check for sdl-config before using it, and present a more user-friendly

text if it isn't found


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@8314 a1c6a512-1295-4272-9138-f99709370657

tools/configure

@@ -62,6 +62,21 @@ checksoundcard () {
     fi # has codecs
 }
 
+# scan the $PATH for the given command
+findtool(){
+  file="$1"
+
+  IFS=":"
+  for path in $PATH
+  do
+    # echo "checks for $file in $path" >&2
+    if test -f "$path/$file"; then
+      echo "$path/$file"
+      return
+    fi
+  done
+}
+
 
 simcc () {
 
@@ -72,6 +87,18 @@ simcc () {
 
  output="rockboxui" # use this as default output binary name
 
+ if [ "$simver" = "sdl" ]; then
+     # generic sdl-config checker
+     sdl=`findtool sdl-config`
+
+     if [ -z "$sdl" ]; then
+         echo "configure didn't find sdl-config, which indicates that you"
+         echo "don't have SDL (properly) installed. Please correct and"
+         echo "re-run configure!"
+         exit
+     fi
+ fi
+
  case $uname in
    CYGWIN*)
    echo "Cygwin host detected"