Add: [CMake] JSON library (nlohmann)
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# nlohmann-json is a custom addition to the emscripten SDK, so it is possible
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# someone patched their SDK. Test out if the SDK supports nlohmann-json.
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include(CheckCXXSourceCompiles)
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set(CMAKE_REQUIRED_FLAGS "-sUSE_NLOHMANN_JSON=1")
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check_cxx_source_compiles("
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#include <nlohmann/json.hpp>
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int main() { return 0; }"
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NLOHMANN_JSON_FOUND
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)
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if (NLOHMANN_JSON_FOUND)
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add_library(nlohmann_json INTERFACE IMPORTED)
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set_target_properties(nlohmann_json PROPERTIES
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INTERFACE_COMPILE_OPTIONS "-sUSE_NLOHMANN_JSON=1"
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INTERFACE_LINK_LIBRARIES "-sUSE_NLOHMANN_JSON=1"
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)
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else()
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message(WARNING "You are using an emscripten SDK without nlohmann-json support. Please apply 'emsdk-nlohmann_json.patch' to your local emsdk installation.")
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endif()
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From 0edcedbea375e59f41df10acaee0c483d245751f Mon Sep 17 00:00:00 2001
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From: Patric Stout <truebrain@openttd.org>
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Date: Tue, 2 May 2023 21:48:08 +0200
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Subject: [PATCH] Add nlohmmann-json port
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---
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src/settings.js | 4 ++++
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tools/ports/nlohmann_json.py | 46 ++++++++++++++++++++++++++++++++++++
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tools/settings.py | 1 +
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3 files changed, 51 insertions(+)
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create mode 100644 tools/ports/nlohmann_json.py
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diff --git a/src/settings.js b/src/settings.js
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index f93140d..39f4366 100644
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--- a/src/settings.js
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+++ b/src/settings.js
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@@ -1483,6 +1483,10 @@ var USE_MPG123 = false;
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// [compile+link]
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var USE_FREETYPE = false;
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+// 1 = use nlohmann-json from emscripten-ports
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+// [compile+link]
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+var USE_NLOHMANN_JSON = false;
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+
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// Specify the SDL_mixer version that is being linked against.
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// Doesn't *have* to match USE_SDL, but a good idea.
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// [compile+link]
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diff --git a/tools/ports/nlohmann_json.py b/tools/ports/nlohmann_json.py
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new file mode 100644
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index 0000000..9e44297
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--- /dev/null
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+++ b/tools/ports/nlohmann_json.py
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@@ -0,0 +1,46 @@
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+# Copyright 2023 The Emscripten Authors. All rights reserved.
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+# Emscripten is available under two separate licenses, the MIT license and the
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+# University of Illinois/NCSA Open Source License. Both these licenses can be
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+# found in the LICENSE file.
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+
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+import os
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+
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+TAG = '3.11.2'
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+HASH = '99d9e6d588cabe8913a37437f86acb5d4b8b98bce12423e633c11c13b61e6c7f92ef8f9a4e991baa590329ee2b5c09ca9db9894bee1e54bdd68e8d09d83cc245'
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+
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+
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+def needed(settings):
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+ return settings.USE_NLOHMANN_JSON
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+
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+
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+def get(ports, settings, shared):
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+ ports.fetch_project('nlohmann_json',
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+ f'https://github.com/nlohmann/json/releases/download/v{TAG}/include.zip',
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+ sha512hash=HASH)
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+
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+ def create(final):
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+ source_path = os.path.join(ports.get_dir(), 'nlohmann_json')
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+ source_path_include = os.path.join(source_path, 'include', 'nlohmann')
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+ ports.install_header_dir(source_path_include, 'nlohmann')
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+
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+ # write out a dummy cpp file, to create an empty library
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+ # this is needed as emscripten ports expect this, even if it is not used
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+ dummy_file = os.path.join(source_path, 'dummy.cpp')
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+ shared.safe_ensure_dirs(os.path.dirname(dummy_file))
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+ ports.write_file(dummy_file, 'static void dummy() {}')
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+
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+ ports.build_port(source_path, final, 'nlohmann_json', srcs=['dummy.cpp'])
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+
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+ return [shared.cache.get_lib('libnlohmann_json.a', create, what='port')]
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+
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+
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+def clear(ports, settings, shared):
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+ shared.cache.erase_lib('libnlohmann_json.a')
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+
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+
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+def process_args(ports):
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+ return []
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+
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+
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+def show():
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+ return 'nlohmann-json'
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diff --git a/tools/settings.py b/tools/settings.py
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index 10d6ca0..8536092 100644
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--- a/tools/settings.py
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+++ b/tools/settings.py
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@@ -47,6 +47,7 @@ PORTS_SETTINGS = {
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'USE_MPG123',
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'USE_GIFLIB',
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'USE_FREETYPE',
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+ 'USE_NLOHMANN_JSON',
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'SDL2_MIXER_FORMATS',
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'SDL2_IMAGE_FORMATS',
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'USE_SQLITE3',
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--
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2.34.1
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