Support -masm= flag for x86 targets.

`clang -S -o - file.c -masm=att` will write assembly to stdout in at&t syntax
(the default), `-masm=intel` will instead output intel style asm.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@208683 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/clang/Driver/Options.td b/include/clang/Driver/Options.td
index 2cd7a216d0aa3f9c67b124be8acde8400fef44d0..0e251aa6b145f3a9b7fd4d64f25217cc96f910c9 100644 (file)
--- a/include/clang/Driver/Options.td
+++ b/include/clang/Driver/Options.td
@@ -1005,6 +1005,7 @@ def m3dnow : Flag<["-"], "m3dnow">, Group<m_x86_Features_Group>;
 def m64 : Flag<["-"], "m64">, Group<m_Group>, Flags<[DriverOption, CoreOption]>;
 def mabi_EQ : Joined<["-"], "mabi=">, Group<m_Group>;
 def march_EQ : Joined<["-"], "march=">, Group<m_Group>;
+def masm_EQ : Joined<["-"], "masm=">, Group<m_Group>, Flags<[DriverOption]>;
 def mcmodel_EQ : Joined<["-"], "mcmodel=">, Group<m_Group>;
 def mconstant_cfstrings : Flag<["-"], "mconstant-cfstrings">, Group<clang_ignored_m_Group>;
 def mcpu_EQ : Joined<["-"], "mcpu=">, Group<m_Group>;

diff --git a/lib/Driver/Tools.cpp b/lib/Driver/Tools.cpp
index fcd1275d6ba2b488f048aeb0f08add2e7da1652e..1f9e12bb538b954b556edc4a4deed2c5446eaee8 100644 (file)
--- a/lib/Driver/Tools.cpp
+++ b/lib/Driver/Tools.cpp
@@ -1486,6 +1486,17 @@ void Clang::AddX86TargetArgs(const ArgList &Args,
   }
   if (NoImplicitFloat)
     CmdArgs.push_back("-no-implicit-float");
+
+  if (Arg *A = Args.getLastArg(options::OPT_masm_EQ)) {
+    StringRef Value = A->getValue();
+    if (Value == "intel" || Value == "att") {
+      CmdArgs.push_back("-mllvm");
+      CmdArgs.push_back(Args.MakeArgString("-x86-asm-syntax=" + Value));
+    } else {
+      getToolChain().getDriver().Diag(diag::err_drv_unsupported_option_argument)
+          << A->getOption().getName() << Value;
+    }
+  }
 }
 
 static inline bool HasPICArg(const ArgList &Args) {

diff --git a/test/Driver/masm.c b/test/Driver/masm.c
new file mode 100644 (file)
index 0000000..e9e4422
--- /dev/null
+++ b/test/Driver/masm.c
@@ -0,0 +1,12 @@
+// RUN: %clang -target i386-unknown-linux -masm=intel %s -S -o - | FileCheck --check-prefix=CHECK-INTEL %s
+// RUN: %clang -target i386-unknown-linux -masm=att %s -S -o - | FileCheck --check-prefix=CHECK-ATT %s
+// RUN: not %clang -target i386-unknown-linux -masm=somerequired %s -S -o - 2>&1 | FileCheck --check-prefix=CHECK-SOMEREQUIRED %s
+// RUN: %clang -target arm-unknown-eabi -masm=intel %s -S -o - 2>&1 | FileCheck --check-prefix=CHECK-ARM %s
+
+int f() {
+// CHECK-ATT: movl     $0, %eax
+// CHECK-INTEL: mov    eax, 0
+// CHECK-SOMEREQUIRED: error: unsupported argument 'somerequired' to option 'masm='
+// CHECK-ARM: warning: argument unused during compilation: '-masm=intel'
+  return 0;
+}