not particularly good with this kind of stuff I have managed to install the Boost C++ library and this basic program works with the g++ compiler and linking to the right .dylib files.
#include <iostream>
#include <boost/filesystem.hpp>
using namespace boost;
int main()
{
filesystem::path path1("/Users/username/Documents/testfile.txt");
filesystem::remove(path1);
std::cout << "It worked" << std::endl;
return 0;
}
Now I would like to do the same, just using Xcode to build and run the program, but it doesn't work. I have done everything in this tutorial:
http://buddypanda.com/?p=10
i.e. include header and library search paths, as well as linked the .dylib files of filesystem and system under the 'Build Phases' tab.
The Build succeeds but then the program crashed with an error of EXC_BAD_ACCESS.
I can maybe provide more specifics on what goes wrong if you tell me where to look.
Thanks!
EDIT1: I am using g++-4.9 and Boost-1.58 and Xcode 6.4
Related
I'm trying to run a helloworld program which uses boost filesystem.
I'm on Windows with MinGW 8.1 and boost 1.70.
The problem is that, although everything compiles, the program doesn't run. I mean, it runs but doesn't print anything, which means the main function is not even executed:
#include <boost/filesystem.hpp>
#include <iostream>
using namespace std;
using namespace std::string_literals;
namespace fs = boost::filesystem;
int main()
{
cout << "Hello Boost!" << endl;
fs::path abHome{"C:/Users/Me"s};
fs::path jsonFile = abHome / "jsonFile.json"s;
if (!fs::exists(jsonFile)) {
cout << "Creating json file from scratch." << endl;
}
}
"Hello Boost" isn't ever printed to the console.
I've compiled with both CMake and g++ from command line to try to better understand what's going on:
g++ main.cpp -o main -L"C:/Code/boost_1_70_0/stage/lib" -lboost_filesystem-mgw81-mt-x64-1_70 -lboost_system-mgw81-mt-x64-1_70 -I"C:/Code/boost_1_70_0"
I've compiled boost for MinGW by following the guide and everything went well, in the output folder I see many different versions of each library based on the default targets (I haven't really picked them, just went with the defaults).
How can I debug the launch of main.exe to see what's causing the crash? It's been many years since I wrote C++ so I need help to get back on track! :)
The problem was, as #kenba pointed out, that the dynamic linking of the boost dlls was failing.
I erroneously thought I had linked the static version of the boost libraries.
To actually achieve that I should have used this command:
g++ main.cpp -o main -L"C:/Code/boost_1_70_0/stage/lib" -l:"libboost_filesystem-mgw81-mt-x64-1_70.a" -l:"libboost_system-mgw81-mt-x64-1_70.a" -I"C:/Code/boost_1_70_0"
instead of the one I posted in the OP.
I am on a Mac OSX and I am trying to start using the C ftdi drivers I installed using brew
brew install libftdi
That installed the library in the directory /usr/local/Cellar/libftdi/1.2 And I have the following C++ code
#include <iostream>
#include <ftdi.h>
using namespace std;
int main() {
struct ftdi_context ftdi;
ftdi_init(&ftdi);
cout << "Hello World" << endl;
return 0;
}
How should I compile this to make it work? I am including the include/ directory so the compiler can find the header file but I do not know which object file should be linked. I am trying to using the following command
g++ -I /usr/local/Cellar/libftdi/1.2/include/libftdi1/ /usr/local/Cellar/libftdi/1.2/lib/libftdi1.a test.cpp
But I am getting bad linker errors even though I have included the .a file. The lib/ directory has the following contents
cmake
libftdi1.2.2.0.dylib
libftdi1.2.dylib -> libftdi1.2.2.0.dylib
libftdi1.a
libftdi1.dylib -> libftdi1.2.dylib
pkgconfig
Is there something else I should try and link it to? Even if you are not aware of this particular driver is there something in general that I should be doing for drivers like this that I have not done?
