Merge branch 'cleanup-license' into 'master'

Cleanup license See merge request !12

Merge branch 'cleanup-license' into 'master'
6a8f2ff0 · Luis Kornblueh · e9ce17ad · 9d64372b · 6a8f2ff0 · 6a8f2ff0
Commit 6a8f2ff0 authored 1 year ago by Luis Kornblueh
--- a/include/mtime_timedelta.h
+++ b/include/mtime_timedelta.h
+// Copyright (c) 2013-2024 MPI-M, Luis Kornblueh, Rahul Sinha and DWD, Florian Prill. All rights reserved.
+//
+// SPDX-License-Identifier: BSD-3-Clause
+//
 /**
 * @addtogroup CBindings libmtime C language bindings
 * @{

--- a/include/mtime_utilities.h
+++ b/include/mtime_utilities.h
+// Copyright (c) 2013-2024 MPI-M, Luis Kornblueh, Rahul Sinha and DWD, Florian Prill. All rights reserved.
+//
+// SPDX-License-Identifier: BSD-3-Clause
+//
 /**
 * @addtogroup CBindings libmtime C language bindings
 * @{

--- a/include/orbit.h
+++ b/include/orbit.h
+// Copyright (c) 2013-2024 MPI-M, Luis Kornblueh, Rahul Sinha and DWD, Florian Prill. All rights reserved.
+//
+// SPDX-License-Identifier: BSD-3-Clause
+//
 #ifndef ORBIT_H
 #define ORBIT_H


