Provide Autoconf syntax for NIST testsuite

Using this suite, it is possible to parallelize its evaluation
(for example with `autofonce run -t tests/cobol85/nist.at` with v0.5
or `autofonce run -t nist` with v0.6)

.autofonce

@@ -0,0 +1,46 @@
+[project]
+# name to use to infer config
+name = "gnucobol"
+
+# files used to locate the project top directory
+#   and to set the AUTOFONCE_SOURCE_DIR
+source_anchors = [ "tests/testsuite.at", "!" ]
+
+# files used to locate the project build directory
+#   where the _autofonce/ directory will be created
+#   and to set the AUTOFONCE_BUILD_DIR
+#   use "!" to trigger an error if build dir is mandatory
+build_anchors = [ "cobc/cobc", "!" ]
+
+[testsuites]
+# alias = "path-from-topdir"
+[testsuites.testsuite]
+file = "tests/testsuite.at"
+path = [ "tests/testsuite.src"]
+env = "testsuite"
+[testsuites.nist]
+file = "tests/cobol85/nist.at"
+path = [ "tests/cobol85/nistrun.src"]
+env = "testsuite"
+
+[envs]
+# env_name = """..."""
+# env_name = "<local-path-to-env-file"
+testsuite = """# look at 'build_anchors' to see how the build dir is detected among upper dirs
+
+abs_builddir=${AUTOFONCE_BUILD_DIR}/tests
+
+# these files are generated during configure or first `make check`
+
+. ${abs_builddir}/atconfig
+. ${abs_builddir}/atlocal
+
+# the following flags are needed for the NIST testsuite
+
+if test "x$AUTOFONCE_TESTSUITE" = "xnist"; then
+  export COB_DISABLE_WARNINGS=Y
+  export COB_SWITCH_1=ON
+  export COB_SWITCH_2=OFF
+fi
+"""
+

tests/cobol85/nist.at

@@ -0,0 +1,63 @@
+## Copyright (C) 2023 Free Software Foundation, Inc.
+## Written by Fabrice LE FESSANT
+##
+## This file is part of GnuCOBOL.
+##
+## The GnuCOBOL compiler 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 3 of the
+## License, or (at your option) any later version.
+##
+## GnuCOBOL 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 GnuCOBOL.  If not, see <https://www.gnu.org/licenses/>.
+
+AT_COPYRIGHT([Test cases from NIST])
+
+### GnuCOBOL Test Suite
+
+AT_INIT([GnuCOBOL NIST Tests])
+AT_COLOR_TESTS
+
+AT_TESTED([cobc cobcrun])
+
+## General tests of used binaries
+AT_BANNER([NC Tests])
+m4_include([run_NC.at])
+
+AT_BANNER([SM Tests])
+m4_include([run_SM.at])
+
+AT_BANNER([IC Tests])
+m4_include([run_IC.at])
+
+AT_BANNER([SQ Tests])
+m4_include([run_SQ.at])
+
+AT_BANNER([RL Tests])
+m4_include([run_RL.at])
+
+AT_BANNER([ST Tests])
+m4_include([run_ST.at])
+
+AT_BANNER([SG Tests])
+m4_include([run_SG.at])
+
+AT_BANNER([OB Tests])
+m4_include([run_OB.at])
+
+AT_BANNER([IF Tests])
+m4_include([run_IF.at])
+
+AT_BANNER([RW Tests])
+m4_include([run_RW.at])
+
+AT_BANNER([DB Tests])
+m4_include([run_DB.at])
+
+AT_BANNER([IX Tests])
+m4_include([run_IX.at])