PR tree-optimization/79699 - small memory leak in MPFR

gcc/ChangeLog:
	* context.c (context::~context): Free MPFR caches to avoid
	a memory leak on program exit.

From-SVN: r245878

gcc/ChangeLog

+2017-03-03  Martin Sebor  <msebor@redhat.com>
+
+	PR tree-optimization/79699
+	* context.c (context::~context): Free MPFR caches to avoid
+	a memory leak on program exit.
+
 2017-03-03  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
 
 	* config/aarch64/aarch64.c (aarch64_float_const_representable_p):

gcc/context.c

@@ -23,6 +23,7 @@ along with GCC; see the file COPYING3.  If not see
 #include "context.h"
 #include "pass_manager.h"
 #include "dumpfile.h"
+#include "realmpfr.h"
 
 /* The singleton holder of global state: */
 gcc::context *g;
@@ -42,4 +43,7 @@ gcc::context::~context ()
 {
   delete m_passes;
   delete m_dumps;
+
+  /* Release MPFR caches to avoid Valgrind leak reports.  */
+  mpfr_free_cache ();
 }