From 1e80c6d2361cf4e4c8891c4af35c84a630b622e7 Mon Sep 17 00:00:00 2001
From: Andrew Waterman <andrew@sifive.com>
Date: Mon, 5 Jun 2017 12:55:26 -0700
Subject: [PATCH] Configure should fail if device-tree-compiler is not
 installed

Fixes #107
---
 configure    | 4 ++++
 configure.ac | 3 ++-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/configure b/configure
index 77bab30..015f63e 100755
--- a/configure
+++ b/configure
@@ -3409,6 +3409,7 @@ done
   done
 IFS=$as_save_IFS
 
+  test -z "$ac_cv_path_DTC" && ac_cv_path_DTC="no"
   ;;
 esac
 fi
@@ -3422,6 +3423,9 @@ $as_echo "no" >&6; }
 fi
 
 
+if test x"$DTC" == xno; then :
+  as_fn_error $? "device-tree-compiler not found" "$LINENO" 5
+fi
 
 cat >>confdefs.h <<_ACEOF
 #define DTC "$DTC"
diff --git a/configure.ac b/configure.ac
index ea64de7..e361877 100644
--- a/configure.ac
+++ b/configure.ac
@@ -51,7 +51,8 @@ AC_PROG_CC
 AC_PROG_CXX
 AC_CHECK_TOOL([AR],[ar])
 AC_CHECK_TOOL([RANLIB],[ranlib])
-AC_PATH_PROG([DTC],[dtc])
+AC_PATH_PROG([DTC],[dtc],[no])
+AS_IF([test x"$DTC" == xno],AC_MSG_ERROR([device-tree-compiler not found]))
 AC_DEFINE_UNQUOTED(DTC, ["$DTC"], [Path to the device-tree-compiler])
 
 AC_C_BIGENDIAN(AC_MSG_ERROR([Spike requires a little-endian host]))
-- 
2.30.2