From 2c66f364a761b7d0cfe766953aeb5d1f5921950d Mon Sep 17 00:00:00 2001
From: Ben Gamari <ben@well-typed.com>
Date: Thu, 21 Nov 2019 15:29:51 -0500
Subject: configure: Fix HAVE_C11_ATOMICS macro

Previously we were using AC_DEFINE instead of
AC_DEFINE_UNQUOTED, resulted in the variable not being
interpolated.

Fixes #17505.
---
 configure.ac | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 5e6f7d8723..8d5900cc33 100644
--- a/configure.ac
+++ b/configure.ac
@@ -715,7 +715,9 @@ FP_GCC_SUPPORTS_NO_PIE
 dnl ** Used to determine how to compile ghc-prim's atomics.c, used by
 dnl    unregisterised, Sparc, and PPC backends.
 FP_GCC_SUPPORTS__ATOMICS
-AC_DEFINE([HAVE_C11_ATOMICS], [$CONF_GCC_SUPPORTS__ATOMICS], [Does GCC support __atomic primitives?])
+if test $CONF_GCC_SUPPORTS__ATOMICS = YES ; then
+  AC_DEFINE([HAVE_C11_ATOMICS], [1], [Does GCC support __atomic primitives?])
+fi
 
 FP_GCC_EXTRA_FLAGS
 
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