Make it possible to set the flags passed to the assembler.

Nick, please review.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@110705 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm-c/lto.h

@@ -220,6 +220,12 @@ lto_codegen_set_gcc_path(lto_code_gen_t cg, const char* path);
 extern void
 lto_codegen_set_assembler_path(lto_code_gen_t cg, const char* path);
 
+/**
+ * Sets extra arguments that libLTO should pass to the assembler.
+ */
+extern void
+lto_codegen_set_assembler_args(lto_code_gen_t cg, const char **args,
+                               int nargs);
 
 /**
  * Adds to a list of all global symbols that must exist in the final

tools/gold/gold-plugin.cpp

@@ -66,6 +66,7 @@ namespace options {
   static generate_bc generate_bc_file = BC_NO;
   static std::string bc_path;
   static std::string as_path;
+  static std::vector<std::string> as_args;
   static std::vector<std::string> pass_through;
   static std::string extra_library_path;
   static std::string triple;
@@ -91,6 +92,9 @@ namespace options {
       } else {
         as_path = opt.substr(strlen("as="));
       }
+    } else if (opt.startswith("as-arg=")) {
+      llvm::StringRef item = opt.substr(strlen("as-arg="));
+      as_args.push_back(item.str());
     } else if (opt.startswith("extra-library-path=")) {
       extra_library_path = opt.substr(strlen("extra_library_path="));
     } else if (opt.startswith("pass-through=")) {
@@ -401,6 +405,14 @@ static ld_plugin_status all_symbols_read_hook(void) {
     sys::Path p = sys::Program::FindProgramByName(options::as_path);
     lto_codegen_set_assembler_path(cg, p.c_str());
   }
+  if (!options::as_args.empty()) {
+    std::vector<const char *> as_args_p;
+    for (std::vector<std::string>::iterator I = options::as_args.begin(),
+           E = options::as_args.end(); I != E; ++I) {
+      as_args_p.push_back(I->c_str());
+    }
+    lto_codegen_set_assembler_args(cg, &as_args_p[0], as_args_p.size());
+  }
   // Pass through extra options to the code generator.
   if (!options::extra.empty()) {
     for (std::vector<std::string>::iterator it = options::extra.begin();

tools/lto/LTOCodeGenerator.cpp

@@ -126,6 +126,14 @@ void LTOCodeGenerator::setAssemblerPath(const char* path)
     _assemblerPath = new sys::Path(path);
 }
 
+void LTOCodeGenerator::setAssemblerArgs(const char** args, int nargs)
+{
+  for (int i = 0; i < nargs; ++i) {
+    const char *arg = args[i];
+    _assemblerArgs.push_back(arg);
+  }
+}
+
 void LTOCodeGenerator::addMustPreserveSymbol(const char* sym)
 {
     _mustPreserveSymbols[sym] = 1;
@@ -257,6 +265,11 @@ bool LTOCodeGenerator::assemble(const std::string& asmPath,
         args.push_back("-c");
         args.push_back("-x");
         args.push_back("assembler");
+    } else {
+        for (std::vector<std::string>::iterator I = _assemblerArgs.begin(),
+               E = _assemblerArgs.end(); I != E; ++I) {
+            args.push_back(I->c_str());
+        }
     }
     args.push_back("-o");
     args.push_back(objPath.c_str());

tools/lto/LTOCodeGenerator.h

@@ -37,6 +37,7 @@ struct LTOCodeGenerator {
     bool                setDebugInfo(lto_debug_model, std::string& errMsg);
     bool                setCodePICModel(lto_codegen_model, std::string& errMsg);
     void                setAssemblerPath(const char* path);
+    void                setAssemblerArgs(const char** args, int nargs);
     void                addMustPreserveSymbol(const char* sym);
     bool                writeMergedModules(const char* path, 
                                                            std::string& errMsg);
@@ -62,6 +63,7 @@ private:
     llvm::MemoryBuffer*         _nativeObjectFile;
     std::vector<const char*>    _codegenOptions;
     llvm::sys::Path*            _assemblerPath;
+    std::vector<std::string>    _assemblerArgs;
 };
 
 #endif // LTO_CODE_GENERATOR_H

tools/lto/lto.cpp

@@ -218,6 +218,16 @@ void lto_codegen_set_assembler_path(lto_code_gen_t cg, const char* path)
     cg->setAssemblerPath(path);
 }
 
+
+//
+// sets extra arguments that libLTO should pass to the assembler
+//
+void lto_codegen_set_assembler_args(lto_code_gen_t cg, const char** args,
+                                    int nargs)
+{
+  cg->setAssemblerArgs(args, nargs);
+}
+
 //
 // adds to a list of all global symbols that must exist in the final
 // generated code.  If a function is not listed there, it might be