Makecontext - backward compatibilty from Soalris 10 and 9

Hi all,
As I understand it, The makecontext() function was apperantley changed in Solaris 9, in the following ways, that are clearly related to each other:
void makecontext(ucontext_t *ucp, void(*func)(), int argc, ...);
1) argc is now repersenitng the exact number of arguments that func expects, instead of the arguments num + 1.
2) The ss_sp member of the uc_stack structure now
represents the base (low memory address) of
the area reserved for the stack , in keeping with
other uses of ss_sp. Prior to 9 version it represented the high memory address .
In Solaris 9 the flag: -D__MAKECONTEXT_V2_SOURCE was required in compile time in order to get the correct usage as well as modifying the source with the following lines:
uc.uc_stack.ss_sp = mmap(0, sz,
PROT_READ | PROT_WRITE | PROT_EXEC,
MAP_PRIVATE | MAP_ANON, -1, 0);
- uc.uc_stack.ss_sp = (char *)uc.uc_stack.ss_sp + sz - 8;
uc.uc_stack.ss_size = sz;
uc.uc_stack.ss_flags = 0;
I understand the in Soaris 10, the changes are applied with the need for the flago nor the additional code.
Apperantley the libraries compiled with the changes on 2.9 machine are not backward compatible on older versions of Solaris. My question is whether code compiled and build in Solaris 10 will be comaptible with older version, in means of makecontext() usage.

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