I am trying to compiler FileZilla from its source code.
It requires C++ 14 support for which gcc4.9 is required.
Whatever higher version than 4.8, I try to install, there's no change.
Is gcc4.9 not available for the above ubuntu version?
The error I get is:
checking whether g++ supports C++14 features by default... no
checking whether g++ supports C++14 features with -std=gnu++14... no
checking whether g++ supports C++14 features with -std=gnu++1y... no
checking whether g++ supports C++14 features with -std=c++14... no
checking whether g++ supports C++14 features with -std=c++1y... no
configure: error: *** A compiler with support for C++14 language features is required
Can someone help ?
To install gcc-4.9 g++-4.9 may be helpful, and set it as your default gcc.
sudo add-apt-repository ppa:ubuntu-toolchain-r/test
sudo apt-get update
sudo apt-get install gcc-4.9 g++-4.9
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.9 60 --slave /usr/bin/g++ g++ /usr/bin/g++-4.9
Then gcc-4.9 will be available in your ubuntu version.
Notes : my version is ubuntu 14.04
Related
I am wondering what is the right/easy way to install a binary libc++ on Ubuntu, in my case Trusty aka 14.04?
On the LLVM web site there are apt packages http://apt.llvm.org/ and I have used these to install 3.9. However these packages don't seem to include libc++. I install the libc++-dev package but that seems to be a really old version. There are also binaries that can be downloaded http://llvm.org/releases/download.html#3.9.0. These do seem to contain libc++ but I'm not sure if I can just copy bits of this into places like /usr/include/c++/v1, in fact I'm not really sure what bits I would need to copy. I am aware I can use libc++ from an alternate location as documented here http://libcxx.llvm.org/docs/UsingLibcxx.html which I have tried. However I can't modify the build system of the large code base I work on to do this.
So is three any reason the apt packages don't include libc++ and any pointers to installing a binary would be gratefully recieved.
How to build libc++ on Ubuntu 16.04
I had a similar issue as you do. While testing clang with libstdc++ worked fine with C++11 and C++14 there still might be licensing issues with libstdc++. So I ended up installing Clang toolchain from their repos and compiling libc++ on Ubuntu 16.04.
Disclaimer: This post is summary of long search on how to build the libc++ on Ubuntu Linux. Many of the posts I found in 2017 were either outdated or described a partial solution on other systems e.g. CentOS. Links to these posts are:
Hacking with Clang llvm abi and llvm libc
Building Clang and libc++ on Ubuntu Linux
How to Build libcxx and libcxxabi by clang on CentOS 7
Here are the steps to build LLVM + Clang + libc++ from the 4.0 release branch:
Install the key of LLVM Repositories
# apt-get update && apt-get dist-upgrade -y && apt-get install -y vim curl && \
curl -q https://apt.llvm.org/llvm-snapshot.gpg.key |apt-key add -
Create a new new APT Repository File (you can also exclude 2 lines referring to v3.9 repos)
# cat > /etc/apt/sources.list.d/llvm-repos.list <<EOF
deb http://apt.llvm.org/xenial/ llvm-toolchain-xenial main
deb-src http://apt.llvm.org/xenial/ llvm-toolchain-xenial main
deb http://apt.llvm.org/xenial/ llvm-toolchain-xenial-3.9 main
deb-src http://apt.llvm.org/xenial/ llvm-toolchain-xenial-3.9 main
deb http://apt.llvm.org/xenial/ llvm-toolchain-xenial-4.0 main
deb-src http://apt.llvm.org/xenial/ llvm-toolchain-xenial-4.0 main
EOF
Install Clang and all Packages needed to build libc++ from LLVM repos
# apt-get update && apt-get install -y clang-4.0 clang-4.0-doc \
libclang-common-4.0-dev libclang-4.0-dev libclang1-4.0 libclang1-4.0-dbg \
libllvm4.0 libllvm4.0-dbg lldb-4.0 llvm-4.0 llvm-4.0-dev llvm-4.0-runtime \
clang-format-4.0 python-clang-4.0 liblldb-4.0-dev lld-4.0 libfuzzer-4.0-dev \
subversion cmake
