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Add support for driver option -mno-ms-bitfields. 

This option is used to cancel -mms-bitfields on the command line.

rdar://problem/15898553

llvm-svn: 252912
This commit is contained in:
Akira Hatanaka 2015-11-12 17:21:22 +00:00
parent 2aebdda81e
commit 0202848ad0
3 changed files with 10 additions and 1 deletions
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2
clang/include/clang/Driver/Options.td
View File

@ -1273,6 +1273,8 @@ def mmacosx_version_min_EQ : Joined<["-"], "mmacosx-version-min=">,
Group<m_Group>, HelpText<"Set Mac OS X deployment target">;
def mms_bitfields : Flag<["-"], "mms-bitfields">, Group<m_Group>, Flags<[CC1Option]>,
HelpText<"Set the default structure layout to be compatible with the Microsoft compiler standard">;
def mno_ms_bitfields : Flag<["-"], "mno-ms-bitfields">, Group<m_Group>,
HelpText<"Do not set the default structure layout to be compatible with the Microsoft compiler standard">;
def mstackrealign : Flag<["-"], "mstackrealign">, Group<m_Group>, Flags<[CC1Option]>,
HelpText<"Force realign the stack at entry to every function">;
def mstack_alignment : Joined<["-"], "mstack-alignment=">, Group<m_Group>, Flags<[CC1Option]>,

3
clang/lib/Driver/Tools.cpp
View File

@ -3713,7 +3713,8 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
if (KernelOrKext && getToolChain().getTriple().isOSDarwin())
CmdArgs.push_back("-fforbid-guard-variables");
if (Args.hasArg(options::OPT_mms_bitfields)) {
if (Args.hasFlag(options::OPT_mms_bitfields, options::OPT_mno_ms_bitfields,
false)) {
CmdArgs.push_back("-mms-bitfields");
}

6
clang/test/Driver/ms-bitfields.c Normal file
View File

@ -0,0 +1,6 @@
// RUN: %clang -### %s 2>&1 | FileCheck %s -check-prefix=NO-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
// MSBITFIELDS: -mms-bitfields
// NO-MSBITFIELDS-NOT: -mms-bitfields