[Buildroot] Trying to compile uClibc in thumb mode

[Thomas Petazzoni]

Hi,

I'm currently trying to compile uClibc in thumb mode using Buildroot
(binutils 2.18.50.0.1, gcc 4.2.1, uclibc 0.9.29). To enable thumb mode,
I simply modified toolchain/uClibc/uClibc-0.9.29.config, and set
UCLIBC_EXTRA_CFLAGS to "-mthumb".

However, the compilation fails quickly in ldso:

make[1]: entrant dans le répertoire « /mnt/space/free-electrons/buildroot/toolchain_build_arm/uClibc-0.9.29 »
  CC ldso/ldso/ldso.oS
ldso/ldso/dl-elf.c: In function '_dl_load_elf_shared_library':
ldso/ldso/dl-elf.c:647: error: unable to find a register to spill in class 'LO_REGS'
ldso/ldso/dl-elf.c:647: error: this is the insn:
(insn:HI 912 911 913 105 (set (reg/v:SI 0 r0 [ _a1 ])
        (plus:SI (reg/v:SI 187 [ map_size ])
            (reg:SI 214 [ iftmp.138 ]))) 5 {*thumb_addsi3} (nil)
    (expr_list:REG_DEAD (reg/v:SI 187 [ map_size ])
        (expr_list:REG_DEAD (reg:SI 214 [ iftmp.138 ])
            (nil))))
ldso/ldso/dl-elf.c:647: confused by earlier errors, bailing out
make[1]: *** [ldso/ldso/ldso.oS] Erreur 1

Is it an issue with uClibc itself or with the compiler ?

Thanks for your help,

Thomas
-- 
Thomas Petazzoni, Free Electrons
Free Embedded Linux Training Materials
on http://free-electrons.com/training
(More than 1500 pages!)
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