mirror of
https://github.com/EsotericSoftware/spine-runtimes.git
synced 2026-02-06 07:14:55 +08:00
[cpp] nostdlib build to be used with WASM and other environments that do not want stdlibc++ linked in.
This commit is contained in:
Mario Zechner
parent
3927ff25ff
commit
aaca02ad81
@ -3,6 +3,8 @@ project(spine-cpp)
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include(${CMAKE_CURRENT_LIST_DIR}/../flags.cmake)
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option(SPINE_NO_FILE_IO "Disable file I/O operations" OFF)
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include_directories(include)
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file(GLOB INCLUDES "include/**/*.h")
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file(GLOB SOURCES "src/**/*.cpp")
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@ -10,6 +12,15 @@ file(GLOB SOURCES "src/**/*.cpp")
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add_library(spine-cpp STATIC ${SOURCES} ${INCLUDES})
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target_include_directories(spine-cpp PUBLIC include)
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if(SPINE_NO_FILE_IO)
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target_compile_definitions(spine-cpp PRIVATE SPINE_NO_FILE_IO)
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endif()
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# nostdcpp variant (no C++ standard library)
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file(GLOB NOSTDCPP_SOURCES ${SOURCES} "src/nostdlib.cpp")
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add_library(spine-cpp-nostdcpp STATIC ${NOSTDCPP_SOURCES} ${INCLUDES})
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target_include_directories(spine-cpp-nostdcpp PUBLIC include)
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# Install target
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install(TARGETS spine-cpp EXPORT spine-cpp_TARGETS DESTINATION dist/lib)
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install(FILES ${INCLUDES} DESTINATION dist/include)
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@ -24,4 +35,28 @@ export(
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if(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
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add_executable(headless-test ${CMAKE_CURRENT_SOURCE_DIR}/tests/HeadlessTest.cpp)
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target_link_libraries(headless-test spine-cpp)
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if(SPINE_NO_FILE_IO)
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target_compile_definitions(headless-test PRIVATE SPINE_NO_FILE_IO)
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endif()
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# nostdcpp test executable (no C++ stdlib)
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add_executable(headless-test-nostdcpp ${CMAKE_CURRENT_SOURCE_DIR}/tests/HeadlessTest.cpp)
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if(MSVC)
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# On Windows/MSVC, disable default libraries but keep C runtime
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target_link_libraries(headless-test-nostdcpp spine-cpp-nostdcpp)
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target_link_options(headless-test-nostdcpp PRIVATE /NODEFAULTLIB)
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target_link_libraries(headless-test-nostdcpp msvcrt kernel32)
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else()
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# Unix/Linux: avoid linking libstdc++ automatically
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if(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
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target_link_libraries(headless-test-nostdcpp spine-cpp-nostdcpp)
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target_link_options(headless-test-nostdcpp PRIVATE -nostdlib++ -lc)
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else()
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# GCC: use -nodefaultlibs and link minimal libraries including libgcc for operator new/delete
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target_link_options(headless-test-nostdcpp PRIVATE -nodefaultlibs)
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target_link_libraries(headless-test-nostdcpp spine-cpp-nostdcpp -lm -lc -lgcc)
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endif()
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endif()
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endif()
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@ -3,11 +3,38 @@ set -e
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cd "$(dirname "$0")"
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# Clean only if explicitly requested
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if [ "$1" = "clean" ]; then
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# Parse arguments
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BUILD_TYPE="debug"
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NOFILEIO=""
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CLEAN=""
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for arg in "$@"; do
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case $arg in
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clean)
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CLEAN="true"
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;;
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release)
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BUILD_TYPE="release"
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;;
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debug)
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BUILD_TYPE="debug"
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;;
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nofileio)
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NOFILEIO="-DSPINE_NO_FILE_IO=ON"
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;;
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*)
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echo "Unknown argument: $arg"
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echo "Usage: $0 [clean] [release|debug] [nofileio]"
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exit 1
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;;
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esac
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done
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# Clean if requested
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if [ "$CLEAN" = "true" ]; then
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rm -rf build
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fi
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# Always build
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cmake --preset=debug .
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cmake --build --preset=debug
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# Configure and build
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cmake --preset=$BUILD_TYPE $NOFILEIO .
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cmake --build --preset=$BUILD_TYPE
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54
spine-cpp/src/nostdlib.cpp
Normal file
54
spine-cpp/src/nostdlib.cpp
Normal file
@ -0,0 +1,54 @@
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/*
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* Minimal runtime stubs for nostdlib spine-cpp build
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*
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* Provides minimal implementations of C++ runtime symbols required
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* for spine-cpp to work without the standard library.