--- a/m4/acx_fc_module.m4
+++ b/m4/acx_fc_module.m4
+# Copyright (c) 2018-2024, MPI-M
+#
+# Author: Sergey Kosukhin <sergey.kosukhin@mpimet.mpg.de>
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+# 1. Redistributions of source code must retain the above copyright notice,
+#    this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in the
+#    documentation and/or other materials provided with the distribution.
+# 3. Neither the name of the copyright holder nor the names of its
+#    contributors may be used to endorse or promote products derived from
+#    this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+
 # ACX_FC_MODULE_IN_FLAG([ACTION-IF-SUCCESS],
 #                       [ACTION-IF-FAILURE = FAILURE])
 # -----------------------------------------------------------------------------
-# Originally taken from the master branch of Autoconf where it is known as
-# AC_FC_MODULE_FLAG.
-# -----------------------------------------------------------------------------
 # Finds the Fortran compiler flag needed to specify module search paths.
 #
 # If successful, runs ACTION-IF-SUCCESS, otherwise runs ACTION-IF-FAILURE
@@ -12,59 +39,36 @@
 # The flag is cached in the acx_cv_fc_module_in_flag variable, which may
 # contain a significant trailing whitespace.
 #
-# Known flags:
-# gfortran: -Idir, -I dir (-M dir, -Mdir (deprecated),
-#                          -Jdir for writing)
-# g95: -I dir (-fmod=dir for writing)
-# SUN: -Mdir, -M dir (-moddir=dir for writing;
-#                     -Idir for includes is also searched)
-# HP: -Idir, -I dir (+moddir=dir for writing)
-# IBM: -Idir (-qmoddir=dir for writing)
-# Intel: -Idir -I dir (-mod dir for writing)
-# Absoft: -pdir
-# Lahey: -mod dir
-# Cray: -module dir, -p dir (-J dir for writing)
-#       -e m is needed to enable writing .mod files at all
-# Compaq: -Idir
-# NAGWare: -I dir
-# PathScale: -I dir  (but -module dir is looked at first)
-# Portland: -module dir (first -module also names dir for writing)
-# Fujitsu: -Am -Idir (-Mdir for writing is searched first, then '.',
-#                     then -I)
-#                    (-Am indicates how module information is saved)
+# The implementation patches the standard Autoconf macro AC_FC_MODULE_FLAG to
+# reduce the number of LANG switches and to avoid false negative results with
+# the GFortran '-fmodule-private' flag.
 #
 AC_DEFUN([ACX_FC_MODULE_IN_FLAG],
  [AC_LANG_ASSERT([Fortran])dnl
-   AC_CACHE_CHECK([for Fortran compiler flag needed to specify search paths dnl
-for module files],
-     [acx_cv_fc_module_in_flag],
-     [acx_cv_fc_module_in_flag=unknown
-      AS_MKDIR_P([conftest.dir])
-      cd conftest.dir
-      AC_COMPILE_IFELSE([AC_LANG_SOURCE(
-[[      module conftest_module
-      implicit none
-      public
-      contains
-      subroutine conftest_routine
-      end subroutine
-      end module]])],
-        [cd ..
-         acx_save_FCFLAGS=$FCFLAGS
-         AC_LANG_CONFTEST([AC_LANG_PROGRAM([],
-[[      use conftest_module, only : conftest_routine
+   m4_pushdef([ac_cv_fc_module_flag], [acx_cv_fc_module_in_flag])dnl
+   m4_pushdef([AC_CACHE_CHECK],
+     m4_bpatsubst(m4_dquote(m4_defn([AC_CACHE_CHECK])),
+       [\$][1],
+       [for Fortran compiler flag needed to specify search paths for module dnl
+files]))dnl
+   m4_pushdef([AC_SUBST], [dn][l ])dnl
+   m4_pushdef([AC_CONFIG_COMMANDS_PRE], [dn][l ])dnl
+   m4_pushdef([acx_orig_macro],
+     m4_bpatsubsts(m4_dquote(m4_defn([AC_FC_MODULE_FLAG])),
+       [^      module conftest_module], [\&
      implicit none
-      call conftest_routine()]])])
-         for acx_flag in -M -I '-I ' '-M ' -p '-mod ' '-module ' '-Am -I'; do
-           FCFLAGS="$acx_save_FCFLAGS ${acx_flag}conftest.dir dnl
-dnl Add the flag twice to prevent matching an output flag.
-${acx_flag}conftest.dir"
-           AC_COMPILE_IFELSE([], [acx_cv_fc_module_in_flag=$acx_flag])
-           test "x$acx_cv_fc_module_in_flag" != xunknown && break
-         done
-         rm -f conftest.$ac_ext
-         FCFLAGS=$acx_save_FCFLAGS])
-      rm -rf conftest.dir])
+      public],
+       [^      use conftest_module], [\&, only : conftest_routine
+      implicit none],
+       [AC_LANG_P\(OP\|USH\)(\[?Fortran\]?)], [dn][l ],
+       [FC_MODINC=.*], [dn][l ],
+       [^ *#], [dn][l ]))dnl
+   acx_orig_macro([:], [:])dnl
+   m4_popdef([acx_orig_macro])dnl
+   m4_popdef([AC_SUBST])dnl
+   m4_popdef([AC_CONFIG_COMMANDS_PRE])dnl
+   m4_popdef([AC_CACHE_CHECK])dnl
+   m4_popdef([ac_cv_fc_module_flag])dnl
   AS_VAR_IF([acx_cv_fc_module_in_flag], [unknown], [m4_default([$2],
     [AC_MSG_FAILURE([unable to detect Fortran compiler flag needed to dnl
 specify search paths for module files])])], [$1])])
@@ -72,9 +76,6 @@ specify search paths for module files])])], [$1])])
 # ACX_FC_MODULE_OUT_FLAG([ACTION-IF-SUCCESS],
 #                        [ACTION-IF-FAILURE = FAILURE])
 # -----------------------------------------------------------------------------
-# Originally taken from the master branch of Autoconf where it is known as
-# AC_FC_MODULE_OUTPUT_FLAG.
-# -----------------------------------------------------------------------------
 # Finds the Fortran compiler flag needed to specify module output path.
 #
 # If successful, runs ACTION-IF-SUCCESS, otherwise runs ACTION-IF-FAILURE
@@ -83,42 +84,40 @@ specify search paths for module files])])], [$1])])
 # The flag is cached in the acx_cv_fc_module_out_flag variable, which may
 # contain a significant trailing whitespace.
 #
-# See ACX_FC_MODULE_IN_FLAG for the known flags.
+# The implementation patches the standard Autoconf macro
