# Makefile for pb.c_runtime — the optional C-acceleration runtime.
#
# Output sits at ../c_runtime.{so,dylib} so that
#   require('pb.c_runtime')
# resolves it via the LUA_CPATH the Justfile sets for `just test`
# (see Justfile lua_cpath: "./runtime/?.so;./runtime/?.dylib;...").
#
# Built only when PB_ENABLE_C=1 is part of the user's workflow.
# Pure-Lua install ignores this directory entirely.

# Locate <module.h>. Order: env override, brew prefix, common system dirs.
# Mirrors bench/c_accel/Makefile.
TT_INC ?= $(shell \
	if [ -n "$$TARANTOOL_INCLUDE" ] && [ -f "$$TARANTOOL_INCLUDE/module.h" ]; then \
		echo "$$TARANTOOL_INCLUDE"; exit 0; \
	fi; \
	for d in \
		$$(brew --prefix tarantool 2>/dev/null)/include/tarantool \
		/opt/homebrew/include/tarantool \
		/usr/local/include/tarantool \
		/usr/include/tarantool; do \
		if [ -f "$$d/module.h" ]; then echo "$$d"; exit 0; fi; \
	done)

ifeq ($(TT_INC),)
$(error Cannot find <module.h>; set TARANTOOL_INCLUDE=/path/to/include/tarantool or install tarantool-dev)
endif

UNAME_S := $(shell uname -s)

CFLAGS  := -O2 -fPIC -Wall -Wextra -std=c99 -I$(TT_INC)
ifeq ($(UNAME_S),Darwin)
	LIB_EXT := dylib
	LDFLAGS := -bundle -undefined dynamic_lookup
else
	LIB_EXT := so
	LDFLAGS := -shared
endif

SRCS    := c_runtime.c
OBJS    := $(SRCS:.c=.o)
OUTPUT  := ../c_runtime.$(LIB_EXT)

all: $(OUTPUT)

$(OUTPUT): $(OBJS)
	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $(OBJS)

%.o: %.c
	$(CC) $(CFLAGS) -c -o $@ $<

clean:
	rm -f *.o $(OUTPUT)

.PHONY: all clean