Working Draft: CMake build for Emscripten

CMakeLists.txt

+# Set the minimum we require to the minimum that Emscripten requires.
+# See the Emscripten toolchain file for details. 
+cmake_minimum_required(VERSION 3.4.3)
+
+project (adblockpluscore)
+
+#
+# Sanity check that the tool chain is set up correctly.
+#
+if (NOT "${CMAKE_SYSTEM_NAME}" STREQUAL "Emscripten")
+  message(FATAL_ERROR
+          "The Emscripten toolchain does not appear is not installed in the" 
+          "CMake cache. Please follow the instructions in README.CMAKE.")
+endif()
+
+#
+# Node.js is required to generate the bindings file.
+#
+if (${NODE_JS_EXECUTABLE} MATCHES "NOTFOUND")
+  message(FATAL_ERROR
+          "The Node interpreter was not found while setting up the Emscripten"
+          "toolchain.")
+endif()
+
+#
+# Legacy options from `compile` script
+# TODO: convert these to configurations
+#
+option(debug "Disable code minification")
+option(tracing "Enable memory tracing")
+
+#
+# Source file lists
+#
+file(GLOB_RECURSE ALL_SOURCES compiled/*.cpp)
+# Sort, so that the same source code always yields identical results.  
+list(SORT ALL_SOURCES)
+set(BINDINGS_GENERATOR_SOURCES ${ALL_SOURCES})
+set(CORE_SOURCES ${ALL_SOURCES})
+list(FILTER CORE_SOURCES EXCLUDE REGEX compiled/bindings/runtime_)
+
+#
+# Options for all targets 
+#
+add_compile_options(-std=c++1z)
+
+#
+# Target: bindings-generator
+#
+add_executable(bindings-generator ${BINDINGS_GENERATOR_SOURCES})
+target_link_libraries(bindings-generator
+                      "--js-library compiled/library.js"
+                      "--js-library compiled/bindings/library.js")
+
+#
+# Target: bindings
+#
+add_custom_target(bindings
+                  COMMAND ${NODE_JS_EXECUTABLE} bindings-generator >bindings.js
+                  BYPRODUCTS bindings.js)
+add_dependencies(bindings bindings-generator)
+
+
+#
+# Target: Core
+#
+add_executable(compiled ${CORE_SOURCES})
+add_dependencies(compiled bindings)
+
+target_compile_options(compiled PRIVATE
+                       -O3 -m32 
+                       --memory-init-file 0 --emit-symbol-map
+                       -Wall -Werror -fno-rtti)
+# Disabled. This option is present in the compile script (see its script 
+# variable ADDITIONAL_PARAMS). When present as a proper compile option, 
+# however, it yields an error "cannot use 'throw' with exceptions disabled" 
+# when added as a proper compile option.
+#target_compile_options(compiled PRIVATE -fno-exceptions)
+
+
+# 
+# CMake overloads `target_link_libraries` for both libraries (as stated) and 
+# for linker flags (very much not as a stated). In order for CMake to 
+# recognize an option with parameter, that is, with an embedded space, it 
+# requires that it be quoted.
+#                      
+target_link_libraries(compiled PRIVATE "--post-js bindings.js")
+#
+# The interaction between command line parsing of "-s SHELL_FILE=" and Windows
+# path names with backslashes is, frankly, insane. It's left as an exercise,
+# that is, waste of time, for the reader to divine all the levels of quoting
+# required to make it work.
+#
+file(GLOB SHELL_FILE compiled/shell.js)
+file(TO_NATIVE_PATH ${SHELL_FILE} SHELL_FILE)
+target_link_libraries(compiled PRIVATE "-s SHELL_FILE=\"\\\"${SHELL_FILE}\\\"\"")
+target_link_libraries(compiled PRIVATE "-s ASM_JS=2")
+target_link_libraries(compiled PRIVATE "-s TOTAL_MEMORY=16*1024*1024")
+target_link_libraries(compiled PRIVATE "-s TOTAL_STACK=1*1024*1024")
+target_link_libraries(compiled PRIVATE "-s ALLOW_MEMORY_GROWTH=1")
+target_link_libraries(compiled PRIVATE "-s NO_EXIT_RUNTIME=1")
+target_link_libraries(compiled PRIVATE "-s NO_DYNAMIC_EXECUTION=1")
+target_link_libraries(compiled PRIVATE "-s NO_FILESYSTEM=1")
+target_link_libraries(compiled PRIVATE "-s INVOKE_RUN=0")
+target_link_libraries(compiled PRIVATE "-s TEXTDECODER=0")
+target_link_libraries(compiled PRIVATE "-s EXPORTED_RUNTIME_METHODS=\"['cwrap','ccall','stringToAscii']\"")
+
+
+#
+# GENERAL TODO
+#
+# - Bindings and generator are in the root, unlike "compiled/" in the script.
+# - "compiled.js" is in the root, unlike "lib/" in the script.