+# AC_FC_MODULE_OUTPUT_FLAG to reduce the number of LANG switches and to avoid
+# false negative results with the GFortran '-fmodule-private' flag.
 #
 AC_DEFUN([ACX_FC_MODULE_OUT_FLAG],
  [AC_LANG_ASSERT([Fortran])dnl
-   AC_CACHE_CHECK([for Fortran compiler flag needed to specify output path dnl
-for module files],
-     [acx_cv_fc_module_out_flag],
-     [acx_cv_fc_module_out_flag=unknown
-      AS_MKDIR_P([conftest.dir/sub])
-      cd conftest.dir
-      acx_save_FCFLAGS=$FCFLAGS
-      AC_LANG_CONFTEST([AC_LANG_PROGRAM([],
-[[      use conftest_module, only : conftest_routine
-      implicit none
-      call conftest_routine()]])])
-      mv conftest.$ac_ext sub/conftest.$ac_ext
-      AC_LANG_CONFTEST([AC_LANG_SOURCE(
-[[      module conftest_module
+   m4_pushdef([ac_cv_fc_module_output_flag], [acx_cv_fc_module_out_flag])dnl
+   m4_pushdef([AC_CACHE_CHECK],
+     m4_bpatsubst(m4_dquote(m4_defn([AC_CACHE_CHECK])),
+       [\$][1],
+       [for Fortran compiler flag needed to specify output path for module dnl
+files]))dnl
+   m4_pushdef([AC_SUBST], [dn][l ])dnl
+   m4_pushdef([AC_CONFIG_COMMANDS_PRE], [dn][l ])dnl
+   m4_pushdef([acx_orig_macro],
+     m4_bpatsubsts(m4_dquote(m4_defn([AC_FC_MODULE_OUTPUT_FLAG])),
+       [^      module conftest_module], [\&
      implicit none
-      public
-      contains
-      subroutine conftest_routine
-      end subroutine
-      end module]])])
-      for acx_flag in -J '-J ' -fmod= -moddir= +moddir= -qmoddir= '-mdir ' dnl
-'-mod ' '-module ' -M '-Am -M' '-e m -J '; do
-        FCFLAGS="${acx_flag}sub $acx_save_FCFLAGS"
-        AC_COMPILE_IFELSE([],
-          [cd sub
-           AC_COMPILE_IFELSE([], [acx_cv_fc_module_out_flag=$acx_flag])
-           cd ..])
-        test "x$acx_cv_fc_module_out_flag" != xunknown && break
-      done
-      FCFLAGS=$acx_save_FCFLAGS
-      cd ..
-      rm -rf conftest.dir])
+      public],
+       [^      use conftest_module], [\&, only : conftest_routine
+      implicit none],
+       [AC_LANG_P\(OP\|USH\)(\[?Fortran\]?)], [dn][l ],
+       [FC_MODOUT=.*], [dn][l ],
+       [^ *#], [dn][l ]))dnl
+   m4_version_prereq([2.70], [],
+     [m4_define([acx_orig_macro],
+        m4_bpatsubsts(m4_dquote(m4_defn([acx_orig_macro])),
+          ['-mod '], ['-mdir ' \&],))])dnl
+   acx_orig_macro([:], [:])dnl
+   m4_popdef([acx_orig_macro])dnl
+   m4_popdef([AC_SUBST])dnl
+   m4_popdef([AC_CONFIG_COMMANDS_PRE])dnl
+   m4_popdef([AC_CACHE_CHECK])dnl
+   m4_popdef([ac_cv_fc_module_output_flag])dnl
   AS_VAR_IF([acx_cv_fc_module_out_flag], [unknown], [m4_default([$2],
     [AC_MSG_FAILURE([unable to detect Fortran compiler flag needed to dnl
 specify output path for module files])])], [$1])])
@@ -126,9 +125,6 @@ specify output path for module files])])], [$1])])
 # ACX_FC_MODULE_NAMING([ACTION-IF-SUCCESS],
 #                      [ACTION-IF-FAILURE = FAILURE])
 # -----------------------------------------------------------------------------
-# Originally taken from the master branch of Autoconf where it is known as
-# AC_FC_MODULE_EXTENSION.
-# -----------------------------------------------------------------------------
 # Finds the Fortran compiler module file naming template.
 #
 # If successful, runs ACTION-IF-SUCCESS, otherwise runs ACTION-IF-FAILURE
@@ -157,20 +153,35 @@ AS_VAR_TEST_SET([acx_cv_fc_module_naming_ext])],
      subroutine conftest_routine
      end subroutine
      end module]])],
-        [acx_cv_fc_module_naming_ext=`ls | sed -n 's,conftest_module\.,,p'`
-         AS_VAR_IF([acx_cv_fc_module_naming_ext], [],
-           [acx_cv_fc_module_naming_ext=`ls | sed -n 's,CONFTEST_MODULE\.,,p'`
-            AS_VAR_IF([acx_cv_fc_module_naming_ext], [],
-              [acx_cv_fc_module_naming_ext=unknown
+        [AS_CASE(["$acx_cv_fc_module_naming_upper"],
+           [yes],
+           [acx_tmp='CONFTEST_MODULE.*'
+            acx_cv_fc_module_naming_ext=unknown],
+           [no],
+           [acx_tmp='conftest_module.*'
+            acx_cv_fc_module_naming_ext=unknown],
+           [AS_VAR_SET_IF([acx_cv_fc_module_naming_ext],
+              [acx_tmp="CONFTEST_MODULE.$acx_cv_fc_module_naming_ext dnl
+conftest_module.$acx_cv_fc_module_naming_ext"
               acx_cv_fc_module_naming_upper=unknown],
-              [acx_cv_fc_module_naming_upper=yes])],
-           [acx_cv_fc_module_naming_upper=no])],
-        [acx_cv_fc_module_naming_ext=unknown
-         acx_cv_fc_module_naming_upper=unknown])
+              [acx_tmp='CONFTEST_MODULE.* conftest_module.*'
+               acx_cv_fc_module_naming_upper=unknown
+               acx_cv_fc_module_naming_ext=unknown])])
+         acx_tmp=`ls $acx_tmp 2>/dev/null`
+         AS_IF([test 1 -eq `AS_ECHO(["$acx_tmp"]) | wc -l` 2>/dev/null],
+           [AS_CASE(["$acx_tmp"],
+              [CONFTEST_MODULE.*],
+              [acx_cv_fc_module_naming_upper=yes
+               acx_cv_fc_module_naming_ext=`echo $acx_tmp | dnl
+sed -n 's,CONFTEST_MODULE\.,,p'`],
+              [conftest_module.*],
+              [acx_cv_fc_module_naming_upper=no
+               acx_cv_fc_module_naming_ext=`echo $acx_tmp | dnl
+sed -n 's,conftest_module\.,,p'`])])])
      cd ..
      rm -rf conftest.dir])
-   AS_IF([test x"$acx_cv_fc_module_naming_upper" = xunknown || dnl
-test x"$acx_cv_fc_module_naming_ext" = xunknown],
+   AS_IF([test "x$acx_cv_fc_module_naming_upper" = xunknown || dnl
+test "x$acx_cv_fc_module_naming_ext" = xunknown],
     [AC_MSG_RESULT([unknown])
      m4_default([$2], [AC_MSG_FAILURE([unable to detect Fortran compiler dnl
 module file naming template])])],

