Improve build system

Makefile

@@ -29,7 +29,12 @@ LIBKERNAUX_ARGS =       \
 	--with-drivers        \
 	--with-libc
 
-MRUBY_NAME = mrubyvisor
+MRUBY_FLAGS =     \
+	-DMRB_NO_BOXING \
+	-DMRB_NO_FLOAT  \
+	-DMRB_NO_STDIO
+
+MRUBY_BUILD_NAME = mrubyvisor
 
 .PHONY: $(IMAGE) $(MRUBYVISOR)
 
@@ -59,7 +64,7 @@ $(IMAGE): $(GRUBCFG) $(MRUBYVISOR)
 	grub-mkrescue $(ROOTFS) -o $@
 
 $(MRUBYVISOR): $(LIBKERNAUX) $(LIBMRUBY)
-	$(MAKE) -C $(SRC) mrubyvisor.multiboot2 CCPREFIX='$(CCPREFIX)' DEST='$(ABS_REPO)/$(DEST)'
+	$(MAKE) -C $(SRC) mrubyvisor.multiboot2 CCPREFIX='$(CCPREFIX)' DEST='$(ABS_REPO)/$(DEST)' MRUBY_FLAGS='$(MRUBY_FLAGS)'
 	cp $(SRC)/mrubyvisor.multiboot2 $@
 
 $(LIBKERNAUX):
@@ -70,8 +75,8 @@ $(LIBKERNAUX):
 
 $(LIBMRUBY): $(LIBKERNAUX) $(MRUBY_CONF)
 	$(MAKE) clean-mruby
-	cd vendor/mruby && $(RAKE) MRUBY_CONFIG='$(ABS_REPO)/$(MRUBY_CONF)' CROSS_AR='$(AR)' CROSS_CC='$(CC)' CROSS_LD='$(LD)'
+	cd vendor/mruby && $(RAKE) MRUBY_CONFIG='$(ABS_REPO)/$(MRUBY_CONF)' CROSS_AR='$(AR)' CROSS_CC='$(CC)' CROSS_LD='$(LD)' FLAGS='$(MRUBY_FLAGS)' BUILD_NAME='$(MRUBY_BUILD_NAME)' INCLUDE_DIR='$(ABS_REPO)/$(DEST)/include' LIB_DIR='$(ABS_REPO)/$(DEST)/lib'
 	mkdir -p $(DEST)/include $(DEST)/lib
-	cp vendor/mruby/build/$(MRUBY_NAME)/lib/libmruby.a $(DEST)/lib
+	cp vendor/mruby/build/$(MRUBY_BUILD_NAME)/lib/libmruby.a $(DEST)/lib
 	cp -r vendor/mruby/include/* $(DEST)/include
-	cp -r vendor/mruby/build/$(MRUBY_NAME)/include/* $(DEST)/include
+	cp -r vendor/mruby/build/$(MRUBY_BUILD_NAME)/include/* $(DEST)/include

build_config.rb

@@ -1,16 +1,8 @@
-ROOT_DIR = File.expand_path(__dir__).freeze
-DEST_DIR = File.join(ROOT_DIR, 'dest').freeze
-
-MRuby::CrossBuild.new 'mrubyvisor' do |conf|
+MRuby::CrossBuild.new ENV.fetch 'BUILD_NAME' do |conf|
   conf.toolchain :gcc
 
   conf.gem core: 'mruby-compiler'
 
-  conf.cc.defines   <<
-    'MRB_NO_BOXING' <<
-    'MRB_NO_FLOAT'  <<
-    'MRB_NO_STDIO'
-
   conf.cc.flags      <<
     '-Wall'          <<
     '-Wextra'        <<
@@ -19,10 +11,15 @@ MRuby::CrossBuild.new 'mrubyvisor' do |conf|
     '-fno-pic'       <<
     '-fno-stack-protector'
 
-  conf.cc.include_paths <<     File.join(DEST_DIR, 'include')
-  conf.linker.library_paths << File.join(DEST_DIR, 'lib')
+  ENV.fetch('FLAGS').split.map do |flag|
+    m = /\A-D(MRB_.*)\z/.match flag
+    conf.cc.defines << m[1] if m
+  end
 
-  conf.archiver.command = ENV['CROSS_AR']
-  conf.cc.command       = ENV['CROSS_CC']
-  conf.linker.command   = ENV['CROSS_LD']
+  conf.cc.include_paths     << ENV.fetch('INCLUDE_DIR')
+  conf.linker.library_paths << ENV.fetch('LIB_DIR')
+
+  conf.archiver.command = ENV.fetch 'CROSS_AR'
+  conf.cc.command       = ENV.fetch 'CROSS_CC'
+  conf.linker.command   = ENV.fetch 'CROSS_LD'
 end

src/Makefile

@@ -16,11 +16,9 @@ CFLAGS = \
 	-fno-stack-protector \
 	-I$(DEST)/include
 
-CPPFLAGS = \
+CPPFLAGS =        \
+	$(MRUBY_FLAGS)  \
 	-DKERNAUX_DEBUG \
-	-DMRB_NO_BOXING \
-	-DMRB_NO_FLOAT  \
-	-DMRB_NO_STDIO
 
 OBJS = start.S.o main.c.o