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

[Bill Wendling]

On Apr 5, 2009, at 7:13 AM, Duncan Sands wrote:
> On Saturday 04 April 2009 19:12:55 Mike Stump wrote:
>> On Apr 4, 2009, at 6:17 AM, Duncan Sands wrote:
>>> you need to use a separate objects directory and not build directly
>>> in the llvm-gcc tree.  For some reason the Apple people placed a  
>>> file
>>> GNUmakefile in the tree which "make" chooses in preference to the
>>> Makefile
>>> produced by configuring.  Personally I would like to see GNUmakefile
>>> deleted.
>>
>> My take, you can test an environment variable called RC_RELEASE in  
>> the
>> GNUmakefile and use it, if set, and if it isn't set, include Makefile
>> and use it in preference.  Oh course, this is untested, someone would
>> have to test it in all three environments.
>
> Non-apple people build from svn too, not just releases.  My take is  
> that
> Apple should have their own build script which passes "make"  
> whichever file
> they want to use as the makefile, so then it doesn't need a special  
> name
> like GNUmakefile.  Actually, doesn't Apple use a build script already?
>
We use GNUmakefile to trigger using the build_gcc script. 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. :-)

-bw