sane_grep: pass "-a" if grep accepts it

diff --git a/configure.ac b/configure.ac
index 1f55009bba756322dca30cd945d2695666422a71..6fd7b8edce348ec5cacd2fb8f1d8b1f5c7490ae0 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -471,6 +471,13 @@ if test -n "$ASCIIDOC"; then
        esac
 fi
 
+if grep -a ascii configure.ac >/dev/null; then
+  AC_MSG_RESULT([Using 'grep -a' for sane_grep])
+  SANE_TEXT_GREP=-a
+else
+  SANE_TEXT_GREP=
+fi
+GIT_CONF_SUBST([SANE_TEXT_GREP])
 
 ## Checks for libraries.
 AC_MSG_NOTICE([CHECKS for libraries])