malloc: Run tests without calling mallopt [BZ #19469]

The compiled tests no longer refer to the mallopt symbol
from their main functions.  (Some tests still call mallopt
explicitly, which is fine.)

ChangeLog

@@ -1,3 +1,10 @@
+2016-08-02  Florian Weimer  <fweimer@redhat.com>
+
+	[BZ #19469]
+	* malloc/Makefile (CPPFLAGS): Compile tests with
+	-DTEST_NO_MALLOPT.
+	* test-skeleton.c (main): Only call mallopt if !TEST_NO_MALLOPT.
+
 2016-08-02  Andrew Senkevich  <andrew.senkevich@intel.com>
 
 	[BZ #20033]

malloc/Makefile

@@ -166,3 +166,7 @@ $(objpfx)libmemusage.so: $(libdl)
 
 # Extra dependencies
 $(foreach o,$(all-object-suffixes),$(objpfx)malloc$(o)): arena.c hooks.c
+
+# Compile the tests with a flag which suppresses the mallopt call in
+# the test skeleton.
+$(tests:%=$(objpfx)%.o): CPPFLAGS += -DTEST_NO_MALLOPT

test-skeleton.c

@@ -346,8 +346,10 @@ main (int argc, char *argv[])
   unsigned int timeoutfactor = 1;
   pid_t termpid;
 
+#ifndef TEST_NO_MALLOPT
   /* Make uses of freed and uninitialized memory known.  */
   mallopt (M_PERTURB, 42);
+#endif
 
 #ifdef STDOUT_UNBUFFERED
   setbuf (stdout, NULL);