I'm trying to install openCV to Eclipse C++. I installed Opencv and aded the paths and lib files but I get
**** Rebuild of configuration Debug for project test ****
**** Internal Builder is used for build ****
g++ -IC:\opencv\build\include -O0 -g3 -Wall -c -fmessage-length=0 -osrc\main.o ..\src\main.cpp
g++ -LC:\opencv\build\x86\vc10\lib -LC:\opencv\build\x86\vc11\lib -otest.exe src\main.o -lopencv_core247 -lopencv_core247d -lopencv_highgui247 -lopencv_highgui247d -lopencv_imgproc247 -lopencv_imgproc247d
C:/MinGW/i686-pc-mingw32/lib/libmingw32.a(lib32_libmingw32_a-crt0_c.o):crt0_c.c:(.text+0x3c): undefined reference to `WinMain#16'
collect2.exe: error: ld returned 1 exit status
Build error occurred, build is stopped
I know this question has been asked before but in every one of them the answer was "forgetting to include main() function". But I have a main() function and I still get this error.
Do you have any idea what should I do?
The linker probably is defaulted to use the "Windows" subsystem, which means that the main entry point is not the "main" symbol as you expect it to be, but rather "WinMain".
You can specify the subsystem of your application by passing the following argument at your g++ command line:
-Wl,-subsystem,console
(FYI, for the "Windows" subsystem, you'd use -Wl,-subsystem,windows)
You can also set this in the Eclipse project settings in the linker configuration somwhere I believe.
Basically "console", as the name suggests, creates a console-based application whose default entry-point is the main-function, the other will create a Windows GUI application whose default entry-point is the WinMain-function.
Please give it a try :)
Related
I am currently doing unit testing for a project of c/c++ in eclipse IDE (Version: Luna Service Release 2 (4.4.2)) and I have recently upgraded my cygwin to cygwin64 to make it compatible with c++17 standard and my g++ version is g++ (GCC) 10.2.0, But I am not able to build my testsuites in eclipse, I have set the environment path to "C:\cygwin64\bin", But still I am getting the below error. Could you please help me with the below error:
Console output after building my project :
make all
Building file:
C:/Accurev/AngioJet_Development_ver1/CS/AngioJet/Firmware/src/ClinicalFeatures/door.cpp
Invoking: Cygwin C++ Compiler
g++ -DUNIT_TESTING - "C:/Accurev/AngioJet_Development_ver1/CS/ut/testsuites/Firmware/hell/../../../../AngioJet/Firmware/build/PicoZed_FSBL_bsp/ps7_cortexa9_0/include" -I"C:/Accurev/AngioJet_Development_ver1/CS/ut/testsuites/Firmware/hell/../../../testsupport/" -I"C:/Accurev/AngioJet_Development_ver1/CS/ut/testsuites/Firmware/hell/../../../testsupport/Source" -I"C:/Accurev/AngioJet_Development_ver1/CS/ut/testsuites/Firmware/hell/../../../../AngioJet/Firmware/src/Platform/Zynq7000" - I"C:/Accurev/AngioJet_Development_ver1/CS/ut/testsuites/Firmware/hell/../../../../AngioJet/Firmware/src/HostInterface" -I"C:/Accurev/AngioJet_Development_ver1/CS/ut/testsuites/Firmware/hell/../../../../AngioJet/Firmware/soup/treck/6_0_1_56/include" -I"C:/Accurev/AngioJet_Development_ver1/CS/ut/testsuites/Firmware/hell/../../../../Einstein/src/Platform/Zynq7000" -I"C:/Accurev/AngioJet_Development_ver1/CS/ut/testsuites/Firmware/hell/../../../../Einstein/src/Common" -I"C:/Accurev/AngioJet_Development_ver1/CS/ut/testsuites/Firmware/hell/../../../../AngioJet/Firmware/src/Common" -I"C:/Accurev/AngioJet_Development_ver1/CS/ut/testsuites/Firmware/hell/../../../../AngioJet/Firmware/src/ClinicalFeatures" -O0 -g -fprofile-arcs -ftest-coverage -Wall -c -fmessage-length=0 -MMD -MP -MF"src/door.d" -MT"src/door.d" -o "src/door.o" "C:/Accurev/AngioJet_Development_ver1/CS/AngioJet/Firmware/src/ClinicalFeatures/door.cpp"
