build: Move scripts/*.cmake.in to scripts/cmake/; add cmake/AUTHORS.md

From the libpng licensing point of view, the build projects, the build
scripts, the test scripts, the CI verification scripts, et cetera, have
not traditionally been part of libpng proper, although some of these,
including the CMake-based build, have been released under the libpng
license.

Considering how the CMake build grew as a result of many contributions
from many contributing authors over a long time, one may argue that it
almost became an individual piece of software in its own right.

Moving on, everything CMake-related shall be placed in the subdirectory
scripts/cmake/ (except, of course, the main CMakeLists.txt). Moreover,
contributing authors shall be acknowledged in scripts/cmake/AUTHORS.md.

Please see scripts/cmake/README.md for more information.

CMakeLists.txt

@@ -1,37 +1,19 @@
-# CMakeLists.txt
 
-# Copyright (c) 2018-2023 Cosmin Truta
+# CMakeLists.txt - CMake lists for libpng
-# Copyright (c) 2007,2009-2018 Glenn Randers-Pehrson
+#
-# Written by Christian Ehrlicher, 2007
+# Copyright (c) 2018-2024 Cosmin Truta.
-# Revised by Roger Lowman, 2009-2010
+# Copyright (c) 2007-2018 Glenn Randers-Pehrson.
-# Revised by Clifford Yapp, 2011-2012,2017
+# Originally written by Christian Ehrlicher, 2007.
-# Revised by Claudio Bley, 2013
+#
-# Revised by Roger Leigh, 2016
+# Use, modification and distribution are subject to
-# Revised by Andreas Franek, 2016
+# the same licensing terms and conditions as libpng.
-# Revised by Sam Serrels, 2017
+# Please see the copyright notice in png.h or visit
-# Revised by Vadim Barkov, 2017
+# http://libpng.org/pub/png/src/libpng-LICENSE.txt
-# Revised by Vicky Pfau, 2018
+#
-# Revised by Cameron Cawley, 2018,2021
+# For copyright and licensing purposes, please see
-# Revised by Kyle Bentley, 2018
+# the accompanying file scripts/cmake/AUTHORS.md
-# Revised by David Callu, 2020
+#
-# Revised by Steve Robinson, 2020
+# SPDX-License-Identifier: libpng-2.0
-# Revised by Simon Hausmann, 2020
-# Revised by Alex Gaynor, 2020
-# Revised by Owen Rudge, 2020
-# Revised by Gleb Mazovetskiy, 2021
-# Revised by Christopher Sean Morrison, 2022
-# Revised by B. Scott Michel, 2022
-# Revised by Jeremy Maitin-Shepard, 2022
-# Revised by Martin Storsjo, 2022
-# Revised by Jon Creighton, 2023
-# Revised by Gunther Nikl, 2023
-# Revised by Tyler Kropp, 2023
-# Revised by Timothy Lyanguzov, 2023
-# Revised by Clinton Ingram, 2023
-
-# This code is released under the libpng license.
-# For conditions of distribution and use, see the disclaimer
-# and license in png.h
 
 cmake_minimum_required(VERSION 3.6)
 
@@ -370,7 +352,7 @@ else()
                        COMMAND "${CMAKE_COMMAND}"
                                "-DINPUT=${_GC_INPUT}"
                                "-DOUTPUT=${_GC_OUTPUT}"
-                               -P "${CMAKE_CURRENT_BINARY_DIR}/scripts/genchk.cmake"
+                               -P "${CMAKE_CURRENT_BINARY_DIR}/genchk.cmake"
                        DEPENDS "${_GC_INPUT}" ${_GC_DEPENDS}
                        WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}")
   endfunction()
@@ -393,7 +375,7 @@ else()
                        COMMAND "${CMAKE_COMMAND}"
                                "-DINPUT=${_GO_INPUT}"
                                "-DOUTPUT=${_GO_OUTPUT}"
-                               -P "${CMAKE_CURRENT_BINARY_DIR}/scripts/genout.cmake"
+                               -P "${CMAKE_CURRENT_BINARY_DIR}/genout.cmake"
                        DEPENDS "${_GO_INPUT}" ${_GO_DEPENDS}
                        WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}")
   endfunction()
@@ -412,7 +394,7 @@ else()
     add_custom_command(OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/${_GSO_OUTPUT}"
                        COMMAND "${CMAKE_COMMAND}"
                                "-DOUTPUT=${_GSO_OUTPUT}"
-                               -P "${CMAKE_CURRENT_BINARY_DIR}/scripts/gensrc.cmake"
+                               -P "${CMAKE_CURRENT_BINARY_DIR}/gensrc.cmake"
                        DEPENDS ${_GSO_DEPENDS}
                        WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}")
   endfunction()
@@ -542,7 +524,7 @@ else()
   add_custom_target(png_genprebuilt
                     COMMAND "${CMAKE_COMMAND}"
                             "-DOUTPUT=scripts/pnglibconf.h.prebuilt"
-                            -P "${CMAKE_CURRENT_BINARY_DIR}/scripts/gensrc.cmake"
+                            -P "${CMAKE_CURRENT_BINARY_DIR}/gensrc.cmake"
                     WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}")
 
