mescc: Support binutils-2.30.

* lib/binutils.c (raise, strdup): New function.
  (mbstowcs): New stub.
* include/fcntl.h (O_APPEND, FD_CLOEXEC): New define.

include/errno.h

@@ -29,6 +29,7 @@
 #else // ! WITH_GLIBC
 int errno;
 #define ENOENT   2
+#define EINTR    4
 #define EIO      5
 #define EBADF    9
 #define EAGAIN  11

include/fcntl.h

@@ -28,12 +28,16 @@
 #include_next <fcntl.h>
 
 #else // ! WITH_GLIBC
+
 #define O_RDONLY 0
 #define O_WRONLY 1
 #define O_RDWR 2
 #define O_CREAT 64
 #define O_EXCL 128
 #define O_TRUNC 512
+#define O_APPEND 1024
+
+#define FD_CLOEXEC 1
 
 #define F_DUPFD 0
 #define F_GETFD 1

include/sys/resource.h

@@ -26,6 +26,8 @@
 
 #else // ! WITH_GLIBC
 
+#include <sys/time.h>
+
 struct rusage
 {
   struct timeval ru_utime;

lib/binutils.c

@@ -223,3 +223,55 @@ sbrk (intptr_t delta)
     return malloc (delta);
   return g_brk;
 }
+
+// binutils 2.30
+char *
+strdup (char const *s)
+{
+  size_t length = strlen (s) + 1;
+  char *p = (char*)malloc (length);
+  if (p)
+    return memcpy (p, s, length);
+  return 0;
+}
+
+int
+raise (int signum)
+{
+  kill (getpid (), signum);
+}
+
+size_t
+strftime (char *s, size_t size, char const *template,
+          struct tm const *brokentime)
+{
+   eputs ("strftime stub\n");
+   return template;
+}
+
+#if !__MESC__
+typedef char wchar_t[];
+
+size_t
+mbstowcs (wchar_t *wstring, char const *string,
+          size_t size)
+{
+  eputs ("mbstowcs stub\n");
+  strcpy (wstring, string);
+  return strlen (string);
+}
+#endif
+
+void
+clearerr (FILE *stream)
+{
+  errno = 0;
+}
+
+double
+fabs (double number)
+{
+  if (number < 0)
+    return -number;
+  return number;
+}