I have installed Clang by using apt-get in Ubuntu, and I can successfully compile C files using it. However, I have no idea how to compile C++ through it. What do I need to do to compile C++?
命令clang
用于 C,命令clang++
用于 C++。
I do not know why there is no answer directly addressing the problem. When you want to compile C++ program, it is best to use clang++
. For example, the following works for me:
clang++ -Wall -std=c++11 test.cc -o test
If compiled correctly, it will produce the executable file test
, and you can run the file by using ./test
.
Or you can just use clang++ test.cc
to compile the program. It will produce a default executable file named a.out
. Use ./a.out
to run the file.
The whole process is a lot like g++ if you are familiar with g++. See this post to check which warnings are included with -Wall
option. This page shows a list of diagnostic flags supported by Clang.
A note on using clang -x c++
: Kim Gräsman says that you can also use clang -x c++
to compile cpp programs, but that may not be true. For example, I am having a simple program below:
#include <iostream>
#include <vector>
int main() {
/* std::vector<int> v = {1, 2, 3, 4, 5}; */
std::vector<int> v(10, 5);
int sum = 0;
for (int i = 0; i < v.size(); i++){
sum += v[i]*2;
}
std::cout << "sum is " << sum << std::endl;
return 0;
}
clang++ test.cc -o test
will compile successfully, but clang -x c++
will not, showing a lot undefined references errors. So I guess they are not exactly equivalent. It is best to use clang++
instead of clang -x c++
when compiling c++ programs to avoid extra troubles.
Also, for posterity -- Clang (like GCC) accepts the -x
switch to set the language of the input files, for example,
$ clang -x c++ some_random_file.txt
This mailing list thread explains the difference between clang
and clang++
well: Difference between clang and clang++
I've had a similar problem when building Clang from source (but not with sudo apt-get install
. This might depend on the version of Ubuntu which you're running).
It might be worth checking if clang++
can find the correct locations of your C++ libraries:
Compare the results of g++ -v <filename.cpp>
and clang++ -v <filename.cpp>
, under "#include < ... > search starts here:".
Solution 1:
clang++ your.cpp
Solution 2:
clang your.cpp -lstdc++
Solution 3:
clang -x c++ your.cpp
Open a Terminal window and navigate to your project directory. Run these sets of commands, depending on which compiler you have installed:
To compile multiple C++ files using clang++:
$ clang++ *.cpp
$ ./a.out
To compile multiple C++ files using g++:
$ g++ -c *.cpp
$ g++ -o temp.exe *.o
$ ./temp.exe
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