[Buildroot] [Bug 8766] Compiling host-gcc-final-4.9.3 broken on i386

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=8766

--- Comment #3 from Thomas Petazzoni <thomas.petazzoni at free-electrons.com> ---
After some research, it seems to be an x86 specific issue. The file causing
problems is libgcc/generic-morestack-thread.c, which gets included in the build
by libgcc/config/t-stack. It is related to the implementation of -fsplit-stack,
which is only supported on x86 32/64.

So on other architectures, a no thread configuration should still build fine.
However, seeing that on a major arch like x86 the nothread support has been
broken for a while (-fsplit-stack has been around since gcc 4.6) really makes
me wonder if we should continue to support the no thread solution.

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