I'm getting the following error:
ld.exe||cannot find -lD:\Libraries\boost_1_47_0\boost_1_47_0\stage\lib|
Even though the path is valid. Any thoughts on that?
Edit:
Thanks MichalR!
For others, in order to configure boost for gcc:
Download boost
install it according to instructions from boost site
In code::blocks in Settings/global variables add path to your boost library for base and lib fields (this should be located in stage/lib folder)
In code::blocks in Project/Build options..., linker settings tab, link libraries - add here those libraries
In code::blocks in Project/Build options...Search directories tab in compiler subtab add $(#boost) and in linker subtab add $(#boost.lib).
Done. I spent a few days on this, but it was worth it. Now I can use this great IDE with gcc compiler which at the moment of this writing is miles ahead of MS. I am not being stopped in my personal development by MS - C++11 here I come!
The params for ld are e.g.:
-larchive
-Lsearch_path
The first tells what library to look for, the latter specifies library search paths.
Perhaps you have these options mixed in your command line - it looks you have -l with a directory parameter.
Related
I'm using the <XZY> IDE to compile my program, and have some trouble to import/integrate a specific library with it.
I get error messages like
fatal error: 3rdPartyLib.h: No such file or directory
for a
#include "3rdPartyLib.h"
statement
ld.exe: cannot find `lib3rdParty.a`
for specifying
3rdParty
in the additional libraries
At least I got some error message like
undefined reference to `lib3rdParty::foo()'
What can I do to fix this?
It's a common misconception, that the current IDE used, is responsible for getting errors like stated in the question.
See for example
c++ lib in two same project ,one can work but the other can 't
Issue linking libxml++ and glib libraries with CodeBlocks IDE for C++ Windows
...
The problem is almost never related to the currently used IDE.
In the most cases the solution boils down, to supply the actual toolchain's compiler/linker with the appropriate path's to search for included headers, to be linked libraries.
One of the major applicable answers for the linker related problems are
What is an undefined reference/unresolved external symbol error and how do I fix it?
undefined reference to `WinMain#16'
Most of the common IDEs provide features to configure this for a specific project. Here are some samples
Eclipse-CDT
Include path settings:
Library & library search path settings
Visual Studio 2013
Code Blocks
**DEV C++ (Bloodshed C++)
As from their FAQ:
9. How can i use the OpenGL library and others ?
All the libraries that comes with Mingw reside in the Lib directory. They are all named in the following way: lib*.a
To link a library with your project, just add in Project options, Further option files :
-lopengl32
This is for including the libopengl32.a library. To add any other library, just follow the same syntax:
Type -l (L in lowercase) plus the base name of the library (filename without lib and the .a extension).
You may also consider putting a -L option there to add directory pathes searched for libraries.
Qt Creator
In order to add include paths you have to open up the .pro file and then add
the directories to the INCLUDEPATH variable. These paths are separated by spaces. Reference can be found here.
If none of the above samples applies for your actually used IDE/toolchain, I hope you're able to get the point of abstraction:
It's an issue how to provide compiling/linking options to your actual toolchain. The IDE used to setup the context is a minor point here.
For eclipse I use the pkg-config plugin where possible:
https://marketplace.eclipse.org/content/pkg-config-support-eclipse-cdt
Failing that this configuration window:
I'm using the <XZY> IDE to compile my program, and have some trouble to import/integrate a specific library with it.
I get error messages like
fatal error: 3rdPartyLib.h: No such file or directory
for a
#include "3rdPartyLib.h"
statement
ld.exe: cannot find `lib3rdParty.a`
for specifying
3rdParty
in the additional libraries
At least I got some error message like
undefined reference to `lib3rdParty::foo()'
What can I do to fix this?
It's a common misconception, that the current IDE used, is responsible for getting errors like stated in the question.
See for example
c++ lib in two same project ,one can work but the other can 't
Issue linking libxml++ and glib libraries with CodeBlocks IDE for C++ Windows
...
The problem is almost never related to the currently used IDE.
In the most cases the solution boils down, to supply the actual toolchain's compiler/linker with the appropriate path's to search for included headers, to be linked libraries.
