[Bug c/20631] Support -std=c90 as alias for -std=c89

[kst at mib dot org]

------- Additional Comments From kst at mib dot org  2005-03-24 22:50 -------
> the correct way is:
> -std=iso9899:1990

Sure, but as long as "-std=c89" is supported, why not support "-std=c90"
as well?  It's more correct than "c89", and it's easier to remember
than "iso9899:1990".


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20631