On Windows 10 I installed MinGW, and use Eclipse to write C++ programs together with Boost libraries 1.71.0 (for example boost/algorithm/string.hpp).
I can successfully create the executable using boost::replace_all(doc, "#", "_"); in my source code.
The compiler is GCC version 8.2.0
As I also want use the Boost.regex library I built the Boost libraries suffing following commands commands in a Command Prompt window
bootstrap.bat
.\b2 --prefix=C:\Users\makkun\Documents\boost_1_71_0\build install
I then changed to the Boost root directory and invoked b2 as follows:
b2 --build-dir=C:\Users\makkun\Documents\boost_1_71_0\build toolset=gcc --build-type=complete stage
The directory C:\Users\makkun\Documents\boost_1_71_0\stage\lib was created and I can see the regex related files
libboost_regex-mgw82-mt-d-x32-1_71.a
libboost_regex-mgw82-mt-d-x32-1_71.dll.a
libboost_regex-mgw82-mt-sd-x32-1_71.a
libboost_regex-mgw82-mt-s-x32-1_71.a
libboost_regex-mgw82-mt-x32-1_71.a
libboost_regex-mgw82-mt-x32-1_71.dll.a
libboost_regex-mgw82-mt-d-x32-1_71.dll
libboost_regex-mgw82-mt-x32-1_71.dll
In Eclipse I added in MinGW C++ Linker > Libraries > Library search path (-L) the library folder "C:\Users\makkun\Documents\boost_1_71_0\stage\lib"
In my source code I have
#include <boost/regex.hpp>
...
boost::regex e("(\\d{4}[- ]){3}\\d{4}");
The compilation is OK, but the linking with command
g++ "-LC:\\Users\\makkun\\Documents\\boost_1_71_0\\stage\\lib" "-LC:\\Users\\makkun\\Documents\\boost_1_71_0\\libs" -o LastDoc.exe "src\\LastDoc.o"
fails with 46 errors of the type undefined reference to:
c:/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../../mingw32/bin/ld.exe: src\LastDoc.o: in function `ZN5boost16re_detail_10710027cpp_regex_traits_char_layerIcEC2ERKNS0_21cpp_regex_traits_baseIcEE':
C:/Users/makkun/Documents/boost_1_71_0/boost/regex/v4/cpp_regex_traits.hpp:370: undefined reference to `boost::re_detail_107100::cpp_regex_traits_char_layer<char>::init()'
c:/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../../mingw32/bin/ld.exe: src\LastDoc.o: in function `ZN5boost16re_detail_10710011raw_storage6extendEj':
C:/Users/makkun/Documents/boost_1_71_0/boost/regex/v4/regex_raw_buffer.hpp:131: undefined reference to `boost::re_detail_107100::raw_storage::resize(unsigned int)
...'
I also tried to add in MinGW C++ Linker > Libraries > Libraries (-l) string "boost-regex" but the linker does find it
c:/mingw/bin/../lib/gcc/mingw32/8.2.0/../../../../mingw32/bin/ld.exe: cannot find -lboost_regex
Can anybody suggest where the problem is, please?
Related
I am trying to run gtest on the codeblocks ide in ubuntu 17.10. It keeps coming back with undefined reference to "x" error.
After some googling it seems that that the ide is missing linker libraries for gtest. Where may I find the linker libraries for gtest?
I have installed gtest using this command:
sudo apt install libgtest-dev
and test built it using this command:
g++ -I /usr/include/gtest -I /usr/src/gtest/ -c /usr/src/gtest/src/gtest-all.cc
The linker to gtest is -lgtest wich you should add in project/build options/Linker settings -> other linker options. Make sure to select the right target (Debug/release) on the left menu.
A good step by step guide has been made here
Based on the answer by Some programmer referencing linking googletestand codeblocks
I found libgtest.a and pthread in the following directories:
/usr/lib/libgtest.a
/usr/lib/x86_64-linux-gnu/libpthread.so
I added the two files through Settings --> Compiler... --> Linker Settings
My test now compiles.
I am using Armadillo along with OpenBLAS for linear algebraic operations. For a sample code I am linking these libraries using following commands:
g++ sample.cpp -I "path\armadillo\include" -I "path\OpenBLAS\include" -L "path\OpenBLAS\lib" -llibopenblas
The code is compiled and runs successfully. Therefore, to link these libraries with CodeBlocks I used Linker setting and Search Directories option to specify location for libraries. But I am getting following errors:
path\OpenBLAS\lib\libopenblas.a(dormqr.o):dormqr.f|| undefined reference to `_gfortran_concat_string'|
Is this related with linking libraries or with compiler?
When I am including the asio header:
#include <boost/asio.hpp>
I got the error:
undefined reference to boost::system::generic_category()
So I read that I had to link to boost_system which I did. But now it gives the error::
cannot find -lboost_system
Why can it not find boost_system. I'm using Codeblocks on Windows.
boost is a separate library that needs to be installed on you building machine.
