I am trying to modify the source code to an open source application on windows that uses mingw.
I am having a problem linking the psapi library.
psapi.h and libpsapi.a are in the mingw directory and I have tested it using the standard
gcc -o program program.c -lpsapi
method, and it works.
However, when I try to compile the program using the
./configure
make
method, it doesn't work I have tried,
./configure LDFLAGS=-lpsapi
make
and that doesn't work
and I tried going into the makefile.am and putting -lpsapi in AM_LDFLAGS but that doesn't work
The error it gives is just a standard "undefined reference to [function]", implying that the library with the functions is not linked
I have even tried putting psapi.h in the source directory and including it as #include "psapi.h" and that STILL didn't work.
LDFLAGS is the wrong one.
LIBS=-lpsapi should do the trick.
The order is important for the linker. The libraries (LIBS) have to come after the objects, LDFLAGS can be before.
Related
Im working on a program for my studies, that uses an open source library. It is meant to run on Raspberry Pi (Raspbian Kernel). Because of my intention to be also able to load it on a PLC i used mostly pure C. The Library itself comes with suitable header and .c files.
When i use the pre installed GCC compiler on the Raspberry my program compiles without any errors and works fine. Now here comes my problem:
I tried to get this projekt to work on windows using code::blocks IDE with MinGW installed. I revisited the library and downloaded the zip for windows (apperently same header and .c file, but also .lib and .dll included).
I set the search directories and linker settings within the project and included the header as usual with #include "header.h" for the relative path. It doesn't compile and gives alot multible definition and first defined here which usually indicate wrong linking and inclusion.
As i tried to identify some of this definitions i noticed that the functions which cause errors are defined one time in the library.c file. At the beginning of this .c file it also includes the header one time.
Short summary:
This works with raspbian GCC:
$ gcc -sdt=c99 main.c library.c -o executable
but gives errors with Windows IDE + MinGW
Am i missing something serious? The dynamic link lib should only be used by the executable afterwards. I thought maybe the libraby.c gets replaced by the library.lib but if i remove one of them the project doesn't know the functions. I also searched for wrong inclusions. I'm really at the end of my knowledge here, and also searched for posts that would help me, but those were mostly "where is the linker path" or "inclusion of .c files". It seems so an simple problem which i overlooked.
Any help Would be appriciated. I will supply more details if needed.
Thanks!
Edit (2):
obj\Debug\open62541.o:open62541.c:(.text+0x3152a): undefined reference to `__imp_shutdown'
obj\Debug\open62541.o:open62541.c:(.text+0x3153f): undefined reference to `__imp_closesocket'
obj\Debug\open62541.o:open62541.c:(.text+0x315a7): undefined reference to `__imp_send'
obj\Debug\open62541.o:open62541.c:(.text+0x315b9): undefined reference to `__imp_WSAGetLastError'
.....
Edit (3)
Answer 1!
Compiled good now, thanks everyone.
It looks like your library is open62541.
There are two ways to include the library in your source:
Build a shared/static lib and link it to your code
Enable Amalgamation which generates a single .c and .h file which you can directly compile with your code
You are combining both methods on mingw which adds the whole library two times.
Probably you only want to link the .c file without the .lib, thus your compile command should look something like this:
gcc -sdt=c99 main.c open62541.c -o test
Additionally, since open62541 needs the ws2_32 library on windows, the compiler should be called with:
gcc -std=c99 main.c open62541.c -o test -lws2_32
I am trying to compile a Matlab mex program that uses openmp on a mac. I would like to distribute this to other Matlab users so that they can use it, without them needing to install other software.
From what I can tell, xcode doesn't allow this, so I've installed gcc. I am able to compile the program fine, and run it locally, but it links to dependencies that are not available by default on a mac (I think). In particular, otool points to libgomp.1.dylib and libgcc_s.1.dylib, which from what I can tell, are not a part of the standard os installation.
I am able to link against libgomp.a statically, which from some testing (renaming the .dylib file) seems to have properly removed that dependency (i.e. the code still works when I rename the dylib file, and otool does not list it as well). However, I am unsure how to remove the libgcc_s.1.dylib dependency. In windows, copying the dll locally would fix the issue, but this doesn't work on a mac. I could not find a static library for that dependency. Instead, I am trying to get some version of rpath working (with a locally copied file), but otool consistently points to /usr/local/opt/gcc/lib/gcc/6/libgcc_s.1.dylib
The relevant parts of the Matlab command were:
'LDFLAGS="$LDFLAGS -fopenmp -Wl,-rpath,$ORIGIN/"' and
'-lgcc_s.1'
I found one solution here: Openmp with mex in Matlab on mac
However, for another project, I am using gcc specific commands so I'd really like to get this working with gcc.
So, I had some luck bypassing the mex compiling infrastructure and just passing the commands directly to gcc. To start, I ran what I currently had using the '-v' option to see the commands that Matlab was sending to the compiler. The 4 edits I then made were, 1) removed the crazy object output paths that Matlab creates (uses some temporary folder) 2) removed the reference to xcode 3) added a -L directive to the mex folder (although I will probably change this to the proper gcc directory - I'm just used to copying files locally to compile due to Matlab problems) and 4) added '-static-libgcc' (which I swear I had tried before ...) oh, and 5) I also updated the min osx version
This is the final line, the first two just had the -o options removed
/usr/local/Cellar/gcc/6.3.0_1/bin/gcc-6 -Wl,-twolevel_namespace -static-libgcc -L"/Users/jim/Documents/repos/matlab_git/matlab_sl_modules/plotBig_Matlab/+big_plot/private" -undefined error -arch x86_64 -mmacosx-version-min=10.12 -bundle -Wl,-exported_symbols_list,"/Applications/MATLAB_R2017a.app/extern/lib/maci64/mexFunction.map" -fopenmp reduce_to_width_mex.o c_mexapi_version.o -O -Wl,-exported_symbols_list,"/Applications/MATLAB_R2017a.app/extern/lib/maci64/c_exportsmexfileversion.map" libgomp.a -L"/Applications/MATLAB_R2017a.app/bin/maci64" -lmx -lmex -lmat -lc++ -o reduce_to_width_mex.mexmaci64
Oh and finally I should mention I just ran these commands in the terminal, rather than in the Matlab command window ...
