From 1670d9df4d572bd6836ce2e74ff75cb7fd63cd54 Mon Sep 17 00:00:00 2001
From: Evan Lloyd <evan.lloyd@arm.com>
Date: Wed, 2 Dec 2015 18:41:22 +0000
Subject: [PATCH] Make:Diagnostic fail if no eval

To help diagnose make problems, we report an error if the make
program used does not provide the $(eval ) make functionality.
This will detect early versions of GNU make and other make programs.

Change-Id: I0ebb0f63694cf0b04eaeb7ea1e9e172fb9770ce0
---
 make_helpers/build_macros.mk | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/make_helpers/build_macros.mk b/make_helpers/build_macros.mk
index 274f365a..42e11b3f 100644
--- a/make_helpers/build_macros.mk
+++ b/make_helpers/build_macros.mk
@@ -28,6 +28,12 @@
 # POSSIBILITY OF SUCH DAMAGE.
 #
 
+# Report an error if the eval make function is not available.
+$(eval eval_available := T)
+ifneq (${eval_available},T)
+    $(error This makefile only works with a Make program that supports $$(eval))
+endif
+
 # Some utility macros for manipulating awkward (whitespace) characters.
 blank			:=
 space			:=${blank} ${blank}
-- 
2.30.2