[Buildroot] Sparc Leon support in Buildroot

Thomas Petazzoni thomas.petazzoni at free-electrons.com
Tue Jul 1 18:22:06 UTC 2014

Hello Konrad,

Back in 2010, you contributed a number of patches to Buildroot to
support the Sparc Leon processors. It turns out that today, those
processors are the only one still needing gcc 4.4.x:

        prompt "GCC compiler Version"
        default BR2_GCC_VERSION_4_4_X if BR2_sparc_sparchfleon || BR2_sparc_sparchfleonv8 || BR2_sparc_sparcsfleon || BR2_sparc_sparcsfleonv8
        default BR2_GCC_VERSION_4_2_2_AVR32_2_1_5 if BR2_avr32
        default BR2_GCC_VERSION_4_7_X if BR2_sparc
        default BR2_GCC_VERSION_4_8_ARC if BR2_arc
        default BR2_GCC_VERSION_4_9_X if BR2_microblaze || BR2_powerpc64le
        default BR2_GCC_VERSION_4_5_X if BR2_bfin
        default BR2_GCC_VERSION_4_8_X

Do you know if there's any reason to still keep gcc 4.4 for those
processors? Wasn't the support for Sparc Leon merged in upstream gcc?
From https://sourceware.org/ml/crossgcc/2011-12/msg00004.html, I see
that some patches were still needed for gcc 4.6, but according to
https://gcc.gnu.org/onlinedocs/gcc/SPARC-Options.html, Sparc Leon
processors seem to be supported.

According to https://gcc.gnu.org/gcc-4.6/changes.html, the Sparc Leon
supported was merged in gcc 4.6: "GCC now supports the LEON series of
SPARC V8 processors. The code generated by the compiler can either be
tuned to it by means of the --with-tune=leon configure option and
-mtune=leon compilation option, or the compiler can be built for the
sparc-leon-{elf,linux} and sparc-leon3-{elf,linux} targets directly.".

Could you update us on the Sparc Leon support, and maybe submit some
patches to Buildroot to make the relevant changes?


Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering

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