build: tweak do_m4.bash

Reduce includes which are no longer needed.  Now that we use the absolute paths
as arguments, we only need the top level include for the miscellaneous includes.
This ideally would have been a part of the previous commit.

1 files changed, 6 insertions, 2 deletions

diff --git a/misc/do_m4.bash b/misc/do_m4.bash
index a924d93..1b8c1ab 100755
--- a/misc/do_m4.bash
+++ b/misc/do_m4.bash
@@ -16,8 +16,12 @@ get_m4() {
     kill $KILL_PID
 }
 
-echo ">>> $(get_m4) -I. -I.. -I../.. -E ${1} > ${2}"
-if ! $(get_m4) -I. -I.. -I../.. -E ${1} > ${2} ; then
+get_abs_top_srcdir() {
+    echo "$(dirname $(dirname "${0}"))"
+}
+
+echo ">>> $(get_m4) -I $(get_abs_top_srcdir) -E ${1} > ${2}"
+if ! $(get_m4) -I $(get_abs_top_srcdir) -E ${1} > ${2} ; then
     echo "oops!" 1>&2
     exit 127
 fi