Driver: default to `unsigned int` `wchar_t` for ARM

AAPCS and AAPCS64 mandate that `wchar_t` with `-fno-short-wchar` is an
`unsigned int` rather than a `signed int`.  Ensure that the driver does
not flip the signedness of `wchar_t` for those targets.

Add additional tests to ensure that this does not regress.

llvm-svn: 316858

diff --git a/clang/lib/Driver/ToolChains/Clang.cpp b/clang/lib/Driver/ToolChains/Clang.cpp
index adaf39a..c1c8813 100644 (file)
--- a/clang/lib/Driver/ToolChains/Clang.cpp
+++ b/clang/lib/Driver/ToolChains/Clang.cpp
@@ -2622,8 +2622,13 @@ static void RenderCharacterOptions(const ArgList &Args, const llvm::Triple &T,
       CmdArgs.push_back("-fwchar-type=short");
       CmdArgs.push_back("-fno-signed-wchar");
     } else {
+      bool IsARM = T.isARM() || T.isThumb() || T.isAArch64();
       CmdArgs.push_back("-fwchar-type=int");
-      CmdArgs.push_back("-fsigned-wchar");
+      if (IsARM && !(T.isOSWindows() || T.getOS() == llvm::Triple::NetBSD ||
+                     T.getOS() == llvm::Triple::OpenBSD))
+        CmdArgs.push_back("-fno-signed-wchar");
+      else
+        CmdArgs.push_back("-fsigned-wchar");
     }
   }
 }

diff --git a/clang/test/Driver/arm-wchar_t-defaults.c b/clang/test/Driver/arm-wchar_t-defaults.c
new file mode 100644 (file)
index 0000000..8b2ae29
--- /dev/null
+++ b/clang/test/Driver/arm-wchar_t-defaults.c
@@ -0,0 +1,53 @@
+// RUN: %clang -### -target armv7-unknown-none-eabi -c %s -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-SHORT %s
+// RUN: %clang -### -target armv7-unknown-none-eabi -fno-short-wchar -c %s -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-LONG-UNSIGNED %s
+// RUN: %clang -### -target armv7-unknown-none-eabi -mthumb -c %s -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-SHORT %s
+// RUN: %clang -### -target armv7-unknown-none-eabi -mthumb -fno-short-wchar -c %s -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-LONG-UNSIGNED %s
+// RUN: %clang -### -target armv7eb-unknown-none-eabi -c %s -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-SHORT %s
+// RUN: %clang -### -target armv7eb-unknown-none-eabi -fno-short-wchar -c %s -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-LONG-UNSIGNED %s
+// RUN: %clang -### -target armv7eb-unknown-none-eabi -mthumb -c %s -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-SHORT %s
+// RUN: %clang -### -target armv7eb-unknown-none-eabi -mthumb -fno-short-wchar -c %s -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-LONG-UNSIGNED %s
+// RUN: %clang -### -target aarch64-unknown-none-eabi -c %s -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-SHORT %s
+// RUN: %clang -### -target aarch64-unknown-none-eabi -fno-short-wchar -c %s -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-LONG-UNSIGNED %s
+// RUN: %clang -### -target aarch64_be-unknown-none-eabi -c %s -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-SHORT %s
+// RUN: %clang -### -target aarch64_be-unknown-none-eabi -fno-short-wchar -c %s -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-LONG-UNSIGNED %s
+
+// RUN: %clang -### -target armv7-unknown-netbsd -c %s -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-SHORT %s
+// RUN: %clang -### -target armv7-unknown-netbsd -fno-short-wchar -c %s -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-LONG-SIGNED %s
+// RUN: %clang -### -target armv7-unknown-netbsd -mthumb -c %s -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-SHORT %s
+// RUN: %clang -### -target armv7-unknown-netbsd -mthumb -fno-short-wchar -c %s -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-LONG-SIGNED %s
+// RUN: %clang -### -target armv7eb-unknown-netbsd -c %s -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-SHORT %s
+// RUN: %clang -### -target armv7eb-unknown-netbsd -fno-short-wchar -c %s -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-LONG-SIGNED %s
+// RUN: %clang -### -target armv7eb-unknown-netbsd -mthumb -c %s -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-SHORT %s
+// RUN: %clang -### -target armv7eb-unknown-netbsd -mthumb -fno-short-wchar -c %s -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-LONG-SIGNED %s
+// RUN: %clang -### -target aarch64-unknown-netbsd -c %s -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-SHORT %s
+// RUN: %clang -### -target aarch64-unknown-netbsd -fno-short-wchar -c %s -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-LONG-SIGNED %s
+// RUN: %clang -### -target aarch64_be-unknown-netbsd -c %s -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-SHORT %s
+// RUN: %clang -### -target aarch64_be-unknown-netbsd -fno-short-wchar -c %s -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-LONG-SIGNED %s
+
+// RUN: %clang -### -target armv7-unknown-openbsd -c %s -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-SHORT %s
+// RUN: %clang -### -target armv7-unknown-openbsd -fno-short-wchar -c %s -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-LONG-SIGNED %s
+// RUN: %clang -### -target armv7-unknown-openbsd -mthumb -c %s -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-SHORT %s
+// RUN: %clang -### -target armv7-unknown-openbsd -mthumb -fno-short-wchar -c %s -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-LONG-SIGNED %s
+// RUN: %clang -### -target armv7eb-unknown-openbsd -c %s -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-SHORT %s
+// RUN: %clang -### -target armv7eb-unknown-openbsd -fno-short-wchar -c %s -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-LONG-SIGNED %s
+// RUN: %clang -### -target armv7eb-unknown-openbsd -mthumb -c %s -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-SHORT %s
+// RUN: %clang -### -target armv7eb-unknown-openbsd -mthumb -fno-short-wchar -c %s -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-LONG-SIGNED %s
+// RUN: %clang -### -target aarch64-unknown-openbsd -c %s -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-SHORT %s
+// RUN: %clang -### -target aarch64-unknown-openbsd -fno-short-wchar -c %s -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-LONG-SIGNED %s
+// RUN: %clang -### -target aarch64_be-unknown-openbsd -c %s -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-SHORT %s
+// RUN: %clang -### -target aarch64_be-unknown-openbsd -fno-short-wchar -c %s -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-LONG-SIGNED %s
+
+// RUN: %clang -### -target armv7-unknown-windows-msvc -c %s -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-SHORT %s
+// RUN: %clang -### -target armv7-unknown-windows-msvc -fno-short-wchar -c %s -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-LONG-SIGNED %s
+// RUN: %clang -### -target aarch64-unknown-windows-msvc -c %s -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-SHORT %s
+// RUN: %clang -### -target aarch64-unknown-windows-msvc -fno-short-wchar -c %s -o /dev/null 2>&1 | FileCheck -check-prefix CHECK-LONG-SIGNED %s
+
+// CHECK-SHORT-NOT: "-fwchar-type=int"
+// CHECK-SHORT-NOT: "-fno-signed-wchar"
+
+// CHECK-LONG-UNSIGNED: "-fwchar-type=int"
+// CHECK-LONG-UNSIGNED: "-fno-signed-wchar"
+
+// CHECK-LONG-SIGNED: "-fwchar-type=int"
+// CHECK-LONG-SIGNED: "-fsigned-wchar"
+