method

convertible_int

v2_4_6 - Show latest stable - Class: MakeMakefile

convertible_int(type, headers = nil, opts = nil, &b)

public

Returns the convertible integer type of the given type. You may optionally specify additional headers to search in for the type. convertible means actually the same type, or typedef’d from the same type.

If the type is an integer type and the convertible type is found, the following macros are passed as preprocessor constants to the compiler using the type name, in uppercase.

TYPEOF_, followed by the type name, followed by =X where “X” is the found convertible type name.
TYP2NUM and NUM2TYP, where TYP is the type name in uppercase with replacing an _t suffix with “T”, followed by =X where “X” is the macro name to convert type to an Integer object, and vice versa.

For example, if foobar_t is defined as unsigned long, then convertible_int(“foobar_t”) would return “unsigned long”, and define these macros:

#define TYPEOF_FOOBAR_T unsigned long
#define FOOBART2NUM ULONG2NUM
#define NUM2FOOBART NUM2ULONG

# File lib/mkmf.rb, line 1394
  def convertible_int(type, headers = nil, opts = nil, &b)
    type, macname = *type
    checking_for("convertible type of #{type}", STRING_OR_FAILED_FORMAT) do
      if UNIVERSAL_INTS.include?(type)
        type
      else
        typedef, member, prelude = typedef_expr(type, headers, &b)
        if member
          prelude << "static rbcv_typedef_ rbcv_var;"
          compat = UNIVERSAL_INTS.find {|t|
            try_static_assert("sizeof(rbcv_var.#{member}) == sizeof(#{t})", [prelude], opts, &b)
          }
        else
          next unless signed = try_signedness(typedef, member, [prelude])
          u = "unsigned " if signed > 0
          prelude << "extern rbcv_typedef_ foo();"
          compat = UNIVERSAL_INTS.find {|t|
            try_compile([prelude, "extern #{u}#{t} foo();"].join("\n"), opts, :werror=>true, &b)
          }
        end
        if compat
          macname ||= type.sub(/_(?=t\z)/, '').tr_cpp
          conv = (compat == "long long" ? "LL" : compat.upcase)
          compat = "#{u}#{compat}"
          typename = type.tr_cpp
          $defs.push(format("-DSIZEOF_%s=SIZEOF_%s", typename, compat.tr_cpp))
          $defs.push(format("-DTYPEOF_%s=%s", typename, compat.quote))
          $defs.push(format("-DPRI_%s_PREFIX=PRI_%s_PREFIX", macname, conv))
          conv = (u ? "U" : "") + conv
          $defs.push(format("-D%s2NUM=%s2NUM", macname, conv))
          $defs.push(format("-DNUM2%s=NUM2%s", macname, conv))
          compat
        end
      end
    end
  end

convertible_int

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