* config/i386/cygming.h [HAVE_GAS_PE_SECREL32_RELOC]

	(DWARF2_DEBUGGING_INFO): Define to enable.
	(DBX_REGISTER_NUMBER): Define to use the svr4 register map for
	DWARF2.
	* configure.ac (Target-specific assembler checks)
	<i[34567]86-*-[cygwin*|pe|mingw32*]>: New test for .secrel32
	relocs.
	* configure: Regenerate.
	* config.in: Likewise.

	* config/i386/cygming.h [HAVE_GAS_PE_SECREL32_RELOC]
	(ASM_OUPUT_DWARF_OFFSET): Define.

From-SVN: r81359

gcc/config.in

@@ -262,6 +262,10 @@
    skip when using the GAS .p2align command. */
 #undef HAVE_GAS_MAX_SKIP_P2ALIGN
 
+/* Define if your assembler and linker support 32-bit section relative relocs
+   via '.secrel32 label'. */
+#undef HAVE_GAS_PE_SECREL32_RELOC
+
 /* Define 0/1 if your assembler supports marking sections with SHF_MERGE flag.
    */
 #undef HAVE_GAS_SHF_MERGE

gcc/config/i386/cygming.h

@@ -25,6 +25,27 @@ Boston, MA 02111-1307, USA.  */
 #undef PREFERRED_DEBUGGING_TYPE
 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
 
+#ifdef HAVE_GAS_PE_SECREL32_RELOC
+#define DWARF2_DEBUGGING_INFO 1
+
+#undef DBX_REGISTER_NUMBER
+#define DBX_REGISTER_NUMBER(n) (write_symbols == DWARF2_DEBUG   \
+                                ? svr4_dbx_register_map[n]      \
+                                : dbx_register_map[n])
+
+/* Use section relative relocations for debugging offsets.  Unlike
+   other targets that fake this by putting the section VMA at 0, PE
+   won't allow it.  */
+#define ASM_OUTPUT_DWARF_OFFSET(FILE, SIZE, LABEL)    \
+  do {                                                \
+    if (SIZE != 4)                                    \
+      abort ();                                       \
+                                                      \
+    fputs ("\t.secrel32\t", FILE);                    \
+    assemble_name (FILE, LABEL);                      \
+  } while (0)
+#endif
+
 #define TARGET_EXECUTABLE_SUFFIX ".exe"
 
 #include <stdio.h>

gcc/configure.ac

@@ -2539,6 +2539,26 @@ foo:
 changequote(,)dnl
   i[34567]86-*-* | x86_64-*-*)
 changequote([,])dnl
+    case $target_os in
+      cygwin* | pe | mingw32*)
+	# Used for DWARF 2 in PE
+	gcc_GAS_CHECK_FEATURE([.secrel32 relocs],
+	  gcc_cv_as_ix86_pe_secrel32,
+	  [2,15,91],,
+[.text
+foo:	nop
+.data
+	.secrel32 foo],
+	  [if test x$gcc_cv_ld != x \
+	   && $gcc_cv_ld -o conftest conftest.o > /dev/null 2>&1; then
+	     gcc_cv_as_ix86_pe_secrel32=yes
+	   fi
+	   rm -f conftest],
+	  [AC_DEFINE(HAVE_GAS_PE_SECREL32_RELOC, 1,
+	    [Define if your assembler and linker support 32-bit section relative relocs via '.secrel32 label'.])])
+	;;
+    esac
+
     gcc_GAS_CHECK_FEATURE([filds and fists mnemonics],
        gcc_cv_as_ix86_filds_fists,
       [2,9,0],, [filds mem; fists mem],,