From: David Woodhouse <dwmw2@infradead.org>
Date: Tue, 21 Jan 2014 17:19:44 +0000 (+0000)
Subject: Add -m16 option for using x86-*-*-code16 triple
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=003a2d7ea5ecc442c52beee41f41e77db120f41c;p=clang

Add -m16 option for using x86-*-*-code16 triple

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@199754 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/include/clang/Driver/Options.td b/include/clang/Driver/Options.td
index 6682039e7e..5e8a3b89e2 100644
--- a/include/clang/Driver/Options.td
+++ b/include/clang/Driver/Options.td
@@ -951,6 +951,7 @@ def lazy__framework : Separate<["-"], "lazy_framework">, Flags<[LinkerInput]>;
 def lazy__library : Separate<["-"], "lazy_library">, Flags<[LinkerInput]>;
 def EL : Flag<["-"], "EL">, Flags<[DriverOption]>;
 def EB : Flag<["-"], "EB">, Flags<[DriverOption]>;
+def m16 : Flag<["-"], "m16">, Group<m_Group>, Flags<[DriverOption, CoreOption]>;
 def m32 : Flag<["-"], "m32">, Group<m_Group>, Flags<[DriverOption, CoreOption]>;
 def mqdsp6_compat : Flag<["-"], "mqdsp6-compat">, Group<m_Group>, Flags<[DriverOption,CC1Option]>,
   HelpText<"Enable hexagon-qdsp6 backward compatibility">;
diff --git a/lib/Driver/Driver.cpp b/lib/Driver/Driver.cpp
index ad938b8bd8..17e6bfd2cc 100644
--- a/lib/Driver/Driver.cpp
+++ b/lib/Driver/Driver.cpp
@@ -1900,13 +1900,22 @@ static llvm::Triple computeTargetTriple(StringRef DefaultTargetTriple,
       Target.getOS() == llvm::Triple::Minix)
     return Target;
 
-  // Handle pseudo-target flags '-m32' and '-m64'.
-  if (Arg *A = Args.getLastArg(options::OPT_m32, options::OPT_m64)) {
+  // Handle pseudo-target flags '-m64', '-m32' and '-m16'.
+  if (Arg *A = Args.getLastArg(options::OPT_m64, options::OPT_m32,
+                               options::OPT_m16)) {
     llvm::Triple::ArchType AT;
-    if (A->getOption().matches(options::OPT_m32))
-      AT = Target.get32BitArchVariant().getArch();
-    else
+    if (A->getOption().matches(options::OPT_m64))
       AT = Target.get64BitArchVariant().getArch();
+    else if (A->getOption().matches(options::OPT_m32))
+      AT = Target.get32BitArchVariant().getArch();
+    else if (A->getOption().matches(options::OPT_m16)) {
+      AT = Target.get32BitArchVariant().getArch();
+      if (AT == llvm::Triple::x86)
+        Target.setEnvironment(llvm::Triple::CODE16);
+      else
+        AT = llvm::Triple::UnknownArch;
+    }
+
     if (AT != llvm::Triple::UnknownArch)
       Target.setArch(AT);
   }
diff --git a/test/Driver/x86_m16.c b/test/Driver/x86_m16.c
new file mode 100644
index 0000000000..be15ff53c2
--- /dev/null
+++ b/test/Driver/x86_m16.c
@@ -0,0 +1,4 @@
+// RUN: %clang -target i386 -m16 -### -c %s 2>&1 | FileCheck %s
+
+// CHECK: Target: i386-{{.*}}-{{.*}}-code16
+