[bug#75807] [PATCH,WIP] Support for the Algol 68 language

[Jose E. Marchesi]

By the way, the version of autoconf needed to run the automake test can
be found in:

  https://git.sr.ht/~jemarch/a68-autoconf

Branch a68.


> Hello.
>
> New version of the patch below.  Differences from previous versions:
>
> - The GA68 variable has been renamed to A68.  (This has been also
>   changed in the corresponding autoconf patches.)
> - Added a section 'Algol 68 Support' to the manual.
> - Added a test t/a68-demo.sh.
>
> commit c33511e6df2b23de3040484a56cc0efdff5c0691
> Author: Jose E. Marchesi <jose.marchesi@oracle.com>
> Date:   Fri Jan 24 00:20:27 2025 +0100
>
>     Add support for the Algol 68 programming language.
>     
>     * NEWS: Add entry for Algol 68.
>     * doc/automake.texi (Algol 68 Support): New section.
>     * bin/automake.in: Call register_language for Algol 68.
>       (resolve_linker): handle A68LINK.
>       (%_am_macro_for_cond): Add entry for am__fastdepGA68.
>     * configure.ac: Look for ga68 and set GNU_GA68 and GNU_A68FLAGS if fuond.
>     * lib/Automake/Variable.pm (%_ac_macro_for_var): Add entries for GA68
>       and GA68FLAGS.
>     * t/a68-demo.sh: New test.
>
> diff --git a/NEWS b/NEWS
> index b4c50ffc6..9da978c39 100644
> --- a/NEWS
> +++ b/NEWS
> @@ -4,6 +4,10 @@ please see NEWS-future and start following the advice there 
> now.
>  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>  New in 1.x:
>  
> +* New supported languages:
> +
> +  - Support for Algol 68 has been added; based on the GNU Algol 68 compiler.
> +
>  * Miscellaneous changes
>  
>     - Only require the presence of an ABOUT-NLS file at the 'gnits'
> diff --git a/bin/automake.in b/bin/automake.in
> index 5d3e7c766..f7451e3f8 100644
> --- a/bin/automake.in
> +++ b/bin/automake.in
> @@ -1023,6 +1023,24 @@ register_language ('name' => 'java',
>                  'pure' => 1,
>                  'extensions' => ['.java', '.class', '.zip', '.jar']);
>  
> +# Algol 68 in GCC
> +register_language ('name' => 'a68',
> +                   'Name' => 'Algol 68',
> +                   'config_vars' => ['A68'],
> +                   'linker' => 'A68LINK',
> +                   'link' => '$(A68LD) $(AM_A68FLAGS) $(A68FLAGS) 
> $(AM_LDFLAGS) $(LDFLAGS) -o $@',
> +                'flags' => ['A68FLAGS'],
> +                'compile' => '$(A68) $(AM_A68FLAGS) $(A68FLAGS)',
> +                'ccer' => 'A68',
> +                'compiler' => 'A68COMPILE',
> +                'compile_flag' => '-c',
> +                'output_flag' => '-o',
> +                'libtool_tag' => 'A68',
> +                'lder' => 'A68LD',
> +                'ld' => '$(A68)',
> +                'pure' => 1,
> +                'extensions' => ['.a68']);
> +
>  ################################################################
>  
>  # Error reporting functions.
> @@ -5564,7 +5582,7 @@ EOF
>         if (0 == keys %libtool_tags)
>           {
>             # Hardcode the tags supported by Libtool 1.5.
> -           %libtool_tags = (CC => 1, CXX => 1, GCJ => 1, F77 => 1);
> +           %libtool_tags = (CC => 1, CXX => 1, GCJ => 1, F77 => 1, A68 => 1);
>           }
>       }
>      }
> @@ -6057,7 +6075,7 @@ sub resolve_linker
>  {
>      my (%linkers) = @_;
>  
> -    foreach my $l (qw(GCJLINK OBJCXXLINK CXXLINK F77LINK FCLINK OBJCLINK 
> UPCLINK))
> +    foreach my $l (qw(GCJLINK A68LINK OBJCXXLINK CXXLINK F77LINK FCLINK 
