I need to use fortran so I have installed gcc from homebrew
brew install gcc
i couldn't compile my source code so i tried to reinstall
Warning: gcc-6.2.0 already installed, it's just not linked
so i tried to link it
brew link gcc
with this result
Error: Could not symlink bin/gfortran
Target /usr/local/bin/gfortran
already exists. You may want to remove it:
rm '/usr/local/bin/gfortran
so i tried this
brew link --overwrite gcc
which gave me this result
Error: Could not symlink include/c++/6.2.0
/usr/local/include/c++ is not writable.
As i am pretty new to this I'm now stuck but i desperately need to resolve this so i can continue my uni work at home, please help
Related
I have downloaded GMP 6.2.1 from the link supplied from the website to my macos Big Sur, unzipped it. I runned the configure script and
make check
make install
then realized I should have added --enable-cxx to ./configure --enable-cxx. I did that and rerun make check.
Error I've got is
libtool: warning: '-no-install' is ignored for broadwell-apple-darwin20.5.0
libtool: warning: assuming '-no-fast-install' instead
libtool: error: cannot find the library '../libgmp.la' or unhandled argument' ../libgmp.la'
How can I solve this?
I followed the instructions from https://gmplib.org/manual/Installing-GMP correctly the first time but the second time I didn't run make before make check. Following the manual exactly solved my problem.
I had to downgrade my GCC to version 4.7 because I had this kind of problem when compiling matConvnet
Warning: You are using gcc version '5.4.0'. The version of gcc is not supported. The version currently supported with MEX is '4.7.x'. For a list of currently supported compilers see: http://www.mathworks.com/support/compilers/current_release.
So, I did the following steps to make GCC 4.7.0 the default compiler of my machine:
sudo apt-get install gcc-4.7
sudo rm /usr/bin/gcc
ln -s /usr/bin/gcc-4.7 /usr/bin/gcc
However, when I try to compile Matconvnet again I had the following error:
Error using vl_compilenn>mex_compile (line 434)
No supported compiler or SDK was found. For options, visit http://www.mathworks.com/support/compilers/R2016a/glnxa64.html.
Error in vl_compilenn (line 387)
parfor i = 1:numel(horzcat(lib_src, mex_src))
What I missed in my procedure?
EDIT: I realized that the problem is with the g++ compiler
when I do the mex -setup C++ command in MATLAB I have this error:
Error using mex
No supported compiler or SDK was found. For options, visit http://www.mathworks.com/support/compilers/R2016a/glnxa64.html.
When I do the which g++ command it returns me nothing. When I apt-get install g++ the following returns to me:
g++ is already the newest version (4:5.3.1-1ubuntu1).
What I can do to make MATLAB recognize my g++ compiler?
It's probably way to late for an answer, but when I had a similar problem, the following seemed to be the solution:
sudo apt-get install --reinstall gcc
sudo apt-get install --reinstall g++
Hope it helps everyone who stumbles upon this.
I'm getting an ld error when attempting to compile an sfml program on ubuntu 16.04. This is apparently a known issue, and there is supposed to be a workaround, but I don't understand what is it...
http://web.archive.org/web/20160509014317/https://gitlab.peach-bun.com/pinion/SFML/commit/3383b4a472f0bd16a8161fb8760cd3e6333f1782.patch
The error spat out by ld is
hidden symbol `__cpu_model' in /usr/lib/gcc/x86_64-linux-gnu/4.9/libgcc.a(cpuinfo.o) is referenced by DSO
There is no relevant code to this - as I understand it this error is produced on all ubuntu 16.04 systems with g++ 5, if the program to be linked contains objects such as sf::Texture and sf::Sprite. (I don't know any more detail than this.)
I have tried also compiling with g++ 4.9, but the same error occurs.
My compile line is g++-4.9 --std=c++11 -Wall main.cpp -lsfml-graphics -lsfml-window -lsfml-system -o a.out
Has anyone else experienced this error and resolved it successfully?
