Makefile.win

# Builds the WebUI NIF on Windows with MSVC (nmake). Linux and macOS use Makefile.
#
# WebUI is linked statically, so priv\webui_nif.dll is self-contained -- there
# is no webui-2.dll to locate at runtime, which is the whole reason this route
# was chosen over dynamic linking on Windows.
#
# No erl_nif import library is linked, and none is needed: on Windows erl_nif.h
# routes every enif_* call through the WinDynNifCallbacks function-pointer
# table, which the emulator fills in when it calls nif_init. Nothing to resolve
# at link time.
#
# webui-2-static.lib is MSVC-built (the release CI runs nmake with
# WEBUI_WEBVIEW_STATIC=1), so this must be built from a Developer Command
# Prompt. That same flag means lib.exe has already merged WebView2LoaderStatic
# into the archive, so it is not listed here.
#
# Driven by `mix compile` via elixir_make. To build against a local WebUI
# checkout rather than the bootstrapped one:
#
#   set WEBUI_DIR=C:\path\to\webui\dist
#   set WEBUI_INCLUDE=C:\path\to\webui\include
#   mix compile

!IFNDEF MIX_APP_PATH
MIX_APP_PATH = .
!ENDIF

PRIV_DIR = $(MIX_APP_PATH)\priv
NIF = $(PRIV_DIR)\webui_nif.dll

!IF "$(WEBUI_DIR)" == ""
WEBUI_LIB_DIR = webui-windows-msvc-x64
!ELSE
WEBUI_LIB_DIR = $(WEBUI_DIR)
!ENDIF

!IF "$(WEBUI_INCLUDE)" == ""
WEBUI_INCLUDE_DIR = $(WEBUI_LIB_DIR)
!ELSE
WEBUI_INCLUDE_DIR = $(WEBUI_INCLUDE)
!ENDIF

WEBUI_STATIC = $(WEBUI_LIB_DIR)\webui-2-static.lib

SOURCES = c_src\webui_nif.c
OBJ_DIR = $(MIX_APP_PATH)\obj

CFLAGS = /nologo /O2 /W3 /MD /D_CRT_SECURE_NO_WARNINGS \
	/I"$(ERTS_INCLUDE_DIR)" /I"$(WEBUI_INCLUDE_DIR)"

# ws2_32/ole32 are WebUI's own (see the dynamic link line in webui's Makefile);
# the rest back the Win32 and WebView2 paths. msvcprt matches /MD and supplies
# the C++ runtime for win32_wv2.obj, which is compiled /Zl and so carries no
# default-library directive of its own.
SYSLIBS = ws2_32.lib ole32.lib oleaut32.lib user32.lib shell32.lib \
	advapi32.lib gdi32.lib version.lib msvcprt.lib

all: $(NIF)

# Depending on the static library, not just the C source, matters now that
# bootstrap defaults to nightly: re-bootstrapping must relink the NIF.
$(NIF): $(SOURCES) $(WEBUI_STATIC)
	@if not exist "$(PRIV_DIR)" mkdir "$(PRIV_DIR)"
	@if not exist "$(OBJ_DIR)" mkdir "$(OBJ_DIR)"
	@REM /IMPLIB keeps the import library (and its .exp) that MSVC emits for any
	@REM DLL with exports out of priv/. The NIF is loaded dynamically, so this
	@REM byproduct is never used -- priv/ should hold only webui_nif.dll.
	cl $(CFLAGS) /LD $(SOURCES) /Fo"$(OBJ_DIR)\\" /Fe:"$(NIF)" \
		/link "$(WEBUI_STATIC)" $(SYSLIBS) /IMPLIB:"$(OBJ_DIR)\webui_nif.lib"

$(WEBUI_STATIC):
	@echo.
	@echo WebUI static library not found at $(WEBUI_STATIC)
	@echo.
	@echo Fetch it with:
	@echo     bootstrap.bat
	@echo.
	@echo Or point the build at a local WebUI checkout:
	@echo     set WEBUI_DIR=C:\path\to\webui\dist
	@echo     set WEBUI_INCLUDE=C:\path\to\webui\include
	@echo.
	@exit 1

clean:
	@if exist "$(NIF)" del /Q "$(NIF)"
	@if exist "$(OBJ_DIR)" rmdir /S /Q "$(OBJ_DIR)"