Create an alternative for C++ compiler and linker. This is not a must, but lets you switch compilers or linkers if needed. Also some build files needed cc or c++ or clang++ as far as I remember. Keep in mind, that we switch to LLD linker as default:
update-alternatives --install /usr/bin/cc cc /usr/bin/clang-4.0 100 \
&& update-alternatives --install /usr/bin/c++ c++ /usr/bin/clang++-4.0 100 \
&& update-alternatives --install /usr/bin/clang++ clang++ /usr/bin/clang++-4.0 100 \
&& update-alternatives --install /usr/bin/clang clang /usr/bin/clang-4.0 100 \
&& update-alternatives --install /usr/bin/ld ld /usr/bin/ld.lld-4.0 10 \
&& update-alternatives --install /usr/bin/ld ld /usr/bin/ld.gold 20 \
&& update-alternatives --install /usr/bin/ld ld /usr/bin/ld.bfd 30 \
&& ld --version && echo 3 | update-alternatives --config ld && ld --version
Checkout sources of libc++ and libc++abi:
$ cd /tmp
$ svn co http://llvm.org/svn/llvm-project/libcxx/branches/release_40/ libcxx
$ svn co http://llvm.org/svn/llvm-project/libcxxabi/branches/release_40/ libcxxabi
$ mkdir -p libcxx/build libcxxabi/build
To run libc++ on Linux one needs ABI compatibility to the standard library, e.g. libstdc++. This is where libc++abi comes into game. The only problem is that it needs libc++ to be on the system for which it is build. Thus libc++ is built in 2 steps. First: without any ABI compatibility. But it will be used for bootstrapping of ABI lib and than the second step is to recompile libc++ with the proper ABI present on system:
Bootstraping => build libc++ without proper ABI:
cd /tmp/libcxx/build
cmake -DCMAKE_BUILD_TYPE=Release -DLLVM_CONFIG_PATH=/usr/bin/llvm-config-4.0\
-DCMAKE_INSTALL_PREFIX=/usr .. \
&& make install
Building libc++abi with libstdc++ compatible ABI:
cd /tmp/libcxxabi/build
CPP_INCLUDE_PATHS=echo | c++ -Wp,-v -x c++ - -fsyntax-only 2>&1 \
|grep ' /usr'|tr '\n' ' '|tr -s ' ' |tr ' ' ';'
CPP_INCLUDE_PATHS="/usr/include/c++/v1/;$CPP_INCLUDE_PATHS"
cmake -G "Unix Makefiles" -DLIBCXX_CXX_ABI=libstdc++ \
-DLIBCXX_LIBSUPCXX_INCLUDE_PATHS="$CPP_INCLUDE_PATHS" \
-DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr \
-DLLVM_CONFIG_PATH=/usr/bin/llvm-config-4.0 \
-DLIBCXXABI_LIBCXX_INCLUDES=../../libcxx/include ..
make install
Rebuild libc++ with proper ABI lib deployed on system:
cd /tmp/libcxx/build
cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr \
-DLIBCXX_CXX_ABI=libcxxabi -DLLVM_CONFIG_PATH=/usr/bin/llvm-config-4.0\
-DLIBCXX_CXX_ABI_INCLUDE_PATHS=../../libcxxabi/include .. \
&& make install
Create a test file to check whether everything works fine. IMO you should also test cerr stream, as previously it was not supported with the libc++abi and there were some segfaults. Please refer to this question.
create a test.cpp file:
#include <iostream>
int main()
{
using namespace std;
cout << "[OK] Hello world to cout!" << endl;
cerr << "[OK] Hello world to cerr!" << endl;
clog << "[OK] Hello world to clog!" << endl;
return 0;
}
And compile it and run it using this command line:
clang++ -std=c++11 -stdlib=libc++ -lc++abi test.cpp && ./a.out
Reason there is no package
I found libc++ packages for Ubuntu but they are a bit behind recent version: https://packages.ubuntu.com/xenial/libc++-dev
Why they are not current, I can't answer, but my guess is that LLVM+Clang can work with mostly any Standard Library, whereas libc++ as you see must be linked to particular runtime ABI and might heavily depend on available C runtime library. I agree there should be a package which covers 90% of the cases. May be this is just the lack of resources. Searching the mailing archive did not bring up anything special.
sudo apt-get update
sudo apt-get install libc++-dev
The accepted answer gave me some errors (it is Nov 2021 currently). Also, sudo apt install libc++-dev libc++abi-dev did not provide the latest libc++. Here is an alternate solution.