I've had to fix this issue several times. Instead of applying the patch, you can manually fix it by editing the file SFML/src/SFML/Graphics/CMakeLists.txt. At line 149, you will find the following:
if(SFML_COMPILER_GCC)
set_source_files_properties(${SRCROOT}/ImageLoader.cpp PROPERTIES COMPILE_FLAGS -fno-strict-aliasing)
endif()
After the endif(), insert the following:
if(SFML_COMPILER_GCC AND BUILD_SHARED_LIBS)
list(APPEND GRAPHICS_EXT_LIBS "-lgcc_s -lgcc")
endif()
Then, in the top-level SFML folder, run the following:
mkdir build && cd build
cmake .. -DSFML_BUILD_EXAMPLES=ON -DSFML_BUILD_DOCS=ON
make
sudo make install
sudo ldconfig
This will get it built and installed without the compiler error. (Note: Remove the -D flags from cmake if you don't want docs or examples)
I ran this in the SFML source directory before running the standard cmake...make:
curl https://gitlab.peach-bun.com/pinion/SFML/commit/3383b4a472f0bd16a8161fb8760cd3e6333f1782.patch \
| patch -p1
and that solved the problem
I've got the same linker error when trying to build SFML 2.4.2 with examples, specifically with opengl and shader ones.
Inspired by the #Joshua solution, I tried to change the compiler from GCC to Clang. It worked.
I am sharing here because it seems to be a simpler solution if you have no restrictions to use Clang.
Just download SFML and change to its directory. And...
mkdir build && cd build
cmake .. -DSFML_BUILD_EXAMPLES=ON -DCMAKE_CXX_COMPILER=clang++
make
sudo make install
sudo ldconfig
Removing -fvisibility=hidden from compiler options worked for me.
I am trying to link boost::asio using terminal (I'm also using a text editor).
What I tried
I did some researches on Internet (I didn't found nothing about my distro) - I found I must install that library by executing the following command on the terminal:
sudo pacman -S libboost-all-dev
This is the output I get:
error: the following package was not found: libboost-all-dev
Final question
How can I install and link correctly boost::asio with my .cpp file?
Notes:
I'm using Archlinux
To find a package in Arch Linux, do:
sudo pacman -Ss boost
This will list packages with the string boost. Or, you can look up on the package website: https://www.archlinux.org/packages/extra/x86_64/boost/
One thing you should understand about boost is that a majority of its modules are header-only; if the linker complains about undefined references then you would have to link the required files. To link boost-asio, you would do
g++ -lboost-system <source> <exe>
How to install boost in Arch Linux
You cannot link libraries inside your *.cpp files. You should enumerate required libraries using the -l option in the g++ command line.
g++ -lboos-asio -lboost-system myfile.cpp -o myapp
$ gcc 12.c -fopenmp
12.c:9:9: fatal error: 'omp.h' file not found
#include<omp.h>
^
1 error generated.
While compiling openMP programs I get the above error. I am using OS X Yosemite. I first tried by installing native gcc compiler by typing gcc in terminal and later downloaded Xcode too still I got the same error. Then I downloaded gcc through:
$ brew install gcc
Still I'm getting the same error. I did try changing the compiler path too still it shows:
$ which gcc
/usr/bin/gcc
So how do I compile programs with gcc?
EDIT: As of 13 Aug 2017 the --without-multilib option is no longer present in Homebrew and should not be used. The standard installation
brew install gcc
will provide a gcc installation that can be used to compile OpenMP programs. As below it will be installed into /usr/local/bin as gcc-<version>. The current gcc version available from Homebrew (as of writing) will install as gcc-8. You can compile programs with OpenMP support using it via
gcc-8 -fopenmp hello.c
Alternatively you could put an alias in your .bashrcfile as
alias gcc='gcc-8'
and then compile using
gcc -fopenmp hello.c
Note: I'm leaving the original post here in case it is useful to somebody.
The standard gcc available on OS X through XCode and Clang doesn't support OpenMP. To install the Homebrew version of gcc with OpenMP support you need to install it with
brew install gcc --without-multilib
or as pointed out by #Mark Setchell
brew reinstall gcc --without-multilib
This will install it to the /usr/local/bin directory. Homebrew will install it as gcc-<version> so as not to clobber the gcc bundled with XCode.
I finally did some research and I finally came across a solution here: <omp.h> library isn't found in the GCC version (4.2.1) in Mavericks.
I got a new gcc complier from http://hpc.sourceforge.net/
Then I placed a new executable folder by
$ sudo tar -xvf gcc-4.9-bin.tar -C /
Later I switched to it by
export PATH=/usr/local/bin:$PATH that seemed to do the trick!