fb51422780
Some packages have a configure option to enable LTO. Add a global option to enable/disable this in packages. Note that we could instead (or in addition) pass -flto directly to the compiler in the toolchain wrapper, but that has a *much* bigger impact, so for the time being let's not do that. No toolchain dependency is added for this, because all toolchains now support LTO. - LTO support was merged in GCC years before 4.6 (our minimal version) was released. - Our oldest external toolchain, Sourcery ARM 2014.05, has LTO support. - For our internal toolchains, it is supposedly regulated by BR2_GCC_ENABLE_LTO. However, that option only *enables* it - it doesn't disable LTO support when it's not provided. Since LTO support defaults to enabled for a long time already in GCC, in practice all Buildroot-generated toolchains do support LTO. Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com> |
||
|---|---|---|
| arch | ||
| board | ||
| boot | ||
| configs | ||
| docs | ||
| fs | ||
| linux | ||
| package | ||
| support | ||
| system | ||
| toolchain | ||
| utils | ||
| .clang-format | ||
| .defconfig | ||
| .flake8 | ||
| .gitignore | ||
| .gitlab-ci.yml | ||
| .shellcheckrc | ||
| CHANGES | ||
| Config.in | ||
| Config.in.legacy | ||
| COPYING | ||
| DEVELOPERS | ||
| Makefile | ||
| Makefile.legacy | ||
| README | ||
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 OFTC IRC. If you would like to contribute patches, please read https://buildroot.org/manual.html#submitting-patches