Don't print debugging messages to stdout.

There is some debugging code in cxa_demangle.cpp that prints messages on
stdout. In general this is not safe, as the program itself may use
stdout to write its output. Change this code to write to stderr.

Differential Revision:	http://reviews.llvm.org/D8167

llvm-svn: 232716

diff --git a/libcxxabi/src/cxa_demangle.cpp b/libcxxabi/src/cxa_demangle.cpp
index 1344f43..789d577 100644 (file)
--- a/libcxxabi/src/cxa_demangle.cpp
+++ b/libcxxabi/src/cxa_demangle.cpp
@@ -55,51 +55,51 @@ template <class C>
 void
 print_stack(const C& db)
 {
-    printf("---------\n");
-    printf("names:\n");
+    fprintf(stderr, "---------\n");
+    fprintf(stderr, "names:\n");
     for (auto& s : db.names)
-        printf("{%s#%s}\n", s.first.c_str(), s.second.c_str());
+        fprintf(stderr, "{%s#%s}\n", s.first.c_str(), s.second.c_str());
     int i = -1;
-    printf("subs:\n");
+    fprintf(stderr, "subs:\n");
     for (auto& v : db.subs)
     {
         if (i >= 0)
-            printf("S%i_ = {", i);
+            fprintf(stderr, "S%i_ = {", i);
         else
-            printf("S_  = {");
+            fprintf(stderr, "S_  = {");
         for (auto& s : v)
-            printf("{%s#%s}", s.first.c_str(), s.second.c_str());
-        printf("}\n");
+            fprintf(stderr, "{%s#%s}", s.first.c_str(), s.second.c_str());
+        fprintf(stderr, "}\n");
         ++i;
     }
-    printf("template_param:\n");
+    fprintf(stderr, "template_param:\n");
     for (auto& t : db.template_param)
     {
-        printf("--\n");
+        fprintf(stderr, "--\n");
         i = -1;
         for (auto& v : t)
         {
             if (i >= 0)
-                printf("T%i_ = {", i);
+                fprintf(stderr, "T%i_ = {", i);
             else
-                printf("T_  = {");
+                fprintf(stderr, "T_  = {");
             for (auto& s : v)
-                printf("{%s#%s}", s.first.c_str(), s.second.c_str());
-            printf("}\n");
+                fprintf(stderr, "{%s#%s}", s.first.c_str(), s.second.c_str());
+            fprintf(stderr, "}\n");
             ++i;
         }
     }
-    printf("---------\n\n");
+    fprintf(stderr, "---------\n\n");
 }
 
 template <class C>
 void
 print_state(const char* msg, const char* first, const char* last, const C& db)
 {
-    printf("%s: ", msg);
+    fprintf(stderr, "%s: ", msg);
     for (; first != last; ++first)
-        printf("%c", *first);
-    printf("\n");
+        fprintf(stderr, "%c", *first);
+    fprintf(stderr, "\n");
     print_stack(db);
 }