feat: WIP emscripten build script

Author: Totto16

platforms/build-web.sh

@@ -0,0 +1,125 @@
+#!/usr/bin/env bash
+
+set -e
+
+if [ ! -d "toolchains" ]; then
+    mkdir -p toolchains
+fi
+
+export EMSCRIPTEN_ROOT="$(pwd)/toolchains/emsdk"
+
+if [ ! -d "$EMSCRIPTEN_ROOT" ]; then
+    git clone https://github.com/emscripten-core/emsdk.git "$EMSCRIPTEN_ROOT"
+fi
+
+"$EMSCRIPTEN_ROOT/emsdk" install latest >/dev/null
+"$EMSCRIPTEN_ROOT/emsdk" activate latest >/dev/null
+
+# shellcheck disable=SC1091
+EMSDK_QUIET=1 source "$EMSCRIPTEN_ROOT/emsdk_env.sh" >/dev/null
+
+export EMSCRIPTEN_SYS_ROOT="$EMSCRIPTEN_ROOT/upstream/emscripten/cache/sysroot"
+
+export BUILD_DIR="build-emcc"
+
+export CC="emcc"
+export CXX="em++"
+export AR="emar"
+export RANLIB="emranlib"
+export STRIP="emstrip"
+
+export ARCH="wasm32"
+export CPU_ARCH="wasm32"
+export ENDIANESS="little"
+
+export COMMON_EMSCRIPTEN_OPTIONS="'-fexceptions', '-sEXCEPTION_CATCHING_ALLOWED=[..]'"
+
+# TODO see if ALLOW_MEMORY_GROWTH is needed, but if we load ttf's and music it likely is and we don't have to debug OOm crahses, that aren't handled by some thrid party library, which is painful
+export LINK_EMSCRIPTEN_OPTIONS="$COMMON_EMSCRIPTEN_OPTIONS, '-sEXPORT_ALL=1', '-sUSE_GLFW=3', '-sUSE_WEBGPU=1', '-sWASM=1', '-sALLOW_MEMORY_GROWTH=1', '-sNO_EXIT_RUNTIME=0', '-sASSERTIONS=1'"
+export COMPILE_EMSCRIPTEN_OPTIONS="$COMMON_EMSCRIPTEN_OPTIONS"
+
+export CROSS_FILE="./platforms/crossbuild-web.ini"
+
+cat <<EOF >"$CROSS_FILE"
+[host_machine]
+system = 'emscripten'
+cpu_family = '$ARCH'
+cpu = '$CPU_ARCH'
+endian = '$ENDIANESS'
+
+[target_machine]
+system = 'emscripten'
+cpu_family = '$ARCH'
+cpu = '$CPU_ARCH'
+endian = '$ENDIANESS'
+
+[constants]
+emscripten_root = '$(pwd)/emsdk'
+
+[binaries]
+c = '$CC'
+cpp = '$CXX'
+ar      = '$AR'
+ranlib  = '$RANLIB'
+strip   = '$STRIP'
+pkg-config = ['emmake', 'env', 'PKG_CONFIG_PATH=PREFIX_GOES_HERE/lib/pkgconfig', 'pkg-config']
+cmake = ['emmake', 'cmake']
+sdl2-config = ['emconfigure', 'sdl2-config']
+
+exe_wrapper = '$EMSDK_NODE'
+
+[built-in options]
+c_std = 'c11'
+cpp_std = 'c++20'
+c_args = [$COMPILE_EMSCRIPTEN_OPTIONS]
+c_link_args = [$LINK_EMSCRIPTEN_OPTIONS]
+cpp_args = [$COMPILE_EMSCRIPTEN_OPTIONS]
+cpp_link_args = [$LINK_EMSCRIPTEN_OPTIONS]
+
+[properties]
+needs_exe_wrapper = true
+sys_root = '$EMSCRIPTEN_SYS_ROOT'
+
+
+EOF
+
+## options: "smart, complete_rebuild"
+export COMPILE_TYPE="smart"
+
+export BUILDTYPE="debug"
+
+if [ "$#" -eq 0 ]; then
+    # nothing
+    echo "Using compile type '$COMPILE_TYPE'"
+elif [ "$#" -eq 1 ]; then
+    COMPILE_TYPE="$1"
+elif [ "$#" -eq 2 ]; then
+    COMPILE_TYPE="$1"
+    BUILDTYPE="$2"
+else
+    echo "Too many arguments given, expected 1 or 2"
+    exit 1
+fi
+
+if [ "$COMPILE_TYPE" == "smart" ]; then
+    : # noop
+elif [ "$COMPILE_TYPE" == "complete_rebuild" ]; then
+    : # noop
+else
+    echo "Invalid COMPILE_TYPE, expected: 'smart' or 'complete_rebuild'"
+    exit 1
+fi
+
+if [ "$COMPILE_TYPE" == "complete_rebuild" ] || [ ! -e "$BUILD_DIR" ]; then
+
+    meson setup "$BUILD_DIR" \
+        "--wipe" \
+        --cross-file "$CROSS_FILE" \
+        "-Dbuildtype=$BUILDTYPE" \
+        -Dcpp_args=-DAUDIO_PREFER_MP3 \
+        -Ddefault_library=static \
+        -Dfreetype2:zlib=disabled # TODI, since it's statically linked no duplicates are allowed, solve that
+
+fi
+
+meson compile -C "$BUILD_DIR"

tools/options/meson.build

@@ -94,7 +94,8 @@ elif cpp.get_id() == 'clang'
         # TODO: once clang with libstdc++ (gcc c++ stdlib) supports std::expected, remove this special behaviour
         allow_tl_expected_fallback = true
     endif
-
+elif cpp.get_id() == 'emscripten'
+    allow_tl_expected_fallback = true
 endif
 
 build_application = true