Meetup C++ Floripa - Conan.io
2 likes632 views
This document summarizes a presentation about the Conan package manager for C and C++ applications. It discusses popular C++ libraries that are commonly needed like Boost and Poco. It shows how Conan can be used to add these libraries as dependencies to a project without needing to build them manually. The document provides an example of using Conan to add Boost and Poco to a demo application that calculates an MD5 hash and validates an email address. It also gives an overview of how Conan works, including its package naming scheme, local caching of packages, and community around sharing packages on Bintray.
![15
// example.cpp
#include "Poco/MD5Engine.h"
#include <boost/regex.hpp>
#include <string>
#include <iostream>
int main(){
Poco::MD5Engine md5;
md5.update("Hello World");
std::string md5string = Poco::DigestEngine::digestToHex(md5.digest());
std::cout<< "MD5= " << md5string << "n";
std::string s = "correct@email.com", s2="bademail";
boost::regex expr{"b[a-zA-Z0-9._%-]+@[a-zA-Z0-9.-]+.[a-zA-Z]{2,4}b"};
std::cout << std::boolalpha << boost::regex_match(s, expr) << 'n';
std::cout << std::boolalpha << boost::regex_match(s2, expr) << 'n';
}](https://image.slidesharecdn.com/meetupc-conan-171202024431/85/Meetup-C-Floripa-Conan-io-15-320.jpg)
![16
# conanfile.txt
[requires]
Poco/1.8.0.1@pocoproject/stable
Boost/1.64.0@conan/stable
[generators]
cmake](https://image.slidesharecdn.com/meetupc-conan-171202024431/85/Meetup-C-Floripa-Conan-io-16-320.jpg)
![LOCAL CACHE
31
Boost/1.64.0@bincrafters/stable
Package_ID: b2a2dd150fed04abc97d11c09f340db88855c686
[options]
shared: True
[settings]
arch: x86_64
build_type: Release
compiler: gcc
compiler.libcxx: libstdc++
compiler.version: 6.3
os: Linux
[requires]
Boost.Core/1.64.0@bincrafters/stable:5ab84d6acfe1f23](https://image.slidesharecdn.com/meetupc-conan-171202024431/85/Meetup-C-Floripa-Conan-io-31-320.jpg)
![from conans import ConanFile, CMake
class HelloConan(ConanFile):
name = "Hello"
version = "0.1"
settings = "os", "compiler", "build_type", "arch"
options = {"shared": [True, False]}
default_options = "shared=False"
exports_sources = "src/*"
def build(self):
cmake = CMake(self)
cmake.configure()
cmake.build()
def package(self):
self.copy("*.h", dst="include", src="src")
self.copy("*.so", dst="lib", keep_path=False)
self.copy("*.a", dst="lib", keep_path=False)
def package_info(self):
self.cpp_info.libs = ["hello"]](https://image.slidesharecdn.com/meetupc-conan-171202024431/85/Meetup-C-Floripa-Conan-io-35-320.jpg)
Meetup C++ Floripa - Conan.io
- 2. Hello! Uilian Ries C++ Developer Work at Khomp @uilianries 2
- 3. 1. POPULAR C ++ PROJECTS Because you need good libraries
- 4. “ 4 BOOST POCO GTEST ABSEILOPEN CV QT LIBPNGOPENSSLZLIB
- 5. ALL OF THEM NEED TO BE BUILT ▪ Download the source. Build on your machine ▫ It may take several minutes, or even hours ▫ There may be external dependencies ▫ You need to know how to build ▪ Install by system package manager ▫ The version may not be as expected ▫ There may be a patch applied 5
- 6. 2. PACKAGE MANAGERS How to avoid externals in your project
- 9. 9 CPPAN BUCKAROO CGET CPM HUNTER CONAN C++ UNIVERSE
- 10. 3. CONAN The Barbarian arrived to save
- 11. ▪ FOSS ▪ MIT License ▪ Decentralized, GIT style ▪ Handles from source/binaries ▪ Generators for CMake, VS, XCode, qmake … ▪ Developed in Python ▪ +70 contributors ▪ 1K2 stars (Github) 11
- 12. 12 PIP IS ALL YOU NEED TO INSTALL
- 13. 4. CONAN IN ACTION Talk is cheap. Show me the code.