I have a JNI project, which I have to make work on Windows (I am working on Linux). This project actually depends on third-party library file which is static (archived i.e .a files). I am trying to create a JNI shared library file using i686-w64-mingw32-g++ and including -static followed by static third-party library name. Following is the command I am using
i686-w64-mingw32-g++ -v -L./ -L/home/user/jre1.8.0_40/lib/amd64/ -I/user/all/apps/Linux2/x86_64/gcc/4.8.2/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.8.2/include -shared -o test.dll test.cpp -lstdc++ -static -thirdparty
In-spite of placing the third party library in the current working directory, I keep getting error
/user/all/apps/Linux2/src/mxe/2013_12_03/usr/bin/../lib/gcc/i686-w64-mingw32/4.8.1/../../../../i686-w64-mingw32/bin/ld: cannot find -thirdparty
Please note : I included -I/user/all/apps/Linux2/x86_64/gcc/4.8.2/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.8.2/include to avoid the error cannot find jni.h which I hit before including the path.
I also tried to compile using gcc, in place of g++.
Do I need to create .dll of this third-party library(currently it is archived .a containing .obj files)?
Being a newbie in cross compilers, I might be doing something wrong. Please correct me and any suggestions with this will be very helpful. Thank you.
-Wl,--export-all-symbols -Wl,--add-stdcall-alias -v adding this solved my problem
I am trying to compile a program which includes the graphics.h header file for C. I have added the graphics.h and winbgim.h header files in the include folder and also libbgi.a to lib folder.
Just for testing, I made a simple hello world program and included the graphics.h header file.
But on compiling I got the following error:
In file included from firstc.c:2:0:
c:\mingw\bin../lib/gcc/mingw32/4.7.1/../../../../include/graphics.h:30:59:
fatal error: sstream: No such file or directory compilation
terminated.
I tried to search in other forums as well, where the same question had been asked, but could not get an answer.
Another question, I came across other graphic options for C and C++ like openGL and DirectX. Should I learn these instead of graphics.h?
graphics.h is a non-standard header. Most likely it refers to the old BGI graphics library of the Turbo C DOS compiler. It will only work on that particular compiler. And of course DOS is a completely obsolete OS nowadays.
If you are interested in 3D graphics programming, then OpenGL and/or DirectX are indeed better, modern alternatives, supported by many compilers.
If you try to compile the source code with including “graphics.h” in code::blocks IDE you have to setup winBGIm library.
Download WinBGIm from http://winbgim.codecutter.org/ or use (direct link)
Extract it.
Open graphics.h, go to line 302 change int right=0 to int top=0
Copy graphics.h and winbgim.h files in include folder of your compiler directory.
Copy libbgi.a to lib folder of your compiler directory
In code::blocks open Settings >> Compiler and debugger >> linker settings
Click Add button in link libraries part, browse and select libbgi.a file
In right part (ie. other linker options) paste commands
-lbgi -lgdi32 -lcomdlg32 -luuid -loleaut32 -lole32
Click Ok
You can also check this video tutorial.
When you're compiling a C source code having graphics.h header file, you'll need to change the file extension to .cpp. Without doing that, you'll get “fatal error: sstream : no such file directory” error.
So, simply change the .c extension to .cpp. Here's a step-by-step procedure to compiling graphics.h source code if you're using Code::Blocks to run the code.
The sstream error occurs only when you are compiling using gcc not g++ , try using g++ or converting the program to c++ , as far as i know ( since i'm new to this language but i've faced this error before ) so goodluck with that
If top answer doesn't work, and you are getting:
error: narrowing conversion of 'x' from 'int' to 'short unsigned int'
your graphics window just doesn't appear
following this tutorial and using the bug fixed headers/libraries (winBGIm(bug-free).rar) in the provided winBGIm source link, worked for me in Windows 10.
Mirror to winBGIm(bug-free_.rar)
compiling with: g++ example.cpp -Wall -m32 -std=c++11 -pedantic -g -lbgi -lgdi32 -lcomdlg32 -luuid -loleaut32 -lole32 -o example.exe
I am getting linking error when I try to compile a test code.
I'm using cygwin on windows 7.
Initial steps like ./configure, make, make test & make install went fine
I'm also able to generate .pb.cc and .pb.h with protoc command.
But when I try to compile my test code, it gets many linking errors. I'm sure those errors are because it is unable to link to library.
Cygwin has protobuf static library and linking library in /usr/local/lib
. include files are present in /usr/local/include
I tried with -lprotobuf, but it returns error saying -lprotobuf not found
It hard to say what the problem is since you don't include neither the makefile nor the errors, but my guess is that the path /usr/local/lib is not included in the search path when looking for libraries.
Try adding -L/usr/local/lib before -lprotobuf.