Is there any command / utlity to generate symbol file (.sym) from executable for MIPS platform?
Did you try to use "nm" command line utility? Is that good enough?
Try to:
nm -C
Related
I'm trying to compile C++ on Windows.
The command needed to compile on Linux is:
g++ -O3 -Wall -shared -std=c++11 -fPIC `python -m pybind11 --includes` EO_functions_bipartite.cpp -o extremal_bi.so
I installed MinGW but when I try to compile I get the following error:
g++.exe: error: python: No such file or directory
g++.exe: error: pybind11: No such file or directory
g++.exe: error: unrecognized command line option '-m'
g++.exe: error: unrecognized command line option '--includes EO_functions_bipartite.cpp'
g++.exe: fatal error: no input files
compilation terminated.
Assuming you have python in your path.
The backtick escape thing that embeds the python -m pybind11 --includes command within the g++ doesn't work on cmd.exe in Windows.
Run the python -m pybind11 --includes command on its own line in the cmd shell. Take the output of that command and substitute in into the g++ command. It should be a bunch of -I include params.
So if the output of the python command is this:
-IC:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.7_3.7.2544.0_x64__qbz5n2kfra8p0\Include -IC:\Users\User\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.7_qbz5n2kfra8p0\LocalCache\local-packages\Python37\site-packages\pybind11\include
Expand your g++ command to be this:
g++ -O3 -Wall -shared -std=c++11 -fPIC "-IC:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.7_3.7.2544.0_x64__qbz5n2kfra8p0\Include" -IC:\Users\User\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.7_qbz5n2kfra8p0\LocalCache\local-packages\Python37\site-packages\pybind11\include EO_functions_bipartite.cpp -o extremal_bi.so
Notice the quotes I put around the first include directory because it has a space in its path.
The easiest way to start on native Windows if you have a Linux background is to install MSYS2 shell with MinGW-w64. This will provide an actual bash that allows you to run commands almost exactly the same way as on Linux, including support for backticks like in the case of your issue.
Though I would always recommend using $( ... ) instead of backticks, as this allows nesting.
Note that MinGW-w64 also exists on Windows to allow cross-building for Windows from Linux, but that may be a bit more difficult if you have never done any cross-building before.
Also -shared ... -o extremal_bi.so in your command should be replaced with -shared ... -o extremal_bi.dll -Wl,--out-implib,libextremal_bi.dll.a as .so files don't exist on Windows as Windows uses .dll files for shared libraries and the compiler uses .dll.a files as library objects for them.
Finally on Windows you need to tell the compiler or linker which symbols you will be exporting by either writing a libextremal_bi.def starting with the line EXPORTS followed all the symbols you want to be exported and include -def libextremal_bi.def in the link command, or using __declspec(dllexport)/__declspec(dllimport) when defining those symbols, which may be a bit complexer as it requires some conditional defines to determine if the code is being compiled for Windows and if it's during the actual build process of the shared library (__declspec(dllexport)) or code that uses it (__declspec(dllimport)). There is also another method to export all symbols, but that's a dirty method that may more easily cause symbol conflicts.
It would be helpful if you could provide some guidance on how to compile c++ source code files in an Ubuntu environment, using the MATLAB Engine with g++.
I assume that you want to know the procedure for compiling the c++ code (which calls MATLAB engine) using g++ from Linux Terminal. To do so, follow the steps below:
Include following paths in PATH variable:
a) Location of MATLAB i.e. $matlabroot/bin
b) $matlabroot/sys/os
You can do this by using the command
'setenv PATH $matlabroot/bin:$matlabroot/sys/os:$PATH ' .
In the command prompt, navigate to the directory where the cpp code is located using cd command. For instance, if you are compiling engdemo.cpp, you need to navigate to $matlabroot/extern/examples/eng_mat/engdemo.cpp
You need to call the compiler with required include files and libraries. For this you can use -I and -L switches for that. Note that the order is important. So you need to use the command as below:
g++ engdemo.cpp -I "$matlabroot/extern/include" -L "$matlabroot/bin/glnxa64" -leng -lmat -lmex -lut -o engdemo.o
The above command will generate an object file engdemo.o. To execute this, use the command ./engdemo.o
You can refer to the document at http://www.umiacs.umd.edu/~jsp/Downloads/MatlabEngine/MatlabEngine.pdf for more help regarding C++ and MATLAB.
