69 lines
2.9 KiB
Plaintext
69 lines
2.9 KiB
Plaintext
# ===========================================================================
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# https://www.gnu.org/software/autoconf-archive/ax_prog_emacs.html
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# ===========================================================================
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#
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# SYNOPSIS
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#
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# AX_PROG_EMACS
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#
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# DESCRIPTION
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#
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# This macro allows the end user to specify a particular Emacs executable
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# via a configure script command-line arg. For example:
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#
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# ./configure EMACS=$HOME/build/GNU/emacs/src/emacs
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#
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# It also arranges to mention env var EMACS in the './configure --help'
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# output. See info node "(autoconf) Generic Programs" for details.
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#
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# More precisely...
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#
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# If env var EMACS is set, try to use its value directly, but avoid
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# getting fooled by value 't' (set by older Emacsen for subprocesses). If
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# no joy from the environment, search for "emacs" via AC_CHECK_PROG. If
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# still no joy, display "Emacs not found; required!" and make configure
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# exit failurefully. Otherwise, set shell var EMACS and AC_SUBST it, too.
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#
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# LICENSE
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#
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# Copyright (c) 2016-2017 Thien-Thi Nguyen
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#
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# This program is free software; you can redistribute it and/or modify it
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# under the terms of the GNU General Public License as published by the
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# Free Software Foundation; either version 3 of the License, or (at your
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# option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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# Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program. If not, see <https://www.gnu.org/licenses/>.
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#
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# As a special exception, the respective Autoconf Macro's copyright owner
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# gives unlimited permission to copy, distribute and modify the configure
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# scripts that are the output of Autoconf when processing the Macro. You
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# need not follow the terms of the GNU General Public License when using
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# or distributing such scripts, even though portions of the text of the
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# Macro appear in them. The GNU General Public License (GPL) does govern
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# all other use of the material that constitutes the Autoconf Macro.
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#
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# This special exception to the GPL applies to versions of the Autoconf
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# Macro released by the Autoconf Archive. When you make and distribute a
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# modified version of the Autoconf Macro, you may extend this special
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# exception to the GPL to apply to your modified version as well.
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#serial 2
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AC_DEFUN([AX_PROG_EMACS],[dnl
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AC_ARG_VAR([EMACS],[Use this Emacs to byte-compile the Emacs Lisp files.])
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dnl Allow env override but do not get fooled by 'EMACS=t'.
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test t = "$EMACS" && unset EMACS
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dnl The next line does nothing if var 'EMACS' is already set.
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AC_CHECK_PROG([EMACS], [emacs], [emacs])
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AS_IF([test "x$EMACS" = x],[AC_MSG_ERROR([Emacs not found; required!])])
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])dnl
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dnl ax_prog_emacs.m4 ends here
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