--- a/m4/acx_fc_pp.m4
+++ b/m4/acx_fc_pp.m4
+# Copyright (c) 2018-2024, MPI-M
+#
+# Author: Sergey Kosukhin <sergey.kosukhin@mpimet.mpg.de>
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+# 1. Redistributions of source code must retain the above copyright notice,
+#    this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in the
+#    documentation and/or other materials provided with the distribution.
+# 3. Neither the name of the copyright holder nor the names of its
+#    contributors may be used to endorse or promote products derived from
+#    this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+
 # ACX_FC_PP_SRCEXT(EXTENSION,
 #                  [ACTION-IF-SUCCESS],
 #                  [ACTION-IF-FAILURE = FAILURE])
 # -----------------------------------------------------------------------------
-# Originally taken from the master branch of Autoconf where it is known as
-# AC_FC_PP_SRCEXT.
-# -----------------------------------------------------------------------------
 # Finds the Fortran compiler flag needed to enable Fortran preprocessing for
 # source files with extension EXTENSION. The result is either "unknown",
 # or the actual compiler flag required to enable Fortran preprocessing, which
@@ -21,69 +48,35 @@
 # The flag is cached in the acx_cv_fc_pp_srcext_[]EXTENSION, which may contain
 # whitespaces.
 #
-# Known flags:
-# gfortran: -cpp
-# SGI: -ftpp
-# SUN: -xpp={fpp,cpp}
-# IBM: -qsuffix=cpp=EXTENSION
-# HP: +cpp
-# PGI: -Mpreprocess
-# Absoft: -cpp
-# Cray: -e T, -e Z
-# Intel: -fpp (-Tf may also be needed right before the source file name)
-# PathScale: -ftpp, -cpp
-# Lahey: -Cpp
-# NAGWare: -fpp
-# Compaq/Tru64: -cpp
-# f2c: -cpp
-# g95: -cpp
+# The implementation patches the standard Autoconf macro AC_FC_PP_SRCEXT to
+# reduce the number of LANG switches and to support additional known compiler
+# flags:
+# Cray: -e T (must precede -e Z, which triggers generation of unwanted *.i
+#             flags and crashes old versions of the compiler at the linking
+#             stage)
 #
 AC_DEFUN([ACX_FC_PP_SRCEXT],
-  [m4_provide([AC_FC_PP_SRCEXT])dnl
-   AC_LANG_ASSERT([Fortran])dnl
+  [AC_LANG_ASSERT([Fortran])dnl
+   acx_ext_save=$ac_ext
   m4_pushdef([acx_cache_var], [acx_cv_fc_pp_srcext_$1])dnl
-   AC_MSG_CHECKING([for Fortran compiler flag needed to compile dnl
-preprocessed .$1 files])
-   AC_CACHE_VAL([acx_cache_var],
-     [acx_cache_var=unknown
-      acx_ext_save=$ac_ext
-      acx_fcflags_srcext_save=$ac_fcflags_srcext
-      ac_ext=$1
-      AS_CASE([$acx_fc_pp_srcext_ext],
-        [[[fF]]77], [acx_fc_pp_srcext_try=f77-cpp-input],
-        [acx_fc_pp_srcext_try=f95-cpp-input])
-      for ac_fcflags_srcext in '' -ftpp -fpp -Tf '-fpp -Tf' -xpp=fpp dnl
-Mpreprocess '-e T' '-e Z' -cpp -xpp=cpp -qsuffix=cpp=$1 dnl
-"-x $acx_fc_pp_srcext_try" +cpp -Cpp; do
-        AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],
-[[#if 0
-#include <ac_nonexistent.h>
-      choke me
-#endif]])],
-          [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],
-[[#if 1
-#include <ac_nonexistent.h>
-      choke me
-#endif]])],
-             [],
-             [acx_cache_var=$ac_fcflags_srcext])])
-        test "x$acx_cache_var" != xunknown && break
-      done
-      ac_fcflags_srcext=$acx_fcflags_srcext_save
-      ac_ext=$acx_ext_save])
-   AS_IF([test -n "$acx_cache_var"],
-     [AC_MSG_RESULT([$acx_cache_var])],
-     [AC_MSG_RESULT([none needed])])
-   AC_SUBST([FCFLAGS_][$1])
+   m4_pushdef([ac_cv_fc_pp_srcext_$1], [acx_cache_var])dnl
+   m4_pushdef([AC_CACHE_CHECK],
+     m4_bpatsubst(m4_dquote(m4_defn([AC_CACHE_CHECK])),
+       [\$][1],
+       [for Fortran compiler flag needed to compile preprocessed .$1 files]))dnl
+   m4_pushdef([AC_FC_PP_SRCEXT],
+     m4_bpatsubsts(m4_dquote(m4_defn([AC_FC_PP_SRCEXT])),
+       ["-e Z"], ["-e T" \&],
+       [AC_LANG_P\(OP\|USH\)(\[?Fortran\]?)], [dn][l ]))dnl
+   AC_FC_PP_SRCEXT([$1], [], [:])
+   m4_popdef([AC_FC_PP_SRCEXT])dnl
+   m4_popdef([AC_CACHE_CHECK])dnl
+   m4_popdef([ac_cv_fc_pp_srcext_$1])dnl
   AS_VAR_IF([acx_cache_var], [unknown],
-     [ac_fcflags_srcext=
-      AS_VAR_COPY([FCFLAGS_][$1], [ac_fcflags_srcext])
+     [ac_ext=$acx_ext_save
      m4_default([$3],
        [AC_MSG_FAILURE([unable to detect Fortran compiler flag needed to dnl
 compile preprocessed .$1 files])])],
-     [ac_fcflags_srcext=$acx_cache_var
-      AS_VAR_COPY([FCFLAGS_][$1], [ac_fcflags_srcext])
-      ac_fc_srcext=$1
-      AS_VAR_COPY([ac_ext], [ac_fc_srcext])
+     [ac_ext=$ac_fc_srcext
      $2])
   m4_popdef([acx_cache_var])])
--- a/m4/acx_lang_lib.m4
+++ b/m4/acx_lang_lib.m4
+# Copyright (c) 2010-2024, DKRZ, MPI-M
+#
+# Authors:
+#   Thomas Jahns <jahns@dkrz.de>
+#   Sergey Kosukhin <sergey.kosukhin@mpimet.mpg.de>
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+# 1. Redistributions of source code must retain the above copyright notice,
+#    this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in the
+#    documentation and/or other materials provided with the distribution.
+# 3. Neither the name of the copyright holder nor the names of its
+#    contributors may be used to endorse or promote products derived from
+#    this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+
 # ACX_LANG_LIB_CHECK(FUNC-NAME,
 #                    [ACTION-IF-SUCCESS],
 #                    [ACTION-IF-FAILURE = FAILURE],

