Trying to compile clang API project using g++ - c++

I have just downloaded llvm and clang with svn, built it just like on the official site described and want to use the clang API. I have an example, which won't to be compiled=(
#include <iostream>
#include <clang-c/Index.h>
int main (int argc, char** argv)
{
CXIndex index = clang_createIndex (
false, // excludeDeclarationFromPCH
true // displayDiagnostics
);
CXTranslationUnit unit = clang_parseTranslationUnit (
index, // CIdx
"main.cpp", // source_filename
argv + 1 , // command_line_args
argc - 1 , // num_command_line_args
0, // unsave_files
0, // num_unsaved_files
CXTranslationUnit_None // options
);
if (unit != 0 )
std::cout << "Translation unit successfully created" << std::endl;
else
std::cout << "Translation unit was not created" << std::endl;
clang_disposeTranslationUnit(unit);
clang_disposeIndex(index);
}
Command line looks like this:
g++ main.cpp -I/home/<user>/llvm/tools/clang/include
-L/home/<user>/build/Debug+Asserts/lib/ -llibclang -o main
UPDATE:
The error:
/usr/bin/ld: cannot find -llibclang
But libclang is in the /home//build/Debug+Asserts/lib/ directory.
Also tried using -llibclang.so except the llibclang - no matter=( ld says that it can not find the lib.
Anything helps, thank you!

Related

Unable to initialise sdl2

Im trying to check if sdl is properly installed on my Ubuntu 20.04 and its not.
Running all on 64bit type.
This is my code:
#include <iostream>
#include <SDL2/SDL.h>
#include <SDL2/SDL_image.h>
#include <SDL2/SDL_timer.h>
bool initSDL()
{
if (SDL_Init(SDL_INIT_EVERYTHING) != 0)
{
std::cout << "Failed to init sdl: " << SDL_GetError() << std::endl;
return false;
}
if (IMG_Init(IMG_INIT_PNG) != IMG_INIT_PNG)
{
std::cout << "Failed to init sdl_image: " << IMG_GetError() << std::endl;
return false;
}
return true;
}
int main(int argc, char *argv[])
{
std::cout << "Code Starting..." << std::endl;
initSDL();
int winX = 900, winY = 600;
std::cout << "Code Exited Properly." << std::endl;
return 0;
}
And this is my output:
Code Starting...
Failed to init sdl: No available video device
Code Exited Properly.
Im running my code with this commands:
gcc -c src/*.cpp -I include -m64 -lstdc++ -std=c++11
gcc *.o -o out/main -lSDL2main -lSDL2 -lSDL2_image -m64 -lstdc++ -std=c++11
./out/main
My code strucure is this way:
Main directory 'sdl_hello_world'
->src -> contains 'main.cpp'
->out -> contains compiled 'main'
Some methods i tried was:
export DISPLAY=:0
export SDL_VIDEODRIVER=x11
So how do i fix this ?
EDIT: I also followed this tutorial (https://www.youtube.com/watch?v=P3_xhDIP7bc&list=PLvv0ScY6vfd-p1gSnbQhY7vMe2rng0IL0&ab_channel=MikeShah), and still it gave the same error. So i guess the problem is in some computer setting.
EDIT: SOLVED:
i followed almost all tutorials and fix methods on the internet to solve my issue which uses gcc in linux. Some solutions on stack overflow seemed to prefer to compile the source code on their own computer WHICH WORKED.
So im pretty sure the way ubuntu installs it on my computer/ idk im new to using sdl. Updating this as might come handy to anyone else.
Still curious, is there a chance i did something wrong, or could this be considered a bug ?
EDIT: followed this btw https://wiki.libsdl.org/Installation

Using the Argo Command line parser: Unknown option is not returned when option is behind a exsiting option

