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In some situations (old Linux <3.17 or glibc <2.25), expat fail at compilation time with the error: xmlparse.c:150:4: error: #error You do not have support for any sources of high quality entropy enabled. For end user security, that is probably not what you want. Your options include: * Linux >=3.17 + glibc >=2.25 (getrandom): HAVE_GETRANDOM, * Linux >=3.17 + glibc (including <2.25) (syscall SYS_getrandom): HAVE_SYSCALL_GETRANDOM, * BSD / macOS >=10.7 / glibc >=2.36 (arc4random_buf): HAVE_ARC4RANDOM_BUF, * BSD / macOS (including <10.7) / glibc >=2.36 (arc4random): HAVE_ARC4RANDOM, * BSD / macOS >=10.12 / glibc >=2.25 (getentropy): HAVE_GETENTROPY, * Linux (including <3.17) / BSD / macOS (including <10.7) / Solaris >=8 (/dev/urandom): XML_DEV_URANDOM, * Windows >=Vista (rand_s): _WIN32. If you insist on not using any of these, bypass this error by defining XML_POOR_ENTROPY and be vulnerable to hash flooding; you have been warned. If you have reasons to patch this detection code away or need changes to the build system, please open a bug. Thank you! This is caused by the upstream commit [1] "Autotools: Stop using /dev/urandom by default", first included in expat 2.8.2. The Buildroot expat package was bumped to that version in commit [2]. But since all Linux systems have /dev/urandom, we can just enable it by default. Note: this commit does not globally switch the entropy source to /dev/urandom. It is rather enabling it in the list of available sources. On more recent Linux systems (linux >= 3.17, glibc >= 2.25), other sources will be chosen. The entropy source preference order amongst the enabled sources is defined in [3]. This commit also changes the _CONF_OPTS to multiline layout to fit within the 80 characters. [1]d30eca113a[2]6b1f6f7a48[3] https://github.com/libexpat/libexpat/blob/R_2_8_3/expat/lib/xmlparse.c#L1115-L1142 Signed-off-by: Thomas Devoogdt <thomas.devoogdt@barco.com> [Julien: add extra info in the commit log] Signed-off-by: Julien Olivain <ju.o@free.fr> (cherry picked from commitc22fc74f2b) Signed-off-by: Raphaël Mélotte <raphael.melotte@mind.be>
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 https://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