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WebEngine is a big project to build. It uses ninja which is a build system that does everything in parallel[1]. Builds are always run in parallel, based by default on the number of CPUs your system has. Underspecified build dependencies will result in incorrect builds. QtWebEngine does not propagate the parallel flag from the running instance of make to ninja. Thus, all the machine cores are used to build this single project. make -j 10 -> ninja -j # all cores This behavior disrupts powerful machines which are setup to build many projects in parallel. Even worse, the build fails on machines where the ratio CPU-cores / amount of RAM (including swap) is not appropriate. g++ may have not enough of memory to build all those files in parallel. Unfortunatly, the target `run_ninja' is hardcoded in the Makefile src/core/Makefile.run_gn; there is no way to propagate flags using a variable through the make command-line. run_ninja: /home/gportay/src/buildroot/output-qt5.11/build/qt5webengine-5.11.1/src/3rdparty/ninja/ninja -C /home/gportay/src/buildroot/output-qt5.11/build/qt5webengine-5.11.1/src/core/release QtWebEngineCore Luckily, the Qt gn_run.pro[2] can hardcode ninja extra flags through the variable NINJAFLAGS when the Makefile is generated (which is performed during the build and not during configure step). This commit sets the NINJAFLAGS using the variable PARALLEL_JOBS to limit the number of cores used by ninja. Fixes: virtual memory exhausted: Cannot allocate memory [1]: https://ninja-build.org/manual.html#_comparison_to_make [2]: https://github.com/qt/qtwebengine/blob/v5.11.1/src/core/gn_run.pro#L49-L53 CC: Damien Riegel <damien.riegel@savoirfairelinux.com> CC: Jean-François Têtu <jean-francois.tetu@savoirfairelinux.com> Signed-off-by: Gaël PORTAY <gael.portay@savoirfairelinux.com> Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr> 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