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Dont want to discuss recent glibc segfaults, but some other stuff related.

1. echo "CFLAGS += -march=i486 -mtune=native -O3 -pipe" > configparms (in glibc receipt)
Looks strange to me:
-mtune=native - optimization for pentium4 processor (bb uses it, afaik). Unneeded and may harm performance and stability.
-O3 - same here. O3 - enables ftree-vectorize (processor-related stuff) and produces larger binaries (more chance not to fit in L2/3 cache and cause a performance degradation)

2. switch to eglibc? Debian and ubuntu use it as main libc implemenntation.
It's fully compatible with glibc (drop-in), more stable and allows to do more configuration (build with -Os cflag for ex.)
More features here:

With best regards, Alexander.

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