From 8ead9a98a06b5ccae027678695e6a94b2b5774a5 Mon Sep 17 00:00:00 2001
From: Grzegorz Lyczba <grzegorz.lyczba@gmail.com>
Date: Mon, 2 May 2022 16:30:31 +0200
Subject: [PATCH] Use port_compiler to build nif

---
 c_src/Makefile | 80 --------------------------------------------------
 rebar.config   | 46 ++++++++++++++++++++++-------
 2 files changed, 36 insertions(+), 90 deletions(-)
 delete mode 100644 c_src/Makefile

diff --git a/c_src/Makefile b/c_src/Makefile
deleted file mode 100644
index bc404bd..0000000
--- a/c_src/Makefile
+++ /dev/null
@@ -1,80 +0,0 @@
-# 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
-MEMTEST_OUTPUT ?= $(CURDIR)/../_build/memory_test
-
-.PHONY: memory-test
-
-# System type and C compiler/flags.
-
-UNAME_SYS := $(shell uname -s)
-ifeq ($(UNAME_SYS), Darwin)
-	CXX ?= c++
-	CXXFLAGS += -O3 -finline-functions
-	LDFLAGS += -flat_namespace -undefined suppress
-	PSOURCES = prometheus_process_info_macos.cc
-else ifeq ($(UNAME_SYS), FreeBSD)
-	CXX ?= c++
-	CXXEFLAGS += -D__STANDALONE_TEST__ -std=c++11 -Wall
-	CXXFLAGS += -O3 -finline-functions
-	PSOURCES = prometheus_process_info_freebsd.cc
-else ifeq ($(UNAME_SYS), Linux)
-	CXX ?= g++
-	CXXEFLAGS += -D__STANDALONE_TEST__ -std=c++11 -Wall
-	CXXFLAGS += -O3 -finline-functions
-	PSOURCES = prometheus_process_info_linux.cc
-endif
-
-SOURCES = prometheus_process_collector_nif.cc $(PSOURCES)
-
-CXXFLAGS += -fPIC -I $(ERTS_INCLUDE_DIR) -I $(ERL_INTERFACE_INCLUDE_DIR) -std=c++11 -Wall
-LDLIBS += -L $(ERL_INTERFACE_LIB_DIR) -lei
-
-ifeq ($(UNAME_SYS), OpenBSD)
-	LDLIBS += -lestdc++
-else
-	LDLIBS += -lstdc++
-endif
-
-LDFLAGS += -shared
-
-# Verbosity.
-
-cpp_verbose_0 = @echo " CPP   " $(?F);
-cpp_verbose = $(cpp_verbose_$(V))
-
-link_verbose_0 = @echo " LD    " $(@F);
-link_verbose = $(link_verbose_$(V))
-
-OBJECTS = $(addsuffix .o, $(basename $(SOURCES)))
-
-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: %.cc
-	$(COMPILE_CPP) $(OUTPUT_OPTION) $<
-
-%.o: %.cpp
-	$(COMPILE_CPP) $(OUTPUT_OPTION) $<
-
-memory-test:
-	@mkdir -p $(BASEDIR)/_build/
-	$(CXX) $(CXXEFLAGS) $(LDLIBS) prometheus_process_info_mt.cc $(PSOURCES) -o $(MEMTEST_OUTPUT)
-	valgrind --leak-check=full --error-exitcode=1 $(MEMTEST_OUTPUT) 2
-
-clean:
-	@rm -f $(C_SRC_OUTPUT) $(OBJECTS)
diff --git a/rebar.config b/rebar.config
index 75ae1f8..c21b15e 100644
--- a/rebar.config
+++ b/rebar.config
@@ -1,12 +1,38 @@
-{erl_opts, [debug_info]}.
+{erl_opts, [debug_info,
+            {platform_define, "^(R14|R15|R16B|17)", 'random_module_available'},
+            {if_version_below, "23", {d, 'INCLUDE_ERL_INTERFACE'}}
+           ]}.
 {deps, [{prometheus, "~> 4.0"}]}.
 
-{pre_hooks,
- [{"linux|darwin", compile, "make -C c_src"},
-  {"freebsd", compile, "gmake -C c_src"}]}.
-{post_hooks,
- [{"linux|darwin", clean, "make -C c_src clean"},
-  {"freebsd", clean, "gmake -C c_src clean"}]}.
-
-{plugins, [{rebar3_archive_plugin, "0.0.2"},
-           rebar3_hex]}.
+{plugins, [
+            {pc, {git, "https://github.com/blt/port_compiler.git", {branch, "master"}}}
+          ]}.
+{port_specs, [
+    {".*-apple-darwin.*", "priv/prometheus_process_collector.so",
+        ["c_src/prometheus_process_collector_nif.cc", "c_src/prometheus_process_info_macos.cc"]
+    },
+    {".*-linux", "priv/prometheus_process_collector.so",
+        ["c_src/prometheus_process_collector_nif.cc", "c_src/prometheus_process_info_linux.cc"]
+    },
+    {".*-freebsd.*", "priv/prometheus_process_collector.so",
+        ["c_src/prometheus_process_collector_nif.cc", "c_src/prometheus_process_info_freebsd.cc"]
+    }
+]}.
+{port_env, [
+    {"CXXFLAGS", "-std=c++11 -Wall -O3 -arch x86_64 -finline-functions"},
+    {".*-linux", "CXX", "g++"},
+    {".*-apple-darwin.*", "CXX", "c++"},
+    {".*-freebsd.*", "CXX", "c++"}
+]}.
+{so_name, "prometheus_process_collector.so"}.
+{artifacts, ["priv/prometheus_process_collector.so"]}.
+{provider_hooks, [
+    {pre, [
+        {compile,
+            {pc, compile}
+        },
+        {clean,
+            {pc, clean}
+        }
+    ]}
+]}.