The compilation process in C/C++ is divided in two phases:
First, the compilation where source code is transformed into machines code with multiples object files (.o or .obj).
Then, the link to transform object files into a single executable file (.dll or .exe).
C/C++ programs that run matlab engine need three things:
1> A compiler that is compatible with matlab engine.
2> Reference to API header files('.h' for c or '.hpp' for c++) for compilation.
3> Reference to the libraries('.lib' for windows,'.so' for linux) for external symbol link.
You can see comptatible linux based system compiler here.
The GCC C/C++ 4.9.x is compatible so you can use g++.
As this pdf suggested, the API header files should be there $matlabroot/extern/include and the .so files should be in $matlabroot/
bin/glnax64 where $matlabroot is your matlab install folder
Set up Environment variables
Open your temnial with ctrl + alt + T and type :
setenv PATH $matlabroot/bin:$matlabroot/sys/os:$PATH
You can then go to the folder where source file is located, let's say $matlabroot/extern/examples/eng_mat/ with the following command :
cd $matlabroot/extern/examples/eng_mat/
You need to do the compilation with :
g++ -c engDemo.cpp -I '$matlabroot/extern/include' -leng -lmat -lmex -lut
After that, a file named engDemo.o should be created.
The -leng -lmat -lmex -lut options are probably needed among other things because of the usage of the matlab interpreter that should be located in $matlabroot/bin
And the external symbol link with :
g++ -o engDemo -L '$matlabroot/bin/glnax64'
Be careful as this path sugested that you are on a x64 architecture machine, if you are not,the path might be slightly different.
Then you can execute your file just by doing ./engDemo
I can't install the matlab engine on the laptot I am using so I'm unable to test the instruction I gave you but It should be done this way.
Hope it helps !!
I have an .SO file (note, not .a, not .dylib and not .o) and I need to get symbol information from it on OSX.
I have tried
nm -gU lib.so
However, nothing is printed out.
I can't use otool because it's not an object file, and readelf does not exists on OSX. How do I get the symbol information?
Please note, that I am using this .so file in another project, and there is symbol information. I am able to load the library, and reference functions from it. However, I have yet to find a tool on OSX to let me print the symbol information from it.
As asked,
file lib.so
ELF 32-bit LSB shared object, ARM, version 1 (SYSV), dynamically linked, stripped
Try using c++filt piped from nm:
nm lib.so | c++filt -p -i
c++filt - Demangle C++ and Java symbols.
-p
--no-params
When demangling the name of a function, do not display the types of
the function's parameters.
-i
--no-verbose
Do not include implementation details (if any) in the demangled
output.
EDIT: Based upon the new (ARM) info provided in the question, try using symbols instead:
symbols lib.so -arch arm | awk '{print $4}'
I've used awk to simplify output; remove to output everything.
Manual page : Symbols
https://developer.apple.com/legacy/library/documentation/Darwin/Reference/ManPages/man1/nm.1.html
Nm displays the name list (symbol table) of each object file in the argument list. If an argument is
an archive, a listing for each object file in the archive will be produced. File can be of the form
libx.a(x.o), in which case only symbols from that member of the object file are listed. (The paren-
theses have to be quoted to get by the shell.) If no file is given, the symbols in a.out are listed.
I am running the arm-eabi-addr2line for my Android project, my command is
/Applications/android-sdk-mac_86/android-ndk-r5b/toolchains/arm-eabi-4.4.0/prebuilt/darwin-x86/bin/arm-eabi-addr2line -C -f -e {my so file} {address}
and found that it always only return the function name but don't show line number, e.g,
XXX::XXX::XXX()
??:0
any idea?
Do you have debugging symbols in your .so? You should also disable optimization (-O0) and inline functions (-fno-inline)
Can you please tell me how can I dump all the symbols in a .a file on MacOS X?
I am getting a linking error while compiling my c++ problem on MacOS X. I would like to find out if the sybmols exists on the .a file that I am linking with.
Thank you.
man nm
Nm displays the name list (symbol
table) of each object file in the
argument list. If an argument is an
archive, a listing for each object
file in the archive will be produced.
File can be of the form libx.a(x.o),
in which case only symbols from that
member of the object file are listed.
... etc
nm -g | c++filt
Mac nm doesn't have the demangle option, so you just run the output through c++filt (a demangler) afterwards.