When I check the version of clang
❯ clang --version
Apple clang version 14.0.0 (clang-1400.0.29.202)
Target: arm64-apple-darwin22.3.0
when I check the version of gcc
❯ gcc --version
Apple clang version 14.0.0 (clang-1400.0.29.202)
Target: arm64-apple-darwin22.3.0
Here I am not able to use the gcc compiler that I installed using homebrew
❯ ls -l /opt/homebrew/Cellar/gcc
total 0
drwxr-xr-x 15 kumar admin 480 Feb 5 20:30 12.2.0
Please tell me how can I use the gcc(installed using Homebrew) for running any c program.
When I compile any program by writing gcc hello.c ,Then it is similar to clang hello.c Whereas I want to compile the file hello.c with the gcc that is installed using homebrew at /opt/homebrew/Cellar/gcc
You can't "run" any program using gcc, you can only compile and link using gcc.
Your shell determines which program to run according to your PATH. If your PATH contains /usr/bin before /opt/homebrew/bin then you will be running Apple's gcc rather than the homebrew one. You can check your PATH with:
echo $PATH
You can check which gcc will be run when you type gcc without a path by running:
type gcc
Pretty much all homebrew packages link their binaries into /opt/homebrew/bin, so firstly you should set your PATH like this:
export PATH=/opt/homebrew/bin:PATH
That makes your shell look for homebrew packages before Apple ones. You should do that in your login profile so it is set every time you login.
Then you need to check what name your homebrew GCC package has installed gcc under, it might be gcc-10 or gcc-11. You can check with:
ls /opt/homebrew/bin/gcc*
If it is gcc-11, you would compile with:
gcc-11 -o prog program.c
Note that if your code is C++, you will need:
g++-11 -o prog program.cpp
Since upgrading to Yosemite I cannot compile with gfortran. Initially I was getting "segmentation fault 11", then I:
Updated to gcc v.5.0 from http://hpc.sourceforge.net/
Re-installed Xcode command line utilities v.6.1.1
After doing the above, I am able to compile very simple fortran programs but the more complex code that I run gives me the following error:
gfortran: error: libgfortran.spec: No such file or directory
But in fact, the libgfortran.spec file is located in /usr/local/lib
ls /usr/local/lib | grep gfortran
libgfortran.3.dylib
libgfortran.a
libgfortran.dylib
libgfortran.la
libgfortran.spec
All of the gcc binaries are located in /usr/local/bin
which gfortran
/usr/local/bin/gfortran
And my path seems to be OK
echo $PATH
/usr/local/lib:/usr/local/bin:/usr/local:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/lib:/usr/texbin:/Users/MattCooper/bin:/Applications/MRT/bin
I also tried re-installing gcc with homebrew:
brew install gcc
Error: gcc-4.9.2 already installed
To install this version, first 'brew unlink gcc'
However, I get v. 5.0 when I ask 'gcc --version':
gcc --version
gcc (GCC) 5.0.0 20141005 (experimental)
When I try to unlink or upgrade gcc with homebrew I get a permission denied error:
brew unlink gcc
Unlinking /usr/local/Cellar/gcc/4.9.2... Error: Permission denied - /usr/local/bin/c++-4.9
similarly
brew upgrade gcc
Permission denied - /usr/local/bin/c++-4.9
Finally
which gcc
/usr/local/bin/gcc
Please help. Many thanks ahead of time. Please let me know what I've forgotten to include.
I ended up solving the problem via homebrew. I can't pinpoint the exact source of the problem but it was related to the fact that I installed gcc v4.9 from http://hpc.sourceforge.net/, then somewhere along the way I re-installed and/or updated gcc with homebrew. Then, after upgrading to Yosemite, I installed gcc v5 from http://hpc.sourceforge.net/. Somewhere within that process, the binaries within /usr/local/bin and usr/local/lib were not linked properly.
The main clue was the Permission Denied error when trying to run 'brew upgrade gcc'. I found a solution here: Brew doctor says: "Warning: /usr/local/include isn't writable."
To fix, I used:
brew doctor
which returned a bunch of directories that were not writeable, for example usr/local/lib, thus brew was unable to ugrade gcc to the v5.0 and link everything.
