[clang][WebAssembly] Support the -m(no-)red-zone flag.

alexrp · alexrp · commit 28834f7a4251 · 2024-12-15T06:15:24.000+01:00
LLVM's WebAssembly backend supports the noredzone function attribute, but this
support was not exposed in Clang.
diff --git a/clang/lib/Driver/ToolChains/Clang.cpp b/clang/lib/Driver/ToolChains/Clang.cpp
@@ -2404,6 +2404,9 @@ void Clang::AddWebAssemblyTargetArgs(const ArgList &Args,
   if (!Args.hasArg(options::OPT_fvisibility_EQ,
                    options::OPT_fvisibility_ms_compat))
     CmdArgs.push_back("-fvisibility=hidden");
+
+  if (!Args.hasFlag(options::OPT_mred_zone, options::OPT_mno_red_zone, true))
+    CmdArgs.push_back("-disable-red-zone");
 }
 
 void Clang::AddVETargetArgs(const ArgList &Args, ArgStringList &CmdArgs) const {

Original file line number	Diff line number	Diff line change
`@@ -2404,6 +2404,9 @@ void Clang::AddWebAssemblyTargetArgs(const ArgList &Args,`
`2404`	`2404`	`if (!Args.hasArg(options::OPT_fvisibility_EQ,`
`2405`	`2405`	`options::OPT_fvisibility_ms_compat))`
`2406`	`2406`	`CmdArgs.push_back("-fvisibility=hidden");`
	`2407`	`+`
	`2408`	`+ if (!Args.hasFlag(options::OPT_mred_zone, options::OPT_mno_red_zone, true))`
	`2409`	`+ CmdArgs.push_back("-disable-red-zone");`
`2407`	`2410`	`}`
`2408`	`2411`
`2409`	`2412`	`void Clang::AddVETargetArgs(const ArgList &Args, ArgStringList &CmdArgs) const {`