Honour errors when processing more than one file

When using dwz -L0 on a hello world a.out, it fails:
...
$ dwz -L0 a.out
$ echo $?
1
...

But when we do the same for a.out and a copy b.out, it passes:
...
$ cp a.out b.out
$ dwz -L0 a.out b.out
$ echo $?
0
...

Fix this by honouring dwz return codes when processing more than one file.

2019-03-04  Tom de Vries  <tdevries@suse.de>

	PR dwz/24301
	* dwz.c (main): Handle dwz returning 1 if processing more than one file.
	* testsuite/dwz.tests/two-files-too-many-dies.sh: New test.

---
 Makefile                                       |  5 ++++-
 dwz.c                                          |  2 ++
 hello.c                                        | 14 ++++++++++++++
 testsuite/dwz.tests/two-files-too-many-dies.sh | 22 ++++++++++++++++++++++
 4 files changed, 42 insertions(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index b318fd7..4b37732 100644
--- a/Makefile
+++ b/Makefile
@@ -17,11 +17,14 @@ clean:
 
 PWD:=$(shell pwd -P)
 
-TEST_EXECS = hello
+TEST_EXECS = hello hello2
 
 hello:
 	$(CC) hello.c -o $@ -g
 
+hello2:
+	$(CC) hello.c -o $@ -DWITH_STRUCT -g
+
 check: dwz $(TEST_EXECS)
 	mkdir -p testsuite-bin
 	cd testsuite-bin; ln -sf $(PWD)/dwz .
diff --git a/dwz.c b/dwz.c
index d348418..e82d6a7 100644
--- a/dwz.c
+++ b/dwz.c
@@ -11940,6 +11940,8 @@ main (int argc, char *argv[])
 	    }
 	  else if (resa[i - optind].res == 0)
 	    successcount++;
+	  else if (thisret == 1)
+	    ret = 1;
 	  if (hardlink
 	      && resa[i - optind].res >= 0
 	      && resa[i - optind].nlink > 1)
diff --git a/hello.c b/hello.c
index 82d070e..ee65515 100644
--- a/hello.c
+++ b/hello.c
@@ -1,8 +1,22 @@
 #include <stdio.h>
 
+#ifdef WITH_STRUCT
+struct a {
+  int a;
+  char *p;
+};
+
+struct a a;
+#endif
+
 int
 main (void)
 {
+#ifdef WITH_STRUCT
+  a.p = "hello";
+  printf ("%s\n", a.p);
+#else
   printf ("hello\n");
+#endif
   return 0;
 }
diff --git a/testsuite/dwz.tests/two-files-too-many-dies.sh b/testsuite/dwz.tests/two-files-too-many-dies.sh
new file mode 100755
index 0000000..da86d23
--- /dev/null
+++ b/testsuite/dwz.tests/two-files-too-many-dies.sh
@@ -0,0 +1,22 @@
+#!/bin/sh
+
+set -e
+
+cp ../hello 1
+cp ../hello2 2
+
+limit=$(readelf -w 2 | grep '(DW_TAG' | wc -l)
+limit=$((limit - 1))
+
+if dwz -L$limit 2 1 2>/dev/null; then
+    exit 1
+fi
+
+smaller-than.sh 1 ../hello
+cmp 2 ../hello2
+
+ls=$(ls)
+ls=$(echo $ls)
+[ "$ls" = "1 2" ]
+
+rm -f 1 2