[Bug 1942895] Re: Build fails on riscv64

[Alexandre Ghiti]

Patch was applied upstream
(https://github.com/pocl/pocl/commit/9bd3b404a2ac307b0f238970381c4265a5b734f4)
and bug report was open in debian (https://bugs.debian.org/cgi-
bin/bugreport.cgi?bug=994797).

The attached debdiff was updated with DEP-3 header and debian version
numbering.

** Bug watch added: Debian Bug tracker #994797
   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=994797

** Patch added: "pocl_debdiff.patch"
   https://bugs.launchpad.net/ubuntu/+source/pocl/+bug/1942895/+attachment/5526568/+files/pocl_debdiff.patch

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Title:
  Build fails on riscv64

Status in pocl package in Ubuntu:
  In Progress

Bug description:
  Ubuntu release: hirsute/impish

  pocl gets the host machine cache line size using
  getconf(LEVEL1_DCACHE_LINESIZE) and when this value is not defined by
  the underlying architecture, glibc returns 0 which is correctly
  handled by pocl CMakeLists.txt. But riscv64 defines this system
  variable since glibc 2.33 (cf commit 15b38ffc104a ("riscv: Get cache
  information through sysconf")) and amd64 does not. Then when using
  qemu usermode emulation to build pocl for riscv64 on an amd64 host,
  this system variable is not created and then the riscv implementation
  now returns -1 instead of 0, which is mapped to the string "undefined"
  by getconf utility. This value is not handled by pocl and then the
  build fails.

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