Adding missing installation script

script/detect_gcc

+#! /bin/bash
+
+function detect_gcc_or_clang()
+{
+    command -v $1 >/dev/null 2>&1
+    if [ $? -ne 0 ]; then
+      dgc_ret=0
+      return
+    fi
+
+    # First we try to understand if g++ command line is linked to clang
+    
+    $1 --version | grep "Apple LLVM"
+    if [ $? == 0 ]; then
+        echo "Apple LLVM based g++"
+
+        # we try the detect the version
+        major=$(g++ --version | grep LLVM | sed 's/.*\([0-9][0-9]*\)\.\([0-9][0-9]*\)\.\([0-9][0-9]*\).*(.*/\1/g')
+
+        # we check if the detection is garbage
+        echo "$major" | egrep -q '^[0-9]+$'
+        if [ $? == 0 ]; then
+           dgc_major=$($1 --version | grep LLVM | sed 's/.*\([0-9][0-9]*\)\.\([0-9][0-9]*\)\.\([0-9][0-9]*\).*(.*/\1/g')
+           dgc_middle=$($1 --version | grep LLVM | sed 's/.*\([0-9][0-9]*\)\.\([0-9][0-9]*\)\.\([0-9][0-9]*\).*(.*/\2/g')
+           dgc_minor=$($1 --version | grep LLVM | sed 's/.*\([0-9][0-9]*\)\.\([0-9][0-9]*\)\.\([0-9][0-9]*\).*(.*/\3/g')
+
+           if [ $dgc_major -gt 6 ]; then
+             echo -e "clang++ $dgc_major.$dgc_middle.$dgc_minor \033[92;1m SUCCESS \033[0m"
+             dgc_compiler=clang++
+             dgc_ret=1
+           elif [ $dgc_major -lt 6 ]; then
+             echo -e "clang++ $dgc_major.$dgc_middle.$dgc_minor \033[91;5;1m FAILED \033[0m your Apple clang $major.middle;$minor is too old, 6.1.0 or higher is required"
+             dgc_ret=0
+           elif [ $dgc_middle -gt 1  ]; then
+             echo -e "clang++ $dgc_major.$dgc_middle.$dgc_minor \033[92;1m SUCCESS \033[0m"
+             dgc_compiler=clang++
+             dgc_ret=1
+           elif [ $dgc_minor -lt 1 ]; then
+             echo -e "clang++ $dgc_major.$dgc_middle.$dgc_minor \033[91;5;1m FAILED \033[0m your Apple clang $major.middle;$minor is too old, 6.1.0 or higher is required"
+             dgc_ret=0
+           else
+             echo -e "Apple clang++ version $dgc_major.$dgc_middle.$dgc_minor \033[92;1m SUCCESS \033[0m"
+             dgc_compiler=clang++
+             dgc_ret=1
+           fi
+           return
+        fi
+        dgc_ret=2
+        return
+    fi
+
+    $1 --version | grep $1
+    if [ $? == 0 -a x"$1" == x"gcc" ]; then
+        dgc_major=$($1 --version | grep $1 | sed 's/.*\([0-9][0-9]*\)\.\([0-9][0-9]*\)\.\([0-9][0-9]*\).*/\1/g')
+        dgc_middle=$($1 --version | grep $1 | sed 's/.*\([0-9][0-9]*\)\.\([0-9][0-9]*\)\.\([0-9][0-9]*\).*/\2/g')
+        dgc_minor=$($1 --version | grep $1 | sed 's/.*\([0-9][0-9]*\)\.\([0-9][0-9]*\)\.\([0-9][0-9]*\).*/\3/g')
+
+        if [ $dgc_major -gt 4 ]; then
+          echo -e "$1 $dgc_major.$dgc_middle.$dgc_minor \033[92;1m SUCCESS \033[0m"
+          dgc_compiler=g++
+          dgc_ret=1
+        elif [ $dgc_major -lt 4 ]; then
+          echo -e "$1 $dgc_major.$dgc_middle.$dgc_minor  \033[91;5;1m FAILED \033[0m your g++ version is too old, 4.8.2 at least required"
+          dgc_ret=0
+        elif [ $dgc_middle -gt 8  ]; then
+          echo -e "$1 $dgc_major.$dgc_middle.$dgc_minor \033[92;1m SUCCESS \033[0m"
+          dgc_compiler=g++
+          dgc_ret=1
+        elif [ $dgc_middle -lt 8 ]; then
+          echo -e "$1 $dgc_major.$dgc_middle.$dgc_minor \033[91;5;1m FAILED \033[0m your g++ version is too old, 4.8.2 at least required"
+          dgc_ret=0
+        elif [ $dgc_minor -gt 1  ]; then
+          echo -e "$1 $dgc_major.$dgc_middle.$dgc_minor \033[92;1m SUCCESS \033[0m"
+          dgc_compiler=g++
+          dgc_ret=1
+        else
+          echo -e "$1 $dgc_major.$dgc_middle.$dgc_minor \033[92;1m FAILED \033[0m your g++ version is too old, 4.8.2 at least required"
+          dgc_ret=0
+        fi
+        return
+    fi
+
+    $1 --version | grep $1
+    if [ $? == 0 -a x"$1" == x"clang" ]; then
+        dgc_major=$($1 --version | grep $1 | sed 's/.*\([0-9][0-9]*\)\.\([0-9][0-9]*\)\.\([0-9][0-9]*\).*/\1/g')
+        dgc_middle=$($1 --version | grep $1 | sed 's/.*\([0-9][0-9]*\)\.\([0-9][0-9]*\)\.\([0-9][0-9]*\).*/\2/g')
+        dgc_minor=$($1 --version | grep $1 | sed 's/.*\([0-9][0-9]*\)\.\([0-9][0-9]*\)\.\([0-9][0-9]*\).*/\3/g')
+
+        if [ $dgc_major -gt 3 ]; then
+          echo -e "$1 $dgc_major.$dgc_middle.$dgc_minor \033[92;1m SUCCESS \033[0m"
+          dgc_compiler=clang++
+          dgc_ret=1
+        elif [ $dgc_major -lt 3 ]; then
+          echo -e "$1 $dgc_major.$dgc_middle.$dgc_minor  \033[91;5;1m FAILED \033[0m your clang version is too old 3.6.0 at least required"
+          dgc_ret=0
+        elif [ $dgc_middle -gt 6  ]; then
+          echo -e "$1 $dgc_major.$dgc_middle.$dgc_minor \033[92;1m SUCCESS \033[0m"
+          dgc_compiler=clang++
+          dgc_ret=1
+        elif [ $dgc_middle -lt 6 ]; then
+          echo -e "$1 $dgc_major.$dgc_middle.$dgc_minor \033[91;5;1m FAILED \033[0m your clang version is too old 3.6.0 at least required"
+          dgc_ret=0
+        else
+          echo -e "$1 $dgc_major.$dgc_middle.$dgc_minor \033[92;1m SUCCESS \033[0m"
+          dgc_compiler=clang++
+          dgc_ret=0
+        fi
+        return
+    fi
+
+
+    dgc_ret=0
+}
+
+

