[LLVMdev] advice on default options for building LLVM-GCC on Ubuntu Linux

[Duncan Sands]

Hi Bill,

> We use GNUmakefile to trigger using the build_gcc script.

thanks for the explanation, but I still don't understand why
it is done this way.  Why not just get Apple people to run some
script, rather than trying to have "make" automagically do an
Apple build?

> It's not  
> ideal, but it's all we have at the moment. For LLVM, we placed those  
> files in a subdirectory. This isn't ideal because of our build  
> processes, but was better than the alternative. We would *really*  
> prefer not doing the same thing to LLVM-GCC. Because we've been  
> building LLVM-GCC with srcdir != objdir for years now, it shouldn't be  
> too much of a burden. . .
> 
>  From what I understand, FSF GCC doesn't recommend building with  
> srcdir == objdir. Not that this necessarily means much to us, but  
> should indicate that it's not entirely out of the ordinary that we  
> require srcdir != objdir for LLVM-GCC. :-)

Newcomers to llvm-gcc regularly try to build with srcdir == objdir.
Some of them come on irc and ask about why it fails, but probably
most of them just give up on llvm-gcc.

Ciao,

Duncan.