PR gcov-profile/58602

        * gcc/gcov-io.c (gcov_open): Open with truncation when mode<0

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@207441 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 8 insertions, 2 deletions

diff --git a/gcc/gcov-io.c b/gcc/gcov-io.c
index b710f596e37..5ef82f68372 100644
--- a/gcc/gcov-io.c
+++ b/gcc/gcov-io.c
@@ -149,9 +149,15 @@ gcov_open (const char *name, int mode)
       /* pass mode (ignored) for compatibility */
       fd = open (name, O_RDONLY, S_IRUSR | S_IWUSR);
     }
-  else
+  else if (mode < 0)
+     {
+       /* Write mode - acquire a write-lock.  */
+       s_flock.l_type = F_WRLCK;
+      fd = open (name, O_RDWR | O_CREAT | O_TRUNC, 0666);
+    }
+  else /* mode == 0 */
     {
-      /* Write mode - acquire a write-lock.  */
+      /* Read-Write mode - acquire a write-lock.  */
       s_flock.l_type = F_WRLCK;
       fd = open (name, O_RDWR | O_CREAT, 0666);
     }