Hello Eric,

I had made the mods to this and done some light testing - then got side-tracked by other priorities.
however, since the topic has come up on the list:

On 6 Nov 2013, at 12:57, Eric Botcazou wrote:

>> I've been trying to improve the building and testing of Darwin for crosses
>> and native crosses.

>> 1. xgnatugn needs to be run on the build system, so needs to be built with
>> the build system's gnatmake. I haven't put a canonical prefix on this since
>> this doesn't appear to be done elsewhere. Defined as GNATMAKE_FOR_BUILD and
>> passed to sub-processes.
> 
> Why do you need to pass it to ADA_TOOLS_FLAGS_TO_PASS though?  Just replace 
> $(GNATMAKE) with gnatmake.
done (FWIW, I think that GNATMAKE_FOR_BUILD would make it obvious for a future reader, but not a big deal)

>> 2. Some builds might need to pass LDFLAGS to the gnat* builds.  Appended
>> LDFLAGS to GCC_LINK.  Passed on in gnattools/Make.
> 
> OK.
> 
>> 3. In gnattools, the RTS dir must be for the host and not for the build; 
>> This actually only showed up when I tried a cross from a 64bit pointer
>> machine to a 32bit pointer one (i.e it is easy for it to go unnoticed).
> 
> OK, but don't you need to do the same for gnatmake/gnatbind/gnatlink here?
> See gcc-interface/Make-lang.in, line 171 and below, for similar code.

it did appear odd that one path had the test and the other did not, however the comment on the native-x case is somewhat misleading since it implies (at least to me) that the *intention* is to use the newly-built target(=host) lib?

In the current patch this is changed to place the test and setting RTS_DIR to cover both native and canadian X cases, at least this should be safe.

Note that I have *not* tested any canadian-crosses, just cross and native-cross, if you need someone to do a canadian X before this is applied, let me know, and I'll try to set something up. (unless it gets covered by Alan or Bernd's cases).

I am re-testing the attached, rebased to tot, but that will take a while, given the machines I have available, 

OK to apply if [cross & native-cross] testing passes?

(if the other folks doing cross-build stuff want to incorporate/take this on, that's OK too).
Iain