[Bug target/81084] [8 Regression] powerpcspe port full of confusing configury / command-line options not related to SPE

[rguenther at suse dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81084

--- Comment #43 from rguenther at suse dot de <rguenther at suse dot de> ---
On Thu, 19 Apr 2018, glaubitz at physik dot fu-berlin.de wrote:

> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81084
> 
> --- Comment #40 from John Paul Adrian Glaubitz <glaubitz at physik dot fu-berlin.de> ---
> Is there documentation like this for gcc?
> 
> > https://llvm.org/docs/WritingAnLLVMBackend.html
> 
> Would be very useful for people wanting to help with the old backends.

The wiki has some material, a quick search finds
https://gcc.gnu.org/wiki/WritingANewBackEnd not sure how useful or
up-to-date it is.