C++ 从C+链接到curl+；M1 Mac上-arm64的未定义符号

我有一个在Windows和Linux上的现有项目。我最近第一次得到了一个Mac，我正试图为C++开发设置它，但是我有一个链接到CURL，我相信。 据我所见，curl通过我使用

自制安装curl

安装的自制软件支持基于M1 arm的芯片

下面是我的制作文件

SOURCES = DataDogStatsD.cpp DDEvent.cpp Helpers.cpp

lib_name = libDataDogStatsD.so.1.1.0.5

curl_include = /usr/local/include/curl
rapidjson_inc_path = /usr/local/include/rapidjson

OBJECTS = $(SOURCES:.cpp=.o)
CFLAGS = -fpic -c $(SOURCES) -Wall -g -Iinclude -std=c++11 -I/usr/include -I$(curl_include) -I$(rapidjson_inc_path)
CC = g++
LDFLAGS = -lpthread -pthread -lm -L/opt/homebrew/opt/curl/lib

.PHONY: clean

default:
    $(CC) -shared -Wl,-install_name,libDataDogStatsD.so.1 -o $(lib_name) $(OBJECTS) $(LDFLAGS)
    ln -sf $(lib_name) libDataDogStatsD.so

clean:
    rm -vf $(OBJECTS) depend $(lib_name)

depend: $(SOURCES)
    $(CC) $(CFLAGS) > depend

-include depend

当我运行make时，我得到以下信息：

g++ -fpic -c DataDogStatsD.cpp DDEvent.cpp Helpers.cpp -Wall -g -Iinclude -std=c++11 -I/usr/include -I/usr/local/include/curl -I/usr/local/include/rapidjson > depend
g++ -shared -Wl,-install_name,libDataDogStatsD.so.1 -o libDataDogStatsD.so.1.1.0.5 DataDogStatsD.o DDEvent.o Helpers.o -lpthread -pthread -lm -L/opt/homebrew/opt/curl/lib
Undefined symbols for architecture arm64:
  "_curl_easy_cleanup", referenced from:
      DataDogStatsD::event(DDEvent, bool, void (*)(bool, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >)) in DataDogStatsD.o
      DataDogStatsD::sendDDEventinthread(DDEvent, void (*)(bool, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >)) in DataDogStatsD.o
  "_curl_easy_getinfo", referenced from:
      DataDogStatsD::event(DDEvent, bool, void (*)(bool, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >)) in DataDogStatsD.o
      DataDogStatsD::sendDDEventinthread(DDEvent, void (*)(bool, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >)) in DataDogStatsD.o
  "_curl_easy_init", referenced from:
      DataDogStatsD::initCurl(DDEvent, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >*, curl_slist*, char const*) in DataDogStatsD.o
  "_curl_easy_perform", referenced from:
      DataDogStatsD::event(DDEvent, bool, void (*)(bool, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >)) in DataDogStatsD.o
      DataDogStatsD::sendDDEventinthread(DDEvent, void (*)(bool, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >)) in DataDogStatsD.o
  "_curl_easy_setopt", referenced from:
      DataDogStatsD::initCurl(DDEvent, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >*, curl_slist*, char const*) in DataDogStatsD.o
  "_curl_easy_strerror", referenced from:
      DataDogStatsD::event(DDEvent, bool, void (*)(bool, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >)) in DataDogStatsD.o
      DataDogStatsD::sendDDEventinthread(DDEvent, void (*)(bool, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >)) in DataDogStatsD.o
  "_curl_slist_append", referenced from:
      DataDogStatsD::initCurl(DDEvent, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >*, curl_slist*, char const*) in DataDogStatsD.o
  "_curl_slist_free_all", referenced from:
      DataDogStatsD::event(DDEvent, bool, void (*)(bool, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >)) in DataDogStatsD.o
      DataDogStatsD::sendDDEventinthread(DDEvent, void (*)(bool, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >)) in DataDogStatsD.o
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [default] Error 1

g++-fpic-c DataDogStatsD.cpp DDEvent.cpp Helpers.cpp-Wall-g-Iinclude-std=c++11-I/usr/include-I/usr/local/include/curl-I/usr/local/include/rapidjson>
g++-shared-Wl，-install_name，libDataDogStatsD.so.1-o libDataDogStatsD.so.1.1.0.5 DataDogStatsD.o DDEvent.o Helpers.o-lpthread-pthread-lm-L/opt/homebrew/opt/curl/lib
架构arm64的未定义符号：
“_curl_easy_cleanup”，引用自：
DataDogStatsD.o中的DataDogStatsD:：事件（DDEvent，bool，void（*）（bool，std:：_1:：basic_string））
DataDogStatsD.o中的DataDogStatsD:：senddeventinthread（DDEvent，void（*）（bool，std:：u 1:：basic_string））
“\u curl\u easy\u getinfo”，引用自：
DataDogStatsD.o中的DataDogStatsD:：事件（DDEvent，bool，void（*）（bool，std:：_1:：basic_string））
DataDogStatsD.o中的DataDogStatsD:：senddeventinthread（DDEvent，void（*）（bool，std:：u 1:：basic_string））
“\u curl\u easy\u init”，引用自：
DataDogStatsD.o中的DataDogStatsD:：initCurl（DDEvent，std:：u 1:：basic_string*，curl_slist*，char const*）
“\u curl\u easy\u perform”，引用自：
DataDogStatsD.o中的DataDogStatsD:：事件（DDEvent，bool，void（*）（bool，std:：_1:：basic_string））
DataDogStatsD.o中的DataDogStatsD:：senddeventinthread（DDEvent，void（*）（bool，std:：u 1:：basic_string））
“_curl_easy_setopt”，引用自：
DataDogStatsD.o中的DataDogStatsD:：initCurl（DDEvent，std:：u 1:：basic_string*，curl_slist*，char const*）
“\u curl\u easy\u strerror”，引用自：
DataDogStatsD.o中的DataDogStatsD:：事件（DDEvent，bool，void（*）（bool，std:：_1:：basic_string））
DataDogStatsD.o中的DataDogStatsD:：senddeventinthread（DDEvent，void（*）（bool，std:：u 1:：basic_string））
“\u curl\u slist\u append”，引用自：
DataDogStatsD.o中的DataDogStatsD:：initCurl（DDEvent，std:：u 1:：basic_string*，curl_slist*，char const*）
“\u curl\u slist\u free\u all”，引用自：
DataDogStatsD.o中的DataDogStatsD:：事件（DDEvent，bool，void（*）（bool，std:：_1:：basic_string））
DataDogStatsD.o中的DataDogStatsD:：senddeventinthread（DDEvent，void（*）（bool，std:：u 1:：basic_string））
ld:未找到架构arm64的符号
叮当声：错误：链接器命令失败，退出代码为1（使用-v查看调用）
make:**[默认值]错误1

