Preparation to support Apple ld64's -w option

common/common.h

@@ -159,7 +159,7 @@ private:
 template <typename Context>
 class Error {
 public:
-  Error(Context &ctx) : out(ctx, std::cerr) {
+  Error(Context &ctx) : out(ctx, std::cerr), suppress(ctx.arg.suppress_warnings) {
     if (ctx.arg.noinhibit_exec) {
       out << add_color(ctx, "warning");
     } else {
@@ -169,12 +169,14 @@ public:
   }
 
   template <class T> Error &operator<<(T &&val) {
-    out << std::forward<T>(val);
+    if (!suppress)
+      out << std::forward<T>(val);
     return *this;
   }
 
 private:
   SyncOut<Context> out;
+  bool suppress;
 };
 
 template <typename Context>

elf/mold.h

@@ -1623,11 +1623,11 @@ struct Context {
     bool Bsymbolic = false;
     bool Bsymbolic_functions = false;
     bool allow_multiple_definition = false;
+    bool apply_dynamic_relocs = true;
     bool color_diagnostics = false;
     bool default_symver = false;
     bool demangle = true;
     bool discard_all = false;
-    bool apply_dynamic_relocs = true;
     bool discard_locals = false;
     bool eh_frame_hdr = true;
     bool emit_relocs = false;
@@ -1667,6 +1667,7 @@ struct Context {
     bool stats = false;
     bool strip_all = false;
     bool strip_debug = false;
+    bool suppress_warnings = false;
     bool trace = false;
     bool undefined_version = false;
     bool warn_common = false;