re PR c++/42870 (__attribute__ ((dllexport)) produces broken linkage)

	PR c++/42870
	* config/i386/cygming.h (ASM_OUTPUT_DEF_FROM_DECLS): Call
	i386_pe_maybe_record_exported_symbol.

From-SVN: r156529

gcc/ChangeLog

+2010-02-03  Jason Merrill  <jason@redhat.com>
+
+	PR c++/42870
+	* config/i386/cygming.h (ASM_OUTPUT_DEF_FROM_DECLS): Call
+	i386_pe_maybe_record_exported_symbol.
+
 2010-02-05  Steve Ellcey  <sje@cup.hp.com>
 
 	PR target/42924

gcc/config/i386/cygming.h

@@ -361,6 +361,7 @@ do {						\
     {									\
       const char *alias							\
 	= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (DECL));		\
+      i386_pe_maybe_record_exported_symbol (DECL, alias, 0);		\
       if (TREE_CODE (DECL) == FUNCTION_DECL)				\
 	i386_pe_declare_function_type (STREAM, alias,			\
 				       TREE_PUBLIC (DECL));		\

gcc/testsuite/ChangeLog

+2010-02-03  Jason Merrill  <jason@redhat.com>
+
+	PR c++/42870
+	* g++.dg/ext/dllexport3.C: New.
+
 2010-02-05  Ozkan Sezer  <sezeroz@gmail.com>
 
 	* gcc.dg/format/ms-format3.c: New test for specific MS types.

gcc/testsuite/g++.dg/ext/dllexport3.C

+// PR c++/42870
+// { dg-do compile { target i?86-*-cygwin *-*-mingw* } }
+// { dg-final { scan-assembler "-export:_ZN2SaD1Ev" } }
+
+#define ATTRIBUTE __attribute__ ((dllexport))
+class ATTRIBUTE Sa {
+ public:
+  Sa()
+    {}
+  ~Sa();
+};
+ATTRIBUTE Sa::~Sa()
+{return;}
+
+bool DllMain(void *a,void*b,int)
+{
+  Sa s;
+  return true;
+}