> OBJCLINK UPCLINK))
>      {
>       return $l if defined $linkers{$l};
>      }
> @@ -6176,11 +6194,12 @@ my %_am_macro_for_cond =
>    (
>    AMDEP => "one of the compiler tests\n"
>          . "    AC_PROG_CC, AC_PROG_CXX, AC_PROG_OBJC, AC_PROG_OBJCXX,\n"
> -        . "    AM_PROG_AS, AM_PROG_GCJ, AM_PROG_UPC",
> +        . "    AM_PROG_AS, AM_PROG_GCJ, AM_PROG_UPC, AM_PROG_A68",
>    am__fastdepCC => 'AC_PROG_CC',
>    am__fastdepCCAS => 'AM_PROG_AS',
>    am__fastdepCXX => 'AC_PROG_CXX',
>    am__fastdepGCJ => 'AM_PROG_GCJ',
> +  am__fastdepA68 => 'AM_PROG_A68',
>    am__fastdepOBJC => 'AC_PROG_OBJC',
>    am__fastdepOBJCXX => 'AC_PROG_OBJCXX',
>    am__fastdepUPC => 'AM_PROG_UPC'
> diff --git a/configure.ac b/configure.ac
> index 0a9e1904e..27fe4a328 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -565,6 +565,16 @@ if test "$GNU_F77" != false; then
>          _AM_SKIP_COMP_TESTS([GNU Fortran 77])])
>  fi
>  
> +# GNU Algol 68 compiler.
> +AC_ARG_VAR([GNU_A68],    [GNU Algol 68 compiler])
> +AC_ARG_VAR([GNU_A68FLAGS], [GNU Algol 68 compiler flags])
> +AC_CHECK_TOOLS([GNU_A68], [ga68], [false])
> +if test "$GNU_A68" != false; then
> +   AS_IF([AM_RUN_LOG([$GNU_A68 --version && $GNU_A68 -v])], [],
> +   [AC_MSG_WARN([botched installation for GNU Algol 68 compiler])
> +   _AM_SKIP_COMP_TESTS([GNU Algol 68])])
> +fi
> +
>  # GNU Java compiler.
>  AC_ARG_VAR([GNU_GCJ], [GNU Java compiler])
>  AC_ARG_VAR([GNU_GCJFLAGS], [GNU Java compiler flags])
> diff --git a/doc/automake.texi b/doc/automake.texi
> index a5b993007..4f848e7af 100644
> --- a/doc/automake.texi
> +++ b/doc/automake.texi
> @@ -230,6 +230,7 @@ Building Programs and Libraries
>  * Fortran 9x Support::          Compiling Fortran 9x sources
>  * Java Support with gcj::       Compiling Java sources using gcj
>  * Vala Support::                Compiling Vala sources
> +* Algol 68 Support::            Compiling Algol 68 sources
>  * Support for Other Languages:: Compiling other languages
>  * Dependencies::                Automatic dependency tracking
>  * EXEEXT::                      Support for executable extensions
> @@ -4848,6 +4849,7 @@ to build programs and libraries.
>  * Fortran 9x Support::          Compiling Fortran 9x sources
>  * Java Support with gcj::       Compiling Java sources using gcj
>  * Vala Support::                Compiling Vala sources
> +* Algol 68 Support::            Compiling Algol 68 sources
>  * Support for Other Languages::  Compiling other languages
>  * Dependencies::                Automatic dependency tracking
>  * EXEEXT::                      Support for executable extensions
> @@ -7178,6 +7180,41 @@ Note that currently, you cannot use per-target 
> @code{*_VALAFLAGS}
>  (@pxref{Renamed Objects}) to produce different C files from one Vala
>  source file.
>  
> +@node Algol 68 Support
> +@comment  node-name,  next,  previous,  up
> +@section Algol 68 Support
> +
> +@cindex Algol 68 support
> +@cindex Support for Algol 68
> +
> +Automake includes support for Algol 68, using GCC.
> +
> +Any package including Algol 68 code must define the output variable
> +@code{A68} in @file{configure.ac}; the simplest way to do this is to use
> +the @code{AC_PROG_A68} macro (@pxref{Particular Programs, , Particular
> +Program Checks, autoconf, The Autoconf Manual}).
> +
> +A few additional variables are defined when a Fortran 77 source file is
> +seen:
> +
> +@vtable @code
