[Bug gdb/30541] Add target valgrind

["tromey at sourceware dot org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30541

--- Comment #28 from Tom Tromey <tromey at sourceware dot org> ---
I may not really understand the environment issue.

Using Q* to set the environment and the working directory seems
clearly better to me, and in fact the only way it can work
properly.  The problem case is something like:

(gdb) set env X y
(gdb) start
(gdb) add-inferior blah blah
(gdb) set env X z
(gdb) start

Here, we've made 2 inferiors and started them with different environments.
The native target can simply pass this stuff to the inferior via
ordinary setenv stuff.  For remotes, though, the inheritance can
only be done once, other inferiors are not fork'd by gdb.

If Q* aren't working on the gdb side, let's make a new bug and
make it block this one.  If they aren't working on the valgrind side,
I suggest a valgrind bug instead.

A bonus of implementing vFile and Q* in valgrind is that then
"target remote | ssh machine vgdb" will work, which seems nice.

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