From 4e90f3185aea9160c28f3eaec5625b67fc0f67db Mon Sep 17 00:00:00 2001
From: Daniel Green <ddgreen@gmail.com>
Date: Sun, 9 Feb 2020 11:06:53 -0500
Subject: [PATCH] Build+test bn_mp_set_double.c on more platforms

Not all platforms/environments/architectures that support enough of
IEEE 754 for the purposes of mp_set_double() actually support enough
to legitimately define __STDC_IEC_559__, so only relying on that is
too strict. Fixes https://github.com/libtom/libtommath/issues/159

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
[Retrieved (and backported) from:
https://github.com/libtom/libtommath/commit/4e90f3185aea9160c28f3eaec5625b67fc0f67db]
---
 demo/test.c     | 2 +-
 bn_mp_set_double.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/demo/test.c b/demo/test.c
index 998f14b3..f719709d 100644
--- a/demo/test.c
+++ b/demo/test.c
@@ -522,7 +522,7 @@ static int test_mp_invmod(void)
 
 }
 
-#if defined(__STDC_IEC_559__) || defined(__GCC_IEC_559)
+#if defined(__STDC_IEC_559__) || defined(__GCC_IEC_559) || defined(__x86_64__) || defined(_M_X64) || defined(_M_AMD64) || defined(__i386__) || defined(_M_X86) || defined(__aarch64__) || defined(__arm__)
 static int test_mp_set_double(void)
 {
    int i;
diff --git a/mp_set_double.c b/mp_set_double.c
index 78550c8f..cdc644d9 100644
--- a/bn_mp_set_double.c
+++ b/bn_mp_set_double.c
@@ -3,7 +3,7 @@
 /* LibTomMath, multiple-precision integer library -- Tom St Denis */
 /* SPDX-License-Identifier: Unlicense */
 
-#if defined(__STDC_IEC_559__) || defined(__GCC_IEC_559)
+#if defined(__STDC_IEC_559__) || defined(__GCC_IEC_559) || defined(__x86_64__) || defined(_M_X64) || defined(_M_AMD64) || defined(__i386__) || defined(_M_X86) || defined(__aarch64__) || defined(__arm__)
 mp_err mp_set_double(mp_int *a, double b)
 {
    uint64_t frac;