Added new autoconf test for i386 code16/code32 support. The guts of the

test were suggested by Ian Taylor <ian@airs.com> and Joel did the
hard part of putting it in aclocal and editting all the offending
Makefiles and source code which could use this feature.

aclocal.m4

@@ -1,6 +1,8 @@
 dnl aclocal.m4 generated automatically by aclocal 1.2
 
+dnl
 dnl $Id$
+dnl
 
 dnl macro to detect mkdir
 AC_DEFUN(RTEMS_PATH_MKDIR,
@@ -40,7 +42,9 @@ AC_MSG_RESULT($rtems_cv_prog_MKDIR_M)
 ])
 
 
+dnl
 dnl $Id$
+dnl
 
 dnl canonicalize target name
 dnl NOTE: Most rtems targets do not fullfil autoconf's
@@ -56,6 +60,9 @@ changequote([, ])dnl
 AC_MSG_RESULT($target_cpu)
 ])
 
+dnl
+dnl  $Id$
+dnl 
 dnl Set program_prefix
 dnl
 dnl 98/05/20 Ralf Corsepius	(corsepiu@faw.uni-ulm.de)
@@ -259,6 +266,7 @@ unset ac_cv_prog_cxx_works
 unset ac_cv_prog_cxx_cross
 ])
 
+dnl
 dnl $Id$
 dnl
 dnl Set target tools
@@ -355,6 +363,10 @@ dnl NOTE: These may not be available if not using gnutools
   RTEMS_PATH_TOOL(SIZE_FOR_TARGET,size,no)
 ])
 
+dnl
+dnl $Id$
+dnl
+
 AC_DEFUN(RTEMS_AR_FOR_TARGET_S,
 [
 AC_CACHE_CHECK(whether $AR_FOR_TARGET -s works,
@@ -377,6 +389,33 @@ fi
 ])
 
 
+dnl
+dnl  $Id$
+dnl 
+
+dnl check for i386 gas supporting 16 bit mode
+
+AC_DEFUN(RTEMS_I386_GAS_CODE16,
+  if test "${target_cpu}" = "i386"; then
+    AC_CACHE_CHECK([for 16 bit mode assembler support],
+      rtems_cv_prog_gas_code16,
+      [cat > conftest.s << EOF
+         .code16
+         data32 addr32 lgdt 0
+EOF
+      if AC_TRY_COMMAND($AS_FOR_TARGET -o conftest.o conftest.s); then
+        rtems_cv_prog_gas_code16=yes
+      else
+        rtems_cv_prog_gas_code16=no
+      fi])
+    RTEMS_GAS_CODE16="$rtems_cv_prog_gas_code16"
+  fi
+)
+
+
+dnl
+dnl  $Id$
+dnl 
 dnl Detect the Cygwin32 environment (unix under Win32)
 dnl
 dnl 98/06/16 David Fiddes   	(D.J.Fiddes@hw.ac.uk)
@@ -396,6 +435,9 @@ CYGWIN32=
 test "$rtems_cv_cygwin32" = yes && CYGWIN32=yes])
 
 
+dnl
+dnl  $Id$
+dnl 
 dnl Set the EXE extension
 dnl
 dnl 98/06/16 David Fiddes   	(D.J.Fiddes@hw.ac.uk)
@@ -529,7 +571,9 @@ rtems_cv_sysv_msg="yes", rtems_cv_sysv_msg="no", :)
 ])
 ])
 
+dnl
 dnl $Id$
+dnl
 
 dnl RTEMS_CHECK_MAKEFILE(path)
 dnl Search for Makefile.in's within the directory starting
@@ -540,12 +584,15 @@ AC_DEFUN(RTEMS_CHECK_MAKEFILE,
 [RTEMS_CHECK_FILES_IN($1,Makefile,makefiles)
 ])
 
+dnl
 dnl $Id$
+dnl
 
 dnl RTEMS_CHECK_FILES_IN(path,file,var)
 dnl path .. path relative to srcdir, where to start searching for files
 dnl file .. name of the files to search for
 dnl var  .. shell variable to append files found
+
 AC_DEFUN(RTEMS_CHECK_FILES_IN,
 [
 AC_MSG_CHECKING(for $2.in in $1)

aclocal/i386-gas-code16.m4

@@ -3,6 +3,7 @@ dnl  $Id$
 dnl 
 
 dnl check for i386 gas supporting 16 bit mode
+dnl     - binutils 2.9.1.0.7 and higher
 
