[clang-cl] Add /Zc:wchar_t- option

Map /Zc:wchar_t- to the cc1 flag -fno-wchar which is already supported. Reviewed By: thakis Differential Revision: https://reviews.llvm.org/D125513
llvm · May 17, 2022 · 366e57d · 366e57d
1 parent f84741d
commit 366e57d
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Showing 4 changed files with 10 additions and 3 deletions.
diff --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td
@@ -6487,6 +6487,10 @@ def _SLASH_Zc_twoPhase : CLFlag<"Zc:twoPhase">,
 def _SLASH_Zc_twoPhase_ : CLFlag<"Zc:twoPhase-">,
   HelpText<"Disable two-phase name lookup in templates (default)">,
   Alias<fdelayed_template_parsing>;
+def _SLASH_Zc_wchar_t : CLFlag<"Zc:wchar_t">,
+  HelpText<"Enable C++ builtin type wchar_t (default)">;
+def _SLASH_Zc_wchar_t_ : CLFlag<"Zc:wchar_t-">,
+  HelpText<"Disable C++ builtin type wchar_t">;
 def _SLASH_Z7 : CLFlag<"Z7">,
   HelpText<"Enable CodeView debug information in object files">;
 def _SLASH_Zi : CLFlag<"Zi">, Alias<_SLASH_Z7>,
@@ -6674,7 +6678,6 @@ def _SLASH_Zc_forScope : CLIgnoredFlag<"Zc:forScope">;
 def _SLASH_Zc_inline : CLIgnoredFlag<"Zc:inline">;
 def _SLASH_Zc_rvalueCast : CLIgnoredFlag<"Zc:rvalueCast">;
 def _SLASH_Zc_ternary : CLIgnoredFlag<"Zc:ternary">;
-def _SLASH_Zc_wchar_t : CLIgnoredFlag<"Zc:wchar_t">;
 def _SLASH_ZH_MD5 : CLIgnoredFlag<"ZH:MD5">;
 def _SLASH_ZH_SHA1 : CLIgnoredFlag<"ZH:SHA1">;
 def _SLASH_ZH_SHA_256 : CLIgnoredFlag<"ZH:SHA_256">;

diff --git a/clang/lib/Driver/ToolChains/Clang.cpp b/clang/lib/Driver/ToolChains/Clang.cpp
@@ -7589,6 +7589,11 @@ void Clang::AddClangCLArgs(const ArgList &Args, types::ID InputType,
   CmdArgs.push_back("-fno-dllexport-inlines");
  }
 
+ if (Args.hasFlag(options::OPT__SLASH_Zc_wchar_t_,
+                  options::OPT__SLASH_Zc_wchar_t, false)) {
+   CmdArgs.push_back("-fno-wchar");
+ }
+
   Arg *MostGeneralArg = Args.getLastArg(options::OPT__SLASH_vmg);
   Arg *BestCaseArg = Args.getLastArg(options::OPT__SLASH_vmb);
   if (MostGeneralArg && BestCaseArg)

diff --git a/clang/test/Driver/cl-options.c b/clang/test/Driver/cl-options.c
@@ -404,7 +404,6 @@
 // RUN:    /Zc:inline \
 // RUN:    /Zc:rvalueCast \
 // RUN:    /Zc:ternary \
-// RUN:    /Zc:wchar_t \
 // RUN:    /ZH:MD5 \
 // RUN:    /ZH:SHA1 \
 // RUN:    /ZH:SHA_256 \

diff --git a/clang/test/Driver/cl-zc.cpp b/clang/test/Driver/cl-zc.cpp
@@ -47,7 +47,7 @@
 // RUN: %clang_cl /c -### /Zc:wchar_t -- %s 2>&1 | FileCheck -check-prefix=WCHAR_T-ON %s
 // WCHAR_T-ON-NOT: argument unused during compilation
 // RUN: %clang_cl /c -### /Zc:wchar_t- -- %s 2>&1 | FileCheck -check-prefix=WCHAR_T-OFF %s
-// WCHAR_T-OFF: argument unused during compilation
+// WCHAR_T-OFF: "-fno-wchar"
 
 // RUN: %clang_cl /c -### /Zc:auto -- %s 2>&1 | FileCheck -check-prefix=AUTO-ON %s
 // AUTO-ON-NOT: argument unused during compilation