gdb/

	Fix gdb.fortran/common-block.exp crash in PIE mode.
	* dwarf2read.c (new_symbol_full) <DW_TAG_common_block>: Use
	LOC_COMMON_BLOCK.
	* f-valprint.c (info_common_command_for_block): Expect
	LOC_COMMON_BLOCK in gdb_assert.
	* symtab.h (struct general_symbol_info): Update comment for the
	common_block member.
	(domain_enum): Extend comment for the COMMON_BLOCK_DOMAIN member.
	(enum address_class): New member LOC_COMMON_BLOCK.

1 files changed, 7 insertions, 2 deletions

diff --git a/gdb/symtab.h b/gdb/symtab.h
index c334a3a28df..b992266f265 100644
--- a/gdb/symtab.h
+++ b/gdb/symtab.h
@@ -120,7 +120,7 @@ struct general_symbol_info
 
     CORE_ADDR address;
 
-    /* A common block.  Used with COMMON_BLOCK_DOMAIN.  */
+    /* A common block.  Used with LOC_COMMON_BLOCK.  */
 
     struct common_block *common_block;
 
@@ -414,7 +414,8 @@ typedef enum domain_enum_tag
 
   LABEL_DOMAIN,
 
-  /* Fortran common blocks.  Their naming must be separate from VAR_DOMAIN.  */
+  /* Fortran common blocks.  Their naming must be separate from VAR_DOMAIN.
+     They also always use LOC_COMMON_BLOCK.  */
   COMMON_BLOCK_DOMAIN
 } domain_enum;
 
@@ -533,6 +534,10 @@ enum address_class
   /* The variable's address is computed by a set of location
      functions (see "struct symbol_computed_ops" below).  */
   LOC_COMPUTED,
+
+  /* The variable uses general_symbol_info->value->common_block field.
+     It also always uses COMMON_BLOCK_DOMAIN.  */
+  LOC_COMMON_BLOCK,
 };
 
 /* The methods needed to implement LOC_COMPUTED.  These methods can