I have an existing project written on C++ that I would like to compile for webassembly using emscripten. The code calls boost library:
#include <boost/program_options.hpp>
#include <iostream>
#include <string>
#include <exception>
#include <algorithm>
#include <iterator>
#include <boost/filesystem/fstream.hpp>
#include <boost/filesystem/exception.hpp>
#include <boost/filesystem/convenience.hpp>
#include <boost/thread/thread.hpp>
#include <boost/lexical_cast.hpp>
#include <boost/assign.hpp>
I have compiled the necessary parts of boost library using emscripten as static libraries and converted them from bc to a-files using emar. Now I'm trying to compile the project feeding the compiler with the precompiled libraries:
(part of Makefile)
C_OPTIONS= -O3 -DNDEBUG -g \
/home/hiisi/workspace/boost_libs/program_options/build/emscripten-1.38.38/release/link-static/threading-multi/libs/cmdline.bc.a \
/home/hiisi/workspace/boost_libs/program_options/build/emscripten-1.38.38/release/link-static/threading-multi/libs/config_file.bc.a \
/home/hiisi/workspace/boost_libs/program_options/build/emscripten-1.38.38/release/link-static/threading-multi/libs/convert.bc.a \
/home/hiisi/workspace/boost_libs/program_options/build/emscripten-1.38.38/release/link-static/threading-multi/libs/libboost_program_options.bc.a \
However make still complains on the very first occurrence of boost in the code:
main.cpp:1:10: fatal error: 'boost/program_options.hpp' file not found
#include <boost/program_options.hpp>
^~~~~~~~~~~~~~~~~~~~~~~~~~~
1 error generated.
shared:ERROR: compiler frontend failed to generate LLVM bitcode, halting
The question may sound little bit naive, but how do I correctly do this? The project compiles perfectly fine with g++, but not em++
All I had to do is to make sure that boost lib presents in emscripten include directory. In my case that was emsdk/fastcomp/emscripten/system/include/ I made a symlink to system' boost library there and everything worked like a charm.
You have to add the include directories to use boost.
That would be an argument that look like this:
... -I/home/hiisi/workspace/boost_libs/include ...
Related
I am trying to build a shared object to later use a function DoSomethingUseful() from the shared object in other projects.
It uses external libraries as well as a bunch of headers that I am using across multiple projects.
Using CMake, I created a project MySharedLib with a header file called
library.h:
#ifndef MYSHAREDLIB_LIBRARY_H
#define MYSHAREDLIB_LIBRARY_H
#include <iostream>
#include <stdio.h>
#include <stdlib.h>
#include <string>
#include <cstdio>
// own header files
#include <header1.h>
#include <header2.h>
#define PI 3.14159265
//tesseract
#include <tesseract/baseapi.h>
#include <leptonica/allheaders.h>
//openCV
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
//face detection
#include "opencv2/objdetect.hpp"
#include "opencv2/imgproc.hpp"
void DoSomethingUseul(int[] inparray);
#endif
With library.cpp as
#include "library.h"
void DoSomethingUseful(int[] inparray){...}
My CMake file is as such:
cmake_minimum_required(VERSION 3.10)
project(MYSHAREDLIB)
find_package( OpenCV REQUIRED )
set(CMAKE_CXX_STANDARD 11)
set(MY_INCLUDE_DIR ../source/)
set(MY_OPENCV_CASCADES /opencvpath/openCV34/opencv/sources/data/haarcascades/)
include_directories(${MY_INCLUDE_DIR} ${MY_OPENCV_CASCADES} /usr/include)
link_directories(${MY_INCLUDE_DIR})
add_library(MYSHAREDLIB SHARED library.cpp library.h
${MY_INCLUDE_DIR}header1.cpp
${MY_INCLUDE_DIR}header1.h
${MY_INCLUDE_DIR}header2.cpp
${MY_INCLUDE_DIR}header2.h
)
set_target_properties(MYSHAREDLIB PROPERTIES VERSION 3.10)
set_target_properties(MYSHAREDLIB PROPERTIES SOVERSION 1)
target_link_libraries(MYSHAREDLIB lept tesseract ${OpenCV_LIBS})
The *.so file is created sucessfully, i. e. using Clion, no errors are thrown and the file libMySharedLib.so is there.
