From d717a67ff4a59d0c2cc108cedbecdc20b4c9fb97 Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Fri, 5 Oct 2012 10:27:26 +0100
Subject: [PATCH] configure: Make rebuilding of the gen4 assembly files
 explicit

References: https://bugs.freedesktop.org/show_bug.cgi?id=55646
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 configure.ac | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index c961d856..3ecf7ad4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -81,8 +81,19 @@ else
   fi
 fi
 
+AC_ARG_ENABLE(gen4asm,
+              AS_HELP_STRING([--enable-gen4asm],
+			     [Enable rebuilding the gen4 assembly files [default=no]]),
+              [ASM="$enableval"],
+              [ASM=no])
 
-PKG_CHECK_MODULES(GEN4ASM, [intel-gen4asm >= 1.2], [gen4asm=yes], [gen4asm=no])
+gen4asm=no
+if test x$ASM != "xno"; then
+	PKG_CHECK_MODULES(GEN4ASM, [intel-gen4asm >= 1.2], [gen4asm=yes], [gen4asm=no])
+	if test x$ASM = "xyes" -a x$gen4asm != "xyes"; then
+		AC_MSG_ERROR([intel-gen4asm support requested but not found])
+	fi
+fi
 AM_CONDITIONAL(HAVE_GEN4ASM, test x$gen4asm = xyes)
 
 AC_ARG_ENABLE(udev,