   # A single target handles generation of all generated files.
@@ -750,7 +732,7 @@ if(PNG_TESTS AND PNG_SHARED)
     set(TEST_OPTIONS "${_PAT_OPTIONS}")
     set(TEST_FILES "${_PAT_FILES}")
 
-    configure_file("${CMAKE_CURRENT_SOURCE_DIR}/scripts/test.cmake.in"
+    configure_file("${CMAKE_CURRENT_SOURCE_DIR}/scripts/cmake/test.cmake.in"
                    "${CMAKE_CURRENT_BINARY_DIR}/tests/${_PAT_NAME}.cmake"
                    @ONLY)
     add_test(NAME "${_PAT_NAME}"
@@ -984,14 +966,14 @@ function(create_symlink DEST_FILE)
 endfunction()
 
 # Create source generation scripts.
-configure_file(${CMAKE_CURRENT_SOURCE_DIR}/scripts/genchk.cmake.in
+configure_file(${CMAKE_CURRENT_SOURCE_DIR}/scripts/cmake/genchk.cmake.in
-               ${CMAKE_CURRENT_BINARY_DIR}/scripts/genchk.cmake
+               ${CMAKE_CURRENT_BINARY_DIR}/genchk.cmake
                @ONLY)
-configure_file(${CMAKE_CURRENT_SOURCE_DIR}/scripts/genout.cmake.in
+configure_file(${CMAKE_CURRENT_SOURCE_DIR}/scripts/cmake/genout.cmake.in
-               ${CMAKE_CURRENT_BINARY_DIR}/scripts/genout.cmake
+               ${CMAKE_CURRENT_BINARY_DIR}/genout.cmake
                @ONLY)
-configure_file(${CMAKE_CURRENT_SOURCE_DIR}/scripts/gensrc.cmake.in
+configure_file(${CMAKE_CURRENT_SOURCE_DIR}/scripts/cmake/gensrc.cmake.in
-               ${CMAKE_CURRENT_BINARY_DIR}/scripts/gensrc.cmake
+               ${CMAKE_CURRENT_BINARY_DIR}/gensrc.cmake
                @ONLY)
 
 # libpng is a library so default to 'lib'

scripts/cmake/AUTHORS.md

@@ -0,0 +1,35 @@
+CMake Files, Lists and Scripts for the PNG Reference Library
+============================================================
+
+Author List
+-----------
+
+ * Alex Gaynor
+ * Andreas Franek
+ * B. Scott Michel
+ * Cameron Cawley
+ * Christian Ehrlicher
+ * Christopher Sean Morrison
+ * Claudio Bley
+ * Clifford Yapp
+ * Clinton Ingram
+ * Cosmin Truta
+ * David Callu
+ * Gleb Mazovetskiy
+ * Glenn Randers-Pehrson
+ * Gunther Nikl
+ * Jeremy Maitin-Shepard
+ * John Bowler
+ * Jon Creighton
+ * Kyle Bentley
+ * Martin Storsjö
+ * Owen Rudge
+ * Roger Leigh
+ * Roger Lowman
+ * Sam Serrels
+ * Simon Hausmann
+ * Steve Robinson
+ * Timothy Lyanguzov
+ * Tyler Kropp
+ * Vadim Barkov
+ * Vicky Pfau

scripts/cmake/README.md

@@ -0,0 +1,35 @@
+CMake Files, Lists and Scripts for the PNG Reference Library
+============================================================
+
+Copyright Notice
+----------------
+
+ * Copyright (c) 2018-2024 Cosmin Truta.
+ * Copyright (c) 2007-2018 Glenn Randers-Pehrson.
+ * Originally written by Christian Ehrlicher, 2007.
+
+Use, modification and distribution of the CMake
+files in the libpng distribution are subject to
+the same licensing terms and conditions as libpng.
+Please see the copyright notice in `png.h` or visit
+http://libpng.org/pub/png/src/libpng-LICENSE.txt
+
+File List
+---------
+
+    CMakeLists.txt                 ==>  The main CMake lists file
+    scripts/cmake/AUTHORS.md       ==>  The Authors file
+    scripts/cmake/README.md        ==>  This file
+    scripts/cmake/genchk.cmake.in  ==>  Template for genchk.cmake
+    scripts/cmake/genout.cmake.in  ==>  Template for genout.cmake
+    scripts/cmake/gensrc.cmake.in  ==>  Template for gensrc.cmake
+    scripts/cmake/test.cmake.in    ==>  Template for test.cmake
+
+Acknowledgements
+----------------
+
+See the accompanying file `scripts/cmake/AUTHORS.md`
+for the list of Contributing Authors.
+
+If you are a Contributing Author, please make sure
+that you are being acknowledged.

scripts/cmake/genchk.cmake.in

@@ -1,13 +1,16 @@
 # genchk.cmake.in
 # Generate .chk from .out with awk (generic), based upon the automake logic.
 
