ofrubyをXcode6でビルドしようとしたら変なリンクエラーが出た。

ld: warning: ignoring file ../../../libs/FreeImage/lib/ios/freeimage.a, missing required architecture i386 in file ../../../libs/FreeImage/lib/ios/freeimage.a (2 slices)
ld: warning: ignoring file ../../../libs/glu/lib/ios/glu-ios.a, missing required architecture i386 in file ../../../libs/glu/lib/ios/glu-ios.a (2 slices)
Undefined symbols for architecture i386:
  "_fwrite$UNIX2003", referenced from:
      _WriteProc(void*, unsigned int, unsigned int, void*) in freeimage.a(FreeImageIO.o-i386)
      LibRaw::dcraw_thumb_writer(char const*) in freeimage.a(libraw_cxx.o-i386)
      _opj_image_create in freeimage.a(image.o-i386)
      _png_default_write_data in freeimage.a(pngwio.o-i386)
      LibRaw::ppm_thumb() in freeimage.a(dcraw_common.o-i386)
      LibRaw::jpeg_thumb_writer(__sFILE*, char*, int) in freeimage.a(dcraw_common.o-i386)
      LibRaw::write_ppm_tiff() in freeimage.a(dcraw_common.o-i386)
      ...
  "_mktime$UNIX2003", referenced from:
      LibRaw::get_timestamp(int) in freeimage.a(dcraw_common.o-i386)
      LibRaw::parse_rollei() in freeimage.a(dcraw_common.o-i386)
      LibRaw::parse_riff() in freeimage.a(dcraw_common.o-i386)
  "_strerror$UNIX2003", referenced from:
      Iex::throwErrnoExc(std::string const&, int) in freeimage.a(IexThrowErrnoExc.o-i386)
  "_strtod$UNIX2003", referenced from:
      _png_handle_sCAL in freeimage.a(pngrutil.o-i386)
ld: symbol(s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)

_fwrite$UNIX2003ってなんだ・・・検索してみた。

FreeImage has undefined symbols for i386 for Xcode 6 beta 6 + iOS Simulator · Issue #3178

extern "C" {
    size_t fwrite$UNIX2003( const void *a, size_t b, size_t c, FILE *d )
    {
        return fwrite(a, b, c, d);
    }
    char* strerror$UNIX2003( int errnum )
    {
        return strerror(errnum);
    }
    time_t mktime$UNIX2003(struct tm * a)
    {
        return mktime(a);
    }
    double strtod$UNIX2003(const char * a, char ** b) {
        return strtod(a, b);
    }
}

上のようにダミーの関数定義を追加すればよいらしい。ofrubyのmain.mmに関数を追加したら動くようになった。

8ee9073 · ongaeshi/ofruby-ios

これでiOS8でもofrubyが動きそうだ。