We also demonstrated automatic management of the ZLib dependency for the major OSs, Windows, Linux and OSX. These tools are installed locally, and apply only to the OpenSSL build, which keeps the development machine unpolluted. In this blog post we described how to achieve a reproducible build that includes the conditional (Windows only) automatic installation of required dev tools such as Nasm and Perl. Once you have the OpenSSL package, you can safely remove them, install again and you will notice they are not retrieved again. This command will fire the installation in Windows of StrawberryPerl and Nasm too, of course. ZLib will be built from sources too, as there is no pre-built binary for VS 9 for ZLib either. $ conan install -s compiler = "Visual Studio" -s compiler.version =9 -s arch =x86 -build =missing If you try to install Conan for an older version of Visual Studio (version 9) in Windows, you’ll get the following error: The above matrix shows the current binaries stored in Bintray, but that doesn’t mean that other configurations will not work. Take a look at the Conan OpenSSL package recipe repository to see how this is done. The above matrix is a sneak preview for a new feature that will be available in the next Conan release v0.25 :)Ĭreating the binaries, testing them and automatically uploading them to Bintray, is a fully automated process using the Travis and Appveyor public and free Continuous Integration services. Here’s the current matrix for the OpenSSL package in Conan-Center: Together with the automation of the ZLib conditional requirement as well as the build-requirements to StrawberryPerl and Nasm, it allows the creation of more than 80 different binaries for multiple compilers and versions in Windows, Linux and OSX. With over 240 lines of code, the OpenSSL Conan recipe is one of the most complex and longest recipes, due to this variability. arch = "x86_64" : command = "./Configure darwin64-x86_64-cc %s" % config_options_string else : command = "./config %s %s" % ( config_options_string, m32_suff ) run_in_src ( "make" ) def osx_build ( self, config_options_string ): m32_suff = " -m32" if self. config -fPIC %s %s" % ( m32_pref, config_options_string, m32_suff ) self. "-fno-inline-functions" config_options_string m32_pref = "setarch i386" if self. build_type = "Debug" : config_options_string = "-d no-asm -g3 -O0 -fno-omit-frame-pointer " \ def linux_build ( self, config_options_string ): m32_suff = " -m32" if self. osx_build ( config_options_string ) elif. linux_build ( config_options_string ) elif self. Here’s the relevant section for the OpenSSL Conan package recipe: You can find the Conan packages for both Nasm and StrawberryPerl in Bintray’s Conan-Center.Ĭonan has built-in mechanisms to define both scenarios. So, we’ll call Perl and Nasm build-requirements. If we already have a pre-built binary package for OpenSSL, then Perl and Nasm are no longer necessary and the developer doesn’t even need to install them. While ZLib must be installed at development time, when the developer is linking their code to OpenSSL, Perl and Nasm are only necessary when building OpenSSL from sources. Visual Studio) is a prerequisite and it is already installed on the developer’s machine, having both Perl and Nasm as default prerequisites for a C or C developer is too much. While we can assume that the compiler (e.g. In Nix systems, OpenSSL uses configure and make. In Windows, OpenSSL uses Perl and Nasm (Native Assembler) for its builds. It is possible to build different binaries of OpenSSL with or without using ZLib compression. OpenSSL has an optional dependency on ZLib, which can be configured at build time as an optional requirement. One of the biggest challenges to achieve easy builds for a library is defining a simple way to install its required dependencies. This post describes how to achieve a fully automated build for OpenSSL packages in multiple platforms. Thus, creating binary packages from sources, in a portable manner, for someone who’s not savvy with their build system, is challenging, just because building it is challenging. OpenSSL builds very differently in different operating systems, using different tools and commands. Packaging C/C is not very difficult, as long as you have a well known, documented, relatively portable build setup for your library.
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