Fix configure for windows simulator builds in cygwin / mingw cross-compiling environments.

Fixes and Changes to configure the Windows simulator builds mostly for cygwin / mingw cross-compiling environments:
  - fix CROSS_COMPILE values including detection for old and newer mingw
environments
  - fix detection of sdl-config by searching inside CROSS_COMPILE
sys-root
  - fix call of sdl-config and use correct (found) version
  - add possibility to build a 64-bit simulator
  - added several -Wno- options to GCCOPTS to prevent annoying compiler
warnings
  - use cross-compiler as HOST_CC if no "native" HOST_CC is available

Change-Id: Ib5dd288c3f9a11be9b66e53e3406eadfa65f7604

tools/configure

@@ -160,16 +160,41 @@ findtool(){
 # scan the $PATH for sdl-config - check whether for a (cross-)win32
 # sdl as requested
 findsdl(){
-  # sdl-config might (not) be prefixed for cross compiles so try both.
-  files="${CROSS_COMPILE}sdl-config:sdl-config"
+  files=sdl-config
+  if [ -n "$CROSS_COMPILE" ]; then
+    # sdl-config might (not) be prefixed for cross compiles so try both.
+    files="${CROSS_COMPILE}sdl-config:${files}"
+  fi
   winbuild="$1"
 
+  paths2check="$PATH"
+
+  if [ -n "$CROSS_COMPILE" ]; then
+    # add cross compile sys-root-directories to search in:
+    sysroot=$($CPP --print-sysroot 2>&1)
+    if [ $? -eq 0 ];
+    then
+      subdirs="bin:mingw/bin:sbin:mingw/sbin"
+      IFS=":"
+      for subdir in $subdirs
+      do
+        if [ -e "${sysroot}/${subdir}" ]; then
+          paths2check="${sysroot}/${subdir}:${paths2check}"
+        fi
+      done
+    else
+      echo "WARNING: unable to get sys-root directory from your cross-compiler" >&2
+      echo "WARNING: $CPP --print-sysroot returns" >&2
+      echo "WARNING: ${sysroot}" >&2
+    fi
+  fi
+
+  # search for the correct sdl-config
   IFS=":"
-  for file in $files
+  for path in $paths2check
   do
-    for path in $PATH
+    for file in $files
     do
-      #echo "checks for $file in $path" >&2
       if test -f "$path/$file"; then
         if [ "0" != `$path/$file --libs |grep -c mwindows` ]; then
           if [ "yes" = "${winbuild}" ]; then
@@ -258,10 +283,35 @@ simcc () {
  if [ "$win32crosscompile" = "yes" ]; then
    # We are crosscompiling
    # add cross-compiler option(s)
+   GCCOPTS="$GCCOPTS -Wno-format"
    LDOPTS="$LDOPTS -mconsole -static"
    output="$output.exe"
    winbuild="yes"
-   CROSS_COMPILE=${CROSS_COMPILE:-"i586-mingw32msvc-"}
+
+   if [ -z "$CROSS_COMPILE" ]; then
+     if [ "$win64" = "yes" ]; then
+       CROSS_COMPILE=${CROSS_COMPILE:-"x86_64-w64-mingw32-"}
+     else
+       # different possible names; try to find the correct one:
+       names="i686-w64-mingw32 i686-pc-mingw32 i586-mingw32msvc"
+
+       for name in $names
+       do
+         if which "${name}-gcc" >/dev/null 2>&1 ; then
+           CROSS_COMPILE="${name}-"
+           break
+         fi
+       done
+
+       if [ -z "$CROSS_COMPILE" ]; then
+         echo "WARNING: unable to find cross-compiler for 32-bit Windows environment!"
+         echo "WARNING: it's none of \"$names\"."
+         echo "WARNING: set your compiler prefix with CROSS_COMPILE=\"your-prefix-\" and"
+         echo "WARNING: re-run configure again!"
+         exit 2
+       fi
+     fi
+   fi
    SHARED_CFLAGS=''
    prefixtools "$CROSS_COMPILE"
    fibers=`check_fiber`
@@ -343,14 +393,18 @@ simcc () {
         echo "re-run configure!"
         exit 2
     else
+        echo Using $sdl
+
         # generic sdl-config checker
-        GCCOPTS="$GCCOPTS `$sdl --cflags`"
-        if sdl-config --static-libs > /dev/null 2>&1 ; then
-            LDOPTS="$LDOPTS `$sdl --static-libs`"
+        sdlccopts=$($sdl --cflags)
+        if $sdl --static-libs > /dev/null 2>&1 ; then
+          sdlldopts=$($sdl --static-libs)
         else
-            echo "Your sdl-config does not know about static libs, falling back to shared library"
-            LDOPTS="$LDOPTS `$sdl --libs`"
+          echo "Your sdl-config does not know about static libs, falling back to shared library"
+          sdlldopts=$($sdl --libs)
         fi
+        GCCOPTS="$GCCOPTS ${sdlccopts}"
+        LDOPTS="$LDOPTS ${sdlldopts}"
     fi
  fi
 
@@ -812,7 +866,7 @@ whichadvanced () {
     echo ""
     printf "Enter your developer options (press only enter when done)\n\
 (D)EBUG, (L)ogf, Boot(c)hart, (S)imulator, (P)rofiling, (V)oice, (W)in32 crosscompile,\n\
-(T)est plugins, S(m)all C lib, Logf to Ser(i)al port:"
+Win(6)4 crosscompile, (T)est plugins, S(m)all C lib, Logf to Ser(i)al port:"
     if [ "$modelname" = "archosplayer" ]; then
       printf ", Use (A)TA poweroff"
     fi
@@ -910,8 +964,14 @@ whichadvanced () {
         fi
         ;;
       [Ww])
-        echo "Enabling Windows 32 cross-compiling"
+        echo "Enabling Windows cross-compiling (32-bit)"
         win32crosscompile="yes"
+        win64=""
+        ;;
+      [6])
+        echo "Enabling Windows cross-compiling (64-bit)"
+        win32crosscompile="yes"
+        win64="yes"
         ;;
       "") # Match enter press when finished with advanced options
         cont=0
@@ -4272,6 +4332,9 @@ DLLTOOL=`findtool ${DLLTOOL} --lit`
 DLLWRAP=`findtool ${DLLWRAP} --lit`
 RANLIB=`findtool ${RANLIB} --lit`
 
+# in pure cross-compiler environments without own native compiler this helps:
+HOSTCC=${HOSTCC:-${CC}}
+HOSTAR=${HOSTAR:-${AR}}
 
 if [ -z "$arch" ]; then
     cpp_defines=$(echo "" | $CPP $GCCOPTS -dD)