More fixes/improvements for OS/2.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_4_BRANCH@23159 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

configure.in

@@ -58,6 +58,7 @@ dnl ------------------------------------------------------------------------
 
 dnl assume Unix
 USE_UNIX=1
+USE_OS2=0
 USE_WIN32=0
 USE_DOS=0
 USE_BEOS=0
@@ -260,13 +261,13 @@ case "${host}" in
   ;;
 
   *-pc-os2_emx | *-pc-os2-emx )
+    USE_OS2=1
+    dnl Now both USE_OS2 and USE_UNIX should be set to 1 !!
     AC_DEFINE(__EMX__)
     PROGRAM_EXT=".exe"
     DEFAULT_DEFAULT_wxUSE_PM=1
     dnl "c++" wrapper is not always available, so always use plain gcc.
     CXX=gcc
-    dnl Explicitly link -lstdcpp, since we are using "gcc" not "g++"/"c++".
-    LIBS="$LIBS -lstdcpp"
     LDFLAGS="$LDFLAGS -Zcrtdll -Zsysv-signals"
   ;;
 
@@ -1353,6 +1354,8 @@ AC_PROG_LN_S
 dnl ---------------------------------------------------------------------------
 dnl When we are using gcc on OS/2, we want to be either using resources (PM)
 dnl or a more complete POSIX emulation for Motif/GTK+/X11
+dnl Moreover we need to link explicitly against either stdcpp.a or stdcxx.a
+dnl (depending on compiler version), since we are using "gcc", not "g++/c++".
 dnl ---------------------------------------------------------------------------
 dnl (OS/2-only piece)
 case "${host}" in
@@ -1367,6 +1370,26 @@ case "${host}" in
           dnl Include resources for the "native" port (wxPM).
           RESPROGRAMOBJ="\${top_srcdir}/include/wx/os2/wx.res"
       fi
+      AC_CACHE_CHECK([for gcc 3 or later], wx_cv_gcc3,[
+          AC_TRY_COMPILE([#include <features.h>],
+              [
+                  #if (__GNUC__ < 3)
+                      #error old gcc
+                  #endif
+              ],
+              [
+                  wx_cv_gcc3=yes
+              ],
+              [
+                  wx_cv_gcc3=no
+              ]
+          )
+      ])
+      if test "$wx_cv_gcc3" = "no"; then
+          LIBS="$LIBS -lstdcpp"
+      else
+          LIBS="$LIBS -lstdcxx"
+      fi
   ;;
 esac
 dnl (end of OS/2-only piece)
@@ -1418,7 +1441,7 @@ case "${host}" in
 esac
 
 if test "$wxUSE_GUI" = "yes"; then
-    if test "$wxUSE_UNIX" = "yes"; then
+    if test "$wxUSE_UNIX" = "yes" -a "$wxUSE_PM" != 1; then
         dnl defines HAVE_X11_XKBLIB_H
         AC_CHECK_HEADERS(X11/XKBlib.h)
     fi
@@ -3807,8 +3830,8 @@ else
             fi
         ;;
         *-pc-os2*emx )
-	    CFLAGS="$CFLAGS -Zmt"	
-	    CXXFLAGS="$CXXFLAGS -Zmt"	
+	    CFLAGS="$CFLAGS -Zmt -D__ST_MT_ERRNO__"	
+	    CXXFLAGS="$CXXFLAGS -Zmt -D__ST_MT_ERRNO__"	
 	    LDFLAGS="$LDFLAGS -Zmt"	
         ;;
       esac
@@ -4394,8 +4417,9 @@ dnl ------------------------------------------------------------------------
 dnl DLL support
 dnl ------------------------------------------------------------------------
 
-dnl under MSW we always have LoadLibrary/GetProcAddress
-if test "$TOOLKIT" != "MSW"; then
+dnl under MSW we always have LoadLibrary/GetProcAddress and
+dnl under OS/2 we always have DosLoadModule/DosQueryProcAddr
+if test "$TOOLKIT" != "MSW" -a "$USE_OS2" != 1; then
 
     HAVE_DL_FUNCS=0
     HAVE_SHL_FUNCS=0