p11ex

PRIV_DIR = $(MIX_APP_PATH)/priv
NIF_SO = $(PRIV_DIR)/p11ex_nif.so

PKCS11_BASE_URL = https://raw.githubusercontent.com/oasis-tcs/pkcs11/master/published/3-01
PKCS11_HEADERS = c_src/pkcs11.h c_src/pkcs11t.h c_src/pkcs11f.h

# Detect OS and architecture
UNAME_S := $(shell uname -s)
UNAME_M := $(shell uname -m)

# Find Erlang NIF header files
ERTS_INCLUDE_DIR = $(shell erl -eval 'io:format("~s~n", [lists:concat([code:root_dir(), "/erts-", erlang:system_info(version), "/include"])])' -s init stop -noshell)

# For macOS we still need ERL_ROOT for the bundle_loader path
ifeq ($(UNAME_S),Darwin)
    ERL_ROOT = $(shell erl -eval 'io:format("~s~n", [code:root_dir()])' -s init stop -noshell)
endif

# Map architecture names
ARCH = unknown
ifeq ($(UNAME_M),x86_64)
    ARCH = amd64
else ifeq ($(UNAME_M),amd64)
    ARCH = amd64
else ifeq ($(UNAME_M),arm64)
    ARCH = arm64
else ifeq ($(UNAME_M),aarch64)
    ARCH = arm64
endif

# Base flags for all platforms
CFLAGS = -fPIC -I$(ERTS_INCLUDE_DIR) -Wall -g

# Linux specific flags
ifeq ($(UNAME_S),Linux)
    LDFLAGS = -shared
    
    # Add ASAN flags for debug builds on Linux
    ifdef DEBUG
        CFLAGS += -fsanitize=address -fno-omit-frame-pointer
        LDFLAGS += -fsanitize=address
    endif
    
    # Add architecture-specific flags for Linux
    ifeq ($(ARCH),arm64)
        CFLAGS += -march=armv8-a
    else ifeq ($(ARCH),amd64)
        CFLAGS += -march=x86-64
    endif
endif

# macOS specific flags
ifeq ($(UNAME_S),Darwin)
    CFLAGS += -bundle -arch arm64
    LDFLAGS = -bundle_loader $(ERL_ROOT)/erts-*/bin/beam.smp
    
    # Add architecture-specific flags for macOS
    ifeq ($(ARCH),arm64)
        CFLAGS += -arch arm64
    else ifeq ($(ARCH),amd64)
        CFLAGS += -arch x86_64
    endif
endif

.PHONY: all clean

all: $(NIF_SO)

$(PKCS11_HEADERS):
	mkdir -p c_src
	@echo "Downloading $(notdir $@) from $(PKCS11_BASE_URL)"
	curl -fL -o $@ $(PKCS11_BASE_URL)/$(notdir $@)

$(NIF_SO): c_src/p11ex_nif.c $(PKCS11_HEADERS)
	mkdir -p $(PRIV_DIR)
	$(CC) $(CFLAGS) -o $@ $< $(LDFLAGS)

clean:
	rm -f $(NIF_SO)