Finished building: C:/Accurev/AngioJet_Development_ver1/CS/AngioJet/Firmware/src/ClinicalFeatures/door.cpp
Building target: helll.exe
Invoking: Cygwin C++ Linker
g++ -fprofile-arcs -o "helll.exe" ./src/door.o -lgcov -lbfd
/usr/lib/gcc/x86_64-pc-cygwin/10/../../../../x86_64-pc-cygwin/bin/ld: /usr/lib/gcc/x86_64-pc-cygwin/10/../../../../lib/libcygwin.a(libcmain.o): in function `main':
/usr/src/debug/cygwin-3.3.6-1/winsup/cygwin/lib/libcmain.c:37: undefined reference to `WinMain'
collect2: error: ld returned 1 exit status
make: *** [makefile:47: helll.exe] Error 1
07:05:17 Build Finished (took 4s.531ms)
`*
I have uninstalled and reinstalled the softwares. Also I have built a new project from scratch which is building fine but whenever i try to build my project it is not building.
While doing unit testing in eclipse we create the project as c++ project and import the source files mentioned below and the structure is as follow:
Source file - door.cpp, door.h
door.h:
#include "global.h"
namespace lDOOR { void close( BasicTypes::UInt8 mode ); }
door.cpp:
#include "door.h"
void lDOOR::close(void)
{
//Normal Mode
close(BscMsg::NORMAL);
}
and we do the unit testing for the above functions present in .cpp file in the file created by us door_testsuite.h which is as follows:
#include <cxxtest/TestSuite.h>
class door_TestSuite: public CxxTest::TestSuite {
public:
void setUp(){}
void teardown(){}
void testDoorLDoorClose()
{
BscMsg::UInt8 mode = 2;
lDOOR::close(mode);
TS_ASSERT_EQUALS();
}};
And when I test the above code in cygwin terminal it executes completely fine.
This means there is no WinMain function, which is the entry point to Windows windows programs. Yes, confusing. You can choose to either build a program as a console program or windows program. (There are a few other types that are irrelevant) In a console program, the entry point is main (As with the entire world of computing), but in a windows program, it is WinMain. This question has a good answer that goes into depth about it, but you either need to switch the type of program to console, or (If your program is creating and using windows) add a WinMain function.
Sorry if this is confusing, it is difficult to differentiate between Windows, the OS, and windows, the type of program. Also, my knowledge on this subject is all from VSCode, so may be completely or partially incorrect.
TLDR: Either add a WinMain function, or switch to building your program as a windows program.
I'm making a C++ program available under Linux, Mac and Windows environments, respectively.
It uses GiNaC library.
It works fine under Linux and Mac environment.
However, I failed to build it under Windows environment.
I used precompiled GiNaC files including header, library and executable files downloaded from http://theor.jinr.ru/~varg/web/proj/ginac/woe32/ .
The following is the console message, and bold text represents the error message.
