r257984 - [Cygwin] Use -femulated-tls by default since r257718 introduced the new pass.

[NAKAMURA Takumi via cfe-commits]

Author: chapuni
Date: Fri Jan 15 21:44:52 2016
New Revision: 257984

URL: http://llvm.org/viewvc/llvm-project?rev=257984&view=rev
Log:
[Cygwin] Use -femulated-tls by default since r257718 introduced the new pass.

FIXME: Add more targets to use emutls into clang/test/Driver/emulated-tls.cpp.
FIXME: Add cygwin tests into llvm/test/CodeGen/X86. Working in progress.

Added:
    cfe/trunk/test/Driver/emulated-tls.cpp
Modified:
    cfe/trunk/docs/ReleaseNotes.rst
    cfe/trunk/lib/Driver/Tools.cpp

Modified: cfe/trunk/docs/ReleaseNotes.rst
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/docs/ReleaseNotes.rst?rev=257984&r1=257983&r2=257984&view=diff
==============================================================================
--- cfe/trunk/docs/ReleaseNotes.rst (original)
+++ cfe/trunk/docs/ReleaseNotes.rst Fri Jan 15 21:44:52 2016
@@ -74,6 +74,8 @@ Windows Support
 
 Clang's support for building native Windows programs ...
 
+TLS is enabled for Cygwin defaults to -femulated-tls.
+
 
 C Language Changes in Clang
 ---------------------------

Modified: cfe/trunk/lib/Driver/Tools.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Driver/Tools.cpp?rev=257984&r1=257983&r2=257984&view=diff
==============================================================================
--- cfe/trunk/lib/Driver/Tools.cpp (original)
+++ cfe/trunk/lib/Driver/Tools.cpp Fri Jan 15 21:44:52 2016
@@ -4597,7 +4597,7 @@ void Clang::ConstructJob(Compilation &C,
   Args.AddLastArg(CmdArgs, options::OPT_fno_operator_names);
   // Emulated TLS is enabled by default on Android, and can be enabled manually
   // with -femulated-tls.
-  bool EmulatedTLSDefault = Triple.isAndroid();
+  bool EmulatedTLSDefault = Triple.isAndroid() || Triple.isWindowsCygwinEnvironment();
   if (Args.hasFlag(options::OPT_femulated_tls, options::OPT_fno_emulated_tls,
                    EmulatedTLSDefault))
     CmdArgs.push_back("-femulated-tls");

Added: cfe/trunk/test/Driver/emulated-tls.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/Driver/emulated-tls.cpp?rev=257984&view=auto
==============================================================================
--- cfe/trunk/test/Driver/emulated-tls.cpp (added)
+++ cfe/trunk/test/Driver/emulated-tls.cpp Fri Jan 15 21:44:52 2016
@@ -0,0 +1,5 @@
+// Cygwin uses emutls. Clang should pass -femulated-tls to cc1 and cc1 should pass EmulatedTLS to LLVM CodeGen.
+// FIXME: Add more targets here to use emutls.
+// RUN: %clang -### -std=c++11 -target i686-pc-cygwin %s 2>&1 | FileCheck %s
+
+// CHECK: "-cc1" {{.*}}"-femulated-tls"