However, when I want to use the function DoSomethingUseful() in another file DoSomething.cpp:
#include <iostream>
#include "library.h"
using namespace std;
int main()
{
int[2] myarray; myarray[0]=1; myarray[1] =2;
DoSomethingUseful(myarray);
return 0;
}
And
g++ -g -Wall -o DoSomething DoSomething.cpp -I ../source/ -L. libMYSHAREDLIB.so
When I execute
./DoSomething
I get:
./DoSomething: error while loading shared libraries: libMYSHAREDLIB.so: cannot open shared object file: No such file or directory
Before, I compiled without -I ../source/ yielding:
In file included from DoSomething.cpp:8:0:
library.h:19:10: fatal error: header1.h: No such file or directory
#include <header1.h>
I find many threads dealing with this issue in general, and I gathered already a lot of knowledge about shared objects from those issues, also suceeding in getting examples from various tutorials running.
However, I do not suceed with my own project.
This is just one of many questions, but I hope I can get help here and maybe also general hints. Thank you a lot for any help.
Assuming Linux (amend question if wrong). When running an executable, shared libraries are loaded from paths listed in /etc/ld.so.conf only. If you want to load from somewhere else (.) , you have to set the LD_LIBRARY_PATH environment variable, e.g. LD_LIBRARY_PATH=. ./DoSomething
This question already has answers here:
How do I link GLFW
(3 answers)
Closed 4 years ago.
I am trying to run a modified program that can be found at cpp-pointcloud.cpp. I am having difficulties getting it to build.
As it is now my file structure is:
-pointcloud.cpp
-librealsense/
-examples
-example.hpp
And I am building it with the command:
g++ -std=c++11 pointcloud.cpp -lrealsense -lopencv_core -lopencv_imgproc -lopencv_highgui -o ir
The imports of the pointcloud.cpp file are as follows:
// License: Apache 2.0. See LICENSE file in root directory.
// Copyright(c) 2015 Intel Corporation. All Rights Reserved.
#include <librealsense/rs.hpp>
#include <librealsense2/rs.hpp>
#include "librealsense/examples/example.hpp"
#include <chrono>
#include <vector>
#include <sstream>
#include <iostream>
#include <algorithm>
And they are:
#pragma once
#define GLFW_INCLUDE_GLU
#include <GLFW/glfw3.h>
#include <vector>
#include <string>
#include <sstream>
#include <iostream>
#include <algorithm>
In the example.hpp file.
My issue is that it cannot seem to find the glfw files. I get a bunch of errors like:
pointcloud.cpp:(.text+0xdf5): undefined reference to `glPopMatrix'
Which is bizarre to me as I'm confident that i've installed the GLFW3 package. And I believed that includes that use the angle brackets search for installed packages on your operating system.
I've ran this command successfully:
sudo apt-get install libglfw3 libglfw3-dev
I tried adding
#include <GLFW/glfw3.h>
to the pointcloud.cpp file but it actually gave me more errors!
I miss be misunderstanding something conceptually here, so if any of you could point me in the right direction that would be great thanks.
You have to link GLFW with pkg-config cf How do I link GLFW
$ gcc `pkg-config --cflags glfw3` -o foo foo.c `pkg-config --static --libs glfw3`
you can locate the libraries using locate or whereis ( update database before with sudo updatedb , https://unix.stackexchange.com/questions/194088/how-to-check-if-a-shared-library-is-installed ) or find ( /www.lifewire.com/uses-of-linux-command-find-2201100 ) i.e.
sudo updatedb ( may take some time ... )
locate libglfw
or
sudo find /usr/lib -name '*libglfw*'
possibly also check all dependencies required for libglfw using ldd
These are the header files and libraries
#include <iostream>
#include <algorithm>
#include <stdio.h>
#include <math.h>
#include <vector>
#include <numeric>
#include <strings.h>
#include <assert.h>
#include <dirent.h>
#include <boost/numeric/ublas/matrix.hpp>
#include <boost/numeric/ublas/io.hpp>
#include <boost/geometry.hpp>
#include <boost/geometry/geometries/point_xy.hpp>
#include <boost/geometry/geometries/polygon.hpp>
#include <boost/geometry/geometries/adapted/c_array.hpp>
#include "mail.h"
I am trying to compile this c++ file I got using
g++ -O3 -DNDEBUG -o evaluate_object evaluate_object.cpp
The compile output
evaluate_object.cpp:13:10: fatal error: 'boost/numeric/ublas/matrix.hpp' file
not found
#include <boost/numeric/ublas/matrix.hpp>
^
1 error generated.
Ps: I run on macos sierra 10.12
I have tried install boost by these ways:
sudo port install boost
brew install boost
sudo port install boost +universal
But I still got the same problem.
