Remove code detecting llvm.

theano/gof/cmodule.py

@@ -1472,33 +1472,6 @@ def gcc_version():
     return gcc_version_str
 
 
-def gcc_llvm():
-    """ Detect if the g++ version used is the llvm one or not.
-
-    It does not support all g++ parameters even if it supports many of them.
-    """
-    if gcc_llvm.is_llvm is None:
-        p = None
-        try:
-            p = call_subprocess_Popen(['g++', '--version'],
-                                      stdout=subprocess.PIPE,
-                                      stderr=subprocess.PIPE)
-            p.wait()
-            output = p.stdout.read() + p.stderr.read()
-        except OSError:
-            # Typically means g++ cannot be found.
-            # So it is not an llvm compiler.
-
-            # Normally this should not happen as we should not try to
-            # compile when g++ is not available. If this happens, it
-            # will crash later so supposing it is not llvm is "safe".
-            output = ''
-        del p
-        gcc_llvm.is_llvm = "llvm" in output
-    return gcc_llvm.is_llvm
-gcc_llvm.is_llvm = None
-
-
 class GCC_compiler(object):
     # The equivalent flags of --march=native used by g++.
     march_flags = None
@@ -1520,10 +1493,6 @@ class GCC_compiler(object):
         # http://en.gentoo-wiki.com/wiki/Safe_Cflags#-march.3Dnative
         # http://en.gentoo-wiki.com/wiki/Hardware_CFLAGS
         detect_march = GCC_compiler.march_flags is None
-        if detect_march and gcc_llvm():
-            detect_march = False
-            GCC_compiler.march_flags = []
-
         if detect_march:
             for f in cxxflags:
                 #If the user give an -march=X parameter, don't add one ourself