GCC version must be at least 5.1! but gcc 6.3.0

[iamjenechka]

gcc --version
gcc (Gentoo 6.3.0 p1.0) 6.3.0
Copyright (C) 2016 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.

cmake .
CMake Error at CMakeLists.txt:27 (message):
GCC version must be at least 5.1!

-- Configuring incomplete, errors occurred!
See also "/home/jim/monero/xmr-stak-cpu/CMakeFiles/CMakeOutput.log".

[psychocrypt]

Please post the full cmake output plus the output of g++ --version
It looks like your c++ compiler is not 5.x

[iamjenechka]

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Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" succeeded.
Compiler: /usr/bin/c++
Build flags:
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The output was:
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Compilation of the CXX compiler identification source "CMakeCXXCompilerId.cpp" produced "a.out"

The CXX compiler identification is GNU, found in "/home/jim/monero/xmr-stak-cpu/CMakeFiles/3.8.0/CompilerIdCXX/a.out"

Determining if the C compiler works passed with the following output:
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[iamjenechka]

Hm... it looks like it still using 4.9.3?

[iamjenechka]

I'm done here. some magic with env-update && source /etc/profile and -DCMAKE_CC_COMPILER=gcc6

[waffles702]

So what was fix? @jimisan im having this issue currently.

[iamjenechka]

env-update && source /etc/profile;
compiled with -DCMAKE_CC_COMPILER=gcc6 option.

[foice]

The key is to force the compiler choices
cmake -DCMAKE_CXX_COMPILER=g++-6.1.0 -DCMAKE_C_COMPILER=gcc-6.1.0 .

[liuyes]

CentOS 6

sudo wget -O /etc/yum.repos.d/ https://copr.fedoraproject.org/coprs/hhorak/devtoolset-4-rebuild-bootstrap/repo/epel-6/hhorak-devtoolset-4-rebuild-bootstrap-epel-6.repo
sudo yum install centos-release-scl cmake3 hwloc-devel libmicrohttpd-devel openssl-devel
sudo yum install devtoolset-4-gcc*
sudo scl enable devtoolset-4 bash
cmake3 -DCMAKE_CC_COMPILER=gcc5/6 .
make install

CentOS 7

sudo wget -O /etc/yum.repos.d/ https://copr.fedoraproject.org/coprs/hhorak/devtoolset-4-rebuild-bootstrap/repo/epel-7/hhorak-devtoolset-4-rebuild-bootstrap-epel-7.repo
sudo yum install centos-release-scl cmake3 hwloc-devel libmicrohttpd-devel openssl-devel
sudo yum install devtoolset-4-gcc*
sudo scl enable devtoolset-4 bash
cmake3 -DCMAKE_CC_COMPILER=gcc5/6 .
make install

http://blog.csdn.net/force_eagle/article/details/50474355

[ghost]

cmake -DCMAKE_CXX_COMPILER_VERSION=6.3.0

[malsony]

Here's what I've done and fixed in CentOS 7.4:

wget https://ftp.gnu.org/gnu/gcc/gcc-8.1.0/gcc-8.1.0.tar.gz
tar -xzf gcc-8.1.0.tar.gz
mkdir gcc-8.1.0-build
../gcc-8.1.0/configure --enable-languages=c,c++ --disable-multilib
make -j$(nproc) && make install

This process will finish in a long time. GCC will be installed in somewhere under /usr/local, and you need to take one more step, create a symbolic link named 8.1.0 in the directory /usr/lib/gcc/x86_64-redhat-linux, pointing to the install path.

Reference:

https://jdhao.github.io/2017/09/04/install-gcc-newer-version-on-centos/

After installing newer version of gcc, temporary specify the location of it:

export CC=/usr/local/bin/gcc
export CXX=/usr/local/bin/g++