我有一个试图在使用fftw函数的Visual Studio Code调试器中运行的程序。用以下命令编译]
g++ dimer.cpp -std=c++11 -lfftw3
在计算机上的终端机上,没有抱怨未定义的引用。但是,在生成launch.json文件之后,我的程序抱怨fftw库函数和-std=c++14
编译器标志。
我相信它只需要-std=c++11
和-lfftw3
的额外标志使Visual Studio Code中的调试器正常工作。我正在使用Microsoft的C / C ++扩展和Code Runner扩展。
我正在尝试将Mathematica的代码文档转换为c ++。
下面是我从调试器中得到的错误。
Executing task: /usr/bin/g++ -g /home/msammartino/Documents/twochain/dimer.cpp -o /home/msammartino/Documents/twochain/dimer <
In file included from /usr/include/armadillo:54:0,
from /home/msammartino/Documents/twochain/dimer.cpp:6:
/usr/include/armadillo_bits/compiler_setup.hpp:530:108: note: #pragma message: NOTE: suggest to enable C++14 mode for faster code; add -std=c++14 to compiler flags
#pragma message ("NOTE: suggest to enable C++14 mode for faster code; add -std=c++14 to compiler flags")
^
/tmp/ccgb7Xsv.o: In function `r2r_dsine_fftw_forward_dimer(int, double*, double*, Eigen::Matrix<double, 2, 2, 0, 2, 2> (&) [2048], Eigen::Matrix<double, 2, 2, 0, 2, 2> (&) [2048])':
/home/msammartino/Documents/twochain/dimer.cpp:99: undefined reference to `fftw_plan_r2r_1d'
/home/msammartino/Documents/twochain/dimer.cpp:100: undefined reference to `fftw_plan_r2r_1d'
/home/msammartino/Documents/twochain/dimer.cpp:101: undefined reference to `fftw_plan_r2r_1d'
/home/msammartino/Documents/twochain/dimer.cpp:102: undefined reference to `fftw_plan_r2r_1d'
/home/msammartino/Documents/twochain/dimer.cpp:103: undefined reference to `fftw_execute'
/home/msammartino/Documents/twochain/dimer.cpp:104: undefined reference to `fftw_execute'
/home/msammartino/Documents/twochain/dimer.cpp:105: undefined reference to `fftw_execute'
/home/msammartino/Documents/twochain/dimer.cpp:106: undefined reference to `fftw_execute'
/tmp/ccgb7Xsv.o: In function `r2r_dsine_fftw_backward_dimer(int, double*, double*, Eigen::Matrix<double, 2, 2, 0, 2, 2> (&) [2048], Eigen::Matrix<double, 2, 2, 0, 2, 2> (&) [2048])':
/home/msammartino/Documents/twochain/dimer.cpp:166: undefined reference to `fftw_plan_r2r_1d'
/home/msammartino/Documents/twochain/dimer.cpp:167: undefined reference to `fftw_plan_r2r_1d'
/home/msammartino/Documents/twochain/dimer.cpp:168: undefined reference to `fftw_plan_r2r_1d'
/home/msammartino/Documents/twochain/dimer.cpp:169: undefined reference to `fftw_plan_r2r_1d'
/home/msammartino/Documents/twochain/dimer.cpp:170: undefined reference to `fftw_execute'
/home/msammartino/Documents/twochain/dimer.cpp:171: undefined reference to `fftw_execute'
/home/msammartino/Documents/twochain/dimer.cpp:172: undefined reference to `fftw_execute'
/home/msammartino/Documents/twochain/dimer.cpp:173: undefined reference to `fftw_execute'
collect2: error: ld returned 1 exit status
The terminal process terminated with exit code: 1
Terminal will be reused by tasks, press any key to close it.
请让我知道我问这个问题的方式有什么问题。
最简单的选择是在任务配置中将它们作为args
传递:
{
"label": "build-all",
"type": "shell",
"args": [
"-std=c++11",
"-lfftw3",
"-L",
"/path/to/libs",
"/path/to/file.cpp"
],
"command": "g++",
},
更易于维护,可共享的选项是create a Makefile并将它们全部设置在此处:
# Specify compiler to be used
CXX = g++
CXXFLAGS += -g -std=c++11 -fPIC -march=x86-64
# Specify paths to headers
INCLUDES += -I include
# Specify paths to the libraries
LDFLAGS += -L /path/to/libs
# Specify the link libraries
LLIBS += -lfftw3
...
$(OBJ_DIR)/%.o: $(SRC_DIR)/%.cpp $(OBJ_DIR)
$(CXX) -c $(CXXFLAGS) $(INCLUDES) $< -o $@
$(OBJ_DIR)/$(PROGRAM): $(OBJS)
$(CXX) $(LDFLAGS) $^ $(LLIBS) -o $@
然后在您的任务配置中,只需调用make
:
{
"label": "build-all",
"type": "shell",
"options": {
"cwd": "${workspaceFolder}",
"env": {
...
}
},
"command": "make -f Makefile.x86_64",
}
如果具有依赖于环境的路径,则可以在Makefile中指定一个变量(例如MY_LIBS
,然后在任务配置的env
块中将其设置(例如"MY_LIBS": "/path/to/libs"
)。
Makefile选项的优点是: