[ruby-core:98716] Ruby 2.7.x coroutine support on 32 bit PowerPC e500v2

I am trying to cross compile Ruby 2.7.1 using buildroot on PPC/32, and
am able to only do that using the  --with-coroutine=copy suboptimal
configure option.

I understand that this option is far from optimal - especially because
the actual HW platform is a single core MPC8548e PPC/32 e500v2/spe
processor.

Where do the coroutine sources come from? Is there a ppc/32 variant in
that original repo?

When I do NOT use copy (the library configured is uclibc 1.0.32) the
following error messages are shown:

compiling coroutine/ucontext/Context.c
compiling mjit.c
In file included from coroutine/ucontext/Context.c:14:0:
coroutine/ucontext/Context.h:22:5: error: unknown type name 'ucontext_t'
     ucontext_t state;
     ^~~~~~~~~~
In file included from coroutine/ucontext/Context.c:14:0:
coroutine/ucontext/Context.h: In function 'coroutine_initialize_main':
coroutine/ucontext/Context.h:32:5: warning: implicit declaration of
function 'getcontext' [-Wimplicit-function-declaration]
     getcontext(&context->state);
     ^~~~~~~~~~
In file included from coroutine/ucontext/Context.c:14:0:
coroutine/ucontext/Context.h: In function 'coroutine_initialize':
coroutine/ucontext/Context.h:45:19: error: request for member
'uc_stack' in something not a structure or union
     context->state.uc_stack.ss_size = size;
                   ^
coroutine/ucontext/Context.h:47:19: error: request for member
'uc_stack' in something not a structure or union
     context->state.uc_stack.ss_sp = (char*)stack;
                   ^
coroutine/ucontext/Context.h:48:19: error: request for member
'uc_stack' in something not a structure or union
     context->state.uc_stack.ss_flags = 0;
                   ^
coroutine/ucontext/Context.h:49:19: error: request for member
'uc_link' in something not a structure or union
     context->state.uc_link = NULL;
                   ^
In file included from coroutine/ucontext/Context.c:14:0:
coroutine/ucontext/Context.h:51:5: warning: implicit declaration of
function 'makecontext' [-Wimplicit-function-declaration]
     makecontext(&context->state, (void(*)(void))coroutine_trampoline,
2, (void*)start, (void*)context);
     ^~~~~~~~~~~
In file included from coroutine/ucontext/Context.c:14:0:
coroutine/ucontext/Context.h: In function 'coroutine_transfer':
coroutine/ucontext/Context.h:59:5: warning: implicit declaration of
function 'swapcontext' [-Wimplicit-function-declaration]
     swapcontext(&current->state, &target->state);
     ^~~~~~~~~~~
coroutine/ucontext/Context.h: In function 'coroutine_destroy':
coroutine/ucontext/Context.h:67:19: error: request for member
'uc_stack' in something not a structure or union
     context->state.uc_stack.ss_sp = NULL;
                   ^
In file included from coroutine/ucontext/Context.c:14:0:
coroutine/ucontext/Context.h:68:19: error: request for member
'uc_stack' in something not a structure or union
     context->state.uc_stack.ss_size = 0;
                   ^
Makefile:420: recipe for target 'coroutine/ucontext/Context.o' failed
make[2]: *** [coroutine/ucontext/Context.o] Error 1
make[2]: *** Waiting for unfinished jobs....
package/pkg-generic.mk:266: recipe for target
'/root/build/buildroot-top/buildroot/output/build/ruby-2.7.1/.stamp_built'
failed
make[1]: *** [/root/build/buildroot-top/buildroot/output/build/ruby-2.7.1/.stamp_built]
Error 2
buildroot/Makefile:84: recipe for target '_all' failed
make: *** [_all] Error 2

- Maurice

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