Thanks for the help!
I'm having some troubles to get my CodeLite IDE working with Boost library.
So basically, I've got CodeLite v.6.1.1 and Boost library downloaded from sourceforge. I would love to make it actually working, but I failed to do so using the following concept:
I did create new workspace, than I did go -> Settings -> Build Settings -> Compilers (here I have two compilers, one of which is CodeLite 4.8.1 and the other one is MinGW Code::Blocks, I did select CodeLite 4.8.1. -> Advanced -> Global Paths -> and I did provide two blank lines of Include Path and Libraries Path with the directory of unpacked boost library (Windows 7): C:\boostlib\boost_1_57_0.
In this catalog (i.e.: C:\boostlib\boost_1_57_0), I have got all neccesary files, all of them are unzipped and yet I can't get it working.
Besides, I can't click on apply when I'm done with setting path to files containing boost library, all I can do is click ok but once I'm done with this I can't work with libraries from boost.
The following code isn't working:
#include <boost/lambda/lambda.hpp>
#include <iostream>
#include <iterator>
#include <algorithm>
int main()
{
using namespace boost::lambda;
// ERROR MESSAGE: boost/lambda/lambda.hpp, No such file or directory
typedef std::istream_iterator in;
std::for_each(in(std::cin), in(), std::cout << (_1 * 3) << ” ” );
return 0;
}
The message I get is:
boost/lambda/lambda.hpp: No such file or directory
Is there any chance I can get CodeLite working with boost library or should I simply switch IDE and forget about it ?
Your on the right track but need to point to the libs and include folders inside the boost directory.
I use the the http://nuwen.net/mingw.html version of mingw as STL (the guy) includes boost as part of his distribution.
So in codeLite I just have to add
C:\MinGW\lib to the libraries path
C:\MinGW\include to the include path
I am building a Makefile project in Eclipse Juno, and I have it set up so it compiles and debugs (it's using CMake, so I'm not using the internal tools). However, Eclipse obviously hasn't been informed of the right headers, as in the following code:
#include <iostream>
using namespace std;
int main ()
{
cout << "Hello world << endl;
return 0;
}
the include "iostream" and symbols "std", "cout" and "endl" are all unresolved.
How should I make Eclipse aware of these so it will stop underlining everything in red and spamming with errors?
This can be resolved by specifying the following environmental variables in Project->Properties->C++ Build->Environment.
LANG=en_US
LC_ALL=en_US
Apparently they are needed for the auto-discovery tools to work out where the includes live.
Answer gleaned from this Eclipse forum thread.
I am new to LEDA and I am working on LEDA6.3 Free Edition on OpenSuse 12.1.
As a start I tried to write a simple code "Hello LEDA world" as in the manual http://www.leda-tutorial.org/en/official/ch01s02.html.
#include <LEDA/string.h>
#include <iostream>
using leda::string;
using std::cout;
int main()
{
string msg = "Hello LEDA world!";
cout << msg << "\n";
}
The compilation phase works fine and I generated the .o file.
But they mentioned that this file needs to be linked to the LEDA library and the only library available in the Free edition is the libleda.a and libleda.so
I am trying to link using the following command:
g++ -o welcome welcome.o -L$LEDAROOT -llibleda
What I get is:
/usr/lib64/gcc/x86_64-suse-linux/4.6/../../../../x86_64-suse-linux/bin/ld: cannot find -llibleda
I was wondering if someone could help me with how to link my file with the leda library ? so I can get it to run.
Thanks all.
It is unlikely that the library file is called liblibleda.a or liblibleda.so: when the linker sees a an option of the form -l<name> it will search for a library file named lib<name>.so (for shared libraries) or lib<name>.a (for static libraries). You probably just want to use the option -lleda (unless the LEDA developers did something clever and called the library something like libeda.a so you'd use -leda).
Whether this works will also depend on the compiler options being consistent between the installation and your build.