--- a/m4/acx_lang_openmp.m4
+++ b/m4/acx_lang_openmp.m4
+# Copyright (c) 2018-2024, MPI-M
+#
+# Author: Sergey Kosukhin <sergey.kosukhin@mpimet.mpg.de>
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+# 1. Redistributions of source code must retain the above copyright notice,
+#    this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in the
+#    documentation and/or other materials provided with the distribution.
+# 3. Neither the name of the copyright holder nor the names of its
+#    contributors may be used to endorse or promote products derived from
+#    this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+
 # ACX_LANG_OPENMP_FLAG([ACTION-IF-SUCCESS],
 #                      [ACTION-IF-FAILURE = FAILURE])
 # -----------------------------------------------------------------------------
-# Originally taken from the master branch of Autoconf where it is a part of
-# AC_OPENMP.
-# -----------------------------------------------------------------------------
 # Finds the compiler flag needed to enable OpenMP support. The result is either
 # "unknown", or the actual compiler flag required to enable OpenMP support,
 # which may be an empty string.
 #
-# Known flags:
-# Intel >= 16: -qopenmp
-# NAG, Intel < 16: -openmp
-# GNU: -fopenmp
-# Cray: -homp
-# SGI, PGI: -mp
-# SunPRO: -xopenmp
-# Tru64 Compaq C: -omp
-# IBM XL: -qsmp=omp
-# NEC SX: -Popenmp
-# Lahey Fortran: --openmp
-#
 # If successful, runs ACTION-IF-SUCCESS, otherwise runs ACTION-IF-FAILURE
 # (defaults to failing with an error message).
 #
@@ -34,7 +49,9 @@
 # acx_cv_[]_AC_LANG_ABBREV[]_macro__OPENMP_value shell variable. The possible
 # (successful) values of the variable are dates, which map to the versions of
 # the standard in the following way:
-#   201611 5.0 (OpenMP 5.0 preview 1)
+#   202111 5.2
+#   202011 5.1
+#   201811 5.0
 #   201511 4.5
 #   201307 4.0
 #   201107 3.1
@@ -54,8 +71,7 @@ support])
     [acx_cache_var=unknown
      acx_save_[]_AC_LANG_PREFIX[]FLAGS=$[]_AC_LANG_PREFIX[]FLAGS
      AC_LANG_CONFTEST([_ACX_LANG_OPENMP])
-      for acx_lang_openmp_flag in '' -qopenmp -openmp -fopenmp -homp -mp dnl
-xopenmp -omp -qsmp=omp -Popenmp --openmp; do
+      for acx_lang_openmp_flag in '' -qopenmp -openmp -fopenmp -homp -mp; do
        _AC_LANG_PREFIX[]FLAGS="${acx_save_[]_AC_LANG_PREFIX[]FLAGS} dnl
 $acx_lang_openmp_flag"
        AC_LINK_IFELSE([], [acx_cache_var=$acx_lang_openmp_flag])

