commit 7d04eca24fb83cf38176490460ee77a7fc40d458
Author: Pavel Chupin <pavel.v.chupin@intel.com>
Date:   Fri Jan 11 14:00:44 2013 +0400

    Fix mingw gold build with plugins enabled
    
    Signed-off-by: Pavel Chupin <pavel.v.chupin@intel.com>

diff --git a/gold/Makefile.am b/gold/Makefile.am
index df8dcb5..0c13c10 100644
--- a/gold/Makefile.am
+++ b/gold/Makefile.am
@@ -37,7 +37,7 @@ AM_CPPFLAGS = \
 LIBIBERTY = ../libiberty/libiberty.a
 
 if PLUGINS
-LIBDL = -ldl
+LIBDL = @lt_cv_dlopen_libs@
 endif
 
 if THREADS
diff --git a/gold/configure.ac b/gold/configure.ac
index 804a474..9ab7973 100644
--- a/gold/configure.ac
+++ b/gold/configure.ac
@@ -505,6 +505,13 @@ AC_LANG_PUSH(C++)
 AC_CHECK_HEADERS(tr1/unordered_set tr1/unordered_map)
 AC_CHECK_HEADERS(ext/hash_map ext/hash_set)
 AC_CHECK_HEADERS(byteswap.h)
+
+dnl When plugins enabled dynamic loader interface is required. Check headers
+dnl which may provide this interface. In case of dlfcn.h add libdl to link.
+AC_CHECK_HEADERS(windows.h)
+AC_CHECK_HEADERS(dlfcn.h,lt_cv_dlopen_libs="-ldl",lt_cv_dlopen_libs="")
+AC_SUBST(lt_cv_dlopen_libs)
+
 AC_CHECK_FUNCS(mallinfo posix_fallocate fallocate readv sysconf times)
 AC_CHECK_DECLS([basename, ffs, asprintf, vasprintf, snprintf, vsnprintf, strverscmp, strndup, memmem])
 
diff --git a/gold/plugin.cc b/gold/plugin.cc
index c39e11e..ca497f7 100644
--- a/gold/plugin.cc
+++ b/gold/plugin.cc
@@ -29,9 +29,39 @@
 #include <vector>
 
 #ifdef ENABLE_PLUGINS
+#ifdef HAVE_DLFCN_H
 #include <dlfcn.h>
+#elif defined (HAVE_WINDOWS_H)
+#include <windows.h>
+#else
+#error Unknown how to handle dynamic-load-libraries.
 #endif
 
+#if !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H)
+
+#define RTLD_NOW 0      /* Dummy value.  */
+static void *
+dlopen(const char *file, int mode ATTRIBUTE_UNUSED)
+{
+  return LoadLibrary(file);
+}
+
+static void *
+dlsym(void *handle, const char *name)
+{
+  return reinterpret_cast<void *>(
+     GetProcAddress(static_cast<HMODULE>(handle),name));
+}
+
+static const char *
+dlerror(void)
+{
+  return "unable to load dll";
+}
+
+#endif /* !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H)  */
+#endif /* ENABLE_PLUGINS */
+
 #include "parameters.h"
 #include "errors.h"
 #include "fileread.h"