I went through and issued:
sudo chown -R $USER /usr/local
and did this for all of the other non-writeable directories returned by 'brew doctor'. Then, I was able to use brew to ugrade gcc:
brew upgrade gcc
During the ugrade, homebrew returned an error that stated it could not finish the upgrade because there was already an existing gfortran file located in:
/usr/local/bin/gfortran
To fix, homebrew suggested I run:
brew -link gcc
at which point everything worked. Interesting (to me, because I don't fully understand all of this) when I ask brew to clean things up, I get:
brew cleanup
Warning: Skipping (old) /usr/local/Cellar/gcc/4.9.2 due to it being linked
There's some similar information located here: How to link to a new gcc version with brew?
Similar to that user, when I look in my cellar, I find two versions of gcc, but I'm not sure if I need both
ls /usr/local/Cellar/gcc
4.9.2 4.9.2_1
I had a similar issue with similar solution. It could not find this file:
gfortran: error: libgfortran.spec: No such file or directory
So my problem was that I had installed gcc through hpc.sourceforge.net and through homebrew. I had to uninstall the homebrew version
brew uninstall gcc
Then I had to reinstall the gcc from hpc.sourceforge.net
sudo tar -xvf gcc-4.9-bin.tar.gz -C /
This worked for me when I wanted to revert to gcc 4.9 from hpc.sourceforge.net, using Yosemite.
I have troubles compiling some of the examples shipped with CUDA SDK.
I have installed the developers driver (version 270.41.19) and the CUDA toolkit,
then finally the SDK (both the 4.0.17 version).
Initially it didn't compile at all giving:
error -- unsupported GNU version! gcc 4.5 and up are not supported!
I found the line responsible in 81:/usr/local/cuda/include/host_config.h and changed it to:
//#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ > 4)
#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ > 6)
from that point on I got only a few of the examples to compile, it stops with:
In file included from /usr/include/c++/4.6/x86_64-linux-gnu/bits/gthr.h:162:0,
from /usr/include/c++/4.6/ext/atomicity.h:34,
from /usr/include/c++/4.6/bits/ios_base.h:41,
from /usr/include/c++/4.6/ios:43,
from /usr/include/c++/4.6/ostream:40,
from /usr/include/c++/4.6/iterator:64,
from /usr/local/cuda/include/thrust/iterator/iterator_categories.h:38,
from /usr/local/cuda/include/thrust/device_ptr.h:26,
from /usr/local/cuda/include/thrust/device_malloc_allocator.h:27,
from /usr/local/cuda/include/thrust/device_vector.h:26,
from lineOfSight.cu:37:
/usr/include/c++/4.6/x86_64-linux-gnu/bits/gthr-default.h:251:1: error: pasting "__gthrw_" and "/* Android's C library does not provide pthread_cancel, check for
`pthread_create' instead. */" does not give a valid preprocessing token
make[1]: *** [obj/x86_64/release/lineOfSight.cu.o] Error 1
As some of the examples compile I reckon this is not a driver problem, but rather must have something to do with an unsupported gcc version. Downgrading is not an option as gcc4.6 has a whole system as a dependency at this point...
As already pointed out, nvcc depends on gcc 4.4. It is possible to configure nvcc to use the correct version of gcc without passing any compiler parameters by adding softlinks to the bin directory created with the nvcc install.
The default cuda binary directory (the installation default) is /usr/local/cuda/bin, adding a softlink to the correct version of gcc from this directory is sufficient:
sudo ln -s /usr/bin/gcc-4.4 /usr/local/cuda/bin/gcc
Check the maximum supported GCC version for your CUDA version:
CUDA version
max supported GCC version
12
12.1
11.4.1+, 11.5, 11.6, 11.7, 11.8
11
11.1, 11.2, 11.3, 11.4.0
10
11
9
10.1, 10.2
8
9.2, 10.0
7
9.0, 9.1
6
8
5.3
7
4.9
5.5, 6
4.8
4.2, 5
4.6
4.1
4.5
4.0
4.4
Set an env var for that GCC version. For example, for CUDA 10.2:
MAX_GCC_VERSION=8
Make sure you have that version installed:
sudo apt install gcc-$MAX_GCC_VERSION g++-$MAX_GCC_VERSION
Add symlinks within CUDA folders:
sudo ln -s /usr/bin/gcc-$MAX_GCC_VERSION /usr/local/cuda/bin/gcc
sudo ln -s /usr/bin/g++-$MAX_GCC_VERSION /usr/local/cuda/bin/g++
(or substitute /usr/local/cuda with your CUDA installation path, if it's not there)
See this GitHub gist for more information on the CUDA-GCC compatibility table.
