How is the firmware binary built in gcc?

Question

ARM

I am reading an article:
https://habrahabr.ru/post/194816/
There, at the beginning of the story, the firmware is assembled by the ld linker.
However, in the subsequent part of the article (libgcc) I came across the text:

The correct solution is to replace the linker call directly with a gcc call, which will already figure out what needs to be linked where.

That is, it is possible to build a binary without using ld? Please explain what is meant here. What gcc command did he use? Should I change the linker file?
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Regarding the error
And then how to tell the linker where to get the object file with the division code from the library?

undefined reference to `__aeabi_uidiv'