install_ocaml.sh corrected

install/scripts/install_ocaml.sh

@@ -13,18 +13,42 @@ export LIBRARY_PATH="${QP_ROOT}"/lib:"${LIBRARY_PATH}"
 export LD_LIBRARY_PATH="${QP_ROOT}"/lib:"${LD_LIBRARY_PATH}"
 
 # return 0 if program version is equal or greater than check version
-check_version()
-{
-    local version=$1 check=$2
-    local winner=$(echo -e "$version\n$check" | sed '/^$/d' | sort -nr | head -1)
-    [[ "$winner" = "$version" ]] && return 0
+check_version () {
+    if [[ $1 == $2 ]]
+    then
+        return 0
+    fi
+    local IFS=.
+    local i ver1=($1) ver2=($2)
+    # fill empty fields in ver1 with zeros
+    for ((i=${#ver1[@]}; i<${#ver2[@]}; i++))
+    do
+        ver1[i]=0
+    done
+    for ((i=0; i<${#ver1[@]}; i++))
+    do
+        if [[ -z ${ver2[i]} ]]
+        then
+            # fill empty fields in ver2 with zeros
+            ver2[i]=0
+        fi
+        if ((10#${ver1[i]} > 10#${ver2[i]}))
+        then
             return 1
+        fi
+        if ((10#${ver1[i]} < 10#${ver2[i]}))
+        then
+            return 2
+        fi
+    done
+    return 0
 }
 
+
 i=$(gcc -dumpversion)
 
-check_version i 4.6
-if [[ $? -ne 0 ]]
+check_version 4.6 $i 
+if [[ $? == 1 ]]
 then
    echo "GCC version $(gcc -dumpversion) too old. GCC >= 4.6 required."
    exit 1
@@ -53,6 +77,3 @@ NCPUs=$(cat /proc/cpuinfo  | grep -i  MHz | wc -l)
 ${QP_ROOT}/bin/opam install -j ${NCPUs} ${PACKAGES} -y -q || exit 1
 
 rm -f ../_build/ocaml.log
-exit 0
-
-