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OpenJDK is a free and open-source implementation of the Java Platform. This package provides the option to build a client or a server JVM interpreter. The default option is the server option, as that is what the majority of users use. This JVM interpreter loads more slowly, putting more effort into JIT compilations to yield higher performance. Unlike most autotools packages, OpenJDK is exceptionally different and has many quirks, some of which are below: - X11, alsa, and cups are required to build Java, even if it's a headless build. See http://hg.openjdk.java.net/jdk10/jdk10/raw-file/tip/common/doc/building.html#external-library-requirements for more information. - host-zip is needed for the zip executable. - There is no autogen.sh file, instead, a user must call "./configure autogen." - OpenJDK ignores some variables unless passed via the environment. These variables are: PATH, LD, CC, CXX, and CPP. - OpenJDK defaults ld to the ld binary but passes -Xlinker and -z as arguments during the linking process, which causes linking failures. To fix this issue, ld is set to gcc. - Make -jn is unsupported. Instead, one must use the "--with-jobs=" configure option, and use $(MAKE1). Signed-off-by: Adam Duskett <Aduskett@gmail.com> [Thomas: - drop explanations about CC, LD, CXX, etc. be set to their "actual binaries" instead of ccache: TARGET_CC/TARGET_LD/TARGET_CXX point to the compiler wrapper, so the usage of ccache is hidden - make sure at least one of the variants is enabled in Config.in - drop the submenu for variant selection - use system zlib instead of the bundled one. This works fine when BUILD_SYSROOT_CFLAGS and BUILD_SYSROOT_LDFLAGS are passed - fix minor nits in the Config.in comments] Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Buildroot is a simple, efficient and easy-to-use tool to generate embedded Linux systems through cross-compilation. The documentation can be found in docs/manual. You can generate a text document with 'make manual-text' and read output/docs/manual/manual.text. Online documentation can be found at http://buildroot.org/docs.html To build and use the buildroot stuff, do the following: 1) run 'make menuconfig' 2) select the target architecture and the packages you wish to compile 3) run 'make' 4) wait while it compiles 5) find the kernel, bootloader, root filesystem, etc. in output/images You do not need to be root to build or run buildroot. Have fun! Buildroot comes with a basic configuration for a number of boards. Run 'make list-defconfigs' to view the list of provided configurations. Please feed suggestions, bug reports, insults, and bribes back to the buildroot mailing list: buildroot@buildroot.org You can also find us on #buildroot on Freenode IRC. If you would like to contribute patches, please read https://buildroot.org/manual.html#submitting-patches