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?
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?
> This however
> would still conflict with GCC when cross-building a native compiler, or
> for a sysrooted Canadian cross. The attached patch could be made to work
> in this scenario if you can afford using --without-build-sysroot.
>
> Another possibility is to have an environment variable which would
> override the command-line options (ick). Then the GCC toplevel can
> set it as they wish.
Ick.
Thanks,
Ralf
> --- a/libltdl/m4/libtool.m4
> +++ b/libltdl/m4/libtool.m4
> @@ -1183,19 +1183,21 @@ AC_DEFUN([_LT_WITH_SYSROOT],
> AC_ARG_WITH([sysroot],
> [ --with-sysroot[=DIR] Search for dependent libraries within DIR
> (or the compiler's sysroot if not specified).],
> -[], [with_sysroot=no])
> +[], [with_sysroot=${with_build_sysroot}])
>
> dnl lt_sysroot will always be passed unquoted. We quote it here
> dnl in case the user passed a directory name.
> lt_sysroot=
> case ${with_sysroot} in #(
> yes)
> - if test "$GCC" = yes; then
> + if test "$GCC" = yes && test "$build" != "$host"; then
> lt_sysroot=`$CC --print-sysroot 2>/dev/null`
> fi
> ;; #(
> /*)
> - lt_sysroot=`echo "$with_sysroot" | sed -e "$sed_quote_subst"`
> + if test "$build" != "$host"; then
> + lt_sysroot=`echo "$with_sysroot" | sed -e "$sed_quote_subst"`
> + fi
> ;; #(
> no|'')
> ;; #(
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