--- a/m4/acx_lang_package.m4
+++ b/m4/acx_lang_package.m4
+# Copyright (c) 2010-2024, DKRZ, MPI-M
+#
+# Authors:
+#   Thomas Jahns <jahns@dkrz.de>
+#   Sergey Kosukhin <sergey.kosukhin@mpimet.mpg.de>
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+# 1. Redistributions of source code must retain the above copyright notice,
+#    this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in the
+#    documentation and/or other materials provided with the distribution.
+# 3. Neither the name of the copyright holder nor the names of its
+#    contributors may be used to endorse or promote products derived from
+#    this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+
 # ACX_LANG_PACKAGE_INIT(PACKAGE-NAME,
 #                       [INC-SEARCH-FLAGS],
 #                       [LIB-SEARCH-FLAGS],
@@ -36,13 +68,13 @@ AC_DEFUN([ACX_LANG_PACKAGE_INIT],
   m4_pushdef([acx_package_with_root],
     [with_[]AS_TR_SH([ASX_TR_ARG([$1])])_root])dnl
   AC_ARG_WITH(ASX_TR_ARG([$1])[-root],
-     [AC_HELP_STRING([--with-ASX_TR_ARG([$1])-root=[]acx_package_ROOT],
+     [AS_HELP_STRING([--with-ASX_TR_ARG([$1])-root=[]acx_package_ROOT],
        [root search path for $1 headers and libraries])])
   m4_ifnblank([$2],
     [m4_pushdef([acx_package_with_include],
        [with_[]AS_TR_SH([ASX_TR_ARG([$1])])_include])dnl
      AC_ARG_WITH(ASX_TR_ARG([$1])[-include],
-        [AC_HELP_STRING([--with-ASX_TR_ARG([$1])-include=DIR],
+        [AS_HELP_STRING([--with-ASX_TR_ARG([$1])-include=DIR],
           [search path for $1 headers @<:@]acx_package_ROOT[]dnl
 m4_default([$4], [/include])[@:>@])], [],
           [AS_VAR_SET_IF([acx_package_with_root],
@@ -61,7 +93,7 @@ m4_default([$4], [/include])"])])
     [m4_pushdef([acx_package_with_lib],
        [with_[]AS_TR_SH([ASX_TR_ARG([$1])])_lib])dnl
      AC_ARG_WITH(ASX_TR_ARG([$1])[-lib],
-        [AC_HELP_STRING([--with-ASX_TR_ARG([$1])-lib=DIR],
+        [AS_HELP_STRING([--with-ASX_TR_ARG([$1])-lib=DIR],
           [search path for $1 libraries @<:@]acx_package_ROOT[]dnl
 m4_default([$5], [/lib])[@:>@])],
           [],