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*/
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#include <cstddef>
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// ============================================================================
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// C++ Runtime Stubs
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// ============================================================================
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// Memory operators - basic malloc/free wrappers
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// Note: These require a C library that provides malloc/free
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extern "C" {
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void* malloc(size_t size);
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void free(void* ptr);
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}
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// Memory operators - use malloc/free but with careful implementation
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// Make them weak so system can override if needed
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__attribute__((weak)) void* operator new(size_t size) {
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return malloc(size);
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}
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__attribute__((weak)) void operator delete(void* ptr) {
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if (ptr) free(ptr);
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}
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// Static initialization guards (single-threaded stubs)
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// Make them weak so system can override if needed
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extern "C" __attribute__((weak)) int __cxa_guard_acquire(char* guard) {
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return *guard == 0 ? (*guard = 1, 1) : 0;
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}
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extern "C" __attribute__((weak)) void __cxa_guard_release(char* guard) {
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// No-op for single-threaded
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(void)guard;
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}
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// Pure virtual function handler
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extern "C" __attribute__((weak)) void __cxa_pure_virtual() {
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// In a real implementation, this would abort or throw
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// For minimal stub, we'll just return (undefined behavior but won't crash)
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// This should never be called in a correctly written program
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}
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// Stack protection (for GCC -fstack-protector)
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// Make it weak so libc can override it in static builds
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extern "C" __attribute__((weak)) char __stack_chk_guard = 0;
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extern "C" __attribute__((weak)) void __stack_chk_fail() {
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// Could call abort() or be no-op for minimal runtime
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}
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@ -101,7 +101,7 @@ void DefaultSpineExtension::_free(void *mem, const char *file, int line) {
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}
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char *DefaultSpineExtension::_readFile(const String &path, int *length) {
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#ifndef __EMSCRIPTEN__
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#if !defined(__EMSCRIPTEN__) && !defined(SPINE_NO_FILE_IO)
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char *data;
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FILE *file = fopen(path.buffer(), "rb");
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if (!file) return 0;
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82
spine-cpp/test-nostdlib.sh
Executable file
82
spine-cpp/test-nostdlib.sh
Executable file
@ -0,0 +1,82 @@
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#!/bin/bash
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set -e
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cd "$(dirname "$0")"
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# Build or reuse Docker image
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IMAGE_NAME="spine-cpp-nostdcpp-test"
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if ! docker image inspect $IMAGE_NAME >/dev/null 2>&1; then
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echo "Building Docker image (one-time setup)..."
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docker build -t $IMAGE_NAME - <<'EOF'
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FROM ubuntu:22.04
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RUN apt-get update >/dev/null 2>&1 && \
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apt-get install -y build-essential cmake ninja-build git file >/dev/null 2>&1 && \
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rm -rf /var/lib/apt/lists/*
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EOF
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fi
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echo "Running spine-cpp nostdcpp test..."
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# Run Docker container with spine-runtimes directory mounted
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docker run --rm \
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-v "$(pwd)/..:/workspace/spine-runtimes" \
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-w /workspace/spine-runtimes/spine-cpp \
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$IMAGE_NAME \
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bash -c "
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# Build everything first
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echo '=== Building all variants ==='
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./build.sh clean release >/dev/null 2>&1
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# Try to build static regular executable
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echo 'Building static regular executable...'
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g++ -static -o build/headless-test-static build/CMakeFiles/headless-test.dir/tests/HeadlessTest.cpp.o build/libspine-cpp.a >/dev/null 2>&1 || echo 'Static regular build failed'
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# Try to build static nostdcpp executable (multiple approaches)
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echo 'Building static nostdcpp executable...'
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# Approach 1: Try with -static-libgcc and -static-libstdc++ but no libstdc++
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if g++ -static -static-libgcc -Wl,--exclude-libs,libstdc++.a -o build/headless-test-nostdcpp-static build/CMakeFiles/headless-test-nostdcpp.dir/tests/HeadlessTest.cpp.o build/libspine-cpp-nostdcpp.a -lm -lc 2>/dev/null; then
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echo 'SUCCESS: Static nostdcpp built (approach 1)'
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# Approach 2: Try minimal static linking
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elif g++ -static -o build/headless-test-nostdcpp-static-minimal build/CMakeFiles/headless-test-nostdcpp.dir/tests/HeadlessTest.cpp.o build/libspine-cpp-nostdcpp.a 2>/dev/null; then
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echo 'SUCCESS: Static nostdcpp built (approach 2 - minimal)'
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else
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echo 'All static nostdcpp approaches failed - static linking may not be practical on this system'
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fi
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echo ''
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echo '=== FINAL RESULTS ==='
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echo ''
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echo 'File sizes:'
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for exe in build/headless-test*; do
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if [ -f \"\$exe\" ]; then
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ls -lah \"\$exe\" | awk '{printf \"%-30s %s\\n\", \$9, \$5}'
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fi
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done
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echo ''
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echo 'Dependencies:'
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for exe in build/headless-test*; do
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if [ -f \"\$exe\" ]; then
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echo \"\$(basename \$exe):\"
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ldd \"\$exe\" 2>/dev/null || echo \" (statically linked)\"
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echo ''
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fi
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done
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echo 'Functional test:'
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if [ -f build/headless-test-nostdcpp ]; then
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echo 'Testing headless-test-nostdcpp with spineboy...'
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if OUTPUT=\$(./build/headless-test-nostdcpp ../examples/spineboy/export/spineboy-pro.skel ../examples/spineboy/export/spineboy-pma.atlas idle 2>&1); then
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echo \"\$OUTPUT\" | head -10
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echo '... (output truncated)'
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echo 'SUCCESS: nostdcpp executable works!'
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else
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echo 'FAILED: nostdcpp executable failed to run'
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echo \"Error: \$OUTPUT\"
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fi
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else
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echo 'nostdcpp executable not found'
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fi
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"
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