }
+int getpid() { return ENOSYS; }
+int isatty(int file) { return ENOSYS; }
+int kill(int pid, int sig) { return ENOSYS; }
+int link(char *old, char *new_l) { return ENOSYS; }
+int lseek(int file, int ptr, int dir) { return ENOSYS; }
+int open(const char *name, int flags, ...) { return ENOSYS; }
+int read(int file, char *ptr, int len) { return ENOSYS; }
+caddr_t sbrk(int incr) { return 0; }
+int stat(const char *file, struct stat *st) { return ENOSYS; }
+clock_t times(struct tms *buf) { return ENOSYS; }
+int unlink(char *name) { return ENOSYS; }
+int wait(int *status) { return ENOSYS; }
+int write(int file, char *ptr, int len) { return ENOSYS; }
+int gettimeofday(struct timeval *p, struct timezone *z) { return ENOSYS; }