project Runtime_Build is
  for Languages use ("Ada", "C", "Asm_Cpp");

  for Library_Auto_Init use "False";
  for Library_Name use "gnat";
  for Library_Kind use "static";

  for Library_Dir use "adalib";
  for Object_Dir use "obj";

  for Source_Dirs use ("arch", "common", "math");

  type Build_Type is ("Production", "Debug");

  Build : Build_Type := external ("BUILD", "Production");

  package Builder is
     for Switches ("Ada") use ("--RTS=" & Project'project_dir);
  end Builder;

  package Compiler is
     CFLAGS := ("-fcallgraph-info=su,da",
                "-ffunction-sections", "-fdata-sections");
     ASMFLAGS := ();
     case Build is
        when "Production" =>
           CFLAGS := CFLAGS & ("-O2");
        when "Debug" =>
           CFLAGS := CFLAGS & ("-O0", "-g");
           ASMFLAGS := ASMFLAGS & ("-g");
     end case;
     ALL_ADAFLAGS := ("-gnatpg", "-gnatn2", "-nostdinc") & CFLAGS;
     ALL_CFLAGS := ("-DIN_RTS", "-Dinhibit_libc") & CFLAGS;

     NO_SIBLING_ADAFLAGS := ("-fno-optimize-sibling-calls");
     NO_REORDER_ADAFLAGS := ("-fno-toplevel-reorder");

     for Switches ("C") use ALL_CFLAGS;
     for Switches ("Ada") use ALL_ADAFLAGS;
     for Switches ("Asm_Cpp") use ASMFLAGS;

     --  Some runtime files need to be compiled with debug info
     for Switches ("s-traceb.adb") use ALL_ADAFLAGS & ("-g")
       & NO_SIBLING_ADAFLAGS & ("-fno-inline-functions-called-once");
     for Switches ("s-tasdeb.adb") use ALL_ADAFLAGS & ("-g", "-O0");
     for Switches ("a-except.adb") use ALL_ADAFLAGS
       & ("-g", "-O1", "-fno-inline") & NO_REORDER_ADAFLAGS;
     for Switches ("s-excdeb.adb") use ALL_ADAFLAGS & ("-g", "-O0");
     for Switches ("s-assert.adb") use ALL_ADAFLAGS & ("-g");
     for Switches ("a-tags.adb") use ALL_ADAFLAGS & ("-g");
     for Switches ("raise-gcc.c") use ALL_CFLAGS & ("-fexceptions");
  end Compiler;
end Runtime_Build;