# Prevent executing `go env ...` multiple times for the same property
# export is needed for this and also to pass the values on to the Go compiler
ifndef GOOS
export GOOS != go env GOHOSTOS
endif
ifndef GOARCH
export GOARCH != go env GOHOSTARCH
endif

ifeq (windows,$(GOOS))
LIB_PREFIX ?=
LIB_SUFFIX ?= .dll
else ifeq (darwin,$(GOOS))
LIB_PREFIX ?= lib
LIB_SUFFIX ?= .dylib
else
LIB_PREFIX ?= lib
LIB_SUFFIX ?= .so
endif

# Library name without prefixes/suffixes
LIB_NAME ?= eduvpn_common
# Library file name
LIB_FILE ?= $(LIB_PREFIX)$(LIB_NAME)$(LIB_SUFFIX)

# Get relative exports/ directory when included from a wrapper
EXPORTS_PATH = $(dir $(lastword $(MAKEFILE_LIST)))
# Remove trailing slash
EXPORTS_PATH := $(EXPORTS_PATH:/=)

EXPORTS_LIB_PATH ?= $(EXPORTS_PATH)/lib
EXPORTS_LIB_SUBFOLDER_PATH ?= $(EXPORTS_LIB_PATH)/$(GOOS)/$(GOARCH)

# Add library to dynamic linker path for running tests
ifeq (Windows_NT,$(OS))
export PATH := $(abspath $(EXPORTS_LIB_SUBFOLDER_PATH)):$(PATH)
else
export LD_LIBRARY_PATH := $(abspath $(EXPORTS_LIB_SUBFOLDER_PATH)):$(LD_LIBRARY_PATH)
endif

.try-build-lib:
ifneq ($(wildcard $(EXPORTS_PATH)/Makefile),)
	$(MAKE) -C $(EXPORTS_PATH)
else
$(info Skipping building library as exports/Makefile was not found)
endif