Print the path to the configuration file being used if -v is passed.

gen/configfile.cpp

@@ -89,6 +89,9 @@ bool ConfigFile::read(const char* argv0, void* mainAddr, const char* filename)
         }
     }
 
+    // save config file path for -v output
+    pathstr = p.toString();
+
     try
     {
         // read the cfg

gen/configfile.h

@@ -2,6 +2,7 @@
 #define LDC_CONF_CONFIGFILE_H
 
 #include <vector>
+#include <string>
 
 namespace libconfig
 {
@@ -23,8 +24,11 @@ public:
     s_iterator switches_begin()   { return switches.begin(); }
     s_iterator switches_end()     { return switches.end(); }
 
+    const std::string& path()     { return pathstr; }
+
 private:
     libconfig::Config* cfg;
+    std::string pathstr;
 
     s_vector switches;
 };

gen/main.cpp

@@ -204,6 +204,13 @@ int main(int argc, char** argv)
     cl::SetVersionPrinter(&printVersion);
     cl::ParseCommandLineOptions(final_args.size(), (char**)&final_args[0], "LLVM-based D Compiler\n", true);
 
+    // Print config file path if -v was passed
+    if (global.params.verbose) {
+        const std::string& path = cfg_file.path();
+        if (!path.empty())
+            printf("config    %s\n", path.c_str());
+    }
+
     // Negated options
     global.params.link = !compileOnly;
     global.params.obj = !dontWriteObj;