dwarf.exp: All numeric attributes require a form

diff --git a/gdb/testsuite/lib/dwarf.exp b/gdb/testsuite/lib/dwarf.exp
index f44ecd7..8ea7a0f 100644
--- a/gdb/testsuite/lib/dwarf.exp
+++ b/gdb/testsuite/lib/dwarf.exp
@@ -225,7 +225,9 @@  proc function_range { func src } {
 #   reference.  The rest of VALUE is taken to be the name of a label,
 #   and DW_FORM_ref4 is used.  See 'new_label' and 'define_label'.
 # * Otherwise, VALUE is taken to be a string and DW_FORM_string is
-#   used.
+#   used.  In order to prevent bugs where a numeric value is given but
+#   no form is specified, it is an error if the value looks like a number
+#   (using Tcl's "string is integer") and no form is provided.
 # More form-guessing functionality may be added.
 #
 # CHILDREN is just Tcl code that can be used to define child DIEs.  It
@@ -614,6 +616,10 @@  namespace eval Dwarf {
 		if {[llength $attr] > 2} {
 		    set attr_form [lindex $attr 2]
 		} else {
+		    # If the value looks like an integer, a form is required.
+		    if [string is integer $attr_value] {
+			error "Integer value requires a form"
+		    }
 		    set attr_form [_guess_form $attr_value attr_value]
 		}
 		set attr_form [_map_name $attr_form _FORM]
diff --git a/gdb/testsuite/gdb.dwarf2/arr-subrange.exp b/gdb/testsuite/gdb.dwarf2/arr-subrange.exp
index 6aacb27..417ee44 100644
--- a/gdb/testsuite/gdb.dwarf2/arr-subrange.exp
+++ b/gdb/testsuite/gdb.dwarf2/arr-subrange.exp
@@ -29,8 +29,8 @@  Dwarf::assemble $asm_file {
                 {DW_AT_language @DW_LANG_Ada95}
                 {DW_AT_name     foo.adb}
                 {DW_AT_comp_dir /tmp}
-                {DW_AT_low_pc   0x1000}
-                {DW_AT_high_pc  0x2000}
+                {DW_AT_low_pc   0x1000 addr}
+                {DW_AT_high_pc  0x2000 addr}
             } {
 	    declare_labels boolean_label typedef_label array_label enum_label
 
diff --git a/gdb/testsuite/gdb.dwarf2/corrupt.exp b/gdb/testsuite/gdb.dwarf2/corrupt.exp
index a8558be..4e86f4a 100644
--- a/gdb/testsuite/gdb.dwarf2/corrupt.exp
+++ b/gdb/testsuite/gdb.dwarf2/corrupt.exp
@@ -38,25 +38,25 @@  Dwarf::assemble $asm_file {
 	    declare_labels int_label
 
 	    int_label: base_type {
-		{byte_size 4}
+		{byte_size 4 sdata}
 		{name "int"}
 	    }
 
 	    enumeration_type {
 		{name "ENUM"}
-		{byte_size 4}
+		{byte_size 4 sdata}
 	    } {
 		enumerator {
 		    {name "A"}
-		    {const_value 0}
+		    {const_value 0 sdata}
 		}
 		enumerator {
 		    {name "B"}
-		    {const_value 1}
+		    {const_value 1 sdata}
 		    {sibling 12345678 DW_FORM_ref4}
 		} {
 		    base_type {
-			{byte_size 1}
+			{byte_size 1 sdata}
 			{name "char"}
 		    }
 		}
diff --git a/gdb/testsuite/gdb.dwarf2/enum-type.exp b/gdb/testsuite/gdb.dwarf2/enum-type.exp
index 48a9f0f..351e51f 100644
--- a/gdb/testsuite/gdb.dwarf2/enum-type.exp
+++ b/gdb/testsuite/gdb.dwarf2/enum-type.exp
@@ -50,7 +50,7 @@  Dwarf::assemble $asm_file {
 	    } {
 		DW_TAG_enumerator {
 		    {DW_AT_name ONE}
-		    {DW_AT_const_value 1}
+		    {DW_AT_const_value 1 DW_FORM_sdata}
 		}
 	    }
 
diff --git a/gdb/testsuite/gdb.trace/entry-values.exp b/gdb/testsuite/gdb.trace/entry-values.exp
index e812241..fa6e31b 100644
--- a/gdb/testsuite/gdb.trace/entry-values.exp
+++ b/gdb/testsuite/gdb.trace/entry-values.exp
@@ -88,7 +88,7 @@  Dwarf::assemble $asm_file {
 	    }
 
 	    foo_label: subprogram {
-		{decl_file 1}
+		{decl_file 1 sdata}
 		{MACRO_AT_func { foo ${srcdir}/${subdir}/${srcfile} }}
 	    } {
 		formal_parameter {
@@ -105,10 +105,10 @@  Dwarf::assemble $asm_file {
 
 	    subprogram {
 		{name bar}
-		{decl_file 1}
+		{decl_file 1 sdata}
 		{low_pc $bar_start addr}
 		{high_pc "$bar_start + $bar_length" addr}
-		{GNU_all_call_sites 1}
+		{GNU_all_call_sites 1 sdata}
 	    } {
 		formal_parameter {
 		    {type :$int_label}
diff --git a/gdb/testsuite/gdb.trace/unavailable-dwarf-piece.exp b/gdb/testsuite/gdb.trace/unavailable-dwarf-piece.exp
index 75b8bf5..17d3a14 100644
--- a/gdb/testsuite/gdb.trace/unavailable-dwarf-piece.exp
+++ b/gdb/testsuite/gdb.trace/unavailable-dwarf-piece.exp
@@ -44,8 +44,8 @@  Dwarf::assemble $asm_file {
 	    struct_s_label: DW_TAG_structure_type {
 		{name s}
 		{byte_size 3 DW_FORM_sdata}
-		{decl_file 1}
-		{decl_line 1}
+		{decl_file 1 DW_FORM_sdata}
+		{decl_line 1 DW_FORM_sdata}
 	    } {
 		DW_TAG_member {
 		    {name a}
@@ -73,8 +73,8 @@  Dwarf::assemble $asm_file {
 	    struct_t_label: DW_TAG_structure_type {
 		{name t}
 		{byte_size 3 DW_FORM_sdata}
-		{decl_file 1}
-		{decl_line 1}
+		{decl_file 1 DW_FORM_sdata}
+		{decl_line 1 DW_FORM_sdata}
 	    } {
 		DW_TAG_member {
 		    {name a}
@@ -174,7 +174,7 @@  Dwarf::assemble $asm_file {
 
 	    DW_TAG_subprogram {
 		{name foo}
-		{decl_file 1}
+		{decl_file 1 sdata}
 		{low_pc foo addr}
 		{high_pc foo_end_lbl addr}
 	    } {
@@ -219,7 +219,7 @@  Dwarf::assemble $asm_file {
 
 	    DW_TAG_subprogram {
 		{name bar}
-		{decl_file 1}
+		{decl_file 1 sdata}
 		{low_pc bar addr}
 		{high_pc bar_end_lbl addr}
 	    } {