gcc 4.5 and 4.6 are not supported with CUDA - code won't compile and the rest of the toolchain, including cuda-gdb, won't work properly. You cannot use them, and the restriction is non-negotiable.
Your only solution is to install a gcc 4.4 version as a second compiler (most distributions will allow that). There is an option to nvcc --compiler-bindir which can be used to point to an alternative compiler. Create a local directory and then make symbolic links to the supported gcc version executables. Pass that local directory to nvcc via the --compiler-bindir option, and you should be able to compile CUDA code without affecting the rest of your system.
EDIT:
Note that this question, and answer, pertain to CUDA 4.
Since it was written, NVIDIA has continued to expand support for later gcc versions in newer CUDA toolchain release
As of the CUDA 4.1 release, gcc 4.5 is now supported. gcc 4.6 and 4.7 are unsupported.
As of the CUDA 5.0 release, gcc 4.6 is now supported. gcc 4.7 is unsupported.
As of the CUDA 6.0 release, gcc 4.7 is now supported.
As of the CUDA 7.0 release, gcc 4.8 is fully supported, with 4.9 support on Ubuntu 14.04 and Fedora 21.
As of the CUDA 7.5 release, gcc 4.8 is fully supported, with 4.9 support on Ubuntu 14.04 and Fedora 21.
As of the CUDA 8 release, gcc 5.3 is fully supported on Ubuntu 16.06 and Fedora 23.
As of the CUDA 9 release, gcc 6 is fully supported on Ubuntu 16.04, Ubuntu 17.04 and Fedora 25.
The CUDA 9.2 release adds support for gcc 7
The CUDA 10.1 release adds support for gcc 8
The CUDA 10.2 release continues support for gcc 8
The CUDA 11.0 release adds support for gcc 9 on Ubuntu 20.04
The CUDA 11.1 release expands gcc 9 support across most distributions and adds support for gcc 10 on Fedora linux
There is presently (as of CUDA 11.1) no gcc 10 support in CUDA other than Fedora linux
Note that NVIDIA has recently added a very useful table here which contains the supported compiler and OS matrix for the current CUDA release.
Gearoid Murphy's solution works better for me since on my distro (Ubuntu 11.10), gcc-4.4 and gcc-4.6 are in the same directory, so --compiler-bindir is no help. The only caveat is I also had to install g++-4.4 and symlink it as well:
sudo ln -s /usr/bin/gcc-4.4 /usr/local/cuda/bin/gcc
sudo ln -s /usr/bin/g++-4.4 /usr/local/cuda/bin/g++
If using cmake for me none of the hacks of editing the files and linking worked so I compiled using the flags which specify the gcc/g++ version.
cmake -DCMAKE_C_COMPILER=gcc-6 -DCMAKE_CXX_COMPILER=g++-6 ..
Worked like charm.
For CUDA7.5 these lines work:
sudo ln -s /usr/bin/gcc-4.9 /usr/local/cuda/bin/gcc
sudo ln -s /usr/bin/g++-4.9 /usr/local/cuda/bin/g++
Check out how to use "update-alternatives" to get around this issue:
... If you install gcc 4.6 you can also use the update-alternatives
command to allow for easily switching between versions. This can be
configured with:
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.6 60 --slave /usr/bin/g++ g++ /usr/bin/g++-4.6
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.7 40 --slave /usr/bin/g++ g++ /usr/bin/g++-4.7
sudo update-alternatives --config gcc
On most distributions you have the possibility to install another gcc and g++ version beside a most recent compiler like gcc-4.7. In addition most build systems are aware of the CC and CXX environment variables, which let specify you other C and C++ compilers respectively. SO I suggest something like:
CC=gcc-4.4 CXX=g++-4.4 cmake path/to/your/CMakeLists.txt
For Makefiles there should be a similar way. I do not recommend setting custom symlinks within /usr/local unless you know what you are doing.
