Windows: Add support for unicode command lines

Summary:
The MSVCRT deliberately sends main() code-page specific characters.
This isn't too useful to LLVM as we end up converting the arguments to
UTF-16 and subsequently attempt to use the result as, for example, a
file name.  Instead, we need to have the ability to access the Unicode
command line and transform it to UTF-8.

This has the distinct advantage over using the MSVC-specific wmain()
function as our entry point because:
 - It doesn't work on cygwin.
 - It only work on MinGW with caveats and only then on certain versions.
 - We get to keep our entry point as main(). :)

N.B.  This patch includes fixes to other parts of lib/Support/Windows
s.t. we would be able to take advantage of getting the Unicode paths.
E.G.  clang spawning clang -cc1 would want to give it Unicode arguments.

Reviewers: aaron.ballman, Bigcheese, rnk, ruiu

Reviewed By: rnk

CC: llvm-commits, ygao

Differential Revision: http://llvm-reviews.chandlerc.com/D1834

llvm-svn: 192069

1 files changed, 1 insertions, 1 deletions

diff --git a/llvm/lib/Support/Windows/Signals.inc b/llvm/lib/Support/Windows/Signals.inc
index bce83b96868..2b4a66d0089 100644
--- a/llvm/lib/Support/Windows/Signals.inc
+++ b/llvm/lib/Support/Windows/Signals.inc
@@ -135,7 +135,7 @@ typedef PVOID (WINAPI *fpSymFunctionTableAccess64)(HANDLE, DWORD64);
 static fpSymFunctionTableAccess64 SymFunctionTableAccess64;
 
 static bool load64BitDebugHelp(void) {
-  HMODULE hLib = ::LoadLibrary("Dbghelp.dll");
+  HMODULE hLib = ::LoadLibrary(TEXT("Dbghelp.dll"));
   if (hLib) {
     StackWalk64 = (fpStackWalk64)
                       ::GetProcAddress(hLib, "StackWalk64");