From c8185dcb4d1952a5d26e1b228d88ca737d41021b Mon Sep 17 00:00:00 2001
From: Patrick McDermott <patrick.mcdermott@libiquity.com>
Date: Tue, 30 Jul 2019 00:25:04 -0400
Subject: build: Use timing hardening flags

---
diff --git a/configure.ac b/configure.ac
index 85e7f4a..be1e513 100644
--- a/configure.ac
+++ b/configure.ac
@@ -84,6 +84,11 @@ if test "x${address_sanitization}" = 'xyes'; then
 	AC_SUBST([ASAN_CFLAGS])
 fi
 
+AX_CHECK_COMPILE_FLAG([-DTFM_TIMING_RESISTANT],
+	[AX_APPEND_FLAG([-DTFM_TIMING_RESISTANT])])
+AX_CHECK_COMPILE_FLAG([-DECC_TIMING_RESISTANT],
+	[AX_APPEND_FLAG([-DECC_TIMING_RESISTANT])])
+
 PKG_PROG_PKG_CONFIG()
 PKG_CHECK_MODULES([WOLFSSL], [wolfssl])
 WOLFSSL_CFLAGS="$(printf ' %s' "${WOLFSSL_CFLAGS}" | \
--
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