https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70749
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
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Summary|[4.9/5 Regression] error: |error: storage size of ‘a’
|storage size of ‘a’ isn’t |isn’t known goes away with
|known goes away with -Os |-Os
Known to fail| |4.3.5
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
What version works for you? Even 4.3 doesn't error at -O. I suspect older
compiler eliminate a before diagnosing it.