08:19:09 **** Incremental Build of configuration Debug for project
metapro **** Info: Configuration "Debug" uses tool-chain "MinGW GCC"
that is unsupported on this system, attempting to build anyway. Info:
Internal Builder is used for build g++
"-LC:\Users\yoons\Documents\ginac-1.4.4-cln-1.2.2-2587288a-gmp-4.2.4-i586-mingw32msvc\opt\ginac\lib\"
"-LC:\vcpkg\packages\gsl_x86-windows\lib"
"-LC:\Users\yoons\Documents\boost_1_70_0\stage\lib" -o
myproject.exe a.o b.o main.o c.o d.o e.o -lginac
-lm -lgsl -lgslcblas c.o: In function `Z7ordmetaSt6vectorINSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEESaIS5_EEPPdS9_iiiS5_':
C:\Users\yoons\eclipse-workspace\metapro\Debug/../c.cpp:53:
undefined reference to
`GiNaC::symbol::symbol(std::__cxx11::basic_string, std::allocator > const&, unsigned int)'
collect2.exe: error: ld returned 1 exit status
08:19:10 Build Failed. 1 errors, 0 warnings. (took 1s.221ms)
A strange thing is that the error occurred only 'symbol' type not others such as 'ex' or other functions provided by GiNaC package.
If anyone knows the answer, please let me know.
Sora
I am trying to build SDL for use with Eclipse. I am trying to remove this linker error:
Beginning Compilation
21:15:53 **** Incremental Build of configuration Debug for project CMD ****
Info: Internal Builder is used for build
g++ "-IC:\\MinGW\\include\\SDL2" -O0 -g3 -Wall -c -fmessage-length=0 -o "src\\CMD.o" "..\\src\\CMD.cpp"
g++ -o CMD.exe "src\\CMD.o" -lmingw32 -lSDL -lSDL2main -lSDL2
ERROR(s):
c:/mingw/bin/../lib/gcc/mingw32/5.3.0/../../../../mingw32/bin/ld.exe: cannot find -lSDL
collect2.exe: error: ld returned 1 exit status
21:15:54 Build Finished (took 1s.36ms)
The most pertinent SO archive source I researched didn't seem to have an actionable answer for my problem, though it had the exact same problem/error:
title --
producing the same error message:
c:/mingw/bin/../lib/gcc/mingw32/4.7.0/../../../../mingw32/bin/ld.exe: cannot find -lSDL.
If you click to the authors "solution" for the same error as mine its not clear to me how he solved it.
Any help?
Problem solved, SDL2 awesome. Ok:
c:/mingw/bin/../lib/gcc/mingw32/4.7.0/../../../../mingw32/bin/ld.exe: cannot find -lSDL.
Reinstallation of SDL2 avoiding binary conflict between SDL files and SDL2 files
as keltar mentioned resolved the immediate problem, and the problem built with no errors!Fixing what was in the braces unmasked new problem: crashing. I stripped the program to bare bones and concluded the crashing was outside of the code since it was occurring even without code.
To solve the new problem would need to go the SDL2 distribution file (the one copied to MinGW) and copy the SDL2.dll from it [DLL from distributable][1]--- by dragging the file over your debug and/or release folders where the .exe file lives.(.exe + dll -> right?) moving dll to exes. Build/Run the program
it should work!
You should see a Welcome message!
https://www.caveofprogramming.com/c-for-complete-beginners/setting-up-sdl-windows.html
I am trying to configure Eclipse such that it compiles a shared library in one project and uses it in another.
The problem is, that using the CUDA plugin for Eclipse one can only choose an executable generating project type.
So what I want to do is creating such a project and modify that toolchain such that Eclipse does not execute anything else than nvcc.
As you can see compiling the library is not a problem:
18:27:25 **** Incremental Build of configuration Default for project cudamath ****
make all
Building file: ../test.cu
Invoking: CUDA NVCC Compiler
nvcc --shared -Xcompiler -fPIC -o "cu_test.o" "../test.cu" && \
echo -n 'cu_test.d' ./ > 'cu_test.d' && \
nvcc -M "../test.cu" >> 'cu_test.d'
nvcc warning : The 'compute_10' and 'sm_10' architectures are deprecated, and may be removed in a future release.
nvcc warning : The 'compute_10' and 'sm_10' architectures are deprecated, and may be removed in a future release.
