I've built and installed a library called sbpl on linux\ubuntu. After installing i have the following files:
usr/local/include/sbpl (have a bunch of files here including a headers.h file)
usr/local/lib has a libsbpl.so file
Now I'm having some trouble compiling a simple program:
yus.cpp
#include <iostream>
#include <sbpl/headers.h>
int main()
{
EnvironmentType type;
return 0;
}
Using these commands to compile i get errors:
$ g++ yus.cpp -Iusr/local/include/sbpl gives the following error
"error: 'EnvironmentType' was not declared in this scope"
$ g++ yus.cpp -L.-lsbpl gives the same error as above
How does one go about compiling and linking the library correctly?
Move the definition of enum EnvironmentType from main.cpp to headers.h and then run g++ yus.cpp -I/usr/local/include -L/usr/local/lib -lsbpl
Related
I'm trying to use a couple of functions from the Boost Math library in some C++ code using the G++ compiler but I've been unsuccessful. This is on macOS.
I downloaded and extracted the Boost tar.gz from here and placed it into my source folder.
Within my C++ I've tried
#include "boost_1_63_0/boost/math/distributions/chi_squared.hpp" and
#include <boost_1_63_0/boost/math/distributions/chi_squared.hpp>.
The quotation version partially works but the chi_squared.hpp file includes fwd.hpp using the bracket (#include <...>) notation and that breaks my compilation with error In file included from main.cpp:9: ./boost_1_63_0/boost/math/distributions/chi_squared.hpp:12:10: fatal error: 'boost/math/distributions/fwd.hpp' file not found #include <boost/math/distributions/fwd.hpp>.
To compile I've used an assortment of commands, all unsuccessfully:
g++ -L /boost_1_63_0/boost/math/distributions main.cpp
g++ -I"/boost_1_63_0/boost/math/" main.cpp
g++ -I "/boost_1_63_0/boost/math/" main.cpp
g++ main.cpp -lboost_math
What is the correct include statement and G++ command that I need to use?
Resolved using
#include "/Users/[me]/[project_dir]/boost_1_63_0/boost/math/distributions/chi_squared.hpp"
and
g++ -I/Users/[me]/[project_dir]/boost_1_63_0/ main.cpp
I am trying to use this C++ library (png++) on Windows, but I unable to compile any program when I use it. Example of Code I am using to test:
#include <png++/png.hpp>
#include <png.h>
int main(){
//anything
}
When I try to compile using g++ -I path/png++ main.cpp -o main, I get
fatal error: png++/png.hpp: No such file or directory
#include <png++/png.hpp>
I understand png++ depends on libpng, I tried adding it as an I- flag, i.e. compile using
g++ -I path/png++ -I path/libpng main.cpp -o main, but it doesn't resolve the issue, png.h is found by the compiler but not png++/png.hpp.
I hope someone will be able to help.
Thanks!
I am trying to use the boost library with QT on windows. I've successfully build the library and also managed to include it in my project. However, on including gmp (#include "boost/multiprecision/gmp.hpp") and creating an object (boost::multiprecision::mpz_int myint;) I get the following error:
C:\Users\Laurenz\Documents\libraries\boost_1_66_0\include\boost\multiprecision\gmp.hpp:31: error: gmp.h: No such file or directory
And indeed, I haven't been able to find any such file in the boost directory. What did I do wrong?
Install the dependency and link to it. (See What is an undefined reference/unresolved external symbol error and how do I fix it?)
Alternatively, consider not using GMP, using cpp_int.hpp instead.
Since you already installed the GMP library, here's the last step:
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#include <boost/multiprecision/gmp.hpp>
#include <iostream>
int main() {
boost::multiprecision::mpz_int i("1238192389824723487823749827349879872342834792374897923479");
std::cout << pow(i, 3) << "\n";
}
Note the -lgmp flag at the end of the compile/link command:
g++ -std=c++11 -O2 -Wall -Wextra -pedantic main.cpp -o demo -lgmp
Running it:
./demo
1898298004808110659499396020993351679788129852647955073547637871096272981567489303363372689896302906549189545322451852317205769760555889831589125591739044248515246136031239
I am OS X user and I've recently installed "cppunit" library using brew. When I try to compile "test.cpp" file using TestCase.h header the error occurs:
> test.cpp:3:10: fatal error: 'TestCase.h' file not found
> #include "TestCase.h"
I am compiling this file:
test.cpp
#include <iostream>
#include "TestCase.h"
using namespace CppUnit;
class EmptyTest : public TestCase
{
};
int main()
{
}
Using this command:
g++ -Wall -pedantic -std=c++14 test.cpp -o test.x -lcppunit
I've also tried compiling with -I giving the path to the library directory but still with the same error.
All my friends using cppunit and brew can simply include the header and the program works fine.
I would appreciate every answer.
I've solved this problem. I had issues with Xcode. Reinstall works fine.
I get the error
"/usr/include/c++/5/cstddef:51:11: error: ‘::max_align_t’ has not been declared
using ::max_align_t;
^"
So I should update the libraries because I find this solution:
"A workaround until libraries get updated is to include <cstddef> or <stddef.h> before any headers from that library."
I wrote some command on the Ubuntu terminal such as:
bash $ sudo apt-get install apt-file
bash $ sudo apt-file update
bash $ apt-file search stddef.h
Then still the error exist.
Thank you
In the .cpp file where this compile error occurs you need to add
#include <cstddef>
before any of the other headers, e.g.
main.cpp (broken)
#include <cstdio>
int main()
{
using ::max_align_t;
puts("Hello World");
return 0;
}
Try to compile that:
$ g++ -std=c++11 -o test main.cpp
main.cpp: In function ‘int main()’:
main.cpp:5:10: error: ‘::max_align_t’ has not been declared
using ::max_align_t;
^
Then fix it:
main.cpp (fixed)
#include <cstddef>
#include <cstdio>
int main()
{
using ::max_align_t;
puts("Hello World");
return 0;
}
Compile and run it:
$ g++ -std=c++11 -o test main.cpp
$ ./test
Hello World
I compiled some code with GNU C++ 4.9 on CentOS, and the issue was not solved by ensuring top position #include (or by the older header name stddef.h).
Weird enough, I searched all header files of the compiler libraries for the global definition of max_aling_t as declared in the offending using declaration... and found none! Could it be in some 'internal compiled header?
So I simply commented-out the "using ::max_align_t;" line in the standard header (not proud of doing this indeed) and it solved the problem... and code is running...
if anyone can explain what is the meaning/impact of this max_align_t ?
I also commented-out the using ::max_align_t; line in /usr/include/c++/4.9/cstddef, while, code is running, but I don't know if there are any consequences by doing this...