re PR gcov-profile/55650 (Firefox profiledbuild: libxul.so: cannot map…

re PR gcov-profile/55650 (Firefox profiledbuild:  libxul.so: cannot map zero-fill pages: Cannot allocate memory)

	PR gcov-profile/55650
	* coverage.c (coverage_obj_init): Return false if no functions
	are being emitted.

	* g++.dg/other/pr55650.C: New test.
	* g++.dg/other/pr55650.cc: New file.

From-SVN: r194470

gcc/ChangeLog

+2012-12-13  Jakub Jelinek  <jakub@redhat.com>
+
+	PR gcov-profile/55650
+	* coverage.c (coverage_obj_init): Return false if no functions
+	are being emitted.
+
 2012-12-13  Steven Bosscher  <steven@gcc.gnu.org>
 
 	* bitmap.c (struct bitmap_descriptor): Remove forward declaration.

gcc/coverage.c

@@ -999,6 +999,9 @@ coverage_obj_init (void)
       /* The function is not being emitted, remove from list.  */
       *fn_prev = fn->next;
 
+  if (functions_head == NULL)
+    return false;
+
   for (ix = 0; ix != GCOV_COUNTERS; ix++)
     if ((1u << ix) & prg_ctr_mask)
       n_counters++;

gcc/testsuite/ChangeLog

+2012-12-13  Jakub Jelinek  <jakub@redhat.com>
+
+	PR gcov-profile/55650
+	* g++.dg/other/pr55650.C: New test.
+	* g++.dg/other/pr55650.cc: New file.
+
 2012-12-12  Jakub Jelinek  <jakub@redhat.com>
 
 	PR debug/55665

gcc/testsuite/g++.dg/other/pr55650.C

+// PR gcov-profile/55650
+// { dg-do link }
+// { dg-options "-O2 -fprofile-generate" }
+// { dg-additional-sources "pr55650.cc" }
+
+struct A
+{
+  virtual void foo ();
+};
+
+struct B : public A
+{
+  B ();
+  void foo () {}
+};
+
+inline A *
+bar ()
+{
+  return new B;
+}

gcc/testsuite/g++.dg/other/pr55650.cc

+int
+main ()
+{
+}