[Analyzer] Use CC environment variable to select analyzer path in SATestBuild

[dcoughlin]

Seems reasonable. Can you include a comment in the commit message about why this is needed?

Also, why did you choose an environment variable and not a flag?

[george.karpenkov]

@dcoughlin: yes. Either would work, I thought that CC=mycompiler ./blah was already quite idiomatic.

utils/analyzer/SATestBuild.py

def getSBOutputDirName(IsReferenceBuild) :
     else :
         return SBOutputDirName
 
 #------------------------------------------------------------------------------
 # Configuration setup.
 #------------------------------------------------------------------------------
 
 # Find Clang for static analysis.
+if 'CC' in os.environ:
+    Clang = os.environ['CC']
+else:
     Clang = which("clang", os.environ['PATH'])
 if not Clang:
     print "Error: cannot find 'clang' in PATH"
     sys.exit(-1)
 
 # Number of jobs.
 Jobs = int(math.ceil(detectCPUs() * 0.75))
 
 # Project map stores info about all the "registered" projects.