One of the major applicable answers for the linker related problems are
What is an undefined reference/unresolved external symbol error and how do I fix it?
undefined reference to `WinMain#16'
Most of the common IDEs provide features to configure this for a specific project. Here are some samples
Eclipse-CDT
Include path settings:
Library & library search path settings
Visual Studio 2013
Code Blocks
**DEV C++ (Bloodshed C++)
As from their FAQ:
9. How can i use the OpenGL library and others ?
All the libraries that comes with Mingw reside in the Lib directory. They are all named in the following way: lib*.a
To link a library with your project, just add in Project options, Further option files :
-lopengl32
This is for including the libopengl32.a library. To add any other library, just follow the same syntax:
Type -l (L in lowercase) plus the base name of the library (filename without lib and the .a extension).
You may also consider putting a -L option there to add directory pathes searched for libraries.
Qt Creator
In order to add include paths you have to open up the .pro file and then add
the directories to the INCLUDEPATH variable. These paths are separated by spaces. Reference can be found here.
If none of the above samples applies for your actually used IDE/toolchain, I hope you're able to get the point of abstraction:
It's an issue how to provide compiling/linking options to your actual toolchain. The IDE used to setup the context is a minor point here.
For eclipse I use the pkg-config plugin where possible:
https://marketplace.eclipse.org/content/pkg-config-support-eclipse-cdt
Failing that this configuration window:
I'm using the <XZY> IDE to compile my program, and have some trouble to import/integrate a specific library with it.
I get error messages like
fatal error: 3rdPartyLib.h: No such file or directory
for a
#include "3rdPartyLib.h"
statement
ld.exe: cannot find `lib3rdParty.a`
for specifying
3rdParty
in the additional libraries
At least I got some error message like
undefined reference to `lib3rdParty::foo()'
What can I do to fix this?
It's a common misconception, that the current IDE used, is responsible for getting errors like stated in the question.
See for example
c++ lib in two same project ,one can work but the other can 't
Issue linking libxml++ and glib libraries with CodeBlocks IDE for C++ Windows
...
The problem is almost never related to the currently used IDE.
In the most cases the solution boils down, to supply the actual toolchain's compiler/linker with the appropriate path's to search for included headers, to be linked libraries.
One of the major applicable answers for the linker related problems are
What is an undefined reference/unresolved external symbol error and how do I fix it?
undefined reference to `WinMain#16'
Most of the common IDEs provide features to configure this for a specific project. Here are some samples
Eclipse-CDT
Include path settings:
Library & library search path settings
Visual Studio 2013
Code Blocks
**DEV C++ (Bloodshed C++)
As from their FAQ:
9. How can i use the OpenGL library and others ?
All the libraries that comes with Mingw reside in the Lib directory. They are all named in the following way: lib*.a
To link a library with your project, just add in Project options, Further option files :
-lopengl32
This is for including the libopengl32.a library. To add any other library, just follow the same syntax:
Type -l (L in lowercase) plus the base name of the library (filename without lib and the .a extension).
You may also consider putting a -L option there to add directory pathes searched for libraries.
Qt Creator
In order to add include paths you have to open up the .pro file and then add
the directories to the INCLUDEPATH variable. These paths are separated by spaces. Reference can be found here.
If none of the above samples applies for your actually used IDE/toolchain, I hope you're able to get the point of abstraction:
It's an issue how to provide compiling/linking options to your actual toolchain. The IDE used to setup the context is a minor point here.
For eclipse I use the pkg-config plugin where possible:
https://marketplace.eclipse.org/content/pkg-config-support-eclipse-cdt
Failing that this configuration window:
I am adding extensions to an (another persons) existing project at my company. Now I want to import an existing library like boost to it. I am using netbeans for debugging the existing project. Now in order to import a library into netbeans usually 2 steps are followed:
Include directories
Linker-> Add Library.
However when I right click on my existing project the option of Linker->Add Library is not appearing. (Though I have included the directories as that option is there).
Can someone please guide me as to how should I add the library through linker to my existing project? My project is in C++
Assuming you are using unix/linux variants:
Directories for headers and library linking are two different things. Include directories will have the headers needed, but after compilation the actual compiled code that resides in the libraries (*.a, *.so, etc...) might also be required.
For example, if you are using pthreads, apart from the headers which you need to include, you also need libpthread.
