Factored out tool invocation code into separate file.

driver/tool.cpp

@@ -0,0 +1,47 @@
+//===-- tool.cpp ----------------------------------------------------------===//
+//
+//                         LDC – the LLVM D compiler
+//
+// This file is distributed under the BSD-style LDC license. See the LICENSE
+// file for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "driver/tool.h"
+#include "mars.h"
+#include "llvm/Support/Program.h"
+
+int executeToolAndWait(llvm::sys::Path tool, std::vector<std::string> const & args, bool verbose)
+{
+    // Construct real argument list.
+    // First entry is the tool itself, last entry must be NULL.
+    std::vector<const char *> realargs;
+    realargs.reserve(args.size() + 2);
+    realargs.push_back(tool.c_str());
+    for (std::vector<std::string>::const_iterator it = args.begin(); it != args.end(); ++it)
+    {
+        realargs.push_back((*it).c_str());
+    }
+    realargs.push_back(NULL);
+
+    // Print command line if requested
+    if (verbose)
+    {
+        // Print it
+        for (size_t i = 0; i < realargs.size()-1; i++)
+            printf("%s ", realargs[i]);
+        printf("\n");
+        fflush(stdout);
+    }
+
+    // Execute tool.
+    std::string errstr;
+    if (int status = llvm::sys::Program::ExecuteAndWait(tool, &realargs[0], NULL, NULL, 0, 0, &errstr))
+    {
+        error("%s failed with status: %d", tool.c_str(), status);
+        if (!errstr.empty())
+            error("message: %s", errstr.c_str());
+        return status;
+    }
+    return 0;
+}