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Add Emscripten Python 3.14 WASM integration to CMake

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Major progress on Emscripten build:
- Built Python 3.14.2 for wasm32-emscripten using official Tools/wasm/emscripten
- Add EMSCRIPTEN detection with proper Python headers from cross-build
- Force MCRF_HEADLESS for Emscripten builds (no SFML yet)
- Link against libpython3.14.a (47MB WASM static lib)

Result: ALL 68 C++ source files compile successfully with emcc!
Only blocker remaining: libtcod needs WASM compilation

Build verified:
- Python LONG_BIT errors: FIXED (using wasm32-emscripten pyconfig.h)
- Source compilation: 100% success
- Link stage: fails on libtcod.so (next step)

Contributes to #158

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
John McCardle 2026-01-31 00:23:28 -05:00
commit 3bd996f317
1 changed files with 26 additions and 3 deletions
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29
CMakeLists.txt
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@ -11,6 +11,12 @@ set(CMAKE_CXX_STANDARD_REQUIRED True)
# Headless build option (no SFML, no graphics - for server/testing/Emscripten prep)
option(MCRF_HEADLESS "Build without graphics dependencies (SFML, ImGui)" OFF)
# Emscripten builds are always headless (no SFML yet - using stubs)
if(EMSCRIPTEN)
set(MCRF_HEADLESS ON)
message(STATUS "Emscripten detected - forcing HEADLESS mode")
endif()
if(MCRF_HEADLESS)
message(STATUS "Building in HEADLESS mode - no SFML/ImGui dependencies")
endif()
@ -25,8 +31,16 @@ endif()
include_directories(${CMAKE_SOURCE_DIR}/deps)
include_directories(SYSTEM ${CMAKE_SOURCE_DIR}/deps/libtcod)
# Python includes: use different paths for Windows vs Linux
if(MCRF_CROSS_WINDOWS)
# Python includes: use different paths for Windows vs Linux vs Emscripten
if(EMSCRIPTEN)
# Emscripten build: use Python headers compiled for wasm32-emscripten
# The pyconfig.h from cross-build has correct LONG_BIT and other settings
set(PYTHON_WASM_BUILD "${CMAKE_SOURCE_DIR}/deps/cpython/cross-build/wasm32-emscripten/build/python")
add_compile_options(-include ${PYTHON_WASM_BUILD}/pyconfig.h)
include_directories(${CMAKE_SOURCE_DIR}/deps/cpython/Include)
include_directories(${PYTHON_WASM_BUILD}) # For generated headers
message(STATUS "Using Emscripten Python from: ${PYTHON_WASM_BUILD}")
elseif(MCRF_CROSS_WINDOWS)
# Windows cross-compilation: use cpython headers with PC/pyconfig.h
# Problem: Python.h uses #include "pyconfig.h" which finds Include/pyconfig.h (Linux) first
# Solution: Use -include to force Windows pyconfig.h to be included first
@ -78,7 +92,16 @@ if(NOT MCRF_HEADLESS)
endif()
# Create a list of libraries to link against
if(MCRF_HEADLESS)
if(EMSCRIPTEN)
# Emscripten build: link against WASM-compiled Python
set(PYTHON_WASM_BUILD "${CMAKE_SOURCE_DIR}/deps/cpython/cross-build/wasm32-emscripten/build/python")
set(LINK_LIBS
${PYTHON_WASM_BUILD}/libpython3.14.a
tcod)
include_directories(${CMAKE_SOURCE_DIR}/deps/platform/linux) # Use Linux platform stubs for now
link_directories(${CMAKE_SOURCE_DIR}/__lib)
message(STATUS "Linking Emscripten Python: ${PYTHON_WASM_BUILD}/libpython3.14.a")
elseif(MCRF_HEADLESS)
# Headless build: no SFML, no OpenGL
if(WIN32 OR MCRF_CROSS_WINDOWS)
set(LINK_LIBS