This works for fedora 23. The compat gcc repositories will be slightly different based on your version of fedora.
If you install the following repositories:
sudo yum install compat-gcc-34-c++-3.4.6-37.fc23.x86_64 compat-gcc-34-3.4.6-37.fc23.x86_64
Now make the soft links as mentioned above assuming your cuda bin folder is in /usr/local/cuda/
sudo ln -s /usr/bin/gcc-34 /usr/local/cuda/bin/gcc
sudo ln -s /usr/bin/g++-34 /usr/local/cuda/bin/g++
You should now be able to compile with nvcc without the gcc version error.
Gearoid Murphy's solution works like a charm. For me I had two directories for cuda -
/usr/local/cuda
/usr/local/cuda-5.0
The soft links had to be added only to the directory mentioned below -
/usr/local/cuda
Also, both g++ and gcc soft links were required as mentioned by SchighSchagh.
Another way of configuring nvcc to use a specific version of gcc (gcc-4.4, for instance), is to edit nvcc.profile and alter PATH to include the path to the gcc you want to use first.
For example (gcc-4.4.6 installed in /opt):
PATH += /opt/gcc-4.4.6/lib/gcc/x86_64-unknown-linux-gnu/4.4.6:/opt/gcc-4.4.6/bin:$(TOP)/open64/bin:$(TOP)/share/cuda/nvvm:$(_HERE_):
The location of nvcc.profile varies, but it should be in the same directory as the nvcc executable itself.
This is a bit of a hack, as nvcc.profile is not intended for user configuration as per the nvcc manual, but it was the solution which worked best for me.
CUDA is after some header modifications compatible with gcc4.7 and maybe higher version:
https://www.udacity.com/wiki/cs344/troubleshoot_gcc47
For people like me who get confused while using cmake, the FindCUDA.cmake script overrides some of the stuff from nvcc.profile. You can specify the nvcc host compiler by setting CUDA_HOST_COMPILER as per http://public.kitware.com/Bug/view.php?id=13674.
I had to install the older versions of gcc, g++.
sudo apt-get install gcc-4.4
sudo apt-get install g++-4.4
Check that gcc-4.4 is in /usr/bin/, and same for g++
Then I could use the solution above:
sudo ln -s /usr/bin/gcc-4.4 /opt/cuda/bin/gcc
sudo ln -s /usr/bin/g++-4.4 /opt/cuda/bin/g++
In $CUDA_HOME/include/host_config.h, find lines like these (may slightly vary between different CUDA version):
//...
#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ > 9)
#error -- unsupported GNU version! gcc versions later than 4.9 are not supported!
#endif [> __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ > 9) <]
//...
Remove or change them matching your condition.
Note this method is potentially unsafe and may break your build. For example, gcc 5 uses C++11 as default, however this is not the case for nvcc as of CUDA 7.5. A workaround is to add
--Xcompiler="--std=c++98" for CUDA<=6.5
or
--std=c++11 for CUDA>=7.0.
If you encounter this error, please read the log file:
$ cat /var/log/cuda-installer.log
[INFO]: Driver installation detected by command: apt list --installed | grep -e nvidia-driver-[0-9][0-9][0-9] -e nvidia-[0-9][0-9][0-9]
[INFO]: Cleaning up window
[INFO]: Complete
[INFO]: Checking compiler version...
[INFO]: gcc location: /usr/bin/gcc
[INFO]: gcc version: gcc version 9.2.1 20191008 (Ubuntu 9.2.1-9ubuntu2)
[ERROR]: unsupported compiler version: 9.2.1. Use --override to override this check.
Just follow the suggestion in the log file:
sudo sh cuda_<version>_linux.run --override
Job done :)
I just installed CUDA 10.2 with gcc 9.2 on Kubuntu 19.10 using the --override option.