> +
> +@item A68
> +The name of the Algol 68 compiler.
> +
> +@item A68FLAGS
> +Any flags to pass to the Algol 68 compiler.
> +
> +@item AM_A68FLAGS
> +The maintainer's variant of @code{FFLAGS}.
> +
> +@item A68COMPILE
> +The command used to compile an Algol 68 source file.  The file name is
> +appended to form the complete command line.
> +
> +@item A68LINK
> +The command used to link a pure Algol 68 program or shared library.
> +@end vtable
>  
>  @node Support for Other Languages
>  @comment  node-name,  next,  previous,  up
> diff --git a/lib/Automake/Variable.pm b/lib/Automake/Variable.pm
> index 6e90b81f2..7608de23d 100644
> --- a/lib/Automake/Variable.pm
> +++ b/lib/Automake/Variable.pm
> @@ -183,6 +183,8 @@ my %_ac_macro_for_var =
>     CXX => 'AC_PROG_CXX',
>     CXXFLAGS => 'AC_PROG_CXX',
>     F77 => 'AC_PROG_F77',
> +   A68 => 'AC_PROG_A68',
> +   A68FLAGS => 'AC_PROG_A68',
>     FFLAGS => 'AC_PROG_F77',
>     FC => 'AC_PROG_FC',
>     FCFLAGS => 'AC_PROG_FC',
> diff --git a/t/a68-demo.sh b/t/a68-demo.sh
> new file mode 100644
> index 000000000..c2966d4ea
> --- /dev/null
> +++ b/t/a68-demo.sh
> @@ -0,0 +1,87 @@
> +#! /bin/sh
> +# Copyright (C) 2012-2025 Free Software Foundation, Inc.
> +#
> +# This program is free software; you can redistribute it and/or modify
> +# it under the terms of the GNU General Public License as published by
> +# the Free Software Foundation; either version 2, or (at your option)
> +# any later version.
> +#
> +# This program is distributed in the hope that it will be useful,
> +# but WITHOUT ANY WARRANTY; without even the implied warranty of
> +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> +# GNU General Public License for more details.
> +#
> +# You should have received a copy of the GNU General Public License
> +# along with this program.  If not, see <https://www.gnu.org/licenses/>.
> +
> +# Demo on Algol 68 support.
> +
> +required=ga68
> +am_create_testdir=empty
> +. test-init.sh
> +
> +cat > configure.ac << 'END'
> +AC_INIT([GNU Algol 68 Demo], [1.0], [bug-automake@gnu.org])
> +AC_CONFIG_SRCDIR([play.a68])
> +AC_CONFIG_AUX_DIR([build-aux])
> +AM_INIT_AUTOMAKE
> +AC_PROG_A68
> +AC_CONFIG_FILES([Makefile])
> +AC_OUTPUT
> +END
> +
> +cat > Makefile.am << 'END'
> +AUTOMAKE_OPTIONS = subdir-objects
> +
> +bin_PROGRAMS = work play
> +play_SOURCES = play.a68
> +work_SOURCES = work.a68
> +
> +.PHONY: test-objs
> +check-local: test-objs
> +test-objs:
> +     test -f play.$(OBJEXT)
> +     test -f work.$(OBJEXT)
> +END
> +
> +mkdir sub build-aux
> +
> +$ACLOCAL
> +$AUTOCONF
> +$AUTOMAKE --add-missing
> +
> +cat > work.a68 << 'END'
> +PROGRAM (puts ("We are working :-(\n"); 0)
> +END
> +
> +cat > play.a68 << 'END'
> +PROGRAM (puts ("We are playing :-)\n"); 0)
> +END
> +
> +./configure
> +$MAKE
> +$MAKE test-objs
> +
> +if ! cross_compiling; then
> +  unindent > exp.play << 'END'
> +    We are playing :-)
> +END
> +  unindent > exp.work << 'END'
> +    We are working :-(
> +END
> +  for p in play work; do
> +    # The program must run correctly (exit status = 0).
> +    ./$p
> +    # And it must have the expected output.  Note that we strip extra
> +    # CR characters (if any), to cater to MinGW programs on MSYS.
> +    # See automake bug#14493.
> +    ./$p | tr -d '\015' > got.$p || { cat got.$p; exit 1; }
> +    cat exp.$p
> +    cat got.$p
> +    diff exp.$p got.$p
> +  done
> +fi
> +
> +$MAKE distcheck
> +
> +: