601 lines
21 KiB
Markdown
601 lines
21 KiB
Markdown
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# Building Exiv2 dependencies with conan
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Conan is a portable package manager for C/C++ libraries. It can be used to create all dependencies needed to build Exiv2, without needing to install system packages.
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This document provides a step-by-step guide to show you the basic usage of conan. For more details about the tool,
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please visit the [Conan documentation website](http://docs.conan.io/en/latest/).
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Although we provide step-by-step instructions to enable you to build Exiv2 with conan, we recommend that you read conan's documentation to understand the main concepts: [Getting started with Conan](http://docs.conan.io/en/latest/getting_started.html)
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To build Exiv2 with conan, you will also need to install CMake. https://cmake.org/download/
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<name id="TOC"></a>
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----
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### T A B L E _ OF _ C O N T E N T S
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1. [Step by Step Guide](#1)
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1. [Install conan](#1-1)
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2. [Test conan installation](#1-2)
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3. [Create a build directory](#1-3)
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4. [Build dependencies and install conan artefacts in your build directory](#1-4)
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5. [Execute cmake to generate build files for your environment:](#1-5)
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2. [Platform Notes](#2)
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1. [Linux Notes](#2-1)
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2. [Visual Studio Notes](#2-2)
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3. [Cygwin Notes](#2-3)
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4. [MinGW Notes](#2-4)
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3. [Conan Architecture](#3)
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1. [conanfile.py](#3-1)
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2. [Conan Recipes](#3-2)
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3. [Conan server search path](#3-3)
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4. [Configuring conan on your machine](#3-4)
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4. [Building Exiv2 with Adobe XMPsdk 2016](#4)
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1. [Add a remote directory to conan's recipe search path](#4-1)
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2. [Build dependencies and install conan artefacts in your build directory](#4-2)
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3. [Execute cmake to generate build files for your environment](#4-3)
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4. [Build Exiv2 and link Adobe XMPsdk library](#4-4)
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5. [Webready Support](#5)
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<name id="1"></a>
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----
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# 1 Step by Step Guide
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<name id="1-1"></a>
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##### 1.1) </a>Install conan:
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```bash
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$ pip install conan
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```
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For other installation methods (brew, installers, from sources), visit this [link]([install
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conan](http://docs.conan.io/en/latest/installation.html)).
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To upgrade the version of conan:
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```bash
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$ pip install conan --upgrade
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```
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<name id="1-2"></a>
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##### 1.2) Test conan installation
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```bash
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$ conan --version
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Conan version 1.4.1
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```
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<name id="1-3"></a>
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##### 1.3) Create a build directory<name id="1-3"></a>
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Create a build directory and will run the conan commands:
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```bash
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$ mkdir build
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$ cd build
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$ conan profile list
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```
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**IMPORTANT** _**Visual Studio Users**_ require the profile msvc2017Release64 in %HOMEPATH%\.conan\profiles\msvc2017Release64
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```ini
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[build_requires]
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[settings]
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arch=x86_64
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build_type=Release
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compiler=Visual Studio
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compiler.runtime=MD
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compiler.version=15
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os=Windows
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arch_build=x86_64
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os_build=Windows
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[options]
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[env]
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```
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<name id="1-4"></a>
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##### 1.4) Build dependencies and install conan artefacts in your build directory</a>
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Execute `$ conan install` pointing to the directory containing `conanfile.py`.
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```bash
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$ conan install .. --build missing # --profile msvc2017Release64
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```
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_**Visual Studio Users**_ should use `--profile msvc2017Release64`
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The output from this command is quite long as conan downloads or builds zlib, expat, curl and other dependencies.
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<name id="1-5"></a>
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##### 1.5) Execute cmake to generate build files for your environment.
