I am working on RHEL 7.5 and trying to compile a uWebSocket (This exaple) code. I clone the project and open it. When I start make on Makefile I got this error;
BroadcastingEchoServer uSockets/*.o -lz;
g++: error: unrecognized command line option '-std=c++17'
make: [examples] Error 1>
The main problem is -std=c++17 is not recognized. How can I control what c++ version I have (that 17 in the end) and how can I install required version.
gcc --version
gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-39)
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Thanks
RHEL is providing newer versions of GCC additionally using socalled Software Collections (SCL). In your case you could enable this repository (depending whether you have a workstation or a server subscription):
subscription-manager repos --enable rhel-server-rhscl-7-rpms
subscription-manager repos --enable rhel-workstation-rhscl-7-rpms
Afterwards you could install one (or multiple) of the following packages:
yum install devtoolset-6-gcc-c++ (GCC 6.3.1, until RHEL 7.7)
yum install devtoolset-7-gcc-c++ (GCC 7.3.1)
yum install devtoolset-8-gcc-c++ (GCC 8.3.1)
yum install devtoolset-9-gcc-c++ (GCC 9.3.1, since RHEL 7.7)
yum install devtoolset-10-gcc-c++ (GCC 10.2.1, since RHEL 7.9)
yum install devtoolset-11-gcc-c++ (GCC 11.2.1, since RHEL 7.9)
Note that you can install the whole devtoolset of a specific version using e.g. yum install devtoolset-11-toolchain. This might be needed (or not) depending on your specific usecase.
Once installed, run e.g. scl enable devtoolset-11 bash when you installed devtoolset-11-gcc-c++. Calling g++ will then lead to GCC 11.2.1. For scripts, using . /opt/rh/devtoolset-11/enable before using g++ might be more convenient.
If needed, see How can I make a Red Hat Software Collection persist after a reboot/logout? in the Red Hat Knowledgebase.
gcc (GCC) 4.8.5
C++17 is not supported by GCC v4.8.
C++17 is not supported by GCC v4.9.
C++17 is supported by GCC v5, but you need -std=c++1z:
The next revision of the ISO C++ standard, tentatively planned for 2017. Support is highly experimental, and will almost certainly change in incompatible ways in future releases.
GCC v5 was released 2015 and they did not yet have time machines back then ;o)
Same applies to GCC v6 and GCC v7 (released 2016 and 2017).
C++17 is supported by GCC v8 by means of -std=c++17 (and by -std=c++1z which is deprecated since then).
For the GNU-C++ dialects, use -std=gnu++* instead of -std=c++*.
Hence for serious projects, you should use GCC v8 or newer.
Use:
yum install devtoolset-9-toolchain
scl enable devtoolset-9 bash
My build fails with the following linker error message:
FAILED: : && /usr/bin/g++ -Wall -Wextra -Werror -g -fsanitize=undefined,address -Wno-unused-parameter -fsanitize=undefined,address -rdynamic *.o -o SCE -Wl,-rpath,/opt/qt59/lib /opt/qt59/lib/libQt5Widgets.so.5.9.1 /usr/local/lib/libprotobuf.a -lpthread -lutil -lgrpc++ /opt/qt59/lib/libQt5Gui.so.5.9.1 /opt/qt59/lib/libQt5Core.so.5.9.1 && :
/usr/bin/x86_64-linux-gnu-ld: unrecognized option '--push-state--no-as-needed'
You can see the full build log here. The error is in line 2211 and versions are printed in lines 2104ff.
Which tool causes the error?
Is gcc 7.3.0 using an incorrect linker flag? The ld documentation indicates that --push-state and --no-as-needed are separate commands.
Is ld 2.28 too old to understand the linker flag? The change log doesn't list anything that seems related.
The command && /usr/bin/g++ looks odd, it should be /usr/bin/g++. Using make instead of ninja shows the same linking error.
It builds correctly on Debian testing which is using gcc 7.3.0 as well and ld 2.30, but there doesn't seem to be a working binutils-2.30 ppa for Ubuntu Trusty.
How do I successfully build my project on Travis?
GCC 7 is fixed with 7.3.0-16ubuntu3 (tested on Ubuntu 18.04). This version is available though the Ubuntu Toolchain Test PPA (for 16.04.1 and 14.04).
Tested with Make only, but it should work with Ninja too. Both Sanitizer, ASan and UBsan, enabled.
There's not much related to this problem in the changelog though:
gcc-7 (7.3.0-16ubuntu3) bionic; urgency=medium
Update to SVN 20180415 (r259389) from the gcc-7-branch.
Fix PR libstdc++/85222.
Remove our own PR libstdc++/85222 backport.
Update:
GCC 7 (7.3.0-16ubuntu3) is still broken on Ubuntu 16.04 and earlier.
What you can do to workaround this:
A. Update to Ubuntu 18.04
The problem is fixed on Ubuntu 18.04 (LTS)'s Gcc7.
B. Dockerize and update to Ubuntu 18.04
If an update is not possible, eg. running on a CI system, it's still an option to use Docker and an up-to-date Ubuntu.
C. Disable UB Sanitizer
The Problem occurs only when using GCC7 with UB Sanitizer enabled. As tobias-brüll noted in the comments: Turning the UB Sanitizer off prevents the error.
D. Use Gold Linker
Another workaround posted by makerj: Using the Gold Linker doesn't cause the problem.
Eg. on CMake pass it through the CMAKE_EXE_LINKER_FLAGS:
cmake -DCMAKE_EXE_LINKER_FLAGS=-fuse-ld=gold ..
If option D (from ollo's answer) is not working for you try next commands:
sudo add-apt-repository ppa:jonathonf/binutils --yes
sudo apt-get update -qq --yes
sudo apt-get install -qq --yes --force-yes binutils
This is from: https://github.com/Project-OSRM/osrm-backend/blob/master/scripts/travis/before_install.x86_64-asan.sh
And the issue was discribed here: https://github.com/Project-OSRM/osrm-backend/issues/3216
I have XCode installed (Version 7.2.1 (7C1002)) in Yosemite and have downloaded and installed command line tools. When I try to check the gcc version I get:
$ gcc -v
Segmentation fault: 11
$
The output for:
$ type -a gcc
gcc is /usr/local/bin/gcc
gcc is /usr/bin/gcc
$
From what I understand, that should mean that I have it installed so I still don't understand why I can't check it's version. Since I will need gcc for other applications I would like to have it fixed...any suggestions? Do I need to link it somehow?
You have a faulty third-party version of gcc (or perhaps another compiler masquerading as gcc) installed in /usr/local. This may be something put there by Homebrew or maybe you installed this build of gcc yourself or something.
A short-term fix would be to modify your PATH environment variable so that /usr/bin comes before /usr/local/bin. Or, you could just always specify the full path to gcc, such as /usr/bin/gcc -v.
Longer term, you probably want to remove the broken gcc that's been installed to /usr/local. How you do that exactly depends on how you originally installed it there.
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