Using this very nice Commandline parser Argo (Header only C++ library) I've encountered a small issue.
See : https://github.com/phforest/Argo
Argo returns : 'Error: Unknown option' when a option in not found, but not when the argument is behind a know argument.
Compiling the code below: (inc is location of the argo header)
c++ test.cpp -I inc --std=c++11
#include <iostream>
int main(int argc, char **argv)
{
argo::Configuration pcnfg;
std::vector<std::string> input_texts;
pcnfg.program.name = { "wow", "EyeOnText WoWoolConsole" };
pcnfg.program.version = { 1, 1, 1 };
argo::Arguments args(pcnfg);
args.add(argo::handler::Option("input-text", "i", input_texts).help("Input text to process."));
const auto result = args.parse(argc, argv);
switch (result.status)
{
case argo::ReturnCode::Error: std::cerr << "Error: " << result.message << std::endl; return 1;
case argo::ReturnCode::SuccessAndAbort: return 0;
default: break;
}
for ( auto const & input : input_texts )
{
std::cout << "- " << input << std::endl;
}
return 0;
}
run:
./a.out --other -i "test"
Error: Unknown option '--other'
Which is ok
run:
./a.out -i "test" --other
- test
- --other
--other should not be in the input list.
(Disclaimer: I'm the developer of the library)
I think this is solved in more recent versions. At least, using the provided code, I get the expected output (twice an 'Unknown option' error). If it's not solved, we can take it up using the bug tracker at https://gitlab.com/dgrine/Argo/issues

How to run gdcm examples in ubuntu?

I am trying to run this simple example in GDCM. I have installed the library c++ version and the installation works perfectly fine but I am not able to figure out how to compile and run a example.
#include "gdcmReader.h"
#include "gdcmWriter.h"
#include "gdcmAttribute.h"
#include <iostream>
int main(int argc, char *argv[])
{
if( argc < 3 )
{
std::cerr << argv[0] << " input.dcm output.dcm" << std::endl;
return 1;
}
const char *filename = argv[1];
const char *outfilename = argv[2];
// Instanciate the reader:
gdcm::Reader reader;
reader.SetFileName( filename );
if( !reader.Read() )
{
std::cerr << "Could not read: " << filename << std::endl;
return 1;
}
// If we reach here, we know for sure only 1 thing:
// It is a valid DICOM file (potentially an old ACR-NEMA 1.0/2.0 file)
// (Maybe, it's NOT a Dicom image -could be a DICOMDIR, a RTSTRUCT, etc-)
// The output of gdcm::Reader is a gdcm::File
gdcm::File &file = reader.GetFile();
// the dataset is the the set of element we are interested in:
gdcm::DataSet &ds = file.GetDataSet();
// Contruct a static(*) type for Image Comments :
gdcm::Attribute<0x0020,0x4000> imagecomments;
imagecomments.SetValue( "Hello, World !" );
// Now replace the Image Comments from the dataset with our:
ds.Replace( imagecomments.GetAsDataElement() );
// Write the modified DataSet back to disk
gdcm::Writer writer;
writer.CheckFileMetaInformationOff(); // Do not attempt to reconstruct the file meta to preserve the file
// as close to the original as possible.
writer.SetFileName( outfilename );
writer.SetFile( file );
if( !writer.Write() )
{
std::cerr << "Could not write: " << outfilename << std::endl;
return 1;
}
return 0;
}
/*
* (*) static type, means that extra DICOM information VR & VM are computed at compilation time.
* The compiler is deducing those values from the template arguments of the class.
*/
It has a few header files that it is looking for namely gdcmreader, gdcmwriter and I want to figure out the compiler flags to use to be able to run this file.
I am doing g++ a.cpp -lgdcmCommon -lgdcmDICT but that gives me the error
a.cpp:18:24: fatal error: gdcmReader.h: No such file or directory
compilation terminated.
Can you please help me out? I have searched everywhere but I can't seem to figure out how to run this file.
When using files that are in different locations of your "normal" files you must instruct the compiler and the linker how to find them.
Your code has a #include <someFile.h> command.
The <> usage means "in other path". The compiler already knows common "other paths" as for "stdio" for common libraries.
In case of "not normal", you can tell g++ where to find the headers by adding -Imydir to the command line (replace 'mydir' with the proper path)
For the libraries, static (.a) or dynamic (.so) the same history stands.
The -Lmydir tells g++ where to look for libraries.
Your command line may look like
g++ a.cpp -I/usr/include -L/usr/local/lib -lgdcmCommon -lgdcmDICT
You did not tell how did you install gdcm library, I assume that using apt system. There are two types of libraries, "normal" and "developer" ones. To be able to compile your own software, you need the latter. So, for example in Ubuntu 16.04, type apt-get install libgdcm2-dev. Then all necessary headers will be installed in /usr/include/gdcm-2.6.

