Re: Out-of-tree builds

[Rich Felker <dalias@aerifal.cx>]

On Thu, Feb 06, 2014 at 06:39:32PM +0100, Szabolcs Nagy wrote:
> * Oliver Schneider <musl-mailinglist@f-prot.com> [2014-02-06 17:15:21 +0000]:
> > however, then I switch to an empty directory and run this:
> > 
> > ../musl/configure --disable-shared
> > 
> > I get:
> > 
> > using compiler runtime libraries: -lgcc -lgcc_eh
> > checking whether compiler's long double definition matches float.h... no
> > ../musl/configure: error: unsupported long double type
> > 
> > Are out-of-tree builds generally not supported, or am I doing something
> > wrong?
> 
> not supported (yet)
> 
> it probably wouldn't be hard to add though
> 
> (eg the paths in the makefile can be prefixed with the build path
> and the generated config.mak can set that prefix up, but i'm not
> sure what's the best way to detect the path and there might be
> issues around the generated alltypes.h and include/bits)

It's not as easy as it sounds because of the way implicit % rules
work. I don't know how to get them to work when adding a leading path.
If someone can figure out how to do this without doing anything
horribly ugly/bloated/slow in the makefile, I'm open to adding support
for out-of-tree builds this way.

Rich