generator.h: Generators require coroutines

[jsarenik]

$ uname -a
Linux singer 5.10.61-0-lts #1-Alpine SMP Thu, 26 Aug 2021 17:42:24 +0000 x86_64 GNU/Linux
$ git clone git://git.ozlabs.org/~ccan/ccan
$ cd ccan
$ git rev-parse --short HEAD
fc29adfb
$ make
...
cc -g3 -ggdb -Wall -Wstrict-prototypes -Wold-style-definition -Wundef -Wmissing-prototypes -Wmissing-declarations -Wpointer-arith -Wwrite-strings -DCCAN_STR_DEBUG=1 -I.  -MMD -MP -MFccan/generator/generator.o.d -MTccan/generator/generator.o -c ccan/generator/generator.c -o ccan/generator/generator.o
In file included from ccan/generator/generator.c:8:
./ccan/generator/generator.h:23:2: error: #error Generators require coroutines
   23 | #error Generators require coroutines
      |  ^~~~~
make: *** [Makefile:32: ccan/generator/generator.o] Error 1

[jsarenik]

Generally I just wanted to compile ccan and run make check to see if it works on musl-libc. It seems to not work there really. Yes, again I just have some issue with c-lightning.

[dgibson]

Well, generators do fundamentally require coroutines. The coroutine module requires HAVE_UCONTEXT, so I'm guessing musl-libc isn't supplying that. Fixing that is probably non-trivial.

[jsarenik]

How could I skip coroutines then?

[spikeh]

I have the same issue. I can work around it by deleting ccan/generator/generator.{h,c} but is there a better solution?

I'm building with GCC with --std=gnu99. Is the expectation that I need C++20?