针对iOS进行编译时出现Qt Creator Tesseract链接器错误

问：

当我尝试构建我的iOS应用程序时，我在下面收到链接器错误。 将C++标准库设置为“libstdc++”可能会修复它，但我不确定如何在QT创建器中做到这一点。

Undefined symbols for architecture armv7:
  "tesseract::TessBaseAPI::End()", referenced from:
      Ocr::~Ocr() in ocr.o
  "tesseract::TessBaseAPI::SetImage(Pix const*)", referenced from:
      Ocr::recognize(char const*) in ocr.o
  "tesseract::TessBaseAPI::GetUTF8Text()", referenced from:
      Ocr::recognize(char const*) in ocr.o
  "_pixRead", referenced from:
      Ocr::recognize(char const*) in ocr.o
  "_pixDestroy", referenced from:
      Ocr::recognize(char const*) in ocr.o
  "tesseract::TessBaseAPI::TessBaseAPI()", referenced from:
      Ocr::Ocr(char const*) in ocr.o
  "tesseract::TessBaseAPI::Init(char const*, char const*, tesseract::OcrEngineMode, char**, int, GenericVector<STRING> const*, GenericVector<STRING> const*, bool)", referenced from:
      Ocr::Ocr(char const*) in ocr.o
ld: symbol(s) not found for architecture armv7
clang: error: linker command failed with exit code 1 (use -v to see invocation)

.pro 文件的相关部分

QMAKE_CXXFLAGS = -stdlib=libstdc++

macx: LIBS += -L$$PWD/TesseractOCR/lib/ -llept

INCLUDEPATH += $$PWD/TesseractOCR/include
DEPENDPATH += $$PWD/TesseractOCR/include

macx: PRE_TARGETDEPS += $$PWD/TesseractOCR/lib/liblept.a

macx: LIBS += -L$$PWD/TesseractOCR/lib/ -ltesseract_all

INCLUDEPATH += $$PWD/TesseractOCR/include
DEPENDPATH += $$PWD/TesseractOCR/include

macx: PRE_TARGETDEPS += $$PWD/TesseractOCR/lib/libtesseract_all.a