For CUDA 6.5 (and apparently 7.0 and 7.5), I've created a version of the gcc 4.8.5 RPM package (under Fedora Core 30) that allows that version of gcc to be install alongside your system's current GCC.
You can find all of that information here.
To compile the CUDA 8.0 examples on Ubuntu 16.10, I did:
sudo apt-get install gcc-5 g++-5
cd /path/to/NVIDIA_CUDA-8.0_Samples
# Find the path to the library (this should be in NVIDIA's Makefiles)
LIBLOC=`find /usr/lib -name "libnvcuvid.so.*" | head -n1 | perl -pe 's[/usr/lib/(nvidia-\d+)/.*][$1]'`
# Substitute that path into the makefiles for the hard-coded, incorrect one
find . -name "*.mk" | xargs perl -pi -e "s/nvidia-\d+/$LIBLOC/g"
# Make using the supported compiler
HOST_COMPILER=g++-5 make
This has the advantage of not modifying the whole system or making symlinks to just the binaries (that could cause library linking problems.)
This solved my problem:
sudo rm /usr/local/cuda/bin/gcc
sudo rm /usr/local/cuda/bin/g++
sudo apt install gcc-4.4 g++-4.4
sudo ln -s /usr/bin/gcc-4.4 /usr/local/cuda/bin/gcc
sudo ln -s /usr/bin/g++-4.4 /usr/local/cuda/bin/g++
In my case, I had CUDA already installed from the Ubuntu version and cmake would detect that one instead of the newly installed version using the NVidia SDK Manager.
I ran dpkg -l | grep cuda and could see both versions.
What I had to do is uninstall the old CUDA (version 9.1 in my case) and leave the new version alone (version 10.2). I used the purge command like so:
sudo apt-get purge libcudart9.1 nvidia-cuda-dev nvidia-cuda-doc \
nvidia-cuda-gdb nvidia-cuda-toolkit
Please verify that the package names match the version you want to remove from your installation.
I had to rerun cmake from a blank BUILD directory to redirect all the #include and libraries to the SDK version (since the old paths were baked in the existing build environment).
This is happening because your current CUDA version doesn't support your current GCC version. You need to do the following:
Find the supported GCC version (in my case 5 for CUDA 9)
CUDA 4.1: GCC 4.5
CUDA 5.0: GCC 4.6
CUDA 6.0: GCC 4.7
CUDA 7.0: GCC 4.8
CUDA 7.5: GCC 4.8
CUDA 8: GCC 5.3
CUDA 9: GCC 5.5
CUDA 9.2: GCC 7
CUDA 10.1: GCC 8
Install the supported GCC version
sudo apt-get install gcc-5
sudo apt-get install g++-5
Change the softlinks for GCC in the /usr/bin directory
cd /usr/bin
sudo rm gcc
sudo rm g++
sudo ln -s /usr/bin/gcc-5 gcc
sudo ln -s /usr/bin/g++-5 g++
Change the softlinks for GCC in the /usr/local/cuda-9.0/bin directory
cd /usr/local/cuda-9.0/bin
sudo rm gcc
sudo rm g++
sudo ln -s /usr/bin/gcc-5 gcc
sudo ln -s /usr/bin/g++-5 g++
Add -DCUDA_HOST_COMPILER=/usr/bin/gcc-5 to your setup.py file, used for compilation
if torch.cuda.is_available() and CUDA_HOME is not None:
extension = CUDAExtension
sources += source_cuda
define_macros += [("WITH_CUDA", None)]
extra_compile_args["nvcc"] = [
"-DCUDA_HAS_FP16=1",
"-D__CUDA_NO_HALF_OPERATORS__",
"-D__CUDA_NO_HALF_CONVERSIONS__",
"-D__CUDA_NO_HALF2_OPERATORS__",
"-DCUDA_HOST_COMPILER=/usr/bin/gcc-5"
]
Remove the old build directory
rm -rd build/
Compile again by setting CUDAHOSTCXX=/usr/bin/gcc-5
CUDAHOSTCXX=/usr/bin/gcc-5 python setup.py build develop
Note: If you still get the gcc: error trying to exec 'cc1plus': execvp: no such file or directory error after following these steps, try reinstalling the GCC like this and then compiling again:
sudo apt-get install --reinstall gcc-5
sudo apt-get install --reinstall g++-5
Credits: https://github.com/facebookresearch/maskrcnn-benchmark/issues/25#issuecomment-433382510
I have a problem concerning libstdc++.so.
