[Bug build/19302] Cannot cross-build a fully functional native djgpp gdb

[palves at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=19302

--- Comment #4 from Pedro Alves <palves at redhat dot com> ---
> It doesn't.

Yeah, I was assuming you'd configure/build gcc with --{host,target}=djgpp. 
Then it would work.

> What is "libsubdir" supposed to be anyway?

As I said, that file is maintained on the gcc repo, by the gcc folks.  So check
the gcc repo.  Grepping for "^libsubdir ="' on the gcc repo's shows hits like:

fixincludes/Makefile.in:libsubdir =
$(libdir)/gcc/$(target_noncanonical)/$(gcc_version)
gcc/Makefile.in:libsubdir =
$(libdir)/gcc/$(real_target_noncanonical)/$(version)$(accel_dir_suffix)
libgcc/Makefile.in:libsubdir =
$(libdir)/gcc/$(real_host_noncanonical)/$(version)@accel_dir_suffix@
libjava/Makefile.am:libsubdir =
$(libdir)/gcc/$(target_noncanonical)/$(gcc_version)
libjava/Makefile.in:libsubdir =
$(libdir)/gcc/$(target_noncanonical)/$(gcc_version)
libobjc/Makefile.in:libsubdir =
$(libdir)/gcc/$(target_noncanonical)/$(gcc_version)
...

target_noncanonical here will be the same as target_alias, I think.

Seems to me that the real fix is to change these places to take djgpp's special
requirement in consideration, rather than hacking target_alias.  To avoid ifs
all of the place, maybe pass around a new variable like e.g.,
"$target_libsubdir" that defaults to $target_noncanonical everywhere except 
djgpp, which would override it to "djgpp".

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