Finished building: ../test.cu
The problem is that Eclipse then calls g++ which is that step of the toolchain I want to cut off:
Building target: cudamath
Invoking: C++ Linker
g++ -L/opt/cuda/lib64 -o "cudamath" ./cu_test.o -lcuda -lcublas -lcudart
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.9.0/../../../../lib/crt1.o: In function `_start':
(.text+0x20): undefined reference to `main'
collect2: error: ld returned 1 exit status
makefile:32: recipe for target 'cudamath' failed
make: *** [cudamath] Error 1
Is there a way I can do this? I've been crawling through my project settings but I can't seem to find what I'm looking for.
Here's what I did using Nsight Eclipse Edition:
File... new CUDA C/C++ project
In the next dialog, select Shared Library...Empty Project, and give the project a name (let's say it is testlib)
Finish that wizard/dialog. A new testlib project is created in the project explorer on the left
In the project explorer on the left, right click on the project name and create a new folder for your source files
Open that folder and create your new source file. For this, I selected a CUDA C/C++ source file using the CUDA bitreverse "template". This creates a new source file with the bitreverse code in it.
change int main() { in your source file to int myfunc(){
save the source file and build the project. A new libtestlib.so is successfully built.
I am have been attempting to get a C++ project setup using boost file system library using eclipse. I followed these directions to install boost on my system. The directions where pretty much
download
extract
run bootstrap.sh
run ./bjam architecture=combined
That seemed to go fine, no errors. I then fired up eclipse and created a new test project called test with a single file called test.cpp. The code in it is:
#include <stdio.h>
#include <boost/filesystem.hpp>
int main() {
boost::filesystem::path path("/Users/schoen"); // random pathname
bool result = boost::filesystem::is_directory(path);
printf("Path is a directory : %d\n", result);
return 0;
}
This is just something simple to make sure it is all set up correctly. Of course I tried to compile at this point and it failed. Did some googling and found this site. It said to add the boost library to the linker by going to project properties and adding "boost_filesystem". I tried this, and well it didn't work.
Can someone point me in the right direction or give me a hint to how to set up Boost in an Eclipse project?
I am new to C++ and Eclipse, and most my experience is in Java with Netbeans. So I am pretty lost at the moment.
UPDATE
I just wanted to update on what I have tried based on the answers given.
Based on Alex's suggestion I added boost_system and boost_filesystem to the linker list. I was still getting the same compiler errors.
Following the suggestion from rve I added the path to the boost libraries to the Library search path. When this did not work. I cleared out the linker list and tried it with just the library search path. This also did not work.
I then cleared the Library search path. I then manually edited the command on the linker window to be 'g++ -L/Users/jacobschoen/Library/boost_1_45_0/stage/lib -lboost -lboost_filesystem'. This also did not work.
In all of these I tried setting the path to boost to be '/Users/jacobschoen/Library/boost_1_45_0' and '/Users/jacobschoen/Library/boost_1_45_0/stage/lib'. Neither worked.
As requested the comiler error for the above code is:
**** Build of configuration Debug for project test ****
make all
Building file: ../src/test.cpp
Invoking: GCC C++ Compiler
g++ -O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"src/test.d" -MT"src/test.d" -o"src/test.o" "../src/test.cpp"
../src/test.cpp:10:32: warning: boost/filesystem.hpp: No such file or directory
../src/test.cpp: In function 'int main()':
../src/test.cpp:13: error: 'boost' has not been declared
../src/test.cpp:13: error: expected `;' before 'path'
../src/test.cpp:14: error: 'boost' has not been declared
../src/test.cpp:14: error: 'path' was not declared in this scope
make: *** [src/test.o] Error 1
If any one has any further suggestions I am still trying.
Second Update
On a suggestion by rholmes I added an include library along with the linker list and library search path. So now the compile error is:
**** Build of configuration Debug for project test ****
make all
Building target: test
Invoking: MacOS X C++ Linker
g++ -L/Users/jacobschoen/Library/boost_1_45_0 -o "test" ./src/test.o -lboost_system -lboost_filesystem
ld: library not found for -lboost_system
collect2: ld returned 1 exit status
make: *** [test] Error 1
Any ideas?
