I am new to C++ programming and trying to add a library (Yepp) to my cpp file.
I am trying to compile and it says it cannot find a header file from the external library. The external library, yeppp, has a .so file which I placed in a lib folder in the root directory.
I am building with the following command:
clang++ -O3 test.cpp -o test -L lib/ -lyeppp
Here's the error:
test.cpp:7:10: fatal error: 'yepCore.h' file not found
#include <yepCore.h>
You need to tell the compiler where to find the header file. Use the -I option.
Related
I use Ubuntu 18.04 and try to compile the example 'money.cpp' file that Gecode brings. I downloaded (gecode-release-5.1.0.tar.gz) and extract it. Then to install Gecode I do the following steps:
(1) ./configure
(2) make
I get satisfactory installation.
Then I try to compile money.cpp, like this:
$g++ money.cpp
and I get the following error:
fatal error: gecode / driver.hh: No such file or directory
#include
^ ~~~~~~~~~~~~~~~~~
I know the problem is that it does not recognize the libraries, but how can I make my .cpp or compile phase recognize them?
regards!
Alberto
You need to call g++ with the -I flag so that g++ knows where to look for the include files:
g++ -I<dir> money.cpp
<dir> is the source code directory for the files (the one with structure as seen on GitHub):
https://github.com/Gecode/gecode
See Compiling with g++:
https://courses.cs.washington.edu/courses/cse373/99au/unix/g++.html
I’m a newbie to C++ and Linux. There is this code I’m playing with that requires me to install the HElib (Homomorphic encryption library and other libraries - GMP, NTL) which I did. I want to compile the code (main.cpp) that has a header file (FHE.h) in HElib. My problem is how can I link FHE.h (in HElib folder) and main.cpp (in another folder) together so that I can compile them. I have tried some commands
g++ -I/Home/HElib/src/FHE.h main.cpp -o main
Error message
main.cpp:1:17: fatal error: FHE.h: No such file or directory
compilation terminated.
Another command line
g++ -I/Home/HElib/Src/FHE.h -I/Home/SimpleFHESum-master/SimpleFHESum-master/main.cpp -o main]
Error Message
g++: fatal error: no input files
compilation terminated.
What's wrong and how can I fix this?
The -I flag adds the following directory to the include path of the compiler. This enables you to write e.g. #include "FHE.h" even though that file is not located in the same folder as the source file you're trying to compile.
Have you tried just removing the 'FHE.h' part from your -I directive?
g++ -I/Home/HElib/src ...
I'm trying to use the following github project https://github.com/apache/parquet-cpp. I was able to build it and the .so files are available in parquet-cpp/build/latest. I copied the .so files(both of libparquet as well as libarrow which had been built) in a separate directory and wrote a simple hello world, simply importing the library as:
#include <arrow/io/file.h>
#include <parquet/api/reader.h>
#include <parquet/api/writer.h>
Now I ran
g++ -Wall test.cpp -L. -lparquet -larrow
However this throws an error as unable to find .h files of arrow/parquet. What am I doing wrong?
You forgot to include the path for the header files in the compilation instruction. You need to find directory containing parquet/api/reader.h and include it in the compilation command
g++ -Wall -I path_containing_header test.cpp -L. -lparquet -larrow
You may include several directories with multiple -I instruction.
I am trying to execute a cpp file named "palindrome.cpp" using terminal on my Macbook. This cpp file uses an external library named "libStanfordCPPLib.a" which lies under "DIRECTORY TO CPP FILE/StanfordCPPLib", also the corresponding header files of this library are in this "StanfordCPPLib" folder.
You can see the folder structure by this screenshot:
My code for compiling this source code is :
g++-4.8 -Wall -I/Users/myName/Downloads/CS106B/palindrome/StanfordCPPLib -L/Users/myName/Downloads/CS106B/palindrome/StanfordCPPLib palindrome.cpp libStanfordCPPLib.a
As I understand, -I stands for the directory path where header files exist, and -L stands for the directory path where library (.a file) exists. That's why both -I and -L are the same directory path "/Users/myName/Downloads/CS106B/palindrome/StanfordCPPLib".
However, executing this command returns an error saying :"libStanfordCPPLib.a: No such file or directory". As is shown in the screenshot:
Can anyone see why this happens? Thanks.
Try this, using -lStanfordCPPLib:
g++-4.8 -Wall -I/Users/myName/Downloads/CS106B/palindrome/StanfordCPPLib -L/Users/myName/Downloads/CS106B/palindrome/StanfordCPPLib palindrome.cpp -lStanfordCPPLib
I have a directory maths which is a library that is comprised solely of header files.
I am trying to compile my program by running the following command in my home directory:
g++ -I ../maths prog1.cpp prog2.cpp test.cpp -o et -lboost_date_time -lgsl -lgslcblas
but I get the following compilation error:
prog1.cpp:4:23: fatal error: maths/Dense: No such file or directory
compilation terminated.
prog2.cpp:6:23: fatal error: maths/Dense: No such file or directory
compilation terminated.
maths is located in the same directory(i.e. my home directory) as the .cpp files and I am running the compilation line from my home as well.
prog1.cpp and prog2.cpp have the following headers
#include<maths/Dense> on lines 4 and 6 respectively, hence I am getting the error.
how do I fix it.
You can either change your include path to -I.. or your includes to #include <Dense>
Wait, if maths is in the same directory as your source files and that is your current directory, you can either change your include path to -I. or your includes to #include "Dense"
maths is located in the same directory(i.e. my home directory) as the .cpp files
Your include path is given as -I ../maths. You need -I ./maths – or simpler, -I maths since maths is a subdirectory of the current directory, not of the parent directory. Right?
Then in your C++ file, use #include <Dense>. If you want to use #include <maths/Dense> you need to adapt the include path. However, using -I. may lead to massive problems1, I strongly advise against this.
Instead, it’s common practice to have an include subdirectory that is included. So your folder structure should preferably look as follows:
./
+ include/
| + maths/
| + Dense
|
+ your_file.cpp
Then use -I include, and in your C++ file, #include <maths/Dense>.
1) Consider what happens if you’ve got a file ./map.cpp from which you generate an executable called ./map. As soon as you use #include <map> anywhere in your code, this will try to include ./map instead of the map standard header.