From 230111ab3d51883b1be6e96aad10e16e000087b0 Mon Sep 17 00:00:00 2001
From: Andrew Thompson <andrew@hijacked.us>
Date: Wed, 4 Mar 2015 16:20:01 +0000
Subject: [PATCH] Add support for rebar3 - remove use of rebar2 port compiler
 config

Rebar3 doesn't include a port compiler because it turns out it is too
brittle and unportable. Switch to a Makefile via a compile hook instead
to make things compatible with both rebar2 and rebar3.
---
 c_src/Makefile | 74 ++++++++++++++++++++++++++++++++++++++++++++++++++
 rebar.config   | 11 ++------
 2 files changed, 76 insertions(+), 9 deletions(-)
 create mode 100644 c_src/Makefile

diff --git a/c_src/Makefile b/c_src/Makefile
new file mode 100644
index 00000000..1eda565b
--- /dev/null
+++ b/c_src/Makefile
@@ -0,0 +1,74 @@
+# Based on c_src.mk from erlang.mk by Loic Hoguin <essen@ninenines.eu>
+
+CURDIR := $(shell pwd)
+BASEDIR := $(abspath $(CURDIR)/..)
+
+PROJECT ?= $(notdir $(BASEDIR))
+PROJECT := $(strip $(PROJECT))
+
+ERTS_INCLUDE_DIR ?= $(shell erl -noshell -s init stop -eval "io:format(\"~s/erts-~s/include/\", [code:root_dir(), erlang:system_info(version)]).")
+ERL_INTERFACE_INCLUDE_DIR ?= $(shell erl -noshell -s init stop -eval "io:format(\"~s\", [code:lib_dir(erl_interface, include)]).")
+ERL_INTERFACE_LIB_DIR ?= $(shell erl -noshell -s init stop -eval "io:format(\"~s\", [code:lib_dir(erl_interface, lib)]).")
+
+C_SRC_DIR = $(CURDIR)
+C_SRC_OUTPUT ?= $(CURDIR)/../priv/$(PROJECT).so
+
+# System type and C compiler/flags.
+
+UNAME_SYS := $(shell uname -s)
+ifeq ($(UNAME_SYS), Darwin)
+    CC ?= cc
+    CFLAGS ?= -O3 -std=c99 -arch x86_64 -finline-functions -Wall -Wmissing-prototypes 
+    CXXFLAGS ?= -O3 -arch x86_64 -finline-functions -Wall
+    LDFLAGS ?= -arch x86_64 -flat_namespace -undefined suppress
+else ifeq ($(UNAME_SYS), FreeBSD)
+    CC ?= cc
+    CFLAGS ?= -O3 -std=c99 -finline-functions -Wall -Wmissing-prototypes
+    CXXFLAGS ?= -O3 -finline-functions -Wall
+else ifeq ($(UNAME_SYS), Linux)
+    CC ?= gcc
+    CFLAGS ?= -O3 -std=c99 -finline-functions -Wall -Wmissing-prototypes
+    CXXFLAGS ?= -O3 -finline-functions -Wall
+endif
+
+CFLAGS += -fPIC -I $(ERTS_INCLUDE_DIR) -I $(ERL_INTERFACE_INCLUDE_DIR) -I leveldb/include
+CXXFLAGS += -fPIC -I $(ERTS_INCLUDE_DIR) -I $(ERL_INTERFACE_INCLUDE_DIR) -I leveldb/include
+
+LDLIBS += -L $(ERL_INTERFACE_LIB_DIR) -lerl_interface -lei
+LDFLAGS += -shared leveldb/libleveldb.a system/lib/libsnappy.a -lstdc++
+
+# Verbosity.
+
+c_verbose_0 = @echo " C     " $(?F);
+c_verbose = $(c_verbose_$(V))
+
+cpp_verbose_0 = @echo " CPP   " $(?F);
+cpp_verbose = $(cpp_verbose_$(V))
+
+link_verbose_0 = @echo " LD    " $(@F);
+link_verbose = $(link_verbose_$(V))
+
+SOURCES := $(shell find $(C_SRC_DIR) -maxdepth 1 -type f \( -name "*.c" -o -name "*.C" -o -name "*.cc" -o -name "*.cpp" \))
+OBJECTS = $(addsuffix .o, $(basename $(SOURCES)))
+
+COMPILE_C = $(c_verbose) $(CC) $(CFLAGS) $(CPPFLAGS) -c
+COMPILE_CPP = $(cpp_verbose) $(CXX) $(CXXFLAGS) $(CPPFLAGS) -c
+
+$(C_SRC_OUTPUT): $(OBJECTS)
+	@mkdir -p $(BASEDIR)/priv/
+	$(link_verbose) $(CC) $(OBJECTS) $(LDFLAGS) $(LDLIBS) -o $(C_SRC_OUTPUT)
+
+%.o: %.c
+	$(COMPILE_C) $(OUTPUT_OPTION) $<
+
+%.o: %.cc
+	$(COMPILE_CPP) $(OUTPUT_OPTION) $<
+
+%.o: %.C
+	$(COMPILE_CPP) $(OUTPUT_OPTION) $<
+
+%.o: %.cpp
+	$(COMPILE_CPP) $(OUTPUT_OPTION) $<
+
+clean:
+	@rm $(C_SRC_OUTPUT) $(OBJECTS)
diff --git a/rebar.config b/rebar.config
index f02d3680..171e0511 100644
--- a/rebar.config
+++ b/rebar.config
@@ -12,15 +12,8 @@
         {cuttlefish, ".*", {git, "git://github.com/basho/cuttlefish.git", {branch, "develop"}}}
        ]}.
 
-{port_env, [
-         %% Make sure to set -fPIC when compiling leveldb
-             {"CFLAGS", "$CFLAGS -Wall -O3 -fPIC"},
-             {"CXXFLAGS", "$CXXFLAGS -Wall -O3 -fPIC"},
-             {"DRV_CFLAGS", "$DRV_CFLAGS -O3 -Wall -I c_src/leveldb/include"},
-             {"DRV_LDFLAGS", "$DRV_LDFLAGS c_src/leveldb/libleveldb.a c_src/system/lib/libsnappy.a -lstdc++"}
-             ]}.
-
 {pre_hooks, [{'get-deps', "c_src/build_deps.sh get-deps"},
-             {compile, "c_src/build_deps.sh"}]}.
+             {compile, "c_src/build_deps.sh"},
+             {compile, "make -C c_src"}]}.
 
 {post_hooks, [{clean, "c_src/build_deps.sh clean"}]}.