Does -march affect binary compatibility?

[Joseph Garvin <joseph.h.garvin@xxxxxxxxx>]

In the docs here:

http://gcc.gnu.org/onlinedocs/gcc/i386-and-x86_002d64-Options.html

It says that 'mtune' doesn't affect ABI, but it doesn't specify if
'march' does or not. Will -march=i386 compiled libraries link against
-march=i686 compiled apps? Also if any devs read this maybe you could
update the docs to clarify this for future users? ;)

Thanks,

Joe