Compiling Nana with Clang 8.0

Introduction
Installing Clang and libc++
Building Nana
Using Nana

Introduction

This article describes how to compile Nana with clang and libc++. The clang version is 8, which currently is a development branch.

Installing Clang and libc++

The llvm.org provides prebuilt clang for Debian and Ubuntu. My Linux distro is LinuxMint, so I chose the Trusty packages. Refer to http://apt.llvm.org for other packages.

Add the repo to the apt sources.list:

sudo vi /etc/apt/sources.list

Add the following line:

deb http://apt.llvm.org/trusty/ llvm-toolchain-trusty main

My Linux distro is LinuxMint(Ubuntu), so don't forget to add following line:

deb http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu trusty main

This is a development branch for clang 8.0. Save the modification.

Update the lists:

wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key|sudo apt-key add -

#Add this PPA to your system if it is Ubuntu
sudo add-apt-repository ppa:ubuntu-toolchain-r/test

sudo apt-get update

Then install clang 8 and libc++:

sudo apt-get install clang-8 lldb-8 lld-8
sudo apt-get install libc++-8-dev libc++abi-8-dev

Finally, please wait for minutes...After that, you can verify clang in terminal with following command.

clang++-8

Building Nana

Download the Nana from the latest development branch(develop-1.7). This is important, because it includes some fixes for clang 8.

Extract the zip file, open the makefile:

vi <nana-path>/build/makefile/makefile

Modify the following lines for clang 8.0

#GCC= g++
GCC = clang++-8

#Modify CXXFLAGS
CXXFLAGS= -g -fexceptions -std=c++17 -stdlib=libc++ -Wall -Wextra -Wunused-variable -Wfatal-errors

Save the modifications, then make, libnana.a will be generated.

Using Nana

Create a use-nana.cpp file

vi use-nana.cpp

Then edit the file

#include <nana/gui.hpp>

int main()
{
	using namespace nana;

	form fm;
	drawing{fm}.draw([](paint::graphics& graph){
		graph.string({10, 10}, "Hello, Nana C++ Library", colors::white);
	});

	fm.show();
	exec();
}

Compile the program:

clang++-8 use-nana.cpp -o use-nana -std=c++17 -stdlib=libc++ -I<nana-path>/include -L<nana-path>/build/bin -lnana -lX11 -lXcursor -lpthread -lrt -lXft -lfontconfig -lc++ -lc++fs

Run the program.