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```bash
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$ cmake .. # -G "Visual Studio 15 2017 Win64" -DCMAKE_BUILD_TYPE=Release
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```
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<name id="1-6"></a>
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##### 1.6) Build Exiv2:
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```bash
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$ cmake --build . --config Release
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```
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[TOC](#TOC)
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<name id="2"></a>
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## 2) Platform Notes
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<name id="2-1"></a>
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### 2.1) Linux Notes
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##### Default Profile
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When you run conan install for the first time, it will detect and write the default profile ~/.conan/profile/default. On my Ubuntu system with GCC 4.9, this is:
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```bash
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[settings]
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os=Linux
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os_build=Linux
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arch=x86_64
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arch_build=x86_64
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compiler=gcc
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compiler.version=4.9
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compiler.libcxx=libstdc++
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build_type=Release
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[options]
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[build_requires]
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[env]
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```
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##### Changing profile settings
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One of the most important **profile** settings to be adjusted in your conan profile when working on Linux is the field
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```bash
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compiler.libcxx=libstdc++11 # Possible values: libstdc++, libstdc++11, libc++
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```
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With the arrival of the c++11 standard, and the growing popularity of the *clang* compiler, it is increasingly important which version of the standard library to use (corresponds to the `-stdlib` compiler flag).
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Recommended **libcxx**
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settings works with conan and different compilers:
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```bash
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compiler.libcxx=libstdc++11 # will use -stdlib=libstdc++ and define _GLIBCXX_USE_CXX11_ABI=1
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compiler.libcxx=libstdc++ # will use -stdlib=libstdc++ and define _GLIBCXX_USE_CXX11_ABI=0
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compiler.libcxx=libc++ # will use -stdlib=libc++
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```
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As a rule of thumb, set `compiler.libcxx=libstdc++11` when using a version of gcc >= 5.1.
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More information about the standard library and GCC [dual ABI in gcc](https://gcc.gnu.org/onlinedocs/libstdc++/manual/using_dual_abi.html) with GCC works.
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Please, be aware that normally when using gcc >= 5.1, \_GLIBCXX\_USE\_CXX11\_ABI is set to 1 by default. However some linux
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distributions might set that definition to 0 by default. In case you get linking errors about standard c++ containers or
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algorithms when bringing the Exiv2 dependencies with conan, this might indicate a mismatch between the value set in
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**compiler.libcxx** and the default values used in your distribution.
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[TOC](#TOC)
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<name id="2-2"></a>
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### 2.2) Visual Studio Notes
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I use the following batch file to start cmd.exe. I do this to reduce the complexity of the path which grows as various tools are installed on Windows. The purpose of this script is to ensure a "stripped down path".
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```
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@echo off
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setlocal
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cd %HOMEPATH%
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set "PATH=C:\Python34\;C:\Python27\;C:\Python27\Scripts;C:\Perl64\site\bin;C:\Perl64\bin;C:\WINDOWS\system32;C:\Program Files\Git\cmd;C:\Program Files\Git\usr\bin;c:\Program Files\cmake\bin;"
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cmd
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```
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### Profiles for Visual Studio
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You can build Exiv2 with either Visual Studio 2015 (version 14) or 2017 (version 15). You create profiles in %HOMEPATH%\.conan\profiles with a text editor.
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If you have an installation of Visual Studio 2017, the profile msvc2017Release64 is as follows:
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```ini
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[build_requires]
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[settings]
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arch=x86_64
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build_type=Release
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compiler=Visual Studio
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compiler.runtime=MD
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compiler.version=15
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os=Windows
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arch_build=x86_64
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os_build=Windows
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[options]
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[env]
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```
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### CMake Generators for Visual Studio
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In the step-by-step guide, the command `$ cmake ..` uses
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the default CMake generator. Always use the generator for your version of Visual Studio. For example:
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```bash
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c:\....\exiv2\build> conan install .. --profile msvc2017Release64 --build missing
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c:\....\exiv2\build> cmake .. -G "Visual Studio 15 2017 Win64" -DCMAKE_BUILD_TYPE=Release -DEXIV2_ENABLE_NLS=0
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c:\....\exiv2\build> cmake --build . --config Release
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```
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CMake provides 4 Generators. The 64 and 32 bit Generators have different names:
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| Architecture | Visual Studio 2015 | Visual Studio 2017|
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|:---------|--------------------|--------------------|
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| 64 bit | "Visual Studio 14 2015 Win64" | "Visual Studio 15 2017 Win64" |
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| 32 bit | "Visual Studio 14 2015" | "Visual Studio 15 2017" |
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### Recommended settings for Visual Studio
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##### 64 bit Release Build
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| | Visual Studio 2015 | Visual Studio 2017|
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|:---------|--------------------|--------------------|
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| _**conan install .. --profile**_ | msvc2015Release64 | msvc2017Release64 |
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| _**cmake -G**_ | "Visual Studio 14 2015 Win64" | "Visual Studio 15 2017 Win64" |
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| _**cmake**_ | -DCMAKE\_BUILD\_TYPE=Release | -DCMAKE\_BUILD\_TYPE=Release |
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| _**profile**_ | arch=x86\_64 | arch=x86\_64 |
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| | arch\_build=x86\_64 | arch\_build=x86\_64 |
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| | build\_type=Release | build\_type=Release |
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| | compiler.runtime=MD | compiler.runtime=MD |
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| | compiler.version=14 | compiler.version=15 |
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| | compiler=Visual Studio | compiler=Visual Studio |
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| | os=Windows | os=Windows |
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| | os\_build=Windows | os\_build=Windows |
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##### Debug Builds
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|| Visual Studio 2015 | Visual Studio 2017|
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|:-------|-------|------|
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| _**conan install .. --profile**_ | msvc2015Debug64 | msvc2017Debug64 |
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| _**cmake**_ | -DCMAKE\_BUILD\_TYPE=Debug | -DCMAKE\_BUILD\_TYPE=Debug |
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| _**profile**_ | build_type=Debug | build_type=Debug |
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| | compiler.runtime=MDd | compiler.runtime=MDd |
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##### 32bit Builds
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|| Visual Studio 2015 | Visual Studio 2017|
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|:-----------|--------------------|--------------------|
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| _**conan install .. --profile**_ | msvc2015Release32 | msvc2017Release32 |
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| _**cmake -G**_ | "Visual Studio 14 2015" | "Visual Studio 15 2017" |
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| _**profile**_ | arch=x86 | arch=x86 |
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| | arch_build=x86 | arch_build=x86 |
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##### Static Builds
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The default (and recommended) builds of Exiv2 and sample applications build and use DLLs. If you wish to build static applications and libraries, you will need to set the correct "C" run-time library to be linked both to your code and dependencies being built/downloaded by conan.
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| Static Release | Static Debug |
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|:---------|:-------------------|
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| compiler.runtime=MT | compiler.runtime=MTd |
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Additionally, you will have to use the cmake option -DBUILD\_SHARED\_LIBS=Off
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```
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$ cmake -DBUILD_SHARED_LIBS=Off -DEXIV2_ENABLE_NLS=0 ..
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```
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### Changing profile settings with the conan command
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It is recommended that you create 8 profiles for msvc{2017|2015}{Release|Debug}{64|32}.
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You can modify profile settings on the command line.
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The following example demonstrates making substantial changes to profile settings by performing a 32 bit build using Visual Studio 2015 with a 2017 profile! This example is not considered good practice, it is an illustration to some conan flexibility which be useful when your build environment is automated.
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```bash
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$ conan install .. --profile msvc2017Release64 -s arch_build=x86 -s arch=x86 -s compiler.version=14
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$ cmake .. -G "Visual Studio 2015"
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$ cmake --build . --config Release
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```
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### CMake/Cygwin Collisions on the build machine
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If you have Cygwin installed on your build machine, you may encounter the situation
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that CMake erroneously finds library files in Cygwin directories and adds `c:\\cygwin64\\usr\\include` to the
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compiler header search path. FindIntl is a prime suspect and I believe this issue is caused by %PATH%.
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I recommend that you disable Natural Language Support when building with Visual Studio:
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```
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$ cmake .. -G "Visual Studio 15 2017 Win64" -DCMAKE_BUILD_TYPE=Release -DEXIV2_ENABLE_NLS=Off
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```
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If necessary, temporarily rename c:\\cygwin64\\usr\\include as c:\\cygwin64\\usr\\uncle to hide those files when working with CMake.
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[TOC](#TOC)
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<name id="2-3"></a>
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### 2.3) Cygwin Notes
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Do not use conan on the Cygwin Platform. To build Exiv2 for Cygwin use CMake without conan. We recommend installing or building dependences (expat, zlib) with platform tools.
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<name id="2-4"></a>
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### 2.4) MinGW Notes
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Team Exiv2 supports MinGW msys/2. Team Exiv2 does not support MinGW msys/1.0.
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As with Cygwin, we recommend installing or building dependencies with platform tools dependencies and using CMake to build Exiv2.
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[TOC](#TOC)
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<name id="3">
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## 3 Conan Architecture
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<name id="3-1">
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##### 3.1) conanfile.py
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In the root level of the **Exiv2** repository, the file `conanfile.py` defines C/C++ dependencies with the syntax: `Library/version@user/channel`
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For example, **zlib**:
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```python
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self.requires('self.requires('zlib/1.2.11@conan/stable')')
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```
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[TOC](#TOC)
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<name id="3-2">
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##### 3.2) Conan _**Recipes**_
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Conan searches remote servers for a _**recipe**_ to build a dependency.
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A _**recipe**_ is a python file which indicates how to build a library from sources. The recipe
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understands configurations: Platform/Compiler/Settings. If the remote server has a pre-compiled package for
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your configuration, it will be downloaded. Otherwise, conan will compile the libraries on your machine using instructions in the recipe.
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To illustrate, here is list of packages that returned by the command `$ conan search`
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```bash
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$ conan search --remote conan-center zlib/1.2.11@conan/stable
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```
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The output should be:
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```bash
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Existing packages for recipe zlib/1.2.11@conan/stable:
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Package_ID: 0000193ac313953e78a4f8e82528100030ca70ee
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[options]
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shared: False
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[settings]
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arch: x86_64
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build_type: Debug
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compiler: gcc
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compiler.version: 4.9
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os: Linux
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Outdated from recipe: False
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Package_ID: 014be746b283391f79d11e4e8af3154344b58223
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[options]
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shared: False
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[settings]
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arch: x86_64
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build_type: Debug
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compiler: gcc
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compiler.exception: seh
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compiler.threads: posix
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compiler.version: 5
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os: Windows
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Outdated from recipe: False
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... deleted ....
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```
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[TOC](#TOC)
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<name id="3-3">
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##### 3.3) Conan server search path
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Conan searches remote servers for a _**recipe**_ to build the dependency. You can list them with the command:
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```bash
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$ conan remote list
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```
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You can add servers to the conan server search path:
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```bash
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$ conan remote add conan-piponazo https://api.bintray.com/conan/piponazo/piponazo
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```
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[TOC](#TOC)
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<name id="3-4">
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##### 3.4) Configuring conan on your machine
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Conan stores its configuration and local builds in the directory ~/.conan (%HOMEPATH%\\.conan on Windows).
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Conan installs several files and two directories:
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```bash
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$HOME/.conan/profiles Configuration files for compilers/platforms
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$HOME/.conan/data Dependencies are built/stored in this directory
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```
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[TOC](#TOC)
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<name id="3-5">
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##### 3.5) Running `conan install` for the first time
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The first time you run `$ conan install`, it will auto-detect your configuration and store a default profile in the file
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$HOME/.conan/profiles/default
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Normally you will want to define new profiles for choosing different compilers (msvc, gcc, clang), different
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build_type (Release, Debug), runtimes (MD, MT, MDd, MTd)
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The expected output should be something like this, in case it's the first time you run conan:
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```bash
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$ conan install .. --build missing
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Expat/2.2.5@pix4d/stable: Retrieving from predefined remote 'conan-center'
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Expat/2.2.5@pix4d/stable: Trying with 'conan-center'...
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Downloading conanmanifest.txt
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[==================================================] 220B/220B
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Downloading conanfile.py
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[==================================================] 1.7KB/1.7KB
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zlib/1.2.11@conan/stable: Retrieving from predefined remote 'conan-center'
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zlib/1.2.11@conan/stable: Trying with 'conan-center'...
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Downloading conanmanifest.txt
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[==================================================] 121B/121B
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Downloading conanfile.py
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[==================================================] 5.7KB/5.7KB
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libcurl/7.56.1@bincrafters/stable: Retrieving from predefined remote 'bincrafters'
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libcurl/7.56.1@bincrafters/stable: Trying with 'bincrafters'...
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Downloading conanmanifest.txt
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...
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PROJECT: Installing D:\Dev\Windows\projects\exiv2\conanfile.py
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Requirements
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Expat/2.2.5@pix4d/stable from 'conan-center'
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OpenSSL/1.0.2n@conan/stable from 'conan-center'
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gtest/1.8.0@bincrafters/stable from 'conan-center'
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libcurl/7.56.1@bincrafters/stable from 'bincrafters'
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zlib/1.2.11@conan/stable from 'conan-center'
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Packages
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Expat/2.2.5@pix4d/stable:6cc50b139b9c3d27b3e9042d5f5372d327b3a9f7
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OpenSSL/1.0.2n@conan/stable:606fdb601e335c2001bdf31d478826b644747077
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gtest/1.8.0@bincrafters/stable:a35f8fa327837a5f1466eaf165e1b6347f6e1e51
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libcurl/7.56.1@bincrafters/stable:e37838f02fd790447943465f1c9317fd1c59b95c
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zlib/1.2.11@conan/stable:6cc50b139b9c3d27b3e9042d5f5372d327b3a9f7
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PROJECT: Retrieving package 6cc50b139b9c3d27b3e9042d5f5372d327b3a9f7
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Expat/2.2.5@pix4d/stable: Looking for package 6cc50b139b9c3d27b3e9042d5f5372d327b3a9f7 in remote 'conan-center'
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Downloading conanmanifest.txt
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[==================================================] 323B/323B
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Downloading conaninfo.txt
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[==================================================] 438B/438B
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Downloading conan_package.tgz
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[==================================================] 133.6KB/133.6KB
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Expat/2.2.5@pix4d/stable: Package installed 6cc50b139b9c3d27b3e9042d5f5372d327b3a9f7
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PROJECT: Retrieving package a35f8fa327837a5f1466eaf165e1b6347f6e1e51
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|
gtest/1.8.0@bincrafters/stable: Looking for package a35f8fa327837a5f1466eaf165e1b6347f6e1e51 in remote 'conan-center'
|
|
Downloading conanmanifest.txt
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|
[==================================================] 3.5KB/3.5KB
|
|
Downloading conaninfo.txt
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|
[==================================================] 478B/478B
|
|
Downloading conan_package.tgz
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|
[==================================================] 1001.1KB/1001.1KB
|
|
gtest/1.8.0@bincrafters/stable: Package installed a35f8fa327837a5f1466eaf165e1b6347f6e1e51
|
|
PROJECT: Retrieving package 6cc50b139b9c3d27b3e9042d5f5372d327b3a9f7
|
|
...
|
|
PROJECT: Generator cmake created conanbuildinfo.cmake
|
|
PROJECT: Generator txt created conanbuildinfo.txt
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|
PROJECT: Generated conaninfo.txt
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|
PROJECT imports(): Copied 5 '.dll' files
|
|
(conan)
|
|
```
|
|
|
|
Note that it first downloads the recipes, and then the binary packages. When everything goes well, conan found
|
|
the recipes in the remotes, and it also found packages for our configuration (msvc2017, Release, MD).
|
|
|
|
However, if you use other configuration for which there are no packages in the remotes, you will get an error such as:
|
|
|
|
```bash
|
|
PROJECT: WARN: Can't find a 'zlib/1.2.11@conan/stable' package for the specified options and settings:
|
|
- Settings: arch=x86_64, build_type=Release, compiler=clang, compiler.version=3.9, os=Macos
|
|
- Options: shared=False
|
|
|
|
ERROR: Missing prebuilt package for 'zlib/1.2.11@conan/stable'
|
|
Try to build it from sources with "--build zlib"
|
|
Or read "http://docs.conan.io/en/latest/faq/troubleshooting.html#error-missing-prebuilt-package"
|
|
```
|
|
|
|
In that case, we can tell conan to build the library:
|
|
|
|
```bash
|
|
$ conan install .. --profile MyEsotericProfile --build missing
|
|
```
|
|
|
|
Once the command succeeds, we will have the libraries in our system (you can find the recipes and packages in
|
|
`$HOME/.conan/data`). When you execute the command `conan install` with the same profile, the following output is typical:
|
|
|
|
```bash
|
|
$ conan install ..
|
|
PROJECT: Installing D:\Dev\Windows\projects\exiv2\conanfile.py
|
|
Requirements
|
|
Expat/2.2.5@pix4d/stable from 'conan-center'
|
|
OpenSSL/1.0.2n@conan/stable from 'conan-center'
|
|
gtest/1.8.0@bincrafters/stable from 'conan-center'
|
|
libcurl/7.56.1@bincrafters/stable from 'bincrafters'
|
|
zlib/1.2.11@conan/stable from 'conan-center'
|
|
Packages
|
|
Expat/2.2.5@pix4d/stable:6cc50b139b9c3d27b3e9042d5f5372d327b3a9f7
|
|
OpenSSL/1.0.2n@conan/stable:606fdb601e335c2001bdf31d478826b644747077
|
|
gtest/1.8.0@bincrafters/stable:a35f8fa327837a5f1466eaf165e1b6347f6e1e51
|
|
libcurl/7.56.1@bincrafters/stable:e37838f02fd790447943465f1c9317fd1c59b95c
|
|
zlib/1.2.11@conan/stable:6cc50b139b9c3d27b3e9042d5f5372d327b3a9f7
|
|
|
|
Expat/2.2.5@pix4d/stable: Already installed!
