kFreeBSD configuration fixes

and use "uconfig.h" for default configuration

src/configure

@@ -3880,7 +3880,7 @@ case $OS in
     enable_cgcdefault="yes"
     EXTRALIBS="-Wl,-brtl,-bE:\$(srcdir)/../racket/include/racket.exp"
     ;;
-  FreeBSD)
+  *FreeBSD)
     LIBS="$LIBS -rdynamic"
     DYN_CFLAGS="-fPIC"
     GC_THREADS_FLAG="-DGC_FREEBSD_THREADS"

src/racket/configure.ac

@@ -513,7 +513,7 @@ case $OS in
     enable_cgcdefault="yes"
     EXTRALIBS="-Wl,-brtl,-bE:\$(srcdir)/../racket/include/racket.exp"
     ;;
-  FreeBSD)
+  *FreeBSD)
     LIBS="$LIBS -rdynamic"
     DYN_CFLAGS="-fPIC"
     GC_THREADS_FLAG="-DGC_FREEBSD_THREADS"

src/racket/sconfig.h

@@ -320,7 +320,7 @@
 
   /************** x86/FreeBSD with gcc ****************/
 
-#if defined(__FreeBSD__)
+#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
  
 # if defined(__i386__)
 #  define SCHEME_PLATFORM_LIBRARY_SUBPATH "i386-freebsd"
@@ -914,12 +914,15 @@
 
 #ifndef FLAGS_ALREADY_SET
 
+/* assume generic Unix: */
+#include "uconfig.h"
+# define SIGSET_IS_SIGNAL
+# define SIGSET_NEEDS_REINSTALL
+
   /*********************/
  /* Operating System  */
 /*********************/
 
-#define SYSTEM_TYPE_NAME "unix"
-
   /* SYSTEM_TYPE_NAME must be a string; this will be converted into
      a symbol for the result of (system-type) */
 
@@ -932,11 +935,6 @@
  /* Language Features */
 /*********************/
 
-#define TIME_SYNTAX
-#define PROCESS_FUNCTION
-#define DIR_FUNCTION
-#define GETENV_FUNCTION
-
  /* TIME_SYNTAX adds the (time ...) syntax; this may need to be
      turned off for compilation on some systems.
     CLOCKS_PER_SEC relates the values returned by clock() to
@@ -976,9 +974,6 @@
  /*   Filesystem    */
 /*******************/
 
-#define UNIX_FILE_SYSTEM
-#define EXPAND_FILENAME_TILDE
-
  /* UNIX_FILE_SYSTEM indicates that filenames are as in Unix, with
     forward slash separators, ".." as the parent directory, "/" 
     as the root directory, and case-sensitivity */
@@ -1029,16 +1024,13 @@
    None of these flags are required, but char-ready? may return
    spurious #ts if they are set up incorrectly. */
 
-#define HAS_STANDARD_IOB
-#define FILES_HAVE_FDS
-#define USE_UNIX_SOCKETS_TCP
-#define CLOSE_ALL_FDS_AFTER_FORK
-
  /* HAS_STANDARD_IOB, HAS_GNU_IOB, HAS_CYGWIN_IOB, HAS_LINUX_IOB,
     HAS_BSD_IOB, and HAS_SCO_IOB are mutually exclusive; they describe
     how to read the FILE* structure to determine if there are
     available cached characters. */
 
+ /* USE_FD_PORTS uses Unix-style open(), etc., for file ports. */
+
  /* FILES_HAVE_FDS means that a FILE* is always associated with a
     file desciptor, which can be select-ed to see if there are
     pending bytes. Don't use this unless one of the HAS_<X>_IOB
@@ -1116,10 +1108,6 @@
 
 /* These are flags about the implementation of system, process, etc. */
 
-# define UNIX_PROCESSES
-# define SIGSET_IS_SIGNAL
-# define SIGSET_NEEDS_REINSTALL
-
  /* UNIX_PROCESSES implements the process functions for Unix; uses
     sigset() to install the signal handler. */
 
@@ -1288,10 +1276,6 @@
  /* Stack Maniuplations */
 /***********************/
 
-# define DO_STACK_CHECK
-# define UNIX_FIND_STACK_BOUNDS
-# define STACK_SAFETY_MARGIN 50000
-
  /* DO_STACK_CHECK checks for stack overflow during execution.
      Requires either UNIX_FIND_STACK_BOUNDS, USE_STACKAVAIL,
      MACOS_FIND_STACK_BOUNDS, or ASSUME_FIXED_STACK_SIZE. */
@@ -1327,8 +1311,6 @@
  /*   Dynamic Loading   */
 /***********************/
 
-#define UNIX_DYNAMIC_LOAD
-
  /* UNIX_DYNAMIC_LOAD implements dynamic extensions under Unix
      using dlopen(); you may have to add the -ldl flag in the LIBS 
      Makefile variable. The library doesn't exist under Linux without 
@@ -1406,8 +1388,6 @@
  /*    Miscellaneous    */
 /***********************/
 
-#define UNISTD_INCLUDE
-
  /* USE_MAP_ANON indicates that mmap should use BSD's MAP_ANON flag
     rather than trying to open /dev/zero */