编译器标志位置-l [英] Position of compiler flag -l
问题描述
我目前正在学习OpenCL。现在,当我想编译我的程序,我得到一个错误与此命令:
g ++ -Wall -l OpenCL main。 CPP -o主要
的错误大多是未定义的引用,因为库不挂,我觉得(
但是使用这个命令一切正常:
g ++ -Wall main.cpp -o main -l OpenCL
所以我的问题是,我要做什么,在命令前使用-l标志?
(背景是:我想使用NetBeans编译我PROGRAMM,当我下添加的标志 - >属性 - >构建 - > C ++编译器 - >附加选项,就会把中的地位,在所示第一个命令)
先感谢您的帮助
这里是错误代码:
/tmp/ccmKP4oI.o:在函数`cl :: detail :: ReferenceHandler< _cl_context *> :: release(_cl_context *)'
的main.cpp :( text._ZN2cl6detail16ReferenceHandlerIP11_cl_contextE7releaseES3 _ [_ ZN2cl6detail16ReferenceHandlerIP11_cl_contextE7releaseES3 _] + 0×14):未定义的参考`clReleaseContext'
/tmp/ccmKP4oI.o:在功能`CL ::详细:: ReferenceHandler< _cl_command_queue * > ::发布(_cl_command_queue *)':
的main.cpp :( text._ZN2cl6detail16ReferenceHandlerIP17_cl_command_queueE7releaseES3 _ [_ ZN2cl6detail16ReferenceHandlerIP17_cl_command_queueE7releaseES3 _] + 0×14):未定义的参考`clReleaseCommandQueue'
/tmp/ccmKP4oI.o:在功能`CL ::平台::的getInfo(unsigned int类型,标准::字符串*)常量:
的main.cpp :( text._ZNK2cl8Platform7getInfoEjPSs [_ZNK2cl8Platform7getInfoEjPSs] + 0x22):未定义的参考`clGetPlatformInfo'
/tmp/ccmKP4oI.o:在函数`cl :: Platform :: get(std :: vector< cl :: Platform,std :: allocator< cl :: Platform> > *)':
的main.cpp :( text._ZN2cl8Platform3getEPSt6vectorIS0_SaIS0_EE [_ZN2cl8Platform3getEPSt6vectorIS0_SaIS0_EE] + 0×41):未定义的引用`clGetPlatformIDs'。
的main.cpp :( text._ZN2cl8Platform3getEPSt6vectorIS0_SaIS0_EE [_ZN2cl8Platform3getEPSt6vectorIS0_SaIS0_EE] + 0xb4。 ):未定义的引用`clGetPlatformIDs'
collect2:错误:LD返回1退出状态
g ++
的[most]参数顺序非常重要。
库应该最后(至少在源和目标文件之后)。
-l </ code>最好是 到库名称:
g ++ -Wall main.cpp -o main -lOpenCL
#^^^ glue the -l到库名
您可能还想传递 -g
(除了 -Wall
),以获得可调试的二进制。使用 gdb
调试程序。
As James Kanze 评论过,您可能想用 -ggdb $ c替换
-g
$ c>如果特别使用 gdb
。
I'm currently learning OpenCL. Now, when I want to compile my program, I get an error with this command:
g++ -Wall -l OpenCL main.cpp -o main
The errors are mostly undefined references, because the library is not linked, I think (nevertheless I will post the error code at the end).
But with this command everything works fine:
g++ -Wall main.cpp -o main -l OpenCL
So my question is, what do I have to do, to use the -l Flag in front of the command? (The Background is: I want to use Netbeans to compile my programm and when i add the flag under -> properties -> build -> C++ Compiler -> additional options, it will put in in the Position, shown in the first command)
Thanks in advance for your help
Here's the error code:
/tmp/ccmKP4oI.o: In function `cl::detail::ReferenceHandler<_cl_context*>::release(_cl_context*)':
main.cpp:(.text._ZN2cl6detail16ReferenceHandlerIP11_cl_contextE7releaseES3_[_ZN2cl6detail16ReferenceHandlerIP11_cl_contextE7releaseES3_]+0x14): undefined reference to `clReleaseContext'
/tmp/ccmKP4oI.o: In function `cl::detail::ReferenceHandler<_cl_command_queue*>::release(_cl_command_queue*)':
main.cpp:(.text._ZN2cl6detail16ReferenceHandlerIP17_cl_command_queueE7releaseES3_[_ZN2cl6detail16ReferenceHandlerIP17_cl_command_queueE7releaseES3_]+0x14): undefined reference to `clReleaseCommandQueue'
/tmp/ccmKP4oI.o: In function `cl::Platform::getInfo(unsigned int, std::string*) const':
main.cpp:(.text._ZNK2cl8Platform7getInfoEjPSs[_ZNK2cl8Platform7getInfoEjPSs]+0x22): undefined reference to `clGetPlatformInfo'
/tmp/ccmKP4oI.o: In function `cl::Platform::get(std::vector<cl::Platform, std::allocator<cl::Platform> >*)':
main.cpp:(.text._ZN2cl8Platform3getEPSt6vectorIS0_SaIS0_EE[_ZN2cl8Platform3getEPSt6vectorIS0_SaIS0_EE]+0x41): undefined reference to `clGetPlatformIDs'
main.cpp:(.text._ZN2cl8Platform3getEPSt6vectorIS0_SaIS0_EE[_ZN2cl8Platform3getEPSt6vectorIS0_SaIS0_EE]+0xb4): undefined reference to `clGetPlatformIDs'
collect2: error: ld returned 1 exit status
Order of [most] arguments to g++
is very important.
Libraries should go last (at least after source and object files). You can't really change that.
The -l
should preferably be glued to the library name:
g++ -Wall main.cpp -o main -lOpenCL
# ^^^ glue the -l to the library name
You probably want to also pass -g
(in addition of -Wall
) to the compiler to get a debuggable binary. Use the gdb
debugger.
As James Kanze commented, you might want to replace -g
with -ggdb
if using specifically gdb
.
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