Support OTP 23 and later

CHANGELOG.md

@@ -1,3 +1,11 @@
+# Changelog for Ex_Cldr_Collation v0.4.0
+
+This is the changelog for Cldr_collation v0.4.0 released on April 9th, 2021.  For older changelogs please consult the release tag on [GitHub](https://github.com/elixir-cldr/cldr_units/tags)
+
+### Bug Fixes
+
+* Fix compilation issues on OTP 23 and later. On these releases, `liberl_interface.a` doesn't exist and isn't required.  Thanks to @zookzook for the report.
+
 # Changelog for Ex_Cldr_Collation v0.3.0
 
 This is the changelog for Cldr_collation v0.3.0 released on March 3rd, 2020.  For older changelogs please consult the release tag on [GitHub](https://github.com/elixir-cldr/cldr_units/tags)

c_src/Makefile

@@ -25,7 +25,16 @@ else ifeq ($(UNAME_SYS), Linux)
 endif
 
 CFLAGS += -fPIC -I$(ERTS_INCLUDE_DIR) -I$(ERL_INTERFACE_INCLUDE_DIR)
-LDLIBS += -L$(ERL_INTERFACE_LIB_DIR) -lerl_interface -lei
+
+# On OTP 23 and later, liberl_interface.a doesn't exist and
+# isn't requried
+
+ifneq ("$(wildcard $(ERL_INTERFACE_LIB_DIR)/liberl_interface.a)","")
+    LDLIBS += -L$(ERL_INTERFACE_LIB_DIR) -lerl_interface -lei
+else
+    LDLIBS += -L$(ERL_INTERFACE_LIB_DIR) -lei
+endif
+
 LDFLAGS += -shared
 
 ifeq ($(UNAME_SYS), Darwin)

mix.exs

@@ -1,7 +1,7 @@
 defmodule CldrCollation.MixProject do
   use Mix.Project
 
-  @version "0.3.0"
+  @version "0.4.0"
 
   def project do
     [
@@ -38,7 +38,7 @@ defmodule CldrCollation.MixProject do
   defp deps do
     [
       {:elixir_make, "~> 0.4", runtime: false},
-      {:ex_doc, "~> 0.19", only: [:dev, :release], runtime: false, optional: true},
+      {:ex_doc, "~> 0.19", runtime: false, optional: true},
       {:ex_cldr, "~> 2.0"},
       {:jason, "~> 1.0"}
     ]
@@ -80,7 +80,7 @@ defmodule CldrCollation.MixProject do
         "LICENSE.md",
         "CHANGELOG.md"
       ],
-      skip_undefined_reference_warnings_on: ["changelog"]
+      skip_undefined_reference_warnings_on: ["changelog", "CHANGELOG.md"]
     ]
   end