In CMake, you just grab the example toolchain file, and enter the paths to 1. Then simply configure your project using this toolchain file, and it just works: CMake will locate the right versions of all packages and invoke the right compilers for your target.įinally, the only step that actually differs between native and cross-compilation is that you need to tell your build system that you want to cross-compile. The difference between cross-development and native development is that you use the "sbuild-apt" command instead of "apt".įinally, the only step that actually differs between native and cross-compilation is that you need to tell your build system that you want to cross-compile. If you need any third-party libraries, you can just install them into the sysroot using APT. The sysroot can be generated in a single command using a tool like "debootstrap" or "mk-sbuild" (see the link I posted earlier). The toolchain can be installed through your favorite package manager, or downloaded from GitHub, for example. a directory that contains the libraries you depend on (including system libraries), usually called the sysroot when cross-compiling (this is just your root directory in the native case).
Cross-compilation is quite similar to native compilation, in either case, you just need two things: 1. I agree that cross-compilation is far too complicated and error-prone. || ] & MEMDEF=1įcp_main don't take it past 4G on 32bit but you can go way past that on 64bit rpi - I use "9G" for my QT build. MEMDEF=$(echo $(fcp_memfree) / $MEMDIV | bc) Granted, my PC can do it in 2.5 seconds (tmpfs) but when you bear in mind "everything" only has to be compiled "once", is it worth it? The pico is worth a cross because there's no operating system and thus no libs to maintain. Linking CXX executable mqtt.elfĠ1:19:19: The process "/usr/local/QT/6400r/bin/cmake" exited normally. Native rpi4 64bit timings.Ġ1:15:51: The process "/usr/local/QT/6400r/bin/cmake" exited normally. Here's a project I'm building for the pico. I have a love/hate relationship with 'cmake' but if that's the tool you'll be using then installing 'ninja' also helps because it prefers those over unix makefiles.
An rpi4 is powerful enough to compile stuff itself so there are those (myself included) who figure it isn't worth the hassle of maintaining a cross-compiler especially if you use a tmpfs on the rpi for the build directory.
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