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-rw-r--r--runtime/libprofile/GCDAProfiling.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/runtime/libprofile/GCDAProfiling.c b/runtime/libprofile/GCDAProfiling.c
index 2c373484bb..32d19ad774 100644
--- a/runtime/libprofile/GCDAProfiling.c
+++ b/runtime/libprofile/GCDAProfiling.c
@@ -110,14 +110,14 @@ void llvm_gcda_start_file(const char *orig_filename) {
char *filename;
filename = mangle_filename(orig_filename);
recursive_mkdir(filename);
- output_file = fopen(filename, "wb");
+ output_file = fopen(filename, "w+b");
if (!output_file) {
const char *cptr = strrchr(orig_filename, '/');
- output_file = fopen(cptr ? cptr + 1 : orig_filename, "wb");
+ output_file = fopen(cptr ? cptr + 1 : orig_filename, "w+b");
if (!output_file) {
- fprintf(stderr, "LLVM profiling runtime: while opening '%s': ",
+ fprintf(stderr, "LLVM profiling runtime: cannot open '%s': ",
cptr ? cptr + 1 : orig_filename);
perror("");
return;