script/detect_osx

+#! /bin/bash
+
+function detect_osx()
+{
+    if [ x"$1" != x"osx" ]; then
+      return
+    fi
+
+    # Try first pattern
+
+    version=$(sw_vers | grep ProductVersion | sed 's/.*\([0-9][0-9]\)\.\([0-9][0-9]*\)\.\([0-9][0-9]*\).*/\1/g')
+    echo "$version" | egrep -q '^[0-9]+$'
+    if [ $? == 0 ]; then
+      dosx_major=$(sw_vers | grep ProductVersion | sed 's/.*\([0-9][0-9]\)\.\([0-9][0-9]*\)\.\([0-9][0-9]*\).*/\1/g')
+      dosx_middle=$(sw_vers | grep ProductVersion | sed 's/.*\([0-9][0-9]\)\.\([0-9][0-9]*\)\.\([0-9][0-9]*\).*/\2/g')
+      dosx_minor=$(sw_vers | grep ProductVersion | sed 's/.*\([0-9][0-9]\)\.\([0-9][0-9]*\)\.\([0-9][0-9]*\).*/\3/g')
+
+      if [ $dosx_major -gt 10 ]; then
+        dosx_ret=1
+      elif [ $dosx_major -lt 10 ]; then
+        dosx_ret=0
+      elif [ $dosx_middle -gt 10  ]; then
+        dosx_ret=1
+      elif [ $dosx_middle -lt 10 ]; then
+        dosx_ret=1
+      else
+        dosx_ret=0
+       fi
+    fi
+
+    version=$(sw_vers | grep ProductVersion | sed 's/.*\([0-9][0-9]\)\.\([0-9][0-9]*\).*/\1/g')
+    echo "$version" | egrep -q '^[0-9]+$'
+    if [ $? == 0 ]; then
+      dosx_major=$(sw_vers | grep ProductVersion | sed 's/.*\([0-9][0-9]\)\.\([0-9][0-9]*\).*/\1/g')
+      dosx_middle=$(sw_vers | grep ProductVersion | sed 's/.*\([0-9][0-9]\)\.\([0-9][0-9]*\).*/\2/g')
+
+      if [ $dosx_major -gt 10 ]; then
+        dosx_ret=1
+      elif [ $dosx_major -lt 10 ]; then
+        dosx_ret=0
+      elif [ $dosx_middle -gt 10  ]; then
+        dosx_ret=1
+      elif [ $dosx_middle -lt 10 ]; then
+        dosx_ret=1
+      else
+        dosx_ret=0
+      fi
+    fi
+}
+