configure: standardise include path

[urcu.git] / configure.ac

diff --git a/configure.ac b/configure.ac
index e6b9211c87a76ecf44884768b8c446a7f2cbf768..2b7ace568b60eddb682ea5c34d9d814d672accc6 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -238,7 +238,10 @@ AC_SUBST([URCU_LIBRARY_VERSION], [urcu_lib_version])
 
 AC_SUBST(LT_NO_UNDEFINED)
 
-AM_CPPFLAGS="-include config.h"
+# The order in which the include folders are searched is important.
+# The top_builddir should always be searched first in the event that a build
+# time generated file is included.
+AM_CPPFLAGS="-I\$(top_builddir)/include -I\$(top_srcdir)/include -include config.h"
 AC_SUBST(AM_CPPFLAGS)
 
 AM_CFLAGS="-Wall -Wextra -Wno-unused-parameter $PTHREAD_CFLAGS"