-std=c89 is not the same as -ansi

[Joseph S. Myers]

This bug report applies to both gcc 2.95.2 and snapshot 2000-04-10, both
on i686-pc-linux-gnu.

-std=c89 is supposed to act the same as -ansi, but does not: the -std
version incorrectly defines macros such as "i386" in the application
namespace.  This is incorrect for all the ISO C standard versions; unless
the C dialect selected is one of the GNU ones or traditional C, these
macros should not be defined.

$ gcc -std=c89 -E -
i386
^D
# 1 ""
1
$ gcc -ansi -E -
i386
^D
# 1 ""
i386
$

-- 
Joseph S. Myers
jsm28@cam.ac.uk