--- a/m4/asx_common.m4
+++ b/m4/asx_common.m4
+# Copyright (c) 2018-2024, MPI-M
+#
+# Author: Sergey Kosukhin <sergey.kosukhin@mpimet.mpg.de>
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+# 1. Redistributions of source code must retain the above copyright notice,
+#    this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in the
+#    documentation and/or other materials provided with the distribution.
+# 3. Neither the name of the copyright holder nor the names of its
+#    contributors may be used to endorse or promote products derived from
+#    this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+
 # ASX_TR_ARG(EXPRESSION)
 # -----------------------------------------------------------------------------
 # Transforms EXPRESSION into shell code that generates a name for a command
@@ -74,3 +104,34 @@ AC_DEFUN([ASX_ESCAPE_SINGLE_QUOTE],
  [AS_CASE([AS_VAR_GET([$1])], [*\'*],
     [AS_VAR_SET([$1], [`AS_ECHO(["AS_VAR_GET([$1])"]) | dnl
 sed "s/'/'\\\\\\\\''/g"`])])])
+
+# ASX_SRCDIRS(BUILD-DIR-NAME)
+# -----------------------------------------------------------------------------
+# Receives a normalized (i.e. does not contain '/./', '..', etc.) path
+# BUILD-DIR-NAME to a directory relative to the top build directory and emits
+# shell code that sets the following variables:
+#     1) ac_builddir - path to BUILD-DIR-NAME relative to BUILD-DIR-NAME
+#                      (i.e. always equals to '.');
+#     2) ac_abs_builddir - absolute path to BUILD-DIR-NAME;
+#     3) ac_top_builddir_sub - path to the top build directory relative to
+#                              BUILD-DIR-NAME (i.e. equals to '.' if
+#                              BUILD-DIR-NAME is the top build directory);
+#     4) ac_top_build_prefix - empty if ac_top_builddir_sub equals to '.' and
+#                              path to the top build directory relative to
+#                              BUILD-DIR-NAME with a trailing slash, otherwise;
+#     5) ac_abs_top_builddir - absolute path to the top build directory;
+#     6) ac_srcdir - path to <top-srcdir>/BUILD-DIR-NAME relative to
+#                    BUILD-DIR-NAME where <top-srcdir> is the top source
+#                    directory (i.e. equals to the path from BUILD-DIR-NAME to
+#                    its respective source directory);
+#     7) ac_abs_srcdir - absolute path to <top-srcdir>/BUILD-DIR-NAME where
+#                        <top-srcdir> is the top source directory (i.e. equals
+#                        to the absolute path to the source directory that
+#                        corresponds to BUILD-DIR-NAME);
+#     8) ac_top_srcdir - path to the top source directory relative to
+#                        BUILD-DIR-NAME;
+#     9) ac_abs_top_srcdir - absolute path to the top source directory.
+#
+AC_DEFUN([ASX_SRCDIRS],
+  [AC_REQUIRE_SHELL_FN([acx_subdir_srcdirs_fn], [], [_AC_SRCDIRS(["$[]1"])])dnl
+   acx_subdir_srcdirs_fn $1])
\ No newline at end of file
--- a/m4/ax_prog_doxygen.m4
+++ b/m4/ax_prog_doxygen.m4
@@ -88,6 +88,7 @@
 #   Then add this variable to MOSTLYCLEANFILES.
 #
 # LICENSE
+#   SPDX-License-Identifier: FSFAP
 #
 #   Copyright (c) 2009 Oren Ben-Kiki <oren@ben-kiki.org>
 #   Copyright (c) 2015 Olaf Mandel <olaf@mandel.name>

