Based on this tutorial:
http://syskall.com/how-to-roll-out-your-own-javascript-api-with/index.html/
I am trying to compile a C++ program on a mac, however the includes in my C++ file are not being found. I have the following directory structure:
myProj/
|-- deps/ # third party code
| `-- v8
`-- src/
`-- myProj.cpp
in the myProj.cpp, I have several includes:
#include <include/v8.h>
so when i go to compile, I use the following:
g++ src/jsnotify.cpp -Ideps/v8/include
the deps/v8/include directory clearly has v8.h, but it still shows up as not found. is -I the correct flag for mac? I am also having trouble in linking:
g++ src/jsnotify.cpp -Ideps/v8/ -Ldeps/v8/ -lv8 -lpthread -v
the -lv8 causes:
ld: library not found for -lv8
clang: error: linker command failed with exit code 1
Look at exactly what you're telling the compiler:
#include <include/v8.h>
"open the file "include/v8.h"
g++ src/jsnotify.cpp -Ideps/v8/include
"When trying to find files to include, search in deps/v8/include"
So, the obvious question: does deps/v8/include contain include/v8.h? In other words, do you have the file deps/v8/include/include/v8.h?
As you have it, the pre-processor is trying to resolve #include <include/v8.h> to deps/v8/include/include/v8.h.
Change your include to be:
#include <v8.h>
Or change your compiler command line to:
g++ src/jsnotify.cpp -Ideps/v8
Either option is likely to work - but if v8.h also specifies additional include files specified by prepending the "include" path (e.g. #include <include/foo.h>) then the second option is more likely to work.
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 stuck in a very simple problem: I cannot manage to make work my simple code example in C++.
I want to include the "curl" library but when I compile with the command:
g++ -o myprog.out myprog.cpp -L/curl/include/ -lcurl
I get the following error message:
myprog.cpp:3:71: fatal error: /curl/include/curl/curl.h: No such file
or directory
My folder contains:
myprog.cpp (the file I want to compile)
curl -> include -> curl -> curl.h (path in which the curl.h file is located).
My headers file are configured in this way:
include<iostream>
include<string>
include<curl.h>
What I'm doing wrong? It's probably a very simple problem but it's driving me crazy :-/
Change #include <curl.h> to #include <curl/curl.h>.
Change -L/curl/include/ to -I/curl/include.
Add -L/curl/lib -Wl,-rpath=/curl/lib (or whatever the path to curl built libraries).
I am trying to compile the following code which has the headers:
#include <SDL2/SDL.h>
#include <SDL2_image/SDL_image.h>
However after running the following makefile:
g++ -std=c++11 src/main.cpp -lSDL2 -lSDL2_image
I get the following error:
fatal error: SDL2_image/SDL_image.h: No such file or directory
#include <SDL2_image/SDL_image.h>
Any suggestions? Not entirely sure about my installation of SDL_image. I am running this on Ubuntu.
This problem can be solved through installing libsdl2-image-dev package:
apt install libsdl2-image-dev
Run apt-file search SDL_image.h
The result will tell you the location of the include file.
For instance, /usr/include/SDL2/SDL_image.h was returned.
So, when you want to include SDL_image.h, write everything after the include/ in between < >.
Thus, includes should look like the following:
#include <SDL2/SDL.h>
#include <SDL2/SDL_image.h>
See the question's comments for the original discussion regarding this solution.
From SDL documentation, it says that add 'lSDL_image' to the end of the compile line.
cc -o myprogram mysource.o `sdl-config --libs` -lSDL_image
or
gcc -o myprogram mysource.c `sdl-config --libs` -lSDL_image
Here is the reference -> https://www.libsdl.org/projects/docs/SDL_image/SDL_image.html
Section 2.2 Compiling.
So for SDL2, you just need to change 'lSDL_image' to 'lSDL2_image'.
For Windows + SDL2-2.0.8 + SDL_image-2.0.4 + Codeblocks you've got the add both Runtime Binaries and Development Libraries to the compiler and linker. Or else, you'll get the error SDL2_image not found, even with having the dll in your program's directory, this occurs. Hopefully others find this helpful; I had to figure it out myself. Example: If your resources are separate, you'll be adding the two plus your standard SDL2 paths to your compiler and linker. Warning: SDL2_image.h has it's headers assuming that the headers are in the same folder as the SDL2 framework. If you get errors about the image header, include the sub-folder SDL2 from SDL framework in the path and then you should be including SDL2 in the program as: include <SDL.h> rather than include <SDL2/SDL.h>.
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.
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.