[PATCH libdrm] Add configure option --with/--without-valgrind

[Daniel Martin <consume.noise@gmail.com>]

Add a configure option --with/--without-valgrind to be able to compile
libdrm with or without valgrind. The latter was not possible if
pkgconfig found the valgrind package.
---
 configure.ac |   18 ++++++++++++++++--
 1 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/configure.ac b/configure.ac
index 09fed53..0776320 100644
--- a/configure.ac
+++ b/configure.ac
@@ -292,8 +292,21 @@ fi
 AC_SUBST(PCIACCESS_CFLAGS)
 AC_SUBST(PCIACCESS_LIBS)
 
-PKG_CHECK_MODULES(VALGRIND, [valgrind], [have_valgrind=yes], [have_valgrind=no])
-if test "x$have_valgrind" = "xyes"; then
+AC_ARG_WITH(valgrind,
+	      AS_HELP_STRING([--with-valgrind],
+	      [Enable support for valgrind (default: auto)]),
+	      [VALGRIND=$with_valgrind], [VALGRIND=auto])
+
+if test "x$VALGRIND" = "xauto"; then
+	PKG_CHECK_MODULES(VALGRIND, [valgrind], [VALGRIND=yes], [VALGRIND=no])
+else
+	if test "x$VALGRIND" = "xyes"; then
+		VALGRIND=yes
+	else
+		VALGRIND=no
+	fi
+fi
+if test "x$VALGRIND" = "xyes"; then
 	AC_DEFINE([HAVE_VALGRIND], 1, [Use valgrind intrinsics to suppress false warnings])
 fi
 
@@ -340,6 +353,7 @@ echo ""
 echo "$PACKAGE_STRING will be compiled with:"
 echo ""
 echo "  libkms         $LIBKMS"
+echo "  valgrind       $VALGRIND"
 echo "  Intel API      $INTEL"
 echo "  vmwgfx API     $VMWGFX"
 echo "  Radeon API     $RADEON"
-- 
1.7.2.5