Add multiple of the pointer target size

rakelib/shared.rb

@@ -2,4 +2,71 @@
 # v. 2.0. If a copy of the MPL was not distributed with this file, You can
 # obtain one at https://mozilla.org/MPL/2.0/. -}
 
+GCC_VERSION = "14.2.0"
+
 TMP = Pathname.new('./build')
+
+class BuildTarget
+  attr_accessor(:build, :gcc, :target, :tmp)
+
+  def gxx
+    @gcc.gsub 'c', '+'
+  end
+
+  def sysroot
+    tmp + 'sysroot'
+  end
+
+  def rootfs
+    tmp + 'rootfs'
+  end
+
+  def tools
+    tmp + 'tools'
+  end
+
+  def configuration
+    case target
+    when /^riscv[[:digit:]]+-/
+      [
+        '--with-arch=rv32imafdc',
+        '--with-abi=ilp32d',
+        '--with-tune=rocket',
+        '--with-isa-spec=20191213'
+      ]
+    else
+      []
+    end
+  end
+end
+
+def gcc_verbose(gcc_binary)
+  read, write = IO.pipe
+  sh({'LANG' => 'C'}, gcc_binary, '--verbose', err: write)
+  write.close
+  output = read.read
+  read.close
+  output
+end
+
+def find_build_target(gcc_version, target)
+  gcc_binary = 'gcc'
+  output = gcc_verbose gcc_binary
+
+  if output.start_with? 'Apple clang'
+    gcc_binary = "gcc-#{gcc_version.split('.').first}"
+    output = gcc_verbose gcc_binary
+  end
+  result = output
+    .lines
+    .each_with_object(BuildTarget.new) do |line, accumulator|
+      if line.start_with? 'Target: '
+        accumulator.build = line.split(' ').last.strip
+      elsif line.start_with? 'COLLECT_GCC'
+        accumulator.gcc = line.split('=').last.strip
+      end
+    end
+  result.tmp = TMP
+  result.target = target
+  result
+end