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This patch is a new version of a patch already sent several times on the mailing-list, committed and reverted a few times by Daniel Laird, due to several imperfections. This version is a new try at finding a solution that works for everybody. Hopefully it'll work :-) The original problem is that external toolchain builds failed because packages couldn't find their dependent libraries at configure time and could not be linked with them. To fix these two problems, two things are added: * The TARGET_LDFLAGS variable was exposed as LDFLAGS at ./configure time thanks to TARGET_CONFIGURE_OPTS. The TARGET_LDFLAGS variable contains -L options with the path in the STAGING_DIR for the libraries. It allows ./configure scripts to properly compile the small test programs testing whether a dependency is properly installed. * The TARGET_CFLAGS contains a new -Wl,--rpath-link option for both $(STAGING_DIR)/lib and $(STAGING_DIR)/usr/lib. It allows library depending on other libraries to link properly. The TARGET_CFLAGS is exposed as CFLAGS in TARGET_CONFIGURE_OPTS. This new version fixes a problem encountered by hartleys <hartleys@visionengravers.com> when building the kernel. The problem was that the -Wl,--rpath-link options were added to LDFLAGS, while there are options for the C compiler, not the ld linker. Moving them to CFLAGS seems to fix the issue. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> |
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TODO |
To build and use the buildroot stuff, do the following: 1) run 'make menuconfig' 2) select the packages you wish to compile 3) run 'make' 4) wait while it compiles 5) Use your shiny new root filesystem. Depending on which sortof root filesystem you selected, you may want to loop mount it, chroot into it, nfs mount it on your target device, burn it to flash, or whatever is appropriate for your target system. You do not need to be root to build or run buildroot. Have fun! -Erik Offline build: ============== In order to do an offline-build (not connected to the net), fetch all selected source by issuing a $ make source before you disconnect. If your build-host is never connected, then you have to copy buildroot and your toplevel .config to a machine that has an internet-connection and issue "make source" there, then copy the content of your dl/ dir to the build-host. Building out-of-tree: ===================== Buildroot supports building out of tree with a syntax similar to the Linux kernel. To use it, add O=<directory> to the make command line, E.G.: $ make O=/tmp/build And all the output files will be located under /tmp/build. More finegrained configuration: =============================== You can specify a config-file for uClibc: $ make UCLIBC_CONFIG_FILE=/my/uClibc.config And you can specify a config-file for busybox: $ make BUSYBOX_CONFIG_FILE=/my/busybox.config To use a non-standard host-compiler (if you do not have 'gcc'), make sure that the compiler is in your PATH and that the library paths are setup properly, if your compiler is built dynamically: $ make HOSTCC=gcc-4.3.orig HOSTCXX=gcc-4.3-mine Depending on your configuration, there are some targets you can use to use menuconfig of certain packages. This includes: $ make HOSTCC=gcc-4.3 linux26-menuconfig $ make HOSTCC=gcc-4.3 uclibc-menuconfig $ make HOSTCC=gcc-4.3 busybox-menuconfig Please feed suggestions, bug reports, insults, and bribes back to: Erik Andersen <andersen@codepoet.org> or the buildroot mailing list.