I'm trying to use LLVM's Clang compiler for Compile[ ] and running into a problem. The operating system is Windows 8.1 (64 bit) and the Mathematica version is 10.0.2

Needs["CCompilerDriver`"]
Needs["CCompilerDriver`GenericCCompiler`"]

$CCompiler = {"Compiler" -> GenericCCompiler,
   "CompilerInstallation" -> "C:/LLVM", 
   "CompilerName" -> "clang.exe"};

c = Compile[ {{x, _Real}, {n, _Integer}},
    Module[ {sum, inc}, sum = 1.0; inc = 1.0; 
    Do[inc = inc*x/i; sum = sum + inc, {i, n}]; sum], 
   CompilationTarget -> "C"]


LibraryFunction::libload: The function compiledFunction0 was not loaded from the file C:\Users\Frank\AppData\Roaming\Mathematica\ApplicationData\CCompilerDriver\BuildFolder\hplargedesktop-9156\compiledFunction0.dll. >>

Compile::nogen: A library could not be generated from the compiled function. >>

However, CreateExecutable works with the settings "Compiler" -> GenericCCompiler, "CompilerInstallation" -> "C:/LLVM", "CompilerName" -> "clang.exe"