--- a/m4/ltoptions.m4
+++ b/m4/ltoptions.m4
 # Helper functions for option handling.                    -*- Autoconf -*-
 #
-#   Copyright (C) 2004-2005, 2007-2009, 2011-2015 Free Software
-#   Foundation, Inc.
+#   Copyright (C) 2004-2005, 2007-2009, 2011-2019, 2021-2022 Free
+#   Software Foundation, Inc.
 #   Written by Gary V. Vaughan, 2004
 #
 # This file is free software; the Free Software Foundation gives

--- a/m4/ltsugar.m4
+++ b/m4/ltsugar.m4
 # ltsugar.m4 -- libtool m4 base layer.                         -*-Autoconf-*-
 #
-# Copyright (C) 2004-2005, 2007-2008, 2011-2015 Free Software
+# Copyright (C) 2004-2005, 2007-2008, 2011-2019, 2021-2022 Free Software
 # Foundation, Inc.
 # Written by Gary V. Vaughan, 2004
 #

--- a/m4/lt~obsolete.m4
+++ b/m4/lt~obsolete.m4
 # lt~obsolete.m4 -- aclocal satisfying obsolete definitions.    -*-Autoconf-*-
 #
-#   Copyright (C) 2004-2005, 2007, 2009, 2011-2015 Free Software
-#   Foundation, Inc.
+#   Copyright (C) 2004-2005, 2007, 2009, 2011-2019, 2021-2022 Free
+#   Software Foundation, Inc.
 #   Written by Scott James Remnant, 2004.
 #
 # This file is free software; the Free Software Foundation gives

--- a/pfunit/.gitignore
+++ b/pfunit/.gitignore
+# Copyright (c) 2013-2024 MPI-M, Luis Kornblueh, Rahul Sinha and DWD, Florian Prill. All rights reserved.
+#
+# SPDX-License-Identifier: CC0-1.0
+#
+
 /tests
--- a/pfunit/tests/testSuites.inc
+++ b/pfunit/tests/testSuites.inc
+!! Copyright (c) 2013-2024 MPI-M, Luis Kornblueh, Rahul Sinha and DWD, Florian Prill. All rights reserved.
+!!
+!! SPDX-License-Identifier: BSD-3-Clause
+!!
 ADD_TEST_SUITE(from_example_test_suite)
--- a/src/Makefile.am
+++ b/src/Makefile.am
+# Copyright (c) 2013-2024 MPI-M, Luis Kornblueh, Rahul Sinha and DWD, Florian Prill. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
 lib_LTLIBRARIES = libmtime.la

 AM_CPPFLAGS = -I$(top_srcdir)/include

--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -426,6 +426,11 @@ target_alias = @target_alias@
 top_build_prefix = @top_build_prefix@
 top_builddir = @top_builddir@
 top_srcdir = @top_srcdir@
+
+# Copyright (c) 2013-2024 MPI-M, Luis Kornblueh, Rahul Sinha and DWD, Florian Prill. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
 lib_LTLIBRARIES = libmtime.la
 AM_CPPFLAGS = -I$(top_srcdir)/include
 AM_FCFLAGS = $(am__append_1)

--- a/src/eventwrapper.f90.notused
+++ b/src/eventwrapper.f90.notused
--- a/src/kepler.c
+++ b/src/kepler.c
+// Copyright (c) 2013-2024 MPI-M, Luis Kornblueh, Rahul Sinha and DWD, Florian Prill. All rights reserved.
+//
+// SPDX-License-Identifier: BSD-3-Clause
+//
 /*
 * Description:
 *

--- a/src/libmtime.f90
+++ b/src/libmtime.f90
+!! Copyright (c) 2013-2024 MPI-M, Luis Kornblueh, Rahul Sinha and DWD, Florian Prill. All rights reserved.
+!!
+!! SPDX-License-Identifier: BSD-3-Clause
+!!
 !> @file libmtime.f90
 !!
 !! @brief Providing the Fortran language bindings for libmtime