我曾尝试将-arch设置为x86_64，作为对LDFLAGS的测试，然后它成功编译并创建了库，但我并不认为我应该在为M1构建x86_64时构建它，因此速度更快，因为它不必经过Rosetta

如果我运行

lipo-info/opt/homebrew/opt/curl/bin/curl

检查库的体系结构，我会得到以下结果：

g++ -fpic -c DataDogStatsD.cpp DDEvent.cpp Helpers.cpp -Wall -g -Iinclude -std=c++11 -I/usr/include -I/usr/local/include/curl -I/usr/local/include/rapidjson > depend
g++ -shared -Wl,-install_name,libDataDogStatsD.so.1 -o libDataDogStatsD.so.1.1.0.5 DataDogStatsD.o DDEvent.o Helpers.o -lpthread -pthread -lm -L/opt/homebrew/opt/curl/lib
Undefined symbols for architecture arm64:
  "_curl_easy_cleanup", referenced from:
      DataDogStatsD::event(DDEvent, bool, void (*)(bool, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >)) in DataDogStatsD.o
      DataDogStatsD::sendDDEventinthread(DDEvent, void (*)(bool, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >)) in DataDogStatsD.o
  "_curl_easy_getinfo", referenced from:
      DataDogStatsD::event(DDEvent, bool, void (*)(bool, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >)) in DataDogStatsD.o
      DataDogStatsD::sendDDEventinthread(DDEvent, void (*)(bool, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >)) in DataDogStatsD.o
  "_curl_easy_init", referenced from:
      DataDogStatsD::initCurl(DDEvent, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >*, curl_slist*, char const*) in DataDogStatsD.o
  "_curl_easy_perform", referenced from:
      DataDogStatsD::event(DDEvent, bool, void (*)(bool, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >)) in DataDogStatsD.o
      DataDogStatsD::sendDDEventinthread(DDEvent, void (*)(bool, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >)) in DataDogStatsD.o
  "_curl_easy_setopt", referenced from:
      DataDogStatsD::initCurl(DDEvent, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >*, curl_slist*, char const*) in DataDogStatsD.o
  "_curl_easy_strerror", referenced from:
      DataDogStatsD::event(DDEvent, bool, void (*)(bool, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >)) in DataDogStatsD.o
      DataDogStatsD::sendDDEventinthread(DDEvent, void (*)(bool, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >)) in DataDogStatsD.o
  "_curl_slist_append", referenced from:
      DataDogStatsD::initCurl(DDEvent, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >*, curl_slist*, char const*) in DataDogStatsD.o
  "_curl_slist_free_all", referenced from:
      DataDogStatsD::event(DDEvent, bool, void (*)(bool, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >)) in DataDogStatsD.o
      DataDogStatsD::sendDDEventinthread(DDEvent, void (*)(bool, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >)) in DataDogStatsD.o
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [default] Error 1

非fat文件：/opt/homebrew/opt/curl/bin/curl是体系结构：arm64

---

所以curl看起来是正确的，所以不确定为什么我会得到arm64的错误未定义符号我在makefile中没有看到任何对

curl

库的引用。要纠正此问题，您（可能）需要将

-lcurl

添加到

LDFLAGS

中

---

另外，

/opt/homebrew/opt/curl/bin/curl

是curl可执行文件，而不是库。这是（可能是）

/opt/homebrew/opt/curl/lib/libcurl。所以

谢谢，我会仔细检查，但这是一个正在工作的项目，所以如果是因为我在make文件中遗漏了一些内容，请感到有点困惑。同样，如果这就是为什么LDFLAGS中的doing-arch x86_64可以构建库的原因（不是说不是）。我假设它的卷曲度是个问题，因为这是图书馆链接到的唯一我不能回答的问题。我只是根据你的帖子上看到的来写。免责声明：我不是制造专家。你是对的，那是因为我缺少-lcurl。我想我找到了它以前工作的原因，我有-L/usr/lib64，它在搜索路径中，所以我想它总是能找到它，即使我没有明确告诉它。奇怪的是，为什么它说arm64的符号未定义，而不是说它找不到库。