libdw: Initialize variables in getcfi_gnu_eh_frame.

Some older GCCs are not clever enough to realize that when search_table
is NULL not only are search_table_entries and search_table_encoding not
initialized, they are also not used. Giving "may be used uninitialized"
errors.

Signed-off-by: Mark Wielaard <mjw@redhat.com>

diff --git a/libdw/ChangeLog b/libdw/ChangeLog
index 37f94df..c199707 100644 (file)
--- a/libdw/ChangeLog
+++ b/libdw/ChangeLog
@@ -1,3 +1,8 @@
+2014-11-27  Mark Wielaard  <mjw@redhat.com>
+
+       * dwarf_getcfi_elf.c (getcfi_gnu_eh_frame): Initialize
+       search_table_entries and search_table_encoding.
+
 2014-11-24  Mark Wielaard  <mjw@redhat.com>
 
        * dwarf_getsrclines.c (read_srclines): Check line_range is not zero

diff --git a/libdw/dwarf_getcfi_elf.c b/libdw/dwarf_getcfi_elf.c
index a423ef3..61ca60d 100644 (file)
--- a/libdw/dwarf_getcfi_elf.c
+++ b/libdw/dwarf_getcfi_elf.c
@@ -1,5 +1,5 @@
 /* Get CFI from ELF file's exception-handling info.
-   Copyright (C) 2009-2010 Red Hat, Inc.
+   Copyright (C) 2009-2010, 2014 Red Hat, Inc.
    This file is part of elfutils.
 
    This file is free software; you can redistribute it and/or modify
@@ -140,8 +140,8 @@ getcfi_gnu_eh_frame (Elf *elf, const GElf_Ehdr *ehdr, const GElf_Phdr *phdr)
     }
 
   Dwarf_Addr eh_frame_ptr;
-  size_t search_table_entries;
-  uint8_t search_table_encoding;
+  size_t search_table_entries = 0;
+  uint8_t search_table_encoding = 0;
   const uint8_t *search_table = parse_eh_frame_hdr (data->d_buf, phdr->p_filesz,
                                                    phdr->p_vaddr, ehdr,
                                                    &eh_frame_ptr,