-# Copyright (c) 2022-2023 Cosmin Truta
+# Copyright (c) 2022-2024 Cosmin Truta
 # Copyright (c) 2016 Glenn Randers-Pehrson
 # Written by Roger Leigh, 2016
-
+#
-# This code is released under the libpng license.
+# Use, modification and distribution are subject to
-# For conditions of distribution and use, see the disclaimer
+# the same licensing terms and conditions as libpng.
-# and license in png.h
+# Please see the copyright notice in png.h or visit
+# http://libpng.org/pub/png/src/libpng-LICENSE.txt
+#
+# SPDX-License-Identifier: libpng-2.0
 
 # Variables substituted from CMakeLists.txt
 set(SRCDIR "@CMAKE_CURRENT_SOURCE_DIR@")

scripts/cmake/genout.cmake.in

@@ -1,13 +1,16 @@
 # genout.cmake.in
 # Generate .out from .c with awk (generic), based upon the automake logic.
 
-# Copyright (c) 2022-2023 Cosmin Truta
+# Copyright (c) 2022-2024 Cosmin Truta
 # Copyright (c) 2016 Glenn Randers-Pehrson
 # Written by Roger Leigh, 2016
-
+#
-# This code is released under the libpng license.
+# Use, modification and distribution are subject to
-# For conditions of distribution and use, see the disclaimer
+# the same licensing terms and conditions as libpng.
-# and license in png.h
+# Please see the copyright notice in png.h or visit
+# http://libpng.org/pub/png/src/libpng-LICENSE.txt
+#
+# SPDX-License-Identifier: libpng-2.0
 
 # Variables substituted from CMakeLists.txt
 set(SRCDIR "@CMAKE_CURRENT_SOURCE_DIR@")

scripts/cmake/gensrc.cmake.in

@@ -1,13 +1,16 @@
 # gensrc.cmake.in
 # Generate source files with awk, based upon the automake logic.
 
-# Copyright (c) 2022-2023 Cosmin Truta
+# Copyright (c) 2022-2024 Cosmin Truta
 # Copyright (c) 2016 Glenn Randers-Pehrson
 # Written by Roger Leigh, 2016
-
+#
-# This code is released under the libpng license.
+# Use, modification and distribution are subject to
-# For conditions of distribution and use, see the disclaimer
+# the same licensing terms and conditions as libpng.
-# and license in png.h
+# Please see the copyright notice in png.h or visit
+# http://libpng.org/pub/png/src/libpng-LICENSE.txt
+#
+# SPDX-License-Identifier: libpng-2.0
 
 # Variables substituted from CMakeLists.txt
 set(SRCDIR "@CMAKE_CURRENT_SOURCE_DIR@")
@@ -135,5 +138,7 @@ elseif(OUTPUT STREQUAL "scripts/pnglibconf.h.prebuilt")
   message(FATAL_ERROR "Stopping build")
 
 else()
+
   message(FATAL_ERROR "Unsupported output: ${OUTPUT}")
+
 endif()

scripts/cmake/test.cmake.in

@@ -1,11 +1,15 @@
 # test.cmake.in
 
-# Copyright (C) 2016 Glenn Randers-Pehrson
+# Copyright (c) 2024 Cosmin Truta
+# Copyright (c) 2016 Glenn Randers-Pehrson
 # Written by Roger Leigh, 2016
-
+#
-# This code is released under the libpng license.
+# Use, modification and distribution are subject to
-# For conditions of distribution and use, see the disclaimer
+# the same licensing terms and conditions as libpng.
-# and license in png.h
+# Please see the copyright notice in png.h or visit
+# http://libpng.org/pub/png/src/libpng-LICENSE.txt
+#
+# SPDX-License-Identifier: libpng-2.0
 
 set(TEST_OPTIONS "@TEST_OPTIONS@")
 set(TEST_FILES "@TEST_FILES@")
@@ -22,8 +26,7 @@ if(WIN32)
   set(ENV{PATH} "${LIBPNG_DIR};$ENV{PATH}")
 endif()
 
-execute_process(COMMAND "${CMAKE_COMMAND}" -E echo "Running ${TEST_COMMAND}" ${TEST_OPTIONS} ${NATIVE_TEST_FILES})
+message("Running ${TEST_COMMAND}" ${TEST_OPTIONS} ${NATIVE_TEST_FILES})
-
 execute_process(COMMAND "${TEST_COMMAND}" ${TEST_OPTIONS} ${NATIVE_TEST_FILES}
                 RESULT_VARIABLE TEST_STATUS)
 if(TEST_STATUS)