Hi,
I just tried to use cvs-1.12.12 on Mac OS X, and it always dies. I traced
the problem to pagealign_alloc.c, which attempts to mmap /dev/zero.
<http://savannah.gnu.org/cgi-bin/viewcvs/*checkout*/gnulib/gnulib/lib/pagealign_alloc.c?rev=HEAD&content-type=text/x-csrc>
As you can see from this little snippet of gcc configure, you can't mmap
/dev/zero on darwin.
AC_CACHE_CHECK([whether mmap from /dev/zero works],
gcc_cv_func_mmap_dev_zero,
[# Add a system to this blacklist if it has mmap() but /dev/zero
# does not exist, or if mmapping /dev/zero does not give anonymous
# zeroed pages with both the following properties:
# 1. If you map N consecutive pages in with one call, and then
# unmap any subset of those pages, the pages that were not
# explicitly unmapped remain accessible.
# 2. If you map two adjacent blocks of memory and then unmap them
# both at once, they must both go away.
# Systems known to be in this category are Windows (all variants),
# VMS, and Darwin.
case "$host_os" in
vms* | cygwin* | pe | mingw* | darwin* | ultrix* | hpux10* | hpux11.00)
gcc_cv_func_mmap_dev_zero=no ;;
*)
gcc_cv_func_mmap_dev_zero=yes;;
esac])
Thanks,
Peter
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