Driver: hoist the `wchar_t` handling to the driver
Move the logic for determining the `wchar_t` type information into the
driver. Rather than passing the single bit of information of
`-fshort-wchar` indicate to the frontend the desired type of `wchar_t`
through a new `-cc1` option of `-fwchar-type` and indicate the
signedness through `-f{,no-}signed-wchar`. This replicates the current
logic which was spread throughout Basic into the
`RenderCharacterOptions`.
Most of the changes to the tests are to ensure that the frontend uses
the correct type. Add a new test set under `test/Driver/wchar_t.c` to
ensure that we calculate the proper types for the various cases.
llvm-svn: 315126
diff --git a/clang/lib/Basic/TargetInfo.cpp b/clang/lib/Basic/TargetInfo.cpp
index de26a67..9b736d1 100644
--- a/clang/lib/Basic/TargetInfo.cpp
+++ b/clang/lib/Basic/TargetInfo.cpp
@@ -19,6 +19,7 @@
#include "llvm/ADT/APFloat.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/TargetParser.h"
#include <cstdlib>
using namespace clang;
@@ -290,8 +291,15 @@
void TargetInfo::adjust(LangOptions &Opts) {
if (Opts.NoBitFieldTypeAlign)
UseBitFieldTypeAlignment = false;
- if (Opts.ShortWChar)
- WCharType = UnsignedShort;
+
+ switch (Opts.WCharSize) {
+ default: llvm_unreachable("invalid wchar_t width");
+ case 0: break;
+ case 1: WCharType = Opts.WCharIsSigned ? SignedChar : UnsignedChar; break;
+ case 2: WCharType = Opts.WCharIsSigned ? SignedShort : UnsignedShort; break;
+ case 4: WCharType = Opts.WCharIsSigned ? SignedInt : UnsignedInt; break;
+ }
+
if (Opts.AlignDouble) {
DoubleAlign = LongLongAlign = 64;
LongDoubleAlign = 64;