On 10/23/2010 10:01 AM, Ralf Wildenhues wrote:
Hi Paolo,
* Paolo Bonzini wrote on Sat, Oct 23, 2010 at 09:38:43AM CEST:
Also, libtool should probably ignore --with-sysroot if build==host;
native compilers are never build with a sysroot in practice.
OK, so this would mean there is no way --with-sysroot could be (ab)used
to fix the DESTDIR (re)link failures that libtool users experience
today. Desired side-effect?
No, do you have a pointer? I don't understand what failure is there
that cannot be fixed by --enable-fast-install (so that relink doesn't
happen at install time), no?
The rest of your proposed patch could also be wrapped in
gcc/configure.ac, I'm not sure whether it belongs there rather than in
Libtool?
I don't recall if binutils needs to know about a sysroot.
Another solution is to do the following renaming in GCC
--with-sysroot -> --enable-sysroot
--with-build-sysroot -> --with-target-sysroot
(not existing) -> --with-host-sysroot
The task of mapping from old to new arguments is given to the toplevel
configure script; subdirectories _never_ see a $with_sysroot with a
meaning other than the one Libtool uses. To do this, the toplevel
configure simply has to mangle the {host,build,target}_configure_args to
include the correct args:
--without-sysroot for build_configure_args
--with-sysroot=${with_host_sysroot:-no}
--enable-sysroot=${with_sysroot:-${enable_sysroot:-no}}
for host_configure_args
--with-sysroot=${with_target_sysroot:-${with_build_sysroot:-no}}
for target_configure_args.
The patch should be relatively small, so OE can backport it to 4.5 if
they wish. Adjusting the docs and selling the idea on gcc@ is probably
harder than writing it.
Paolo
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