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dnl file : m4/diff.m4
dnl copyright : Copyright (c) 2013-2017 Code Synthesis Tools CC
dnl license : MIT; see accompanying LICENSE file
dnl
dnl DIFF_TOOL
dnl
AC_DEFUN([DIFF_TOOL], [
diff_found=no
AC_ARG_VAR([DIFF],[diff command])
AC_ARG_VAR([DIFFFLAGS],[diff flags])
AC_ARG_WITH(
[diff],
[AC_HELP_STRING([--with-diff=PATH],[path to the diff program])],
[diff_path=${withval}],
[diff_path=])
AC_MSG_CHECKING([for diff])
if test x"$DIFF" = x; then
if test x"$diff_path" != x; then
AS_SET_CATFILE([abs_diff_path], [$ac_pwd], [$diff_path])
DIFF="$abs_diff_path"
else
DIFF=diff
fi
fi
cat >conftest.txt
$DIFF conftest.txt conftest.txt 2>/dev/null 1>&2
if test x"$?" = x0; then
AC_MSG_RESULT([$DIFF])
else
AC_MSG_RESULT([no])
AC_MSG_ERROR([diff command is not found; consider setting the DIFF variable or using --with-diff=PATH])
fi
AC_MSG_CHECKING([whether $DIFF accepts -u])
$DIFF -u conftest.txt conftest.txt 2>/dev/null 1>&2
if test x"$?" = x0; then
AC_MSG_RESULT([yes])
DIFFFLAGS="$DIFFFLAGS -u"
else
AC_MSG_RESULT([no])
fi
rm -f conftest.txt
])dnl
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