Warning compiling on 32bit ARM systems: No cycleclock() definition for your platform

[fingolfin]

This doesn't seem to be a serious problem (for now, anyway), and of course this platform is Tier 3.. But I thought it would be good to highlight. Perhaps this way someone who cares about ARM 32bit sees it and is motivated to work on a fix :-)

Here is an example observed on armv6l-linux-gnueabihf-cxx11 via Yggdrasil

[14:11:19] In file included from /workspace/srcdir/julia/src/gc.h:18:0,
[14:11:19]                  from /workspace/srcdir/julia/src/gc-debug.c:3:
[14:11:19] /workspace/srcdir/julia/src/julia_internal.h: In function 'cycleclock':
[14:11:19] /workspace/srcdir/julia/src/julia_internal.h:226:6: warning: #warning No cycleclock() definition for your platform [-Wcpp]
[14:11:19]      #warning No cycleclock() definition for your platform
[14:11:19]       ^~~~~~~

[fingolfin]

I am trying out a potential patch in JuliaPackaging/Yggdrasil#5506 (stolen from elsewhere), if that works out I'll submit a PR (but I won't try hard if it doesn't work...)