Made it possible to set CC and CXX on commandline before calling script

for those cases when gcc, cc-5.0, icpc or icc isn't in the path.

Fixed handling of 32 and 64 bits.

Downgraded Solaris builds on Forte to use -xO2 rather than -xO3.

Made it possible to build 64-bits on Mac OS X

Fixed some bugs in setting CC, CXX, ASFLAGS, LDFLAGS

Fixed bugs relating to use of SunStudio/Forte in check-cpu

Reorganized code a bit

Removed the use of --with-fast-mutexes since they aren't really
fast, rather slow.

Added -static-libgcc when using gcc

Added optimising compilation flags on BSD

Added use of curses library on Solaris

Removed the use of MY_ATOMIC_MODE_RWLOCKS which removed use of
atomic instructions

Added support for Forte on Solaris/x86

BUILD/check-cpu

@@ -175,67 +175,69 @@ check_cpu () {
     cc=$CC
   fi
 
-  cc_ver=`$cc --version | sed 1q`
-  cc_verno=`echo $cc_ver | sed -e 's/^.*(GCC)//g; s/[^0-9. ]//g;	 s/^ *//g; s/ .*//g'`
-  set -- `echo $cc_verno | tr '.' ' '`
-  cc_major=$1
-  cc_minor=$2
-  cc_patch=$3
-  cc_comp=`expr $cc_major '*' 100 '+' $cc_minor`
+  if test "x$compiler" = "x" ; then
+    cc_ver=`$cc --version | sed 1q`
+    cc_verno=`echo $cc_ver | sed -e 's/^.*(GCC)//g; s/[^0-9. ]//g;	 s/^ *//g; s/ .*//g'`
+    set -- `echo $cc_verno | tr '.' ' '`
+    cc_major=$1
+    cc_minor=$2
+    cc_patch=$3
+    cc_comp=`expr $cc_major '*' 100 '+' $cc_minor`
   
-  case "$cc_ver--$cc_verno" in
-    *GCC*)
-        # different gcc backends (and versions) have different CPU flags
-        case `gcc -dumpmachine` in
-          i?86-* | x86_64-*)
-	    if test "$cc_comp" -lt 304 ; then
-              check_cpu_cflags="-mcpu=${cpu_arg}"
-            elif test "$cc_comp" -ge 402 ; then
-              check_cpu_cflags="-mtune=native"
-            else
-              check_cpu_cflags="-mtune=${cpu_arg}"
-            fi
-            ;;
-          ppc-*)
-              check_cpu_cflags="-mcpu=${cpu_arg} -mtune=${cpu_arg}"
-            ;;
-          *)
-            check_cpu_cflags=""
-            return
-            ;;
-        esac
-      ;;
-    2.95.*)
-      # GCC 2.95 doesn't expose its name in --version output
-      check_cpu_cflags="-m${cpu_arg}"
-      ;;
-    *)
-      check_cpu_cflags=""
-      return
-      ;;
-  esac
+    case "$cc_ver--$cc_verno" in
+      *GCC*)
+          # different gcc backends (and versions) have different CPU flags
+          case `gcc -dumpmachine` in
+            i?86-* | x86_64-*)
+	      if test "$cc_comp" -lt 304 ; then
+                check_cpu_cflags="-mcpu=${cpu_arg}"
+              elif test "$cc_comp" -ge 402 ; then
+                check_cpu_cflags="-mtune=native"
+              else
+                check_cpu_cflags="-mtune=${cpu_arg}"
+              fi
+              ;;
+            ppc-*)
+                check_cpu_cflags="-mcpu=${cpu_arg} -mtune=${cpu_arg}"
+              ;;
+            *)
+              check_cpu_cflags=""
+              return
+              ;;
+          esac
+        ;;
+      2.95.*)
+        # GCC 2.95 doesn't expose its name in --version output
+        check_cpu_cflags="-m${cpu_arg}"
+        ;;
+      *)
+        check_cpu_cflags=""
+        return
+        ;;
+    esac
+    # now we check whether the compiler really understands the cpu type
+    touch __test.c
 
-  # now we check whether the compiler really understands the cpu type
-  touch __test.c
+    while [ "$cpu_arg" ] ; do
+      printf "testing $cpu_arg ... " >&2
+           
+      # compile check
+      eval "$cc -c $check_cpu_cflags __test.c" 2>/dev/null
+      if test "x$?" = "x0" ; then
+        echo ok >&2
+        break;
+      fi
 
+      echo failed >&2
+      check_cpu_cflags=""
+      break;
+    done
+    rm __test.*
+  fi
   if test "x$core2" = "xyes" ; then
     cpu_arg="core2"
   fi
-  while [ "$cpu_arg" ] ; do
-    printf "testing $cpu_arg ... " >&2
-          
-    # compile check
-    eval "$cc -c $check_cpu_cflags __test.c" 2>/dev/null
-    if test "x$?" = "x0" ; then
-      echo ok >&2
-      break;
-    fi
-
-    echo failed >&2
-    check_cpu_cflags=""
-    break;
-  done
-  rm __test.*
+  return 0
 }
  
 check_cpu