4cd669ff93
Currently, building czmq statically fails for some architectures with undefined references to the math library: /usr/powerpc-buildroot-linux-uclibc/sysroot/usr/lib/libstdc++.a(compatibility-ldbl.o): In function `std::tr1::hash<long double>::operator()(long double) const': compatibility-ldbl.cc:(.text._ZNKSt3tr14hashIeEclEe+0x3c): undefined reference to `frexpl' It turns out that this is actually a problem with libstdc++. Depending on the arch, some functions will be in compatibility-ldbl.o. If you use any of these functions, that file will be linked in. And when that file is linked in, all the _other_ functions, which you actually don't use, are also linked in. And one of these functions is the template function hash<long double>::operator(), which uses frexpl. Requiring czmq to link with -lm is a bit weird, given that neither itself, nor any of its dependencies really need it... So ideally it should be fixed in libstdc++ itself. However, as upstream accepted a patch to link with -lm, we use this patch to fix static linking. Fixes: http://autobuild.buildroot.net/results/206/2061238affb685db998100a56c6571538d089a5b/ http://autobuild.buildroot.net/results/caf/caf002d213c9dd09df07858c5c199411ca8ddfa3/ http://autobuild.buildroot.net/results/568/568ac92d2f6d0604b9bf354ea9dca0a7cb5341f6/ http://autobuild.buildroot.net/results/945/9452982fc14f579c61b45a1a189db5f89aab3b80/ Cc: Arnout Vandecappelle <arnout@mind.be> Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Signed-off-by: Jörg Krause <joerg.krause@embedded.rocks> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> |
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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