Add libgmp 6.2.0 to third_party
Don't build it yet. That will come in the next review.
Change-Id: Idf3266558165e5ab45f4a41c98cc8c838c8244d5
diff --git a/third_party/gmp/mpz/realloc.c b/third_party/gmp/mpz/realloc.c
new file mode 100644
index 0000000..bb55bf6
--- /dev/null
+++ b/third_party/gmp/mpz/realloc.c
@@ -0,0 +1,78 @@
+/* _mpz_realloc -- make the mpz_t have NEW_ALLOC digits allocated.
+
+Copyright 1991, 1993-1995, 2000, 2001, 2008, 2015 Free Software
+Foundation, Inc.
+
+This file is part of the GNU MP Library.
+
+The GNU MP Library is free software; you can redistribute it and/or modify
+it under the terms of either:
+
+ * the GNU Lesser General Public License as published by the Free
+ Software Foundation; either version 3 of the License, or (at your
+ option) any later version.
+
+or
+
+ * the GNU General Public License as published by the Free Software
+ Foundation; either version 2 of the License, or (at your option) any
+ later version.
+
+or both in parallel, as here.
+
+The GNU MP Library is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+for more details.
+
+You should have received copies of the GNU General Public License and the
+GNU Lesser General Public License along with the GNU MP Library. If not,
+see https://www.gnu.org/licenses/. */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include "gmp-impl.h"
+
+void *
+_mpz_realloc (mpz_ptr m, mp_size_t new_alloc)
+{
+ mp_ptr mp;
+
+ /* Never allocate zero space. */
+ new_alloc = MAX (new_alloc, 1);
+
+ if (sizeof (mp_size_t) == sizeof (int))
+ {
+ if (UNLIKELY (new_alloc > ULONG_MAX / GMP_NUMB_BITS))
+ {
+ fprintf (stderr, "gmp: overflow in mpz type\n");
+ abort ();
+ }
+ }
+ else
+ {
+ if (UNLIKELY (new_alloc > INT_MAX))
+ {
+ fprintf (stderr, "gmp: overflow in mpz type\n");
+ abort ();
+ }
+ }
+
+ if (ALLOC (m) == 0)
+ {
+ mp = __GMP_ALLOCATE_FUNC_LIMBS (new_alloc);
+ }
+ else
+ {
+ mp = __GMP_REALLOCATE_FUNC_LIMBS (PTR (m), ALLOC (m), new_alloc);
+
+ /* Don't create an invalid number; if the current value doesn't fit after
+ reallocation, clear it to 0. */
+ if (UNLIKELY (ABSIZ (m) > new_alloc))
+ SIZ (m) = 0;
+ }
+
+ PTR (m) = mp;
+ ALLOC(m) = new_alloc;
+ return (void *) mp;
+}