compilers: make sure cxx11_flag() is defined for all compilers

lib/spack/spack/compilers/clang.py

@@ -47,6 +47,17 @@ class Clang(Compiler):
                    'f77' : 'f77',
                    'fc'  : 'f90' }
 
+    @property
+    def cxx11_flag(self):
+        if ver.endswith('-apple'):
+            # FIXME: figure out from which version Apple's clang supports c++11
+            return "-std=c++11"
+        else:
+            if self.version < ver('3.3'):
+                tty.die("Only Clang 3.3 and above support c++11.")
+            else:
+                return "-std=c++11"
+
     @classmethod
     def default_version(self, comp):
         """The '--version' option works for clang compilers.

lib/spack/spack/compilers/nag.py

@@ -20,6 +20,12 @@ class Nag(Compiler):
                    'f77' : 'nag/nagfor',
                    'fc'  : 'nag/nagfor' }
 
+    @property
+    def cxx11_flag(self):
+        tty.die("cxx11_flag() is not implemented for nag. Consider creating a pull-request.")
+        return "-std=c++11"
+
+
     @classmethod
     def default_version(self, comp):
         """The '-V' option works for nag compilers.

lib/spack/spack/compilers/pgi.py

@@ -43,6 +43,12 @@ class Pgi(Compiler):
                    'f77' : 'pgi/pgfortran',
                    'fc'  : 'pgi/pgfortran' }
 
+    @property
+    def cxx11_flag(self):
+        tty.die("cxx11_flag() is not implemented for pgi. Consider creating a pull-request.")
+        return "-std=c++11"
+
+
     @classmethod
     def default_version(cls, comp):
         """The '-V' option works for all the PGI compilers.
@@ -54,4 +60,3 @@ def default_version(cls, comp):
         """
         return get_compiler_version(
             comp, '-V', r'pg[^ ]* ([^ ]+) \d\d\d?-bit target')
-