[PATCH 12/22] autotools.bbclass: make it possible to inhibit m4 deletion

["Alexander Kanavin" <alex.kanavin@gmail.com>]

This is need in particular for the new version of bash,
which showcases the might of autotools by shipping local
instances of aclocal.m4 and gettext m4 files in the source tree
which are customized and impossible to regenerate.

Signed-off-by: Alexander Kanavin <alex.kanavin@gmail.com>
---
 meta/classes/autotools.bbclass | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/meta/classes/autotools.bbclass b/meta/classes/autotools.bbclass
index 2ceb790b5c..b321825eed 100644
--- a/meta/classes/autotools.bbclass
+++ b/meta/classes/autotools.bbclass
@@ -224,9 +224,11 @@ autotools_do_configure() {
 			intltoolize --copy --force --automake
 		fi
 
-		for i in $PRUNE_M4; do
-			find ${S} -ignore_readdir_race -name $i -delete
-		done
+		if [ "${INHIBIT_PRUNE_M4}" = "" ]; then
+			for i in $PRUNE_M4; do
+				find ${S} -ignore_readdir_race -name $i -delete
+			done
+		fi
 
 		bbnote Executing ACLOCAL=\"$ACLOCAL\" autoreconf -Wcross --verbose --install --force ${EXTRA_AUTORECONF} $acpaths
 		ACLOCAL="$ACLOCAL" autoreconf -Wcross --verbose --install --force ${EXTRA_AUTORECONF} $acpaths || die "autoreconf execution failed."
-- 
2.29.2