g ++无法链接curl lib文件 [英] g++ can't link curl lib files

问题描述

获取g ++链接curl lib文件时遇到一些问题.我正在将Visual Studio 2017与linux dev插件和Ubuntu Server 17.04一起使用.

curl-config --libs给出了-Lcurl的输出，我尝试将其添加到Project settings > Linker > Command Line > Additional options中的链接器选项中.我还将--cflags输出添加到了编译选项.这不能解决问题.

然后，我尝试了网站上的源代码，并使用了make和make install. curl-config --libs给了我-L/usr/local/lib -lcurl的不同输出.我更改了链接器中的选项，但仍然无法正常工作.

链接器输出显示许多未定义的引用"，然后显示curl方法.我的cpp文件中有#include <curl/curl.h>.

有什么想法吗?
谢谢

解决方案

对于默认安装，您将使用-lcurl将curl库指定为gcc，如curl-config --libs所报告.并在VCLinux生成的gcc命令行中传递此代码，请将curl添加到 Linker /<下的 Additional 库依赖项行中VS项目属性中的em> Input .请注意，您仅输入 curl ，VCLinux提供了-l，gcc链接器将其扩展为实际的文件名libcurl.a(如果要链接共享库，则为libcurl.so). /p>

通常不需要指定库搜索路径，因为/usr/lib等会自动出现在库搜索路径上.例如，在Debian 9上，libcurl.a位于/usr/lib/i386-linux-gnu中.但是，如果在非标准位置安装curl，请在 Linker / General 下将路径添加到其他库目录.如果要从Linux发行版安装curl，请记住也要安装开发文件.在Debian上，这是软件包libcurl4-gnutls-dev.

curl与pkg-config兼容，因此，除了直接输入路径和库名称之外，您还可以在 C ++ /所有选项/中指定%24(pkg-config --cflags libcurl) 链接器/所有选项/其他选项中的其他选项和%24(pkg-config --libs libcurl). 请注意，%24是编码的$，因为否则Visual Studio会尝试(失败)将字符串解释为宏.

I'm having some issues with getting g++ to link the curl lib files. I'm using Visual Studio 2017 with the linux dev plugin and Ubuntu Server 17.04.

curl-config --libs gave an output of -Lcurl which I tried adding to the linker options in Project settings > Linker > Command Line > Additional options. I also added the --cflags output to the compile options. This didn't fix the issue.

Then I tried the source from the website and used make and make install. curl-config --libs gave me a different output of -L/usr/local/lib -lcurl. I changed the options in the linker and this still didn't work.

The linker output says lots of "undefined reference to " and then the curl methods. I have #include <curl/curl.h> in the cpp file.

Any ideas?
Thanks

解决方案

With a default installion you will specify the curl library to gcc with -lcurl, as reported by curl-config --libs. And to pass this on the gcc command line generated by VCLinux, add curl to the Additional Library Dependencies line under Linker / Input in the VS project properties. Note that you enter just curl, VCLinux supplies the -l and the gcc linker expands it to the actual filename of libcurl.a (or libcurl.so if you're linking a shared library).

You do not normally have to specify the library search path since /usr/lib etc. are automatically on the library search path. On Debian 9 for example, libcurl.a is in /usr/lib/i386-linux-gnu. But if you install curl somewhere non-standard, add the path to Additional Library Directories under Linker / General. If you are installing curl from your Linux distribution, remember to install the development files as well; on Debian this is the package libcurl4-gnutls-dev .

curl is compatible with pkg-config so, as an alternative to entering the paths and library names directly, you can specify %24(pkg-config --cflags libcurl) in C++ / All Options / Additional Options and %24(pkg-config --libs libcurl) in Linker / All Options / Additional Options. Note that %24 is an encoded $ because otherwise Visual Studio tries (and fails) to interpret the string as a macro.

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