MS-DOS cross-compilation w/ DJGPP

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@13027 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

configure.in

@@ -384,6 +384,7 @@ dnl ------------------------------------------------------------------------
 dnl assume Unix
 USE_UNIX=1
 USE_WIN32=0
+USE_DOS=0
 USE_BEOS=0
 USE_MAC=0
 
@@ -561,6 +562,15 @@ case "${host}" in
     DEFAULT_DEFAULT_wxUSE_MSW=1
   ;;
 
+  *-pc-msdosdjgpp )
+    USE_UNIX=0
+    USE_DOS=1
+    AC_DEFINE(__DOS__)
+    PROGRAM_EXT=".exe"
+    DEFAULT_DEFAULT_wxUSE_MGL=1
+    DEFAULT_DEFAULT_wxUSE_SHARED=0
+  ;;
+
   *-pc-os2_emx | *-pc-os2-emx )
     AC_DEFINE(__EMX__)
     PROGRAM_EXT=".exe"
@@ -1419,7 +1429,7 @@ AC_CACHE_SAVE
 dnl cross-compiling support: we're cross compiling if the build system is
 dnl different from the target one (assume host and target be always the same)
 if test "$build" != "$host" ; then
-    if test "$USE_WIN32" = 1 ; then
+    if test "$USE_WIN32" = 1 -o "$USE_DOS" = 1 ; then
         CC=$host_alias-gcc
         CXX=$host_alias-c++
         AR=$host_alias-ar
@@ -2031,8 +2041,6 @@ equivalent variable and GTK+ is version 1.2.3 or above.
     fi
 
     if test "$wxUSE_MGL" = 1; then
-        dnl FIXME_MGL - test for MGL's variants for freebsd etc.
-
         AC_MSG_CHECKING(for SciTech MGL library)
         if test "x$MGL_ROOT" = x ; then
             AC_MSG_RESULT(not found)
@@ -2041,7 +2049,19 @@ equivalent variable and GTK+ is version 1.2.3 or above.
             AC_MSG_RESULT($MGL_ROOT)
         fi
 
-        mgl_os=linux/gcc/glibc
+        dnl Find MGL library that we want
+        dnl FIXME_MGL - test for MGL variants for freebsd etc.
+        case "${host}" in
+            *-*-linux* )
+              mgl_os=linux/gcc/glibc
+              ;;
+            *-pc-msdosdjgpp )
+              mgl_os=dos32/dj2
+              ;;
+            *)
+              AC_MSG_ERROR(This system type ${host} is not yet supported by wxMGL.)
+        esac
+
         mgl_lib_type=""
 
         if test "$wxUSE_DEBUG_FLAG" = yes ; then
@@ -2254,7 +2274,7 @@ equivalent variable and GTK+ is version 1.2.3 or above.
 
     ALL_OBJECTS="${ALL_OBJECTS} \$(COMMONOBJS) \$(GENERICOBJS)"
 
-    if test "$TOOLKIT" != "MSW"; then
+    if test "$TOOLKIT" != "MSW" -a "$USE_DOS" != 1; then
         ALL_OBJECTS="${ALL_OBJECTS} \$(UNIXOBJS)"
     fi
 
@@ -2901,20 +2921,21 @@ AC_FUNC_VPRINTF
 
 dnl check for vsscanf() and vsnprintf() - on some platforms (Linux, glibc
 dnl 2.1.1 for the first one, HP-UX for the second) it's available in the
-dnl library but the prototype is missing, so we can't use AC_CHECK_FUNCS here,
+dnl library but the prototype is missing, so we can't use AC_CHECK_FUNCS() here,
-dnl do it manually
+dnl do it manually. We can't use AC_TRY_COMPILE(), either, because it doesn't
+dnl check if the symbol is available at linking time
 
-dnl we use AC_TRY_COMPILE() here instead of AC_TRY_RUN() to make the checks
+dnl we use AC_TRY_LINK() here instead of AC_TRY_RUN() to make the checks
-dnl work for cross-compilation, but AC_TRY_COMPILE() normally only compiles
+dnl work for cross-compilation, but AC_TRY_LINK() normally only compiles
 dnl one function while we need at least 2 - hence the ugly hack below. To
-dnl understand why it works, remember that AC_TRY_COMPILE() just prepends
+dnl understand why it works, remember that AC_TRY_LINK() just prepends
 dnl "int main() {" in the beginning of the code and "; return 0; }" at the
 dnl end...
 
 dnl if we fail to find vsnprintf, also try for _vsnprintf as that is what
 dnl we'll find under MSW if it exists.
 
-dnl final note: AC_TRY_COMPILE will only be executed if there is nothing in
+dnl final note: AC_TRY_LINK will only be executed if there is nothing in
 dnl the cache so we have to do AC_DEFINE(HAVE_VSNPRINTF) below and not inside
 dnl it or the symbol wouldn't be defined for the 2nd and subsequent configure
 dnl runs
@@ -2922,7 +2943,7 @@ dnl runs
 dnl check for vsnprintf() - a safe version of vsprintf()
 AC_CACHE_CHECK([for vsnprintf], wx_cv_func_vsnprintf,
 [
-  AC_TRY_COMPILE([
+  AC_TRY_LINK([
                     #include <stdio.h>
                     #include <stdarg.h>
                  ], [
@@ -2943,7 +2964,7 @@ AC_CACHE_CHECK([for vsnprintf], wx_cv_func_vsnprintf,
                  ], [
                     wx_cv_func_vsnprintf=yes
                  ], [
-                    AC_TRY_COMPILE([
+                    AC_TRY_LINK([
                                       #include <stdio.h>
                                       #include <stdarg.h>
                                    ], [
@@ -2972,7 +2993,7 @@ AC_CACHE_CHECK([for vsnprintf], wx_cv_func_vsnprintf,
 if test "$wx_cv_func_vsnprintf" = yes; then
     AC_DEFINE(HAVE_VSNPRINTF)
 else
-    AC_MSG_WARN(unsafe function sprintf will be used instead of snprintf)
+    AC_MSG_WARN(unsafe function vsprintf will be used instead of vsnprintf)
 fi
 
 dnl check for vsscanf()
@@ -3773,7 +3794,11 @@ if test "$wxUSE_DATETIME" = "yes"; then
                                             [
                                                 wx_cv_var_timezone=__timezone
                                             ],
-                                            AC_MSG_ERROR(no timezone variable)
+                                            [
+                                                if test "$USE_DOS" = 0 ; then
+                                                    AC_MSG_ERROR(no timezone variable)
+                                                fi
+                                            ]
                                         )
                                     ]
                                 )
@@ -3783,7 +3808,9 @@ if test "$wxUSE_DATETIME" = "yes"; then
     )
 
     dnl as we want $wx_cv_var_timezone to be expanded, use AC_DEFINE_UNQUOTED
-    AC_DEFINE_UNQUOTED(WX_TIMEZONE, $wx_cv_var_timezone)
+    if test "x$wx_cv_var_timezone" != x ; then
+        AC_DEFINE_UNQUOTED(WX_TIMEZONE, $wx_cv_var_timezone)
+    fi
 
     dnl check for localtime (it's POSIX, but the check can do no harm...)
     AC_CHECK_FUNCS(localtime)

setup.h.in

@@ -88,6 +88,9 @@
 /* PowerPC Darwin & Mac OS X */
 #undef __POWERPC__
 
+/* MS-DOS with DJGPP */
+#undef __DOS__
+
 /* Stupid hack; __WINDOWS__ clashes with wx/defs.h */
 #ifndef __WINDOWS__
 #undef __WINDOWS__