On 10/6/2017 4:09 PM, Saleem Abdulrasool via cfe-commits wrote:
Modified: cfe/trunk/lib/Driver/ToolChains/Clang.cpp
URL:
http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Driver/ToolChains/Clang.cpp?rev=315126&r1=315125&r2=315126&view=diff
==============================================================================
--- cfe/trunk/lib/Driver/ToolChains/Clang.cpp (original)
+++ cfe/trunk/lib/Driver/ToolChains/Clang.cpp Fri Oct 6 16:09:55 2017
@@ -2601,6 +2601,33 @@ static void RenderModulesOptions(Compila
Args.AddLastArg(CmdArgs,
options::OPT_fmodules_disable_diagnostic_validation);
}
+static void RenderCharacterOptions(const ArgList &Args, const llvm::Triple &T,
+ ArgStringList &CmdArgs) {
+ // -fsigned-char is default.
+ if (const Arg *A = Args.getLastArg(options::OPT_fsigned_char,
+ options::OPT_fno_signed_char,
+ options::OPT_funsigned_char,
+ options::OPT_fno_unsigned_char)) {
+ if (A->getOption().matches(options::OPT_funsigned_char) ||
+ A->getOption().matches(options::OPT_fno_signed_char)) {
+ CmdArgs.push_back("-fno-signed-char");
+ }
+ } else if (!isSignedCharDefault(T)) {
+ CmdArgs.push_back("-fno-signed-char");
+ }
+
+ if (const Arg *A = Args.getLastArg(options::OPT_fshort_wchar,
+ options::OPT_fno_short_wchar)) {
+ if (A->getOption().matches(options::OPT_fshort_wchar)) {
+ CmdArgs.push_back("-fwchar-type=short");
+ CmdArgs.push_back("-fno-signed-wchar");
+ } else {
+ CmdArgs.push_back("-fwchar-type=int");
+ CmdArgs.push_back("-fsigned-wchar");
+ }
+ }
+}
It looks like this changes the behavior of "-fno-short-wchar".
Specifically, on targets where the default wchar_t type is "unsigned
int" (like ARM AAPCS), "-fno-short-wchar" used to be a no-op, but now it
changes the sign of wchar_t. Why are we overriding the default here?
-Eli
--
Employee of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux
Foundation Collaborative Project
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