When linking, you need to provide the flag for linking with pthread i.e: -lpthread
You can search using find or locate on a unix system to find the libraries. In my case, its in
/usr/lib/libpthread.so
Therefore,
gcc myfile.c -lpthread -o myfile
Will link myfile.c with pthread library
Whereas,
gcc -L/usr/local/lib/
Tells gcc to look under /usr/local/lib to search for the library (not the header!).
Telling netbeans where the headers are, isn't enough, it will probably give you linking errors. Telling netbeans where the libraries are, may be enough, as it might use the proper flags. If that also fails, then you have to specify both the library flags and the path.
Alternatively, you may use tools like cmake, make, etc which automate this process and provide a bit more control IMO.
See Link 1
See link 2
I'm having my first fling with the Boost libraries, and I've picked a pretty girl named Regex.
I've installed the libraries (which build automatically?) on my machine, but I'm getting the above error (cannot find -lboost_regex). I'm using Code::Blocks with MinGW, and a C++0X compiler flag.
I have
Pointed the "search directories" to the installation directory
Added the -lboost_regex flag to the linker
but no luck. Can someone help me get this working?
Update
Got things running now. I've added some further notes in an answer below, for newcomers to this problem.
(Also, changed the title of the question since it turned out to be a broader issue than when I started out.)
Here's some links and tips that can help a newcomer, from my first build experience. I built the libraries directly from the zip file. I built on MinGW and I used CodeBlocks for the IDE.
Download Boost zip, unzip somewhere (I'll call that place $boostdir)
Pretty large when unzipped, > 300MB
Add MinGW bin to PATH var
When Boost builds, it will need access to MinGW executables
Build b2.exe and bjam.exe
The documentation for Windows blithely assumes MSVC compiler is available.
If it is, you can apparently use the bootstrap.bat like the docs say.
If it's not (like mine), you'll have to build the exe files yourself, in steps 4 and 5.
In CMD, navigate to $boostdir/tools/build/v2/engine
Run build.bat mingw (will build b2.exe and bjam.exe)
Some aging basic documentation on that
Now you've got b2 and bjam custom-built according to your system spec. Navigate back up to $boostdir and get ready to start building the libraries.
Boost will make a new bin.v2 directory in the current directory.
All the libs will go in bin.v2.
This is an "intermediate" directory, for some reason
Nothing to do in this step, just some extra info :)
Run b2 toolset=gcc --build-type=complete
This takes a long time, in the neighborhood of 1 - 2 hours.
You'll know if it's working. If you think something's wrong, it's not working.
The build can use various flags
Now you're all built. Time to set up CodeBlocks.
Point your compiler to the header files
Right click your project -> Build Options -> Search Directories tab -> Compiler tab -> add $boostdir address
Boost has built a DLL for the library you want according to your current system spec. Look in the stage\lib\ directory of $boostdir
This DLL will be used later in the linker, so don't close its explorer window yet
Mine was in C:\Program Files\Boost_1_52\stage\lib\libboost_regex-mgw44-1_52.dll
I think the documentation had a smart way to do this but I haven't tried it yet
The "intermediate" directory from step #6 can be deleted now that the build is finished
Point your linker to the directory of that DLL
Right click your project -> Build Options -> Search Directories tab -> Linker tab -> add
that directory address (blah\blah\blah\stage\lib\)
Add that DLL flag to your linker settings
Mine was -lboost_regex-mgw44-1_52
Deep breath, prayers to your god, and fire up a test.
Further docs that may either help or confuse:
The Code::Blocks website has a version of this that I didn't find until I neared the end of my search. It was fairly helpful but had a few weird things. This post also is helpful.
Good luck!
I'm not sure what you mean by which build automatically. Most of the Boost libraries are header-only, but a few, such as regex, need to be compiled to a shared / static library. The compilation step is not automatic, you need to invoke the Boost build system (bjam) to do this. Of course, there are sources (BoostPro for instance) that distribute pre-built Boost binaries for various platforms.
Once that's done, you need to add the path where the libraries are present to the linker's search path. For MinGW, this option is -L"path/to/library". Boost does have directives to allow auto-linking of the required libraries, and this seems to work pretty well with MSVC, but I've never gotten it to work with MinGW. So you must also list the libraries to be linked explicitly. The Boost libraries include target and version information in the file name by default, so a typical linker command line option will look like -lboost_regex-mgw47-mt-1_51 for MinGW gcc 4.7 and Boost 1.51