[committed] If .debug_info section not present, exit with 0

[Tom de Vries <tdevries@suse.de>]

Hi,

There are two errors switched off by --quiet (provided we don't run with -o):
- DWARF compression not beneficial
- .debug_info section not present
If we run into the first error, we exit with '0', but if we run into the
second error, we exit with '1'.

It seems that if the error is unimportant enough to not print with --quiet,
it's not worth exiting with '1' either.  Fix this.

Committed to trunk.

Thanks,
- Tom

If .debug_info section not present, exit with 0

2019-07-11  Tom de Vries  <tdevries@suse.de>

	PR dwz/24766
	* dwz.c (read_dwarf): Return 3 if .debug_info not present.
	(dwz): If read_dwarf returned 3, exit with 0.
	* testsuite/dwz.tests/objcopy-strip-debug.sh: Update.

---
 dwz.c                                      |  7 ++++++-
 testsuite/dwz.tests/objcopy-strip-debug.sh | 14 +++++++++++++-
 2 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/dwz.c b/dwz.c
index cd382b9..e5de164 100644
--- a/dwz.c
+++ b/dwz.c
@@ -10276,7 +10276,7 @@ read_dwarf (DSO *dso, bool quieter)
       if (!quieter)
 	error (0, 0, "%s: .debug_info section not present",
 	       dso->filename);
-      return 1;
+      return 3;
     }
 
   if (debug_sections[GNU_DEBUGALTLINK].data != NULL)
@@ -11815,6 +11815,11 @@ dwz (const char *file, const char *outfile, struct file_result *res,
   free (dso);
   if (ret == 0 && !low_mem)
     res->res = 0;
+  if (ret == 3)
+    {
+      ret = (outfile != NULL) ? 1 : 0;
+      res->res = -1;
+    }
   return ret;
 }
 
diff --git a/testsuite/dwz.tests/objcopy-strip-debug.sh b/testsuite/dwz.tests/objcopy-strip-debug.sh
index 043563b..a22ba3a 100644
--- a/testsuite/dwz.tests/objcopy-strip-debug.sh
+++ b/testsuite/dwz.tests/objcopy-strip-debug.sh
@@ -11,8 +11,20 @@ if ! grep -q "\.debug_info section not present" dwz.err; then
     exit 1
 fi
 
-[ $status -eq 1 ]
+[ $status -eq 0 ]
 
 cmp 1 1.saved
 
+if dwz 1 -o 2 2>dwz.err; status=$?; then
+    true
+fi
+
+if ! grep -q "\.debug_info section not present" dwz.err; then
+    cat dwz.err
+    exit 1
+fi
+
+[ $status -eq 1 ]
+[ ! -f 2 ]
+
 rm -f 1 1.saved dwz.err