From b908a7a79aea70f3e7226570f243a99643b55cdd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Lo=C3=AFc=20Hoguin?= <essen@ninenines.eu>
Date: Mon, 14 Aug 2017 21:40:28 +0200
Subject: Add experimental pinning of Erlang/OTP version

By defining the ERLANG_OTP or ERLANG_HIPE variable, you
can let Erlang.mk manage which version of Erlang/OTP will
be used for your project. It will build it if necessary,
and will activate it automatically when make is invoked.
---
 core/kerl.mk | 78 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 core/kerl.mk

(limited to 'core')

diff --git a/core/kerl.mk b/core/kerl.mk
new file mode 100644
index 0000000..7846370
--- /dev/null
+++ b/core/kerl.mk
@@ -0,0 +1,78 @@
+# Copyright (c) 2015-2017, Loïc Hoguin <essen@ninenines.eu>
+# This file is part of erlang.mk and subject to the terms of the ISC License.
+
+.PHONY: distclean-kerl
+
+KERL_INSTALL_DIR ?= $(HOME)/erlang
+
+ifeq ($(strip $(KERL)),)
+KERL := $(ERLANG_MK_TMP)/kerl/kerl
+endif
+
+export KERL
+
+KERL_GIT ?= https://github.com/kerl/kerl
+KERL_COMMIT ?= master
+
+KERL_MAKEFLAGS ?=
+
+OTP_GIT ?= https://github.com/erlang/otp
+
+define kerl_otp_target
+ifeq ($(wildcard $(KERL_INSTALL_DIR)/$(1)),)
+$(KERL_INSTALL_DIR)/$(1): $(KERL)
+	MAKEFLAGS="$(KERL_MAKEFLAGS)" $(KERL) build git $(OTP_GIT) $(1) $(1)
+	$(KERL) install $(1) $(KERL_INSTALL_DIR)/$(1)
+endif
+endef
+
+define kerl_hipe_target
+ifeq ($(wildcard $(KERL_INSTALL_DIR)/$1-native),)
+$(KERL_INSTALL_DIR)/$1-native: $(KERL)
+	KERL_CONFIGURE_OPTIONS=--enable-native-libs \
+		MAKEFLAGS="$(KERL_MAKEFLAGS)" $(KERL) build git $(OTP_GIT) $1 $1-native
+	$(KERL) install $1-native $(KERL_INSTALL_DIR)/$1-native
+endif
+endef
+
+$(KERL):
+	$(verbose) mkdir -p $(ERLANG_MK_TMP)
+	$(gen_verbose) git clone --depth 1 $(KERL_GIT) $(ERLANG_MK_TMP)/kerl
+	$(verbose) cd $(ERLANG_MK_TMP)/kerl && git checkout $(KERL_COMMIT)
+	$(verbose) chmod +x $(KERL)
+
+distclean:: distclean-kerl
+
+distclean-kerl:
+	$(gen_verbose) rm -rf $(KERL)
+
+# Allow users to select which version of Erlang/OTP to use for a project.
+
+ERLANG_OTP ?=
+ERLANG_HIPE ?=
+
+# Use kerl to enforce a specific Erlang/OTP version for a project.
+ifneq ($(strip $(ERLANG_OTP)),)
+export ERLANG_OTP
+export PATH := $(KERL_INSTALL_DIR)/$(ERLANG_OTP)/bin:$(PATH)
+$(eval $(call kerl_otp_target,$(ERLANG_OTP)))
+
+# Build Erlang/OTP only if it doesn't already exist.
+ifeq ($(wildcard $(KERL_INSTALL_DIR)/$(ERLANG_OTP)),)
+BUILD_ERLANG_OTP := $(shell $(MAKE) $(KERL_INSTALL_DIR)/$(ERLANG_OTP))
+endif
+
+else
+# Same for a HiPE enabled VM.
+ifneq ($(strip $(ERLANG_HIPE)),)
+export ERLANG_HIPE
+export PATH := $(KERL_INSTALL_DIR)/$(ERLANG_HIPE)-native/bin:$(PATH)
+$(eval $(call kerl_hipe_target,$(ERLANG_HIPE)))
+
+# Build Erlang/OTP only if it doesn't already exist.
+ifeq ($(wildcard $(KERL_INSTALL_DIR)/$(ERLANG_HIPE)),)
+BUILD_ERLANG_OTP := $(shell $(MAKE) $(KERL_INSTALL_DIR)/$(ERLANG_HIPE))
+endif
+
+endif
+endif
-- 
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