I would be happy to get out of this noob zone.
I am a macos newbie too.
It seems that your "boost" includes directory is not present within environment defined include directories. You might want to specify one by passing "-I" argument to g++ command, i.e.
g++ -O3 -DNDEBUG -I/usr/local/Cellar/blahblah -o evaluate_object evaluate_object.cpp
Also your code is incomplete and perhaps if you actually call some of the boost functions you might need to add some objects for linking and then you will face "undefined reference to" error. To overcome such you need to specify "-L" flag for your g++ command.
I'm trying to write a C standard library from scratch on OSX with gcc. When I try to include a header file from my library in my test program, I get the error that it isn't defined. I try to use the -nostdlib flag but I still can't include my file.
My test program:
#include <math.h>
#include <bool.h>
#include <ctype.h>
#include <string.h>
#include <io.h>
int main(){
int x = sin(0.5);
int y = pow(2,3);
int z = abs(12);
myiofunction(7);
exit(0);
}
math.h,bool.h,ctype.h,string.h, and io.h are defined in my library. What am I doing incorrectly?
EDIT:
The error message that I am getting is:
helloTest.c:10:10: fatal error: 'bool.h' file not found
Header files aren't compiled into a static library. They have to be available to both library and program.
Therefore, when compiling your program, make sure to specify the -I options to let the compiler find your library's header files.
In order for it to use your own standard library as well, you have to use the -I option to include your library:
gcc -nostdlib -I/path/to/my/headers/ ...
So if the headers for those files were located in ./include, you'd compile with:
gcc -nostdlib -I./include/ ....
Of course you need to provide the object code for these functions at some point. Then you can link them all together using ld with -lgcc to resolve any internal GCC subroutines.
GCC Linking Options: https://gcc.gnu.org/onlinedocs/gcc/Link-Options.html
You need to write :
#include "bool.h"
Check that out:
Include Syntax
If you use it won't work anyway. You have to typed as "bool.h"
and the other thing is -l option.
Check it out : https://gcc.gnu.org/onlinedocs/cpp/Search-Path.html
If you specifiy the default location : -R [PATH]
The library to include is
#include <stdbool.h>
I have a file with the following imports:
// Include standard headers
#include <stdio.h>
#include <stdlib.h>
#include <vector>
// Include GLEW
#include <GL/glew.h>
// Include GLFW
#include <glfw3.h>
GLFWwindow* window;
// Include GLM
#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include <glm/gtc/quaternion.hpp>
#include <glm/gtx/quaternion.hpp>
#include <glm/gtx/euler_angles.hpp>
#include <glm/gtx/norm.hpp>
using namespace glm;
// Include AntTweakBar
#include <AntTweakBar.h>
#include <common/shader.hpp>
#include <common/texture.hpp>
#include <common/controls.hpp>
#include <common/objloader.hpp>
#include <common/vboindexer.hpp>
#include <common/quaternion_utils.hpp> // See quaternion_utils.cpp for RotationBetweenVectors, LookAt and RotateTowards
However, when I try to compile it with
g++ -lglut -lGLU -lGL rotatetest.cpp -o hello.o
I get the following errors:
rotatetest.cpp:7:23: error: GLUT/glew.h: No such file or directory
rotatetest.cpp:10:19: error: glfw3.h: No such file or directory
rotatetest.cpp:14:23: error: glm/glm.hpp: No such file or directory
rotatetest.cpp:15:40: error: glm/gtc/matrix_transform.hpp: No such file or directory
rotatetest.cpp:16:34: error: glm/gtc/quaternion.hpp: No such file or directory
rotatetest.cpp:17:34: error: glm/gtx/quaternion.hpp: No such file or directory
rotatetest.cpp:18:36: error: glm/gtx/euler_angles.hpp: No such file or directory
rotatetest.cpp:19:28: error: glm/gtx/norm.hpp: No such file or directory
rotatetest.cpp:23:25: error: AntTweakBar.h: No such file or directory
I know this code works because a) it's from a tutorial and b) I can successfully run it when it is part of an XCode project, just not as a standalone file.
I am on Mac OS X 10.8.5. Can anyone suggest to me how I can compile this?
The include<> directives in your file ask for OpenGL-related headers in your system include directory. g++ on the command line may be using a different system include directory than XCode is.
Make sure that the extra OpenGL headers (GLFW, GLM, GLUT) are placed in your g++ installation as well.
You probably will also have to do this for the static libraries as well.