| dnl Copyright 2002-2025 Free Software Foundation, Inc. |
| dnl |
| dnl This file is free software; as a special exception the author gives |
| dnl unlimited permission to copy and/or distribute it, with or without |
| dnl modifications, as long as this notice is preserved. |
| dnl |
| dnl This program is distributed in the hope that it will be useful, but |
| dnl WITHOUT ANY WARRANTY, to the extent permitted by law; without even the |
| dnl implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
| |
| AC_DEFUN([txi_DIFF_OPTIONS], |
| [ |
| # check whether diff accepts the -u option (not on HP-UX). |
| AC_MSG_CHECKING(whether diff accepts -u) |
| diff_accepts_u_option=no |
| echo foo >conftest.dtx |
| echo foo | diff -u - conftest.dtx >/dev/null 2>&1 |
| error_status_diff_u=$? |
| if test $error_status_diff_u = 0; then |
| diff_accepts_u_option=yes |
| fi |
| AC_MSG_RESULT($diff_accepts_u_option) |
| rm -f conftest.dtx |
| |
| DIFF_U_OPTION= |
| if test "z$diff_accepts_u_option" = 'zyes' ; then |
| DIFF_U_OPTION=-u |
| fi |
| |
| # check whether diff accepts the -a option (only needed for GNU diff). |
| AC_MSG_CHECKING(whether diff accepts -a) |
| diff_accepts_a_option=no |
| echo foo >conftest.dtx |
| echo foo | diff -a - conftest.dtx >/dev/null 2>&1 |
| error_status_diff_a=$? |
| if test $error_status_diff_a = 0; then |
| diff_accepts_a_option=yes |
| fi |
| AC_MSG_RESULT($diff_accepts_a_option) |
| rm -f conftest.dtx |
| |
| DIFF_A_OPTION= |
| if test "z$diff_accepts_a_option" = 'zyes' ; then |
| DIFF_A_OPTION=-a |
| fi |
| |
| # check whether diff should have --strip-trailing-cr (may be needed on MinGW) |
| diff_accepts_cr_option=no |
| if echo $host_os | grep mingw >/dev/null ; then |
| AC_MSG_CHECKING(whether diff accepts --strip-trailing-cr) |
| echo foo >conftest.dtx |
| echo foo | diff --strip-trailing-cr - conftest.dtx >/dev/null 2>&1 |
| error_status_diff_cr=$? |
| if test $error_status_diff_cr = 0; then |
| diff_accepts_cr_option=yes |
| fi |
| AC_MSG_RESULT($diff_accepts_cr_option) |
| rm -f conftest.dtx |
| fi |
| |
| DIFF_CR_OPTION= |
| if test "z$diff_accepts_cr_option" = 'zyes' ; then |
| DIFF_CR_OPTION='--strip-trailing-cr' |
| fi |
| |
| DIFF_OPTIONS="$DIFF_A_OPTION $DIFF_U_OPTION $DIFF_CR_OPTION" |
| AC_SUBST([DIFF_OPTIONS]) |
| ]) |