|
|
gtest/1.8.0@bincrafters/stable: Already installed!
|
|
zlib/1.2.11@conan/stable: Already installed!
|
|
OpenSSL/1.0.2n@conan/stable: Already installed!
|
|
libcurl/7.56.1@bincrafters/stable: Already installed!
|
|
PROJECT: Generator cmake created conanbuildinfo.cmake
|
|
PROJECT: Generator txt created conanbuildinfo.txt
|
|
PROJECT: Generated conaninfo.txt
|
|
PROJECT imports(): Copied 5 '.dll' files
|
|
```
|
|
|
|
Indicating that the packages were found in the local cache.
|
|
|
|
[TOC](#TOC)
|
|
<name id="4">
|
|
## 4 Building Exiv2 with Adobe XMPsdk 2016
|
|
|
|
With Exiv2 v0.27, you can build Exiv2 with Adobe XMPsdk 2016 on Linux/GCC, Mac/clang and Visual Studio 2017.
|
|
Other platforms such as Cygwin are not supported by Adobe. Adobe/XMPsdk is built as a external library.
|
|
Applications which wish use the Adobe XMPsdk directly should build Exiv2 in this configuration and the
|
|
library can be used by the application and Exiv2. The Adobe XMPsdk can be built as a static or shared library (.DLL)
|
|
|
|
To build Exiv2 with Adobe XMPsdk 2016, should perform steps 1.1, 1.2 and 1.3 described above, then perform the following:
|
|
|
|
<name id="4-1">
|
|
##### 4.1) Add a remote directory to conan's recipe search path
|
|
|
|
By default, conan knows about several public conan repositories. Exiv2 requires
|
|
the **piponazo** repository to find the XmpSdk dependency which is not available from **conan-center** repository.
|
|
|
|
```bash
|
|
$ conan remote add conan-piponazo https://api.bintray.com/conan/piponazo/piponazo
|
|
```
|
|
|
|
<name id="4-2">
|
|
##### 4.2) Build dependencies and install conan artefacts in your build directory
|
|
|
|
```bash
|
|
$ conan install .. --options xmp=True --build missing
|
|
```
|
|
|
|
<name id="4-3">
|
|
##### 4.3) Execute cmake to generate build files for your environment:
|
|
|
|
You must tell CMake to link Adobe's library:
|
|
|
|
```bash
|
|
$ cmake .. -DEXIV2_ENABLE_EXTERNAL_XMP=On # -G "Visual Studio 15 2017 Win64" -DCMAKE_BUILD_TYPE=Release
|
|
```
|
|
**MacOS-X** users should use the cmake _**Xcode**_ Generator
|
|
|
|
```bash
|
|
$ cmake .. -DEXIV2_ENABLE_EXTERNAL_XMP=On -G Xcode
|
|
```
|
|
|
|
<name id="4-4">
|
|
##### 4.4) Build Exiv2 and link Adobe XMPsdk library
|
|
|
|
```bash
|
|
$ cmake --build . --config Release
|
|
```
|
|
|
|
[TOC](#TOC)
|
|
<name id="5">
|
|
## 5 Webready Support
|
|
|
|
Exiv2 can perform I/O using internet protocols such as https, https, ftp and ssh.
|
|
|
|
The feature is disabled by default. You will need to instruct conan to build/download necessary libraries (curl, openssl and libssh) and tell CMake to link to the libraries.
|
|
|
|
```
|
|
$ conan install .. --options webready=True
|
|
$ cmake -DEXIV2_ENABLE_WEBREADY=ON -DEXIV2_ENABLE_CURL=ON -DEXIV2_ENABLE_SSH=ON ..
|
|
```
|
|
|
|
[TOC](#TOC)
|