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Asterisk: the flagship of telephony on Linux. These are the lines of code whose continuous mission is to power small and large enterprises telephony systems, to boldly provide IP PBX where no one has done so before. But it is a hell to get compiled... :-( For starters, it needs a host tool, menuselect, to prepare its build configuration. Unfortunately, the way it handles menuselect does not apply very well for cross-compilation: the main ./configure calls out to menuselect's own ./configure, and of course that runs with the same environement, which is wrong for cross-compilation (because of variables like CC, CFLAGS and the likes). Furthermore, the paths to menuselect are imbricated about everywhere in the main Makefile, so making it find menuselect in PATH is a lost cause. Instead, we just patch-out the handling of menuselect, build it as the host variant and copy it in place. Now, asterisk wants to install a default set of sound files (for answering machine stuff, I guess). They come come pre-bundled in the official archive [0], but the buildsystem will want to download (at install time) the sha1 files for each sound archive, to validate that said archive is correct. However, the download is done via plain http, so it still risks an MITM attack. And for Buildroot, it is not always possible to download at install time, so we patch-out the sha1 check. [0] http://downloads.asterisk.org/pub/telephony/asterisk/releases/ The official archive contains the sound archives plus a full set of documentation. This makes it very big. Unfortunately, the hosting site is rather slow, topping at about ~204kbps. So we get the archive from the official mirror on Github. But that archive is missing the sound archives, so we download them separately. Some tests, like the crypt() one, are broken and could not have ever possibly worked at all. Worse, the FFmpeg test is looking for headers that FFmpeg removed more than 10 years ago and are virtually no longer available in any distro. So, FFmpeg support is definitely not tested by upstream and can't possibly work at all. Finally, trying to run test-code does not work in cross-compilation. As a final stroke of genius, asterisk checks for the re-entrant variant of res_ninit(), and concludes that all such functions are available, including res_nsearch(). Uclibc-ng has the former but not the latter, so the build fails. Since there is no cache variable for that check, we can't pre-feed that result to configure, and fixing it is a bigger endeavour. So we make asterisk depend on glibc for now, until someone is brave enough to fix it. Almost all features are disabled for now. Support for additional features will be added in subsequent patches now that we have a working base. Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr> Cc: Romain Naour <romain.naour@openwide.fr> Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> [Arnout: - make libilbc a mandatory dependency instead of using the bundled one; - add license, license files, and license file hashes; - minor spelling corrections; - remove redundant trailing backslash reported by check-package; - rewrap help text to 72 columns instead of 68] Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be> fixup |
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| 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 Freenode IRC. If you would like to contribute patches, please read https://buildroot.org/manual.html#submitting-patches