[Bug build/19444] build failures with -O1 due to -Wmaybe-uninitialized

["carlos at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=19444

--- Comment #3 from Carlos O'Donell <carlos at redhat dot com> ---
In theory glibc is unbuildable at anything bug -O2. The reason being that
various parts of the dynamic loader *require* inlining to avoid PLT indirection
when the PLT has not yet been initialized.

Having said that, various people have tried to build at -Os and succeeded, but
I'm not sure all of the markings we need are in place to make the build run
successfully.

Why are you trying to build at -O1? Debugging?

I'm using `__attribute__ ((noinline, optimize (0)))` to mark specific functions
I'm interested in debugging, otherwise the entire behaviour of the library
begins to deviate drastically from that which you put into production.

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