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When Valgrind detects a 32-bit MIPS architecture, it forcibly adds -march=mips32 to CFLAGS; when it detects a 64-bit MIPS architecture, it forcibly adds -march=mips64. This causes Valgrind to be built always for the first ISA revision level (R1), even when the user has configured Buildroot for the second ISA revision level (R2). Since R2 is backwards compatible with R1, you can run a Valgrind built for R1 in an R2 core. This is why nobody noticed about this problem, or at least nobody complained. But, since (I hope) we will support R6 in Buildroot in the near future, this problem will become very important because R6 is not backwards compatible with R1 or R2, so building Valgrind for R1 when your target is R6 will result in a non-working Valgrind. Override the CFLAGS variable (which Valgrind appends to its CFLAGS) and pass the right -march option, so they take precedence over Valgrind's wrongfully detected value. Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com> Reviewed-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be> Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr> Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
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.