[binutils-gdb] Silence maybe-uninitialized warning in dwarf2read.c

[gdb-buildbot@sergiodj.net]

*** TEST RESULTS FOR COMMIT feee869bd84841bc048b4ca60a8713d80f8be5d9 ***

commit feee869bd84841bc048b4ca60a8713d80f8be5d9
Author:     Tom Tromey <tromey@adacore.com>
AuthorDate: Wed Dec 4 07:46:59 2019 -0700
Commit:     Tom Tromey <tromey@adacore.com>
CommitDate: Wed Dec 4 07:48:44 2019 -0700

    Silence maybe-uninitialized warning in dwarf2read.c
    
    I upgraded to Fedora 30 recently.  It includes GCC 9, which gives a
    warning for dwarf2read.c:
    
    ../../binutils-gdb/gdb/dwarf2read.c:16103:24: warning: discr_offset may be used uninitialized in this function [-Wmaybe-uninitialized]
    
    This patch fixes the problem by initializing discr_offset.
    Tested by rebuilding.
    
    gdb/ChangeLog
    2019-12-04  Tom Tromey  <tromey@adacore.com>
    
            * dwarf2read.c (process_structure_scope): Initialize
            "discr_offset".
    
    Change-Id: I76a6157921c9beacb641b8a41e10026006621b95

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index aacc0c9b16..f27043da0e 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,8 @@
+2019-12-04  Tom Tromey  <tromey@adacore.com>
+
+	* dwarf2read.c (process_structure_scope): Initialize
+	"discr_offset".
+
 2019-12-04  Andrew Burgess  <andrew.burgess@embecosm.com>
 
 	* mi/mi-symbol-cmds.c (mi_symbol_info): Take extra parameter, and
diff --git a/gdb/dwarf2read.c b/gdb/dwarf2read.c
index 327837cc3c..f99061d40d 100644
--- a/gdb/dwarf2read.c
+++ b/gdb/dwarf2read.c
@@ -16060,7 +16060,7 @@ process_structure_scope (struct die_info *die, struct dwarf2_cu *cu)
      read the discriminant member, so we can record it later in the
      discriminant_info.  */
   bool is_variant_part = TYPE_FLAG_DISCRIMINATED_UNION (type);
-  sect_offset discr_offset;
+  sect_offset discr_offset {};
   bool has_template_parameters = false;
 
   if (is_variant_part)