[Bug build/26260] undefined reference to `_Unwind_Resume'

["joseph at codesourcery dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=26260

--- Comment #1 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
Linking libc with libgcc_eh is not correct.  See the four-paragraph 
comment on the definitions of libunwind, gnulib and related variables for 
an explanation.  There are various requirements on libgcc and the GCC 
build process to avoid such circular dependencies and to ensure that a 
stripped glibc binary built with an inhibit_libc GCC is identical to one 
built following a longer sequence of alternating GCC and glibc builds.  
It seems you've found another such requirement: libgcc must not be built 
in a way that introduces references to EH symbols in the code statically 
linked into shared libc.

glibc does not itself support being built with -O0 either.  It would be 
desirable to do so, but there might still be requirements in that case for 
some individual files or functions to be compiled with optimization.  
Likewise, even if a libgcc mostly built with -O0 works for building glibc, 
it seems optimization might be required for building some files therein.

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