Please follow these instructions to install:
http://www.boost.org/doc/libs/1_55_0/doc/html/bbv2/installation.html
http://www.boost.org/
After installation your application needs to be able to find it if it is not installed in a standard location.
you will need to supply the header and lib directories to the build process.
g++ source source.cpp -I/path to boost headers -L path to boost libs -lboost_system
Look inside you libs directory to be sure that you have boost_system. It is possible depending on the build that you may only have boost_system-mt
I've been working on this for a while now, and can't seem to make sense of the situation - partly bceause I don't fully understand what's going on (which is why I came here).
I'm doing a sort of boost hello world as follows:
#include <boost/thread/thread.hpp>
#include <cstdio>
void helloworld() {
std::printf("HELLO FROM A BOOST THREAD!");
}
int main(int argc, char **argv) {
boost::thread t(&helloworld);
t.join();
}
This is on Windows. I stored the Boost directory in C:\Boost. I ran bootstrap and bjam, and now have a stage/lib folder that contains all the .lib files. The lib files relating to the boost/thread library are:
libboost_thread-vc100-mt.lib
libboost_thread-vc100-mt-1_46_1.lib
libboost_thread-vc100-mt-gd.lib
libboost_thread-vc100-mt-gd-1_46_1.lib
Now I compile:
g++ -c main.cpp -I/Boost
that line works fine, I get main.o. Then:
g++ -o test.exe main.o -L/Boost/stage/lib -llibboost_thread-vc100-mt
And that's where the trouble happens. First of all, If I didn't type the -l argument the way I did, MinGW couldn't even find the file. Meaning, if I tried:
-lboost_thread-vc100-mt
instead of the way I typed it above (and how I thought it should be done), ld would exit with no such file. Anyway, this is now the output I'm getting from that line:
main.o:main.cpp:(.text+0x47): undefined reference to `_imp___ZN5boost6thread4joinEv'
main.o:main.cpp:(.text+0x55): undefined reference to `_imp___ZN5boost6threadD1Ev'
main.o:main.cpp:(.text+0x70): undefined reference to `_imp___ZN5boost6threadD1Ev'
main.o:main.cpp:(.text$_ZN5boost6threadC1IPFvvEEET_NS_10disable_ifINS_14is_convertibleIRS4_NS_6detail13thread_move_tIS4_EEEEPNS0_5dummyEE4typeE[boost::thread::thread<void (*)()>(void (*)(), boost::disable_if<boost::is_convertible<void (*&)(), boost::detail::thread_move_t<void (*)()> >, boost::thread::dummy*>::type)]+0x23): undefined reference to `_imp___ZN5boost6thread12start_threadEv'
collect2: ld returned 1 exit status
Now somewhere in there, I can tell that these are apparently the functions I'm supposed to be getting from boost/thread, and apparently it does find the lib file, so why isn't it linking correctly?
Thank you very much for any help!
EDIT:
I've rebuilt boost using the bjam "stage" option
bjam toolset=gcc stage
Now, after the build completes, I'm left with a stage/lib folder with .a files, as is to be expected. These are the boost/thread related libraries:
libboost_thread-mgw45-mt-1_46_1.a
libboost_thread-mgw45-mt-d-1_46_1.a
However, linking as follows:
g++ -o test.exe main.o -L/Boost/stage/lib -lboost_thread-mgw45-mt-1_46_1
outputs the exact same errors. Also tried:
g++ -o test.exe main.o -L/Boost/stage/lib -lboost_thread-mgw45-mt-1_46_1 -static
I'm at a loss, still.
Solved the problem. Boost's headers are configured to be dynamically linked, but the dynamic libraries (dll's) are not built unless you specify:
--build-type=complete
when invoking bjam. After that, copy the appropriate dll to your application directory, but still use the
-L/BOOST_DIR/stage/lib -lname
when linking.
This set of library files:
libboost_thread-vc100-mt.lib
libboost_thread-vc100-mt-1_46_1.lib
libboost_thread-vc100-mt-gd.lib
libboost_thread-vc100-mt-gd-1_46_1.lib
are for the Visual Studio 2010 compiler. They won't work with GCC. If you want to use gcc/MinGW, you'll need to download/build a set of boost libraries for that compiler. Alternatively you can install VS 2010 and use that compiler (the free VC++ 2010 Express version should work fine if cost is an issue).
You can get a MinGW distribution with Boost already in the package from http://nuwen.net/mingw.html (32-bit target only, I believe).
To answer about getting the errors with using the MinGW libs:
The _imp_ prefixes on the symbols is an indication that g++ is looking to link to a a dll/shared library. The .lib file you have are for static libraries (which is what also what I get when doing a straightforward bjam build of the libraries). If you look in boost/thread/detail/config.hpp you'll see that for Win32 builds it defaults to building against a DLL library unless the MSVC or Intel compiler is being used.
I'm not even sure exactly how to build the DLL libraries - I'll have to look it up. In the meantime, you can use the following command to build your example such that it'll link against the static library. The BOOST_THREAD_USE_LIB macro build the .cpp file such that it'll expect to link against the static library:
g++ -I/Boost -DBOOST_THREAD_USE_LIB -c main.cpp
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.