Just wanted to be clear on what actually worked, since it was kinda pieced together from a few answers.
Download the boost files and extract them to where you want to put them.
In your terminal navigate to the directory and run ./bootstrap.sh
When that is done run ./bjam (this takes a while so go smoke and get a cup of coffee)
Open up your eclipse Project and go to Project > Properties > C/C++ Build > Settings
Click on MacOS X C++ Linker > Libraries.
You should see a split window with the top being for 'Libraries (-l)'. In this section add both boost_system and boost_filesystem. In the bottom section it should be for 'Library Search Path (-L)'. Here you want to put the path to the stage/lib directory inside where you extracted the boost download. It should look similar to below:
Click GCC C++ Compiler > Includes. This will be a single pane where it says 'Include Paths (-I)', well I think it is an I as he font is weird and could be a lower case l also. Anyway in that section add the path to where you put boost without the stage/lib part. It should look like below:
Everything should compile now with out a problem, and if you need to use any other boost libraries it should be just a matter of adding it to the linker section where boost_filesystem and boost_system are. Enjoy.
Not sure where you do this in Eclipse these days, but under the include paths for Eclipse should be the path to the main boost directory (/Users/jacobschoen/Library/boost_1_45_0?). The compiler line should have something like the following in it, I would think:
Invoking: GCC C++ Compiler
g++ -I/Users/jacobschoen/Library/boost_1_45_0 -O0 -g3 -Wall -c -fmessage-length=0 -MMD (etc..)
Update: Looking at my system, the linker path on yours might be more appropriately:
-I/Users/jacobschoen/Library/boost_1_45_0/stage/lib
Depending, of course, upon how you've installed and built boost -- this is with my most recent attempt with a full source build. Depending upon how you obtained boost, this may or may not be different. I recently redid the boost on my Mac for 64 bit and haven't had much time to try it yet....
Add boost_system to the linker list, together with boost_filesystem.
I had recently uninstalled the boost rpm and installed Boost like how you did. I had no problems running Boost programs in Eclipse. I didn't add any extra parameters. Just installed boost and ran Boost programs. It works fine.
Tried your program in the vi editor. Commented out everything in main
#include <cstdio>
#include <boost/filesystem.hpp>
int main() {
/*boost::filesystem::path path("/Users/schoen"); // random pathname
bool result = boost::filesystem::is_directory(path);
printf("Path is a directory : %d\n", result);*/
return 0;
}
and it still gave this error:
/tmp/cc7TAIYS.o: In function `__static_initialization_and_destruction_0(int, int)':
test.cpp:(.text+0x29): undefined reference to `boost::system::get_system_category()'
test.cpp:(.text+0x35): undefined reference to `boost::system::get_generic_category()'
test.cpp:(.text+0x41): undefined reference to `boost::system::get_generic_category()'
test.cpp:(.text+0x4d): undefined reference to `boost::system::get_generic_category()'
test.cpp:(.text+0x59): undefined reference to `boost::system::get_system_category()'
collect2: ld returned 1 exit status
I'm puzzled. Boost programs work on my system, but your program's header files itself are giving a problem. I doubt it's a problem with Eclipse. It has to be something else.
I just ran into something very similar to this using eclipse and CDT... It turns out, using ubuntu and apt-get, libboost_system installs as libboost_system.1.40.0 in /usr/lib
If you try to add it via the library tab in Helios it will complain because it is looking for *.so and *.s0.1.40.0 clearly doesn't match that. However after looking closely at what the linker was trying to doo, I just typed the raw string "boost_system" into the include path adder. This resulted in the linker doing a " -lboost_system" which is a format the linker knows how to deal with in resolving version dependency... If you instead put in the full path to the .so file, the linker will just complain because it tries to do a " -l/usr/lib/libboost_system.so.1.40.0" .
So take my advice and just type in the simple " boost_system" after doing an apt-get install.. It will make it all very easy.