M_PI (and related constants) are required by 184.108.40.206 in the OpenCL 2.0 C specification.
I am using the Debian package of beignet 0.13:
-- System Information:
Debian Release: 9.0
APT prefers testing
APT policy: (990, 'testing'), (500, 'stable-updates'), (500, 'unstable'), (500, 'stable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386
Kernel: Linux 4.9.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
Versions of packages beignet-opencl-icd:amd64 depends on:
ii libc6 2.24-8
ii libdrm-intel1 2.4.74-1
ii libdrm2 2.4.74-1
ii libgcc1 1:6.2.1-5
ii libllvm3.9 1:3.9.1-1
ii libstdc++6 6.2.1-5
ii libx11-6 2:1.6.4-2
ii libxext6 2:1.3.3-1
ii libxfixes3 1:5.0.3-1
beignet-opencl-icd:amd64 recommends no packages.
beignet-opencl-icd:amd64 suggests no packages.
-- no debconf information
M_PI is the double precision constant, and double precision isn't supported in a default (upstream or Debian) build of Beignet; use the single precision versions (M_PI_F etc) instead.
(Though as they appear to be missing even when double precision is turned on (EXPERIMENTAL_DOUBLE CMake option), this is still a bug.)
Thanks for you bug report, we have EXPERIMENTAL_DOUBLE options is because of we have not finished all of the double type built-in functions.
And M_PI seems to be one of the unfinished part, we will announce you once double type is full supported.
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