build: slim down autoconf-archive macro search

Only copy in files that define the macros we need and not ones that
reference the macros.  This avoids copying a lot unused files in.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

1 files changed, 10 insertions, 3 deletions

diff --git a/autogen.sh b/autogen.sh
index e583300..432152b 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -10,11 +10,18 @@ rm -f m4/*.m4
 # not everyone has sys-devel/autoconf-archive installed
 has() { [[ " ${*:2} " == *" $1 "* ]] ; }
 import_ax() {
-	local macro content m4 lm4s=()
+	local macro content m4 found lm4s=()
 	content=$(sed -e '/^[[:space:]]*#/d' -e 's:\<dnl\>.*::' "$@")
 	for macro in $(echo "${content}" | grep -o '\<AX[A-Z_]*\>' | sort -u) ; do
-		for m4 in $(grep -rl "\[${macro}\]" /usr/share/aclocal/) ; do
-			has ${m4} "${m4s[@]}" || lm4s+=( ${m4} )
+		if ! found=$(grep -rl "AC_DEFUN(\[${macro}\]" /usr/share/aclocal/) ; then
+			echo "error: ${macro}: unable to locate m4 definition"
+			exit 1
+		fi
+		for m4 in ${found} ; do
+			if ! has ${m4} "${m4s[@]}" "${lm4s[@]}" ; then
+				echo "$*: ${macro}: ${m4}"
+				lm4s+=( ${m4} )
+			fi
 		done
 	done
 	if [[ ${#lm4s[@]} -gt 0 ]] ; then