autoconfiguration test whether less(1) supports the -T option;

needed for Alpine Linux because it uses busybox less(1) by default;
based on a patch from Daniel Sabogal explained to me by Natanael Copa

1 files changed, 17 insertions, 1 deletions

diff --git a/configure b/configure
index 5dca7ad8..5300ef20 100755
--- a/configure
+++ b/configure
@@ -1,6 +1,6 @@
 #!/bin/sh
 #
-# $Id: configure,v 1.68 2019/03/04 13:01:57 schwarze Exp $
+# $Id: configure,v 1.69 2019/03/06 10:18:58 schwarze Exp $
 #
 # Copyright (c) 2014-2019 Ingo Schwarze <schwarze@openbsd.org>
 #
@@ -65,6 +65,7 @@ HAVE_FTS_COMPARE_CONST=
 HAVE_GETLINE=
 HAVE_GETSUBOPT=
 HAVE_ISBLANK=
+HAVE_LESS_T=
 HAVE_MKDTEMP=
 HAVE_NANOSLEEP=
 HAVE_NTOHL=
@@ -334,6 +335,20 @@ else
 	runtest fts FTS || true
 fi
 
+if ismanual "less -T" LESS_T ${HAVE_LESS_T}; then
+	:
+elif less -ET /dev/null test-noop.c 1>/dev/null 2>&3; then
+	HAVE_LESS_T=1
+	echo "tested less -T: yes" 1>&2
+	echo "tested less -T: yes" 1>&3
+	echo 1>&3
+else
+	HAVE_LESS_T=0
+	echo "tested less -T: no" 1>&2
+	echo "tested less -T: no" 1>&3
+	echo 1>&3
+fi
+
 # --- wide character and locale support ---
 if get_locale; then
 	singletest wchar WCHAR -DUTF8_LOCALE=\"${UTF8_LOCALE}\" || \
@@ -462,6 +477,7 @@ cat << __HEREDOC__
 #define HAVE_GETLINE ${HAVE_GETLINE}
 #define HAVE_GETSUBOPT ${HAVE_GETSUBOPT}
 #define HAVE_ISBLANK ${HAVE_ISBLANK}
+#define HAVE_LESS_T ${HAVE_LESS_T}
 #define HAVE_MKDTEMP ${HAVE_MKDTEMP}
 #define HAVE_NTOHL ${HAVE_NTOHL}
 #define HAVE_PLEDGE ${HAVE_PLEDGE}