/usr/bin/ld: this linker was not configured to use sysroots

[Thomas Schwinge <tschwinge at gnu dot org>]

Hello!

#v+
$ gcc --sysroot=[...] [...]
/usr/bin/ld: this linker was not configured to use sysroots
collect2: ld returned 1 exit status
#v-

Okay, fine, it's also documented that way:

#v+
@kindex --sysroot
@item --sysroot=@var{directory}
Use @var{directory} as the location of the sysroot, overriding the
configure-time default.  This option is only supported by linkers
that were configured using @option{--with-sysroot}.
#v-

But now my question is: why?  Why am I not allowed to use it
unconditionally?  I have the following use case in mind: build glibc and
install it using ``make prefix=[...]/test-install install'' and then use
``gcc --sysroot=[...] [...]'' to build against that glibc.  For GCC
proper this seems to be working: the header files are read from
`[...]/test-install/'.  But why is GLD special?


Regards,
 Thomas

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