[COMMITTED] readelf: Only lookup files and show errors in attr_callback when not silent.

[Mark Wielaard <mark@klomp.org>]

We recently added a couple more sanity checks and show an error when
attributes that represent files cannot be resolved. We should only do
this when the attr_callback should print the attribute information.
When not (for example when not showing the .debug_info section, but
only collecting information about the CUs containing pointers into
other sections) we don't need to lookup the file names, nor print
the errors/warnings.

Signed-off-by: Mark Wielaard <mark@klomp.org>
---
 src/ChangeLog | 4 ++++
 src/readelf.c | 3 +++
 2 files changed, 7 insertions(+)

diff --git a/src/ChangeLog b/src/ChangeLog
index 55eb279..068c87b 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,7 @@
+2018-04-14  Mark Wielaard  <mark@klomp.org>
+
+	* readelf.c (attr_callback): Only show errors when not silent.
+
 2018-03-23  Mark Wielaard  <mark@klomp.org>
 
 	* readelf.c (attr_callback): Handle DW_FORM_strx[1234].
diff --git a/src/readelf.c b/src/readelf.c
index 3fb5ee6..8c0ef6c 100644
--- a/src/readelf.c
+++ b/src/readelf.c
@@ -6253,6 +6253,9 @@ attr_callback (Dwarf_Attribute *attrp, void *arg)
 	case DW_AT_decl_file:
 	case DW_AT_call_file:
 	  {
+	    if (cbargs->silent)
+	      break;
+
 	    /* Try to get the actual file, the current interface only
 	       gives us full paths, but we only want to show the file
 	       name for now.  */
-- 
1.8.3.1