Calculating correct values of mem_top, mem_range, stack_address, stack_direction and page_width for gcl on Hurd

[Svante Signell]

Hi,

gcl use the attached program, extracted from configure.in, to
calculate mem_top, mem_range, stack_address, stack_direction and
page_width for that package. (Unfortunately I don't understand parts of
the code)

Unfortunately some values are wrong for GNU/Hurd. In order to hardcode
them (to see if the application packages like maxima can run properly)
I need to know the correct/safe (maybe empirical) values.

On Hurd:
page_width=12
stack_direction=-1
stack_address=0xfffffff
mem_top=0x80000000
mem_range=0x40000000

Empirically, with a max memory of 1980 MiB, that gives
mem_top=0x7bc00000 (Using this value does not change anything when
building maxima, it hangs with a corrupt stack/memory corruption/other)

Are the other calculated values correct?

On Linux (amd64):
page_width=12
stack_direction=-1
stack_address=0x7fff2fffffff
mem_top=0x8000000000000000
mem_range=0x40000000

test_mem_top.c
Description: Text Data