Use the LLVM apt package maintainer's script:
sudo bash -c "$(wget -O - https://apt.llvm.org/llvm.sh)"
This automatically sets up the apt repositories and gives you the latest LLVM toolchain.
clang-13 --version
Since you now have the latest LLVM packages available from http://apt.llvm.org you can install the latest libc++. First determine the latest version:
apt search libc++ | grep libc++
Then:
sudo apt install libc++-13-dev libc++abi-13-dev
Optionally, you can use update-alternatives to make your system use clang-13 instead of the default. There is a gist for that:
wget https://gist.githubusercontent.com/junkdog/70231d6953592cd6f27def59fe19e50d/raw/update-alternatives-clang.sh
chmod +x update-alternatives-clang.sh
sudo ./update-alternatives-clang.sh 13 1000
Now:
clang --version
Debian clang version 13.0.1-++20211110062941+9dc7d6d5e326-1~exp1~20211110183517.26
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
The easiest way to get a working libc++ is to install the entire 3.9.0 toolchain under /usr/local. This will allow /usr/local/bin/clang++ to find the headers correctly and also allow the linker to find /usr/local/lib/libc++.so.
check my shell-script automation version:
https://github.com/sailfish009/llvm_all
$ sudo apt-get install libffi-dev libedit-dev swig git
$ git clone https://github.com/sailfish009/llvm_all
$ git clone https://github.com/llvm/llvm-project
$ cd llvm_all
$ cp *.sh ../llvm-project/
$ cd ../llvm-project/
$ ./set.sh
$ ./install.sh
$ clang++ --version
clang version 11.0.0 (https://github.com/llvm/llvm-project 032251e34d17c1cbf21e7571514bb775ed5cdf30)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
Just build it yourself, as explained here. I added -D CMAKE_CXX_COMPILER=clang++ -D CMAKE_C_COMPILER=clang to use clang as the compiler:
$ git clone https://github.com/llvm/llvm-project.git
$ cd llvm-project
$ mkdir build
$ cmake -G Ninja -S runtimes -B build -DLLVM_ENABLE_RUNTIMES="libcxx;libcxxabi;libunwind" -D CMAKE_CXX_COMPILER=clang++ -D CMAKE_C_COMPILER=clang # Configure for clang++
$ ninja -C build cxx cxxabi unwind # Build
$ ninja -C build check-cxx check-cxxabi check-unwind # Test
$ ninja -C build install-cxx install-cxxabi install-unwind # Install
I wrote a program (using coroutines), and tried to compile it with clang 9 on Ubuntu 18.04.4 LTS, but I get this error:
$ clang++-9 -stdlib=libc++ -std=c++2a coroutins_iterator.cpp
/usr/bin/ld: cannot find -lc++abi
clang: error: linker command failed with exit code 1 (use -v to see invocation)
How can I compile my program? What is going wrong?
I installed libc++ with
sudo apt-get install libc++-dev
You installed the wrong version of libc++, it seems. From what I can tell libc++-dev refers to version 6, not 9, in the Ubuntu 18.08 repositories. For Clang 9 you would want to install the corresponding version of libc++:
sudo apt-get install libc++-9-dev
This should also install the matching version of libc++abi.
I installed g++ using those commands line:
sudo add-apt-repository ppa:jonathonf/gcc-7.1
sudo apt-get update
Then
sudo apt-get install gcc-7 g++-7
When it was done I tried g++ -v but still shows me the old version
gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.4)
Am I not upgrading it correctly?
Edit
:~$ dpkg -L g++-7
/.