I installed a new version of gcc and tried to compile C++ code. The compiling worked, but when I try to execute the binary (m5.opt is its name) I've got the following error:
build/ALPHA_SE/m5.opt: /usr/lib64/libstdc++.so.6: version `GLIBCXX_3.4.9' not found (required by build/ALPHA_SE/m5.opt).
Do I need to replace libstdc++.so? And if so, where can I download the version I want? On the GCC-website they say libstdc++ is a part of gcc now.
Details
GCC:
I had gcc 4.1.2 before, but I downloaded gcc 4.2.4. From the untarred gcc-directory I executed ./configure; make; sudo make install`.
When I tried to use gcc or g++ to compile, it's default version was still 4.1.2. To overcome this I replaced some links:
mv /usr/bin/gcc /usr/bin/gcc_bak
ln -s /usr/local/bin/gcc gcc
mv /usr/bin/g++ /usr/bin/g++_bak
ln -s /usr/local/bin/g++ g++
GLIBC(++) -- libstdc++:
/usr/lib64/libstdc++.so.6 -> libstdc++.so.6.0.8
/usr/local/lib/libstdc++.so -> libstdc++.so.6.0.9
/lib/libc.so.6 -> libc-2.5.so -> libc-2.5.so
Linux-version:
uname -a gives:
Linux madmax 2.6.18-128.4.1.el5 #1 SMP Tue Aug 4 12:51:10 EDT 2009 x86_64 x86_64 x86_64 GNU/Linux
The problem is that you built your new GCC incorrectly: on Linux you should use
./configure --prefix=/usr
The default installation prefix is /usr/local, which is why make install put gcc and g++ binaries into /usr/local/bin, etc.
What's happening to you now is that you compile and link using the new (symlinked) GCC 4.2.4, but at runtime your program binds to the old /usr/lib64/libstdc++.so.6 (version 6.0.8, instead of required 6.0.9). You can confirm that by running ldd build/ALPHA_SE/m5.opt: you should see that it uses /usr/lib64/libstdc++.so.6.
There are several fixes you could do.
env LD_LIBRARY_PATH=/usr/local/lib64 ldd build/ALPHA_SE/m5.opt
should show you that setting LD_LIBRARY_PATH is sufficient to redirect the binary to correct library, and
LD_LIBRARY_PATH=/usr/local/lib64 build/ALPHA_SE/m5.opt
should just run. You could "bake" this path into m5.opt binary by relinking it with -Wl,-rpath=/usr/local/lib64.
A more permanent solution is to fix the libraries the same way you fixed the binaries:
cd /usr/lib64 && mv libstdc++.so.6 libstdc++.so.6_bak &&
ln -s /usr/local/lib64/libstdc++.so.6 .
An even better solution is to reconfigure the new GCC with --prefix=/usr, and then make all install.
I know this is a very old question, but ...
It's not usually a good idea to replace the system compiler (i.e. the one in /usr) because the entire system will have been built with it and depend on it.
It's usually better to install the new compiler to a separate location and then see the libstdc++ FAQ How do I insure that the dynamically linked library will be found? and Finding Dynamic or Shared Libraries in the manual for how to ensure the correct libstdc++.so is found at runtime.
The other answers here should be fine, but the 'quick and easy' solution if you do happen to have gcc installed to /usr/local/ is to just add the new libs to the LD_LIBRARY_PATH
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib64
You can also check the to see if you have the right versions of GLIBC installed using
strings /usr/lib/libstdc++.so.6 | grep GLIBC
strings /usr/local/lib64/libstdc++.so.18 | grep GLIBC
I got this last tip from another forum so credits due where credits due!