From 11513bae43915f9fc2b95a56961c703d82636116 Mon Sep 17 00:00:00 2001
From: dearblue <dearblue@users.osdn.me>
Date: Sun, 12 Feb 2023 21:02:32 +0900
Subject: [PATCH] Make `bin/mruby-config` output a directory based on itself

---
 mrbgems/mruby-bin-config/mrbgem.rake      | 18 ++++++++++--
 mrbgems/mruby-bin-config/mruby-config.bat | 12 ++++++++
 tasks/libmruby.rake                       | 35 +++++++++++++++++++----
 3 files changed, 58 insertions(+), 7 deletions(-)

diff --git a/mrbgems/mruby-bin-config/mrbgem.rake b/mrbgems/mruby-bin-config/mrbgem.rake
index b4c437640..8a484d69c 100644
--- a/mrbgems/mruby-bin-config/mrbgem.rake
+++ b/mrbgems/mruby-bin-config/mrbgem.rake
@@ -11,7 +11,16 @@ MRuby::Gem::Specification.new('mruby-bin-config') do |spec|
   else
     mruby_config_dir = "#{build.build_dir}/bin"
   end
-  mruby_config = name + (ENV['OS'] == 'Windows_NT' ? '.bat' : '')
+
+  if ENV['OS'] == 'Windows_NT'
+    suffix = '.bat'
+    refvar = '%\\1%'
+  else
+    suffix = ''
+    refvar = '${\\1}'
+  end
+
+  mruby_config = name + suffix
   mruby_config_path = "#{mruby_config_dir}/#{mruby_config}"
   make_cfg = "#{build.build_dir}/lib/libmruby.flags.mak"
   tmplt_path = "#{__dir__}/#{mruby_config}"
@@ -24,11 +33,16 @@ MRuby::Gem::Specification.new('mruby-bin-config') do |spec|
 
   directory mruby_config_dir
 
-  file mruby_config_path => [mruby_config_dir, make_cfg, tmplt_path] do |t|
+  file mruby_config_path => [__FILE__, mruby_config_dir, make_cfg, tmplt_path] do |t|
     config = Hash[File.readlines(make_cfg).map!(&:chomp).map! {|l|
+      l.gsub!(/\$\((\w+)\)/, refvar)
       l.gsub('\\"', '"').split(' = ', 2).map! {|s| s.sub(/^(?=.)/, 'echo ')}
     }]
     tmplt = File.read(tmplt_path)
+    tmplt.sub!(%r((?<=\A#!/bin/sh\n\n)), <<~SETDIR)
+      MRUBY_PACKAGE_DIR=$(dirname "$(dirname "$(readlink -f "$0")")")
+
+    SETDIR
     File.write(t.name, tmplt.gsub(/(#{Regexp.union(*config.keys)})\b/, config))
     chmod(0755, t.name)
   end
diff --git a/mrbgems/mruby-bin-config/mruby-config.bat b/mrbgems/mruby-bin-config/mruby-config.bat
index 949fea06f..8d8a589fe 100644
--- a/mrbgems/mruby-bin-config/mruby-config.bat
+++ b/mrbgems/mruby-bin-config/mruby-config.bat
@@ -1,5 +1,17 @@
 @echo off
 
+call :init "%~dp0."
+goto top
+
+:init
+rem call init2 for treatments last directory separator
+call :init2 "%~dp1."
+goto :eof
+
+:init2
+set MRUBY_PACKAGE_DIR=%~f1
+goto :eof
+
 :top
 shift
 if "%0" equ "" goto :eof
diff --git a/tasks/libmruby.rake b/tasks/libmruby.rake
index 3f357c921..cc25aa047 100644
--- a/tasks/libmruby.rake
+++ b/tasks/libmruby.rake
@@ -38,16 +38,41 @@ MRuby.each_target do
   file "#{build_dir}/lib/libmruby.flags.mak" => [__FILE__, libmruby_static] do |t|
     mkdir_p File.dirname t.name
     open(t.name, 'w') do |f|
-      gemincs = gems.map { |g| g.export_include_paths.map { |n| g.filename(n) } }.flatten.uniq
-      f.puts "MRUBY_CFLAGS = #{cc.all_flags([], gemincs)}"
+      f.puts <<~FLAGS_MAKE
+        # GNU make is required to use this file.
+        MRUBY_PACKAGE_DIR_GNU := $(shell dirname "$(firstword $(MAKEFILE_LIST))")
+        MRUBY_PACKAGE_DIR != dirname "$(MRUBY_PACKAGE_DIR_GNU)"
+      FLAGS_MAKE
+
+      [
+        [cc,   "MRUBY_CC",   "MRUBY_CFLAGS"],
+        [cxx,  "MRUBY_CXX",  "MRUBY_CXXFLAGS"],
+        [asm,  "MRUBY_AS",   "MRUBY_ASFLAGS"],
+        [objc, "MRUBY_OBJC", "MRUBY_OBJCFLAGS"]
+      ].each do |cc, cmd, flags|
+        incpaths = cc.include_paths.dup
+        dirmaps = {
+          MRUBY_ROOT => "$(MRUBY_PACKAGE_DIR)",
+          build_dir => "$(MRUBY_PACKAGE_DIR)"
+        }
+        gems.each do |g|
+          incpaths.concat g.export_include_paths
+          dirmaps[g.dir] = "$(MRUBY_PACKAGE_DIR)/include/mruby/gems/#{g.name}"
+          dirmaps[g.build_dir] = "$(MRUBY_PACKAGE_DIR)/include/mruby/gems/#{g.name}"
+        end
+        modcc = cc.clone
+        modcc.include_paths = incpaths.replace_prefix_by(dirmaps).uniq
+
+        f.puts "#{cmd} = #{cc.command}"
+        f.puts "#{flags} = #{modcc.all_flags}"
+      end
 
-      f.puts "MRUBY_CC = #{cc.command}"
       f.puts "MRUBY_LD = #{linker.command}"
 
       libgems = gems.reject{|g| g.bin?}
       gem_flags = libgems.map {|g| g.linker.flags }
       gem_library_paths = libgems.map {|g| g.linker.library_paths }
-      f.puts "MRUBY_LDFLAGS = #{linker.all_flags(gem_library_paths, gem_flags)} #{linker.option_library_path % "#{build_dir}/lib"}"
+      f.puts "MRUBY_LDFLAGS = #{linker.all_flags(gem_library_paths, gem_flags)} #{linker.option_library_path % "$(MRUBY_PACKAGE_DIR)/lib"}"
 
       gem_flags_before_libraries = libgems.map {|g| g.linker.flags_before_libraries }
       f.puts "MRUBY_LDFLAGS_BEFORE_LIBS = #{[linker.flags_before_libraries, gem_flags_before_libraries].flatten.join(' ')}"
@@ -55,7 +80,7 @@ MRuby.each_target do
       gem_libraries = libgems.map {|g| g.linker.libraries }
       f.puts "MRUBY_LIBS = #{linker.option_library % 'mruby'} #{linker.library_flags(gem_libraries)}"
 
-      f.puts "MRUBY_LIBMRUBY_PATH = #{libmruby_static}"
+      f.puts "MRUBY_LIBMRUBY_PATH = #{libmruby_static.replace_prefix_by(build_dir => "$(MRUBY_PACKAGE_DIR)")}"
     end
   end