- 14. CONAN IN ACTION ▪ Digest MD5 using Poco project ▪ Check an email address by Boot Regex ▪ Build using CMake 14
- 15. 15 // example.cpp #include "Poco/MD5Engine.h" #include <boost/regex.hpp> #include <string> #include <iostream> int main(){ Poco::MD5Engine md5; md5.update("Hello World"); std::string md5string = Poco::DigestEngine::digestToHex(md5.digest()); std::cout<< "MD5= " << md5string << "n"; std::string s = "correct@email.com", s2="bademail"; boost::regex expr{"b[a-zA-Z0-9._%-]+@[a-zA-Z0-9.-]+.[a-zA-Z]{2,4}b"}; std::cout << std::boolalpha << boost::regex_match(s, expr) << 'n'; std::cout << std::boolalpha << boost::regex_match(s2, expr) << 'n'; }
- 17. 17 # CMakeLists.txt cmake_minimum_required(VERSION 2.8) project(example CXX) include(${CMAKE_BINARY_DIR}/conanbuildinfo.cmake) conan_basic_setup() add_executable(example example.cpp) target_link_libraries(example ${CONAN_LIBS})
- 18. $ mkdir build && cd build $ conan install .. $ cmake .. $ cmake --build . $ bin/example 18 HOW TO BUILD
- 19. 19 RUNNING CONAN
- 20. 20 class ExampleConan(ConanFile): name = "example" version = "0.1.0" settings = "os", "compiler", "build_type", "arch" generators = "cmake" exports_sources = "*" requires = "Poco/1.8.0.1@pocoproject/stable", "Boost/1.64.0@conan/stable" def build(self): cmake = CMake(self) cmake.configure() cmake.build() # Or, using explicit way: self.run('cmake %s/src %s' % (self.source_folder, cmake.command_line)) self.run("cmake --build . %s" % cmake.build_config)
- 21. $ conan create uilian/testing 21 HOW TO BUILD
- 22. 5. CONAN IN A NUTSHELL How the barbarian works.
- 23. UNDERSTANDING THE BARBARIAN ▪ Package naming ▪ System setup ▪ Package distribution ▪ Local cache 23
- 24. PACKAGE NAMING name/version@user/channel ▪ Examples ▫ Poco/1.8.0@lasote/stable ▫ Boost/1.65.1@memsharded/testing ▫ zlib/1.2.11@conan/stable 24
- 25. SYSTEM SETUP ▪ Based on profiles Conan settings + Host configuration = Profile 25
- 26. SYSTEM SETUP 26
- 27. PACKAGE DISTRIBUTION ▪ Git flavor ▪ Support multiple remotes ▪ Central repository - Bintray ▪ Easy to run a local server instance ▪ Artifactory can be used together 27
- 28. PACKAGE DISTRIBUTION 28 conanfile.txt Conan cache conan.corp.org:9300 localhost bintray.com/conan
- 30. LOCAL CACHE ▪ Packages are based on: ▫ Settings ▫ Options ▫ Requires 30
- 31. LOCAL CACHE 31 Boost/1.64.0@bincrafters/stable Package_ID: b2a2dd150fed04abc97d11c09f340db88855c686 [options] shared: True [settings] arch: x86_64 build_type: Release compiler: gcc compiler.libcxx: libstdc++ compiler.version: 6.3 os: Linux [requires] Boost.Core/1.64.0@bincrafters/stable:5ab84d6acfe1f23
- 32. LOCAL CACHE 32 Conan package =1 recipe, N binary packages localhost conanfile.txt amd64 Boost/1.64.0@bincrafters/stable configN i386
- 33. LOCAL CACHE 33
- 34. 6. BONUS How a recipe looks like.
- 35. from conans import ConanFile, CMake class HelloConan(ConanFile): name = "Hello" version = "0.1" settings = "os", "compiler", "build_type", "arch" options = {"shared": [True, False]} default_options = "shared=False" exports_sources = "src/*" def build(self): cmake = CMake(self) cmake.configure() cmake.build() def package(self): self.copy("*.h", dst="include", src="src") self.copy("*.so", dst="lib", keep_path=False) self.copy("*.a", dst="lib", keep_path=False) def package_info(self): self.cpp_info.libs = ["hello"]
- 36. CONAN CREATE
- 37. 7. COMMUNITY Sharing data is the first step toward community.
- 38. BINTRAY AS DOWNLOAD CENTER ▪ JFrog’s solution ▪ Conan Transit: 936 recipes ▪ Conan Center: 21 recipes 38
- 39. 39
- 40. BINCRAFTERS ▪ https://github.com/bincrafters/community ▪ Packaging OSS Software ▪ ~20 members and growing ▪ +200 recipes, including: ▫ Modular Boost, Abseil, Azure, ... ▪ Thanks to @solvingj 40
- 41. REFERENCES ▪ https://github.com/conan-io/conan ▪ https://github.com/bincrafters ▪ https://conan.io ▪ https://docs.conan.io ▪ https://github.com/memsharded/four-c-example ▪ CppCon 2016: Conan, a C and C++ package manager for developers ▪ https://bintray.com/conan ▪ Programming C++ With The 4 Cs: Clang, Cmake, Clion And Conan 41
- 42. THANKS! Questions ? You can find me on: @uilianries - twitter, github cpplang.slack.com - channel #conan or #bincrafters uilianries@gmail.com 42