 AC_DEFUN(RTEMS_I386_GAS_CODE16,
   if test "${target_cpu}" = "i386"; then
@@ -17,9 +18,7 @@ EOF
       else
         rtems_cv_prog_gas_code16=no
       fi])
-    if test "$rtems_cv_prog_gas_code16" = "yes"; then
+    RTEMS_GAS_CODE16="$rtems_cv_prog_gas_code16"
-      AC_DEFINE(RTEMS_PROG_GAS_CODE16)
-    fi
   fi
 )
 

c/src/lib/libbsp/i386/i386ex/start/Makefile.in

@@ -7,6 +7,7 @@ srcdir = @srcdir@
 VPATH = @srcdir@
 RTEMS_ROOT = @top_srcdir@
 PROJECT_ROOT = @PROJECT_ROOT@
+RTEMS_GAS_CODE16 = @RTEMS_GAS_CODE16@
 
 PGMS=${ARCH}/start.o
 
@@ -32,7 +33,9 @@ include $(RTEMS_ROOT)/make/leaf.cfg
 # (OPTIONAL) Add local stuff here using +=
 #
 
-DEFINES  +=
+ifeq ($(RTEMS_GAS_CODE16),yes)
+DEFINES  += -DNEXT_GAS
+endif
 CPPFLAGS +=
 CFLAGS   +=
 

c/src/lib/libbsp/i386/i386ex/start/start.s

@@ -40,12 +40,9 @@ changes:
 #include "80386ex.inc"
 
 /*
- * Needed for binutils 2.9.1.0.7 and higher
+ * NEXT_GAS Needed for binutils 2.9.1.0.7 and higher
- * #define NEXT_GAS
  */			
 
-#define NEXT_GAS
-	
         EXTERN (boot_card)         /* exits to bspstart   */ 
 	EXTERN (stack_start)       /* defined in startup/linkcmds */
 	EXTERN (Clock_exit)

c/src/lib/libbsp/i386/i386ex/startup/Makefile.in

@@ -37,7 +37,7 @@ include $(RTEMS_ROOT)/make/leaf.cfg
 #
 
 #DEFINES  += -DPRINTON
-DEFINES  += -I$(srcdir) 
+DEFINES  += -I$(srcdir)
 CPPFLAGS +=
 CFLAGS   += -g 
 

c/src/lib/libbsp/i386/pc386/start/Makefile.in

@@ -7,6 +7,7 @@ srcdir = @srcdir@
 VPATH = @srcdir@
 RTEMS_ROOT = @top_srcdir@
 PROJECT_ROOT = @PROJECT_ROOT@
+RTEMS_GAS_CODE16 = @RTEMS_GAS_CODE16@
 
 PGMS=${ARCH}/start.o ${ARCH}/start16.bin
 
@@ -32,7 +33,9 @@ include $(RTEMS_ROOT)/make/leaf.cfg
 # (OPTIONAL) Add local stuff here using +=
 #
 
-DEFINES  +=
+ifeq ($(RTEMS_GAS_CODE16),yes)
+DEFINES  += -DNEXT_GAS
+endif
 CPPFLAGS +=
 CFLAGS   +=
 

configure.in

@@ -227,6 +227,9 @@ fi
 
 RTEMS_CANONICALIZE_TOOLS
 
+dnl if this is an i386, does gas have good code16 support?
+RTEMS_I386_GAS_CODE16
+
 dnl check host cc
 AC_PROG_CC
 
@@ -439,6 +442,7 @@ AC_ARG_ENABLE(hwapi, \
   AC_MSG_RESULT(no)
 )
 
+AC_SUBST(RTEMS_GAS_CODE16)
 AC_SUBST(rtems_cv_prog_cc_cross)
 AC_SUBST(RTEMS_BSP_LIST)
 AC_SUBST(RTEMS_HOST)