Bump the minimum gfotran version to 5.3.0.

Reduced the installed gfortran version to the gcc 5 branch, effectively
matching the script-installed version to the minimum  version.

Author: Damian Rouson

install.sh

@@ -265,7 +265,7 @@ find_or_install()
         stack_push dependency_path "none" `./build $package --default --query-path` `./build gcc --default --query-path`
       else
         printf "yes.\n"
-        printf "$this_script: Checking whether $executable in PATH wraps gfortran version 5.1.0 or later... "
+        printf "$this_script: Checking whether $executable in PATH wraps gfortran version 5.3.0 or later... "
         $executable acceptable_compiler.f90 -o acceptable_compiler
         $executable print_true.f90 -o print_true
         acceptable=`./acceptable_compiler`
@@ -332,7 +332,7 @@ find_or_install()
       stack_push dependency_path "none"
 
     elif [[ "$package_in_path" == "true" ]]; then
-      printf "$this_script: Checking whether $executable in PATH is version 5.1.0 or later..."
+      printf "$this_script: Checking whether $executable in PATH is version 5.3.0 or later..."
       $executable -o acceptable_compiler acceptable_compiler.f90
       $executable -o print_true print_true.f90
       is_true=`./print_true`
@@ -712,7 +712,7 @@ print_header()
   clear
   echo ""
   echo "*** A default build of OpenCoarrays requires CMake 3.4.0 or later     ***"
-  echo "*** and MPICH 3.1.4 wrapping GCC Fortran (gfortran) 5.1.0 or later.   ***"
+  echo "*** and MPICH 3.1.4 wrapping GCC Fortran (gfortran) 5.3.0 or later.   ***"
   echo "*** Additionally, CMake, MPICH, and GCC have their own prerequisites. ***"
   echo "*** This script will check for most known requirements in your PATH   ***"
   echo "*** environment variable and in the default installation directory    ***"

install_prerequisites/acceptable_compiler.f90

@@ -35,5 +35,5 @@
 program main
   use iso_fortran_env, only : compiler_version
   implicit none
-  print *,compiler_version() >= "GCC version 5.1.0 "
+  print *,compiler_version() >= "GCC version 5.3.0 "
 end program

install_prerequisites/build

@@ -72,7 +72,7 @@ set_default_version()
   # See http://stackoverflow.com/questions/1494178/how-to-define-hash-tables-in-bash
   package_version=(
     "cmake:3.4.0"
-    "gcc:trunk"
+    "gcc:gcc-5-branch"
     "mpich:3.1.4"
     "wget:1.16.3"
     "flex:2.6.0"
@@ -304,12 +304,17 @@ download_if_necessary()
       # In this case, args="ls" and the list of available versions has been printed so we can move on.
       exit 1
     fi
-    if [ -f $download_path/$url_tail ] || [ -d $download_path/$url_tail ]; then
-      echo "Download succeeded. $url_tail is in the following location:"
-      echo "$download_path"
+    if [[ "$fetch" == "svn" ]]; then
+      search_path=$download_path/$version_to_build
+    else
+      search_path=$download_path/$url_tail
+    fi
+    if [ -f $search_path ] || [ -d $search_path ]; then
+      echo "Download succeeded. The $package_to_build source is in the following location:"
+      echo "$search_path"
     else
-      echo "Download failed: $url_tail is not in the following, expected location:"
-      echo "$download_path"
+      echo "Download failed. The $package_to_build source is not in the following, expected location:"
+      echo "$search_path"
       echo "Aborting. [exit 110]"
       exit 110
     fi
@@ -320,7 +325,7 @@ download_if_necessary()
 unpack_if_necessary()
 {
   if [[ $fetch == "svn" || $fetch == "git" ]]; then
-    package_source_directory=$url_tail
+    package_source_directory=$version_to_build
   else
     printf "Unpacking $url_tail. \n"
     printf "Unpack command: tar xf $url_tail \n"