commit 0b01e8d1d5cf0784779f3e607259381faeb9db5f
author Jian Cai <caij2003@gmail.com> Mon Oct 14 21:21:39 2019 +0000
committer Jian Cai <caij2003@gmail.com> Mon Oct 14 21:21:39 2019 +0000
tree 94caf82fd61043ba8c7fc9cd2ad16e66993eed89
parent 69f600ba846bf67f46bfec1b1dc0606e390ad157

Add support to -Wa,-W in clang

Currently clang does not support -Wa,-W, which suppresses warning
messages in GNU assembler. Add this option for gcc compatibility.
https://bugs.llvm.org/show_bug.cgi?id=43651

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@374822 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Driver/ToolChains/Clang.cpp

diff --git a/lib/Driver/ToolChains/Clang.cpp b/lib/Driver/ToolChains/Clang.cpp
index 52fe20c..dfb3f33 100644
--- a/lib/Driver/ToolChains/Clang.cpp
+++ b/lib/Driver/ToolChains/Clang.cpp
@@ -2140,7 +2140,7 @@
         CmdArgs.push_back("-msave-temp-labels");
       } else if (Value == "--fatal-warnings") {
         CmdArgs.push_back("-massembler-fatal-warnings");
-      } else if (Value == "--no-warn") {
+      } else if (Value == "--no-warn" || Value == "-W") {
         CmdArgs.push_back("-massembler-no-warn");
       } else if (Value == "--noexecstack") {
         UseNoExecStack = true;

test/Driver/as-w-option.c

diff --git a/test/Driver/as-w-option.c b/test/Driver/as-w-option.c
new file mode 100644
index 0000000..afaf1cf
--- /dev/null
+++ b/test/Driver/as-w-option.c
@@ -0,0 +1,14 @@
+// RUN: %clang -### %s -c -o tmp.o -fno-integrated-as -Wa,-W 2>&1 | FileCheck -check-prefix=CHECK-NOIAS %s
+// RUN: %clang -### %s -c -o tmp.o -integrated-as -Wa,-W 2>&1 | FileCheck -check-prefix=CHECK-IAS %s
+// RUN: %clang %s -c -o %t.o -integrated-as -Wa,-W 2>&1 | FileCheck -allow-empty --check-prefix=CHECK-AS-NOWARN %s
+// RUN: %clang %s -c -o %t.o -fno-integrated-as -Wa,-W 2>&1 | FileCheck -allow-empty --check-prefix=CHECK-AS-NOWARN %s
+// RUN: not %clang %s -c -o %t.o -integrated-as -Wa,--fatal-warnings 2>&1 | FileCheck --check-prefix=CHECK-AS-FATAL %s
+// RUN: not %clang %s -c -o %t.o -fno-integrated-as -Wa,--fatal-warnings 2>&1 | FileCheck --check-prefix=CHECK-AS-FATAL %s
+
+// CHECK-IAS: "-cc1" {{.*}} "-massembler-no-warn"
+// CHECK-NOIAS: "-W"
+// CHECK-AS-NOWARN-NOT: warning:
+// CHECK-AS-FATAL-NOT: warning:
+// CHECK-AS-FATAL: error
+
+__asm(".warning");