[clang] Enable -mms-bitfields by default for mingw targets

This matches GCC, which enabled -mms-bitfields by default for
mingw targets in 4.7 [1].

[1] https://www.gnu.org/software/gcc/gcc-4.7/changes.html

Differential Revision: https://reviews.llvm.org/D81795

diff --git a/clang/lib/Driver/ToolChains/Clang.cpp b/clang/lib/Driver/ToolChains/Clang.cpp
index 23ffc21..0ff8d12 100644 (file)
--- a/clang/lib/Driver/ToolChains/Clang.cpp
+++ b/clang/lib/Driver/ToolChains/Clang.cpp
@@ -4679,7 +4679,7 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
     CmdArgs.push_back("-fforbid-guard-variables");
 
   if (Args.hasFlag(options::OPT_mms_bitfields, options::OPT_mno_ms_bitfields,
-                   false)) {
+                   Triple.isWindowsGNUEnvironment())) {
     CmdArgs.push_back("-mms-bitfields");
   }
 

diff --git a/clang/test/Driver/ms-bitfields.c b/clang/test/Driver/ms-bitfields.c
index 7bf9aaa..51faa05 100644 (file)
--- a/clang/test/Driver/ms-bitfields.c
+++ b/clang/test/Driver/ms-bitfields.c
@@ -1,4 +1,5 @@
-// RUN: %clang -### %s 2>&1 | FileCheck %s -check-prefix=NO-MSBITFIELDS
+// RUN: %clang -### -target x86_64-linux-gnu %s 2>&1 | FileCheck %s -check-prefix=NO-MSBITFIELDS
+// RUN: %clang -### -target x86_64-windows-gnu %s 2>&1 | FileCheck %s -check-prefix=MSBITFIELDS
 // RUN: %clang -### -mno-ms-bitfields -mms-bitfields %s 2>&1 | FileCheck %s -check-prefix=MSBITFIELDS
 // RUN: %clang -### -mms-bitfields -mno-ms-bitfields %s 2>&1 | FileCheck %s -check-prefix=NO-MSBITFIELDS