Build vendored dependencies

.gitignore

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+/build_config.rb.lock
+
+/dest/*
+!/dest/.keep

Makefile

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+.PHONY: clean
+
+CCPREFIX = /home/kotovalexarian/repos/global/tailix/cross/root/bin/x86_64-elf-
+
+AR     = $(CCPREFIX)ar
+AS     = $(CCPREFIX)as
+CC     = $(CCPREFIX)gcc
+LD     = $(CCPREFIX)ld
+RANLIB = $(CCPREFIX)ranlib
+
+RAKE = rake
+
+ROOT = $(shell pwd)
+DEST = $(ROOT)/dest
+MRUBY_CONFIG = $(ROOT)/build_config.rb
+
+MRUBY_NAME = mrubyvisor
+
+clean:
+	rm -rf $(DEST)/*
+
+dest/lib/libkernaux.a:
+	cd vendor/libkernaux && ./autogen.sh
+	cd vendor/libkernaux && ./configure --host='x86_64-elf' --prefix='$(DEST)' --enable-freestanding --with-drivers --with-libc AR='$(AR)' AS='$(AS)' CC='$(CC)' LD='$(LD)' RANLIB='$(RANLIB)'
+	cd vendor/libkernaux && make
+	cd vendor/libkernaux && make install
+
+dest/lib/libmruby.a: dest/lib/libkernaux.a
+	cd vendor/mruby && $(RAKE) MRUBY_CONFIG='$(MRUBY_CONFIG)' CROSS_AR='$(AR)' CROSS_CC='$(CC)' CROSS_LD='$(LD)'
+	mkdir -p $(DEST)/include $(DEST)/lib
+	cp vendor/mruby/build/$(MRUBY_NAME)/lib/libmruby.a $(DEST)/lib
+	cp -r vendor/mruby/include/* $(DEST)/include
+	cp -r vendor/mruby/build/$(MRUBY_NAME)/include/* $(DEST)/include

build_config.rb

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+ROOT_DIR = File.expand_path(__dir__).freeze
+DEST_DIR = File.join(ROOT_DIR, 'dest').freeze
+
+MRuby::CrossBuild.new 'mrubyvisor' do |conf|
+  conf.toolchain :gcc
+
+  conf.cc.defines   <<
+    'MRB_NO_BOXING' <<
+    'MRB_NO_FLOAT'  <<
+    'MRB_NO_STDIO'
+
+  conf.cc.flags      <<
+    '-Wall'          <<
+    '-Wextra'        <<
+    '-ffreestanding' <<
+    '-nostdlib'      <<
+    '-fno-pic'       <<
+    '-fno-stack-protector'
+
+  conf.cc.include_paths <<     File.join(DEST_DIR, 'include')
+  conf.linker.library_paths << File.join(DEST_DIR, 'lib')
+
+  conf.archiver.command = ENV['CROSS_AR']
+  conf.cc.command       = ENV['CROSS_CC']
+  conf.linker.command   = ENV['CROSS_LD']
+end