Trick to see hwcaps from /proc/self/auxv as seen by ld.so/glibc:
% LD_SHOW_AUXV="" cat </dev/null
AT_HWCAP:    swp half thumb fast-mult vfp edsp
AT_PAGESZ:       4096
AT_CLKTCK:       100
AT_PHDR:         0x8034
AT_PHENT:        32
AT_PHNUM:        9
AT_BASE:         0x40000000
AT_FLAGS:        0x0
AT_ENTRY:        0x8ba8
AT_UID:          1000
AT_EUID:         1000
AT_GID:          1000
AT_EGID:         1000
AT_SECURE:       0
AT_EXECFN:       /bin/cat
AT_PLATFORM:     v7l

Trick to force hwcaps on a platform:
% sudo LD_HWCAP_MASK=0x0 ldconfig
now ld.so wont find any additional hwcap selected libs in the ldconfig cache:
% ldconfig -p | grep vfp
% ldd /bin/ls | grep vfp

-- 
NEON and THUMBEE hwcaps
https://bugs.launchpad.net/bugs/343602
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