Fix build breakage in gdb/xml-support.c

The buildbots are showing that the previous change to
xml_fetch_content_from_file causes __wur warnings/errors:

  ../../binutils-gdb/gdb/xml-support.c: In function gdb::unique_xmalloc_ptr<char> xml_fetch_content_from_file(const char*, void*):
  ../../binutils-gdb/gdb/xml-support.c:1028:43: error: ignoring return value of size_t fread(void*, size_t, size_t, FILE*), declared with attribute warn_unused_result [-Werror=unused-result]
     fread (text.get (), 1, len, file.get ());
					     ^

This commit fixes it.

gdb/ChangeLog:
2017-10-19  Pedro Alves  <palves@redhat.com>

	* xml-support.c (xml_fetch_content_from_file): Check fread's
	return.

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 6625a03..aaf0485 100644 (file)
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,10 @@
 2017-10-19  Pedro Alves  <palves@redhat.com>
 
+       * xml-support.c (xml_fetch_content_from_file): Check fread's
+       return.
+
+2017-10-19  Pedro Alves  <palves@redhat.com>
+
        * ser-base.c (ser_base_read_error_fd): Delete the file handler if
        async.
        (handle_error_fd): New function.

diff --git a/gdb/xml-support.c b/gdb/xml-support.c
index 1f53d7a..2b59180 100644 (file)
--- a/gdb/xml-support.c
+++ b/gdb/xml-support.c
@@ -1025,8 +1025,8 @@ xml_fetch_content_from_file (const char *filename, void *baton)
 
   gdb::unique_xmalloc_ptr<char> text ((char *) xmalloc (len + 1));
 
-  fread (text.get (), 1, len, file.get ());
-  if (ferror (file.get ()))
+  if (fread (text.get (), 1, len, file.get ()) != len
+      || ferror (file.get ()))
     {
       warning (_("Read error from \"%s\""), filename);
       return NULL;