/usr
/usr/lib
/usr/lib/gcc
/usr/lib/gcc/x86_64-linux-gnu
/usr/lib/gcc/x86_64-linux-gnu/7
/usr/lib/gcc/x86_64-linux-gnu/7/cc1plus
/usr/share
/usr/share/doc
/usr/share/doc/gcc-7-base
/usr/share/doc/gcc-7-base/C++
/usr/share/doc/gcc-7-base/C++/README.C++
/usr/share/doc/gcc-7-base/C++/changelog.gz
/usr/share/man
/usr/share/man/man1
/usr/share/man/man1/x86_64-linux-gnu-g++-7.1.gz
/usr/bin
/usr/bin/x86_64-linux-gnu-g++-7
/usr/share/doc/g++-7
/usr/share/man/man1/g++-7.1.gz
/usr/bin/g++-7
:~$ which g++
/usr/bin/g++
Installing a newer (or older) version of GCC than the Ubuntu default version via the package manager
does not delete the default version. You get both. You can install as many
versions as you like. gcc/g++ will continue
to run the default version. If you have installed GCC 7, then you run
the new compilers with gcc-7 or g++-7. For most build systems, it is sufficient to set the environment variables CC=gcc-7 CXX=g++-7 before starting the build.
I installed the gcc-7 using the directions given in Ubuntu Forum, rebooted the system (to make sure all environment variables are loaded) and to compile with C++ 17, type the following on the shell :
g++-7 -std=c++17 program_name.cpp -o program.out
Hope this helps.
So when I first type g++ to check at the console, this is what happens:
arunirc#fisher:~$ g++
The program 'g++' is currently not installed. You can install it by typing:
sudo apt-get install g++
As suggested, I install g++ (did sudo apt-get update and -f before that).
arunirc#fisher:~$ sudo apt-get install g++
Reading package lists... Done
Building dependency tree
Reading state information... Done
g++ is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 121 not upgraded.
But even after it shows that g++ is installed, this is what I get at the command line again:
arunirc#fisher:~$ g++
The program 'g++' is currently not installed. You can install it by typing:
sudo apt-get install g++
Please help! (I am on Ubuntu 14.04).
EDIT 1
(in response to comments)
sudo update-alternatives --config g++ gives this output:
update-alternatives: error: no alternatives for g++
Try using
locate /usr/bin/g++
{when this is out of date, use
sudo updatedb
}
My Ubuntu system currently shows
:~$ locate /usr/bin/g++
/usr/bin/g++
/usr/bin/g++-4.9
/usr/bin/g++-5
Next use
ls -lsa /usr/bin/g++
Mine shows
0 lrwxrwxrwx 1 root root 5 Aug 1 14:32 /usr/bin/g++ -> g++-5
So, my g++ is simply a link to the latest installed g++.
Perhaps this link is either missing or installed incorrectly.
Try manually setting the link.
But before doing that, invoke it directly.
i.e.
/usr/bin/g++-5 --version
my system reports
g++-5 (Ubuntu 5.2.1-22ubuntu2) 5.2.1 20151010
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.
Look through Synaptic and see if you have anything related to g++ and purge it.
I'm trying to install g++ 4.9 or greater in order to build mapbox on Android. The instructions state I need g++ 4.9 or greater. I found the following instructions, but they don't work.
sudo add-apt-repository ppa:ubuntu-toolchain-r/test
sudo apt-get update
sudo apt-get install g++-4.9
The last command says:
~ $ sudo apt-get install g++-4.9
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package g++-4.9 is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package 'g++-4.9' has no installation candidate
I also tried from Synaptic Package Manager and got the following:
g++:
Depends: cpp (>=4:4.9-1ubuntu7) but 4:4.8.2-1ubuntu6 is to be installed
Depends: gcc (>=4:4.9-1ubuntu7) but 4:4.8.2-1ubuntu6 is to be installed
Depends: g++-4.9 (>=4.9) but it is not installable
Depends: gcc-4.9 (>=4.9) but it is not installable
How can I get g++ 4.9 on my computer?
Thanks.
Here is how to install g++-4.9 on Linux Mint 17.2 Rafaela
Go to menu -> Administration -> Software sources
Click on Additional repositories and then Getdeb
Click on Edit URL...
Replace deb http://archive.getdeb.net/ubuntu trusty-getdeb apps
by
deb http://archive.getdeb.net/ubuntu wily-getdeb apps
and click on Update the cache
At this point you can go with
sudo add-apt-repository ppa:ubuntu-toolchain-r/test
sudo apt-get update
sudo apt-get install g++-4.9
You can invoke your g++ like this:
g++-4.9
Now you have g++ 4.9.3 installed
And as an add, you can have the latest g++-5 (g++ 5.2.1) compiler
sudo apt-get install g++-5