remove defaultCompilers; always use CC from ~/.rake.json

.rake.json

 { "hosts": {
     "thunder": {
       "hostname": "thunder5.zmaw.de",
-      "dir": "/scratch/mpi/CC/mh0287/users/m300064/builds/remote"
+      "dir": "/scratch/mpi/CC/mh0287/users/m300064/builds/remote",
+      "CC": ["icpc", "icc", "clang", "clang++", "gcc", "g++"]
     },
     "luthien": {
       "hostname": "localhost",
@@ -37,22 +38,25 @@
   "builders": {
     "localCLANG_3.8_Debug": {
       "hostname": "luthien",
-      "CC": "clang",
-      "configureCall": "/home/ram/src/cdo/configure --with-netcdf CC=clang CFLAGS='-g -O0'",
+      "configureCall": "/home/ram/src/cdo/configure --with-netcdf --disable-openmp CC=clang CXX=clang++ CFLAGS='-g -O0'",
       "makeCall": "make -j 12",
       "sync": false
     },
     "localCLANG++_3.8_Debug": {
       "hostname": "luthien",
-      "CC": "clang",
-      "configureCall": "/home/ram/src/cdo/configure --with-netcdf --enable-cxx CC=clang CXX=clang++ CFLAGS='-g -O0'",
+      "configureCall": "/home/ram/src/cdo/configure --with-netcdf --disable-openmp --enable-cxx CC=clang CXX=clang++ CFLAGS='-g -O0'",
       "makeCall": "make -j 12",
       "sync": false
     },
     "mpipcCLANG": {
       "hostname": "mpipc",
-      "CC": "clang",
-      "configureCall": "./configure --with-netcdf=--with-netcdf=/sw/squeeze-x64/netcdf-4.2-static --disable-openmp CC=clang CFLAGS='-g -O2'",
+      "configureCall": "./configure --with-netcdf=/sw/squeeze-x64/netcdf-4.2-static --disable-openmp CC=clang CFLAGS='-g -O2'",
+      "makeCall": "make -j 12",
+      "sync": true
+    },
+    "localGCCInSourceNoOpenmp": {
+      "hostname": "luthien",
+      "configureCall": "./configure --disable-openmp CC=gcc CFLAGS='-g -O2'",
       "makeCall": "make -j 12",
       "sync": true
     }

Rakefile

@@ -17,8 +17,6 @@ end
 # get setup from the environment
 @debug               = true # == Rake.verbose ? true : false
 @user                = ENV['USER']
-# basic compilers handled by the default configuration: ./config/default
-@defaultCompilers    = %w[icpc icc clang clang++ gcc g++]
 # default configure call
 @defautConfigureCall = lambda {|cc| "./config/default CC=#{cc}"}
 # }}}
@@ -205,9 +203,9 @@ end
 # constuct builders out of user configuration {{{ ==============================
 Builder = Struct.new(:host,:hostname,:username,:compiler,:targetDir,:configureCall,:isLocal?)
 # 1) construct builders from host configuration
+#    this is what config/default should be able to handle
 @userConfig["hosts"].each {|host,config|
-  compilers = config.has_key?('CC') ? config['CC'] : @defaultCompilers
-  compilers.each {|cc|
+  config['CC'].each {|cc|
     builder = Builder.new(host,
                           config["hostname"],
                           ('localhost' == config['hostname']) \
@@ -217,7 +215,7 @@ Builder = Struct.new(:host,:hostname,:username,:compiler,:targetDir,:configureCa
                                  : @userConfig["remoteUser"]),
                           cc,
                           [config["dir"],cc,getBranchName].join(File::SEPARATOR),
-                          @defautConfigureCall[cc],
+                          "./config/default CC=#{cc}",
                           config["hostname"] == 'localhost')
     builder2task(builder)
   }
@@ -232,7 +230,7 @@ Builder = Struct.new(:host,:hostname,:username,:compiler,:targetDir,:configureCa
                             : ( config.has_key?('username') \
                                ? config['username'] \
                                : @userConfig["remoteUser"]),
-                        config["CC"],
+                        '', # CC can be empty here, because it should be set by the given configureCall
                         [@userConfig['hosts'][config['hostname']]['dir'],builderName,getBranchName].join(File::SEPARATOR),
                         config['configureCall'],
                         ( 'localhost' == config['hostname'] \