#
# $Id$
#
-# Written by Keith Marshall <keithmarshall@users.sourceforge.net>
-# Copyright (C) 2009, 2010, MinGW Project
+# Written by Keith Marshall <keith@users.osdn.me>
+# Copyright (C) 2009, 2010, 2013, 2020, MinGW.org Project
#
#
# Configuration script for mingw-get
# MinGW Project, accept liability for any damages, however caused,
# arising from the use of this software.
#
- m4_include([m4/missing.m4])
+
+# build_aux_prefix
+# ----------------
+# Provides a mechanism for locating the build-aux file tree, (which
+# is expected to furnish supplementary M4 macro files), at configure
+# script generation time. This requires that the directory is named
+# "build-aux", but allows for its placement directly within the top
+# source directory, its immediate parent, or grandparent.
+#
+m4_define([build_aux_prefix],m4_esyscmd_s(dnl
+[for path in "" "../" "../../"
+ do test -x ${path}build-aux/config.guess && echo $path && exit
+ done
+]))
+
+# aux_include( macro_file_path_name )
+# Include a supplementary M4 macro file, assuming that it may be
+# found in the "build-aux/m4" directory within the prefix deduced
+# by the preceding "build_aux_prefix" macro.
+#
+m4_define([aux_include],[m4_include(build_aux_prefix[$1])])
+
+# Using the above, include the supplementary M4 macro files, which
+# are required by this package, at "configure" generation time.
+#
+aux_include([build-aux/m4/missing.m4])
+aux_include([build-aux/m4/makeopts.m4])
+
+
+# MINGW_AC_CONFIG_AUX_DIR( DIRNAME )
+# ----------------------------------
+# Emulate the "build-aux" location strategy of "build_aux_prefix",
+# but at configure script run time, in respect of the "build-aux"
+# directory named by DIRNAME; this allows for the possibility of
+# relocating the "build-aux" directory, relative to $top_srcdir,
+# after initial configure script generation.
+#
+# Note that this performs a similar function to AC_CONFIG_AUX_DIR,
+# but extends the search through the parent, and the grandparent, of
+# $srcdir, (in addition to $builddir, and $srcdir itself); although
+# this can be achieved with AC_CONFIG_AUX_DIR, it makes an unholy
+# mess of the resultant diagnostic message, in the event that the
+# DIRNAME search is unsuccessful.
+#
+# Also note that this implementation further extends the behaviour
+# of AC_CONFIG_AUX_DIR, by AC_SUBST assignment of the result of a
+# successful search, to the "buildauxdir" configuration variable.
+#
+AC_DEFUN([MINGW_AC_CONFIG_AUX_DIR],dnl
+[m4_n([ac_val=$1])MINGW_AC_CONFIG_AUX_DIRS([$1],[$ac_val])dnl
+ AC_SUBST([buildauxdir],[$ac_aux_dir])dnl
+])# MINGW_AC_CONFIG_AUX_DIR
+
+# MINGW_AC_CONFIG_AUX_DIRS( DIRNAME, UNQUOTED_DIRNAME )
+# -----------------------------------------------------
+# A wrapper around the undocumented AC_CONFIG_AUX_DIRS macro, (which
+# provides the actual implementation of AC_CONFIG_AUX_DIR); intended
+# to be invoked by MINGW_AC_CONFIG_AUX_DIR, this serves as a conduit
+# to AC_CONFIG_AUX_DIRS, passing both the verbatim DIRNAME argument,
+# and its $srcdir relative alternatives derived from UNQUOTED_DIRNAME,
+# stripped of one level of shell quoting, by assignment to the shell
+# variable $ac_val, then each wrapped in shell quotes, to achieve a
+# tidier presentation of the diagnostic message which will result
+# from failure of the AC_CONFIG_AUX_DIRS search.
+#
+AC_DEFUN([MINGW_AC_CONFIG_AUX_DIRS],dnl
+[AC_CONFIG_AUX_DIRS([$1 "$srcdir/$2" "$srcdir/../$2" "$srcdir/../../$2"])dnl
+])# MINGW_AC_CONFIG_AUX_DIRS
+
+# MINGW_AC_PACKAGE_DIST_URL( DOMAIN, PATH )
+# -----------------------------------------
+# Provides a mechanism for specifying the internet DOMAIN, and the
+# directory PATH relative to that DOMAIN, whence project packages are
+# to be offered for download. Precious variables PACKAGE_DIST_DOMAIN
+# and PACKAGE_DIST_DIR are assigned the default values as specified
+# for DOMAIN and PATH respectively; AC_SUBST is called for each.
+#
+AC_DEFUN([MINGW_AC_PACKAGE_DIST_URL],
+[: ${PACKAGE_DIST_DOMAIN="$1"} ${PACKAGE_DIST_DIR="$2"}dnl
+ AC_ARG_VAR([PACKAGE_DIST_DOMAIN],[Package download domain url [$1]])dnl
+ AC_ARG_VAR([PACKAGE_DIST_DIR],[Package download host directory [$2]])dnl
+])# MINGW_AC_PACKAGE_DIST_URL
+
+# MINGW_AC_OUTPUT
+# ---------------
+# A wrapper for AC_OUTPUT itself, to ensure that missing prerequisite
+# checks are completed, before the final output stage.
+#
+AC_DEFUN([MINGW_AC_OUTPUT],
+[AC_REQUIRE([_MINGW_AC_ABORT_IF_MISSING_PREREQ])dnl
+ AC_OUTPUT($@)dnl
+])# MINGW_AC_OUTPUT
+
+# MINGW_AC_PROG_LEX
+# -----------------
+# A wrapper for AC_PROG_LEX; it causes configure to abort, issuing a
+# missing lex diagnostic, when building from SCM sources, (as indicated
+# by absence of ${srcdir}/src/pkginfo/pkginfo.c), when no lex processor
+# appears to be available. Furthermore, if AC_PROG_LEX fails to assign
+# a sane value to LEX_OUTPUT_ROOT, this provides lex.yy as default.
+#
+AC_DEFUN([MINGW_AC_PROG_LEX],
+[AC_REQUIRE([AC_PROG_LEX])dnl
+ AS_IF([test x${LEX_OUTPUT_ROOT} = x],[LEX_OUTPUT_ROOT=lex.yy])
+ AS_IF([test x${LEX} != x:],,[test -f ${srcdir}/src/pkginfo/pkginfo.c],,
+ [MINGW_AC_ASSERT_MISSING([lex (or for preference, flex)],
+ [flex-2.5.35-2-msys-1.0.13-bin.tar.lzma (or equivalent)])dnl
+ ])dnl
+])# MINGW_AC_PROG_LEX
#
# $RCSfile$: end of file
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