Does it safe to link several objects which compiled with different `--std` flags ?

[Remus Clearwater <remus.clearwater@xxxxxxxxx>]

For example:

$ gcc -c --std=gnu90 a.c -o a.o
$ gcc -c --std=gnu11 b.c -o b.o
$ gcc -c --std=c99     c.c -o c.o
$ ld -o bin /lib/crt0.o a.o b.o c.o -lc

I think the answer should be 'true' but I couldn't find any specification
about it yet.

Thanks a lot :)

Remus