[Bug sanitizer/82824] [8 regression] libsanitizer fails to build: VM_MEMORY_OS_ALLOC_ONCE undefined

[egallager at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82824

--- Comment #3 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to ro@CeBiTec.Uni-Bielefeld.DE from comment #2)
> > --- Comment #1 from Eric Gallager <egallager at gcc dot gnu.org> ---
> [...]
> > Apparently 10.6/Darwin 11 isn't supported either; see bug 82829. As I said
> 
> I couldn't find an explicit statement of support (or non-support) for
> LLVM on Darwin.  However, we could either try to get patches upstream
> or keep them gcc-local if they are as trivial as those two.
> 
> > there, it'd really be nice to have a --disable-libsanitizer configure flag
> > for whenever upstream breaks stuff again
> 
> Your wish has already been granted: for most if not all target
> libraries, there's already a --disable-libX/--enable-libX switch,
> libsanitizer included.

Really? It doesn't show up in the ./configure --help output:

Local-Admins-MacBook-Pro:gcc ericgallager$ ./configure --help=recursive | grep
-i sanit
Report bugs to <libsanitizer>.
Local-Admins-MacBook-Pro:gcc ericgallager$

> 
> However, this isn't the right way to handle this: if it's really
> concluded that libsanitizer isn't supported on certain Darwin versions,
> this should be handled in libsanitizer/configure.tgt so users don't get
> failing bootstraps without non-default options.
> 
> 	Rainer