googletest 架构 x86_64 错误的未定义符号 [英] googletest Undefined symbols for architecture x86_64 error

问题描述

让 GTEST_DIR 成为存储 googletest 目录路径的环境变量.(我从 googletest 的 github repo 克隆了 googletest-master.)

Let GTEST_DIR be the environment variable storing the path to the googletest directory. (I cloned googletest-master from googletest's github repo.)

我 cd'ed 到 $GTEST_DIR，做了一个 mkdir build &&cd build，然后执行以下命令:

I cd'ed into $GTEST_DIR, did a mkdir build && cd build, then executed the following command :

cmake .. -DCMAKE_C_COMPILER=$GNU-6.0.0/bin/gcc-6.0.0 -DCMAKE_CXX_COMPILER=$GNU-6.0.0/bin/g++-6.0.0

GNU-6.0.0 是我的 gnu 安装路径.这在 $GTEST_DIR/build 内生成了一个 Makefile，我对其进行了如下调整:我已添加

where GNU-6.0.0 is the path to my gnu install. This generated a Makefile inside $GTEST_DIR/build that I tweaked as follows : I've added

CC = $GNU-6.0.0/bin/gcc-6.0.0
CXX = $GNU-6.0.0/bin/g++-6.0.0

在开始时，要确保将使用的 c 和 c++ 编译器将是我想要使用的那些.然后我运行 make，它在 $GTEST_DIR/build 中生成了存档文件 libgtest.a 和 libgtest_main.a.

at its beginning, to be sure that the c and c++ compilers that will be used will be those I want to be used. Then I ran make which produced archive files libgtest.a and libgtest_main.a inside $GTEST_DIR/build.

下一步:在同一个文件夹中，我放置了一个主测试源文件 main.cpp 包含:

Next step : in a same folder I put a main test source file main.cpp containg :

#include "path/to/gtest.h"

int main(int argc, char* argv[])
{
    ::testing::InitGoogleTest(&argc,argv);
    return RUN_ALL_TESTS();
}

和一个虚拟测试 dummy_test.cpp 包含:

and a dummy test dummy_test.cpp containing :

#include "path/to/gtest.h"

TEST(dummy_test, test1)
{
    EXPECT_EQ(1,1);
}

和一个 Makefile 包含:

CC = gcc-6.0.0
CXX = g++-6.0.0

CPPFLAGS += -isystem $(GTEST_DIR)/include
LDFLAGS := -L/usr/lib -lpthread -L$(GTEST_DIR)/build -lgtest

all :
    $(CXX) -o cpptests $(CPPFLAGS) ./main.cpp ./dummy_test.cpp $(LDFLAGS)

clean :
    rm -rf ./cpptests

运行 make 我有这个输出:

Running make I have this output :

Undefined symbols for architecture x86_64:
  "std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::end() const", referenced from:
      testing::internal::XmlUnitTestResultPrinter::RemoveInvalidXmlCharacters(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in libgtest.a(gtest-all.cc.o)
  "std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::data() const", referenced from:
      testing::internal::PrintStringTo(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::basic_ostream<char, std::char_traits<char> >*) in libgtest.a(gtest-all.cc.o)
      __gnu_cxx::__enable_if<std::__is_char<char>::__value, bool>::__type std::operator==<char>(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in libgtest.a(gtest-all.cc.o)
  "std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::find(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned long) const", referenced from:
      bool testing::(anonymous namespace)::IsSubstringPred<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in libgtest.a(gtest-all.cc.o)
  "std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::find(char, unsigned long) const", referenced from:
      testing::internal::SplitString(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, char, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in libgtest.a(gtest-all.cc.o)
      testing::internal::FormatDeathTestOutput(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in libgtest.a(gtest-all.cc.o)
  "std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::size() const", referenced from:
      testing::internal::(anonymous namespace)::SplitEscapedString(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in libgtest.a(gtest-all.cc.o)

...

      ...
ld: symbol(s) not found for architecture x86_64
collect2: error: ld returned 1 exit status
make: *** [all] Error 1

整个输出在 这个片段中，而 nm libgtest 的输出.a 在这个片段中.

The entire output is in this snippet while the output of nm libgtest.a is in this snippet.

精度:我在mac os x 10.10.5下.由于我想继续工作，开发代码并对其进行测试，而 gcc/g++ 6.0.0 的上述错误已解决，我尝试切换到另一个编译器:clang，我说我完全没有错误.

Precision : I am under mac os x 10.10.5. As I want to continue working, developping code and testing it, while the aforementionned error with gcc/g++ 6.0.0 is solved, I tried to switch to another compiler : clang, and I remarked that I had no error at all with it.

Remark libgtest.a 最初(即在我问这个问题之前)用 clang 错误地"构建并用于遇到错误时使用 g++-6.1.0 进行测试，这就是我决定使用 g++-6.1.0 重建 libgtest.a 的原因，以为它会解决问题，但它没有，这导致我在这里发帖.

Remark libgtest.a was initially (that is, before I asked this question) built "by error" with clang and used in tests with g++-6.1.0 when I encountered the error, that's why I decided to rebuild libgtest.a with g++-6.1.0, thinking that it would solve the problem, but it didn't, which led me to post here.

推荐答案

问题似乎是由于一些链接问题.您是否正确使用了链接器标志.对于gtest，我们需要用-lgtest编译，链接器才能正确链接.同样，我们需要为我们链接的所有可能的库提供标志.

The problem seems to be due to some linking issues. Have you used the linker flags correctly. For gtest, we need to compile with -lgtest and the linker can link it correctly. Similarly, we need to have the flags for all possible libraries that we are linking against.

代码

TEST(dummy_test, test1) {EXPECT_EQ(1,1);}

TEST(dummy_test, test1) { EXPECT_EQ(1,1); }

int main(int argc, char **argv) {::testing::InitGoogleTest(&argc, argv);返回 RUN_ALL_TESTS();}

int main(int argc, char **argv) { ::testing::InitGoogleTest(&argc, argv); return RUN_ALL_TESTS(); }

用命令完美地为我编译

clang++ -std=c++11 main.cpp -lgtest

clang++ -std=c++11 main.cpp -lgtest

我可以毫无问题地运行单个测试.

and I could run the single test without an issue.

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