Linker error when compiling a program that uses spidermonkey

I've been trying to learn spidermonkey and so have written the following code, adapted from this guide and while the program compiles properly, I get the following error during linking:
/usr/bin/ld: cannot open linker script file symverscript: No such file or directory
I'm using 64-bit Ubuntu 13.10, and here is the code (seems irrelevant to the problem, but can't hurt)
#include <jsapi.h>
#include <iostream>
#include <string>
int main()
{
std::string script = "var x = 10;x*x;";
jsval rval;
JSRuntime* runtime = 0;
JSContext* context = 0;
JSObject* globalob = 0;
if((!(runtime = JS_NewRuntime(1024L*1024L, JS_NO_HELPER_THREADS)))||
(!(context = JS_NewContext(runtime, 8192)))||
(!(globalob = JS_NewObject(context, NULL, NULL, NULL))))
{
return 1;
}
if(!JS_InitStandardClasses(context, globalob))
{
return 1;
}
if(!JS_EvaluateScript(context,globalob,script.data(),script.length(),"script",1,&rval))
{
return 1;
}
std::cout << JSVAL_TO_INT(rval) << "\n";
JS_DestroyContext(context);
JS_DestroyRuntime(runtime);
JS_ShutDown();
return 0;
}
compiled with the command
g++ main.cpp -o out $(js24-config --cflags --libs | tr "\n" " ")
Try to write this command instead,
g++ main.cpp -o main -I/usr/local/include/js/ -L/usr/local/lib/ -lmozjs1.8.5
regarding the path I wrote above, you must write your own path which include the library and JSAPI.h file included in,
And the last term is spidermonkey library, you will find it in lib folder, for me it exists in /usr/local/lib

SDL 2.0 compiles, but failt to run

Im using the latest SDL 2.0 version on Xubuntu 64-bits. I installed through the provided install script on the source code.
Compiling works well, however when trying to open a font or image (regardless of its extension), it will always fail to open.
#include <iostream>
#include <SDL2/SDL.h>
#include <SDL2/SDL_ttf.h>
int main (int argc, char *argvp[])
{
if (SDL_Init(SDL_INIT_EVERYTHING) == -1)
{
cout << SDL_GetError() << endl;
}
if (TTF_Init() == -1)
{
std::cout << TTF_GetError() << std::endl;
return 2;
}
TTF_Font *font1 = NULL;
font1 = TTF_OpenFont("SourceSansPro-Regular.ttf", 20);
if (font1 == NULL)
{
std::cout << "ERROR OPENING FONT = " << TTF_GetError() << std::endl;
}
TTF_CloseFont(font1);
SDL_Quit();
return 0;
}
I compiled with
g++ -Wall fontTEST.cpp -o TEST -lSDL2 -lSDL_ttf (NOTE that SDL_ttf installs as such, not as SDL2_ttf)
And get the following error: Failed to load font: 0 Couldn't load font file
This happens with images as well. I've already tried with different fonts and images, apparently it works if I compile with SDL 1.2, just not with 2.0.
Also why does the provided install script installs the lib and include folders in /user/local/?
I moved them to /usr/ but the problem persists.
Remember the following:
On Unix, file paths are case-sensitive
As said in Xonar's comment, tilde '~' expansion is a shell feature, it does not work in C/C++ programs, you should use the real path instead.
The strace log says clearly that something is wrong with the path.
You should try the following:
Rename your font file to "font.ttf"
put it in /home/user/font.ttf
use "/home/user/font.ttf" as the path in your code.