Package: mesa-opencl-icd Version: 13.0.5-1 Severity: important Tags: upstream patch
LLVM versions before v5 contain a known language bug, involving the use of pointers as boolean values, which makes them essentially unusable for openCL: https://bugs.llvm.org/show_bug.cgi?id=30217 https://reviews.llvm.org/D29038 https://reviews.llvm.org/rL294313 For an example of the problems this causes, see here: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=848258 https://developer.blender.org/T50522 a trivial test case illustrating the bug: $ cat ptr-expr2.c int ptr_expr(int *p) { if (!p) return(0); else return(1); } $ clang-3.9 -x cl -emit-llvm -S ptr-expr2.c ptr-expr2.c:3:9: error: invalid argument type 'int *' to unary expression if (!p) ^~ 1 error generated. $ clang-4.0 -x cl -emit-llvm -S ptr-expr2.c ptr-expr2.c:3:9: error: invalid argument type 'int *' to unary expression if (!p) ^~ 1 error generated. $ clang-5.0 -x cl -emit-llvm -S ptr-expr2.c $ # compilation succeeds possible solutions: - make openCL require LLVM-v5 - backport the bugfix from LLVM-v5 to earlier versions; it is apparently a single line change (see LLVM link above) Until one or other of these solutions is applied, openCL in Mesa is effectively unusable. -- System Information: Debian Release: 9.0 APT prefers testing APT policy: (990, 'testing'), (500, 'stable-updates'), (500, 'unstable'), (500, 'stable') Architecture: amd64 (x86_64) Kernel: Linux 4.9.0-2-amd64 (SMP w/4 CPU cores) Locale: LANG=en_CA.utf8, LC_CTYPE=en_CA.utf8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system) Versions of packages mesa-opencl-icd depends on: ii libc6 2.24-9 ii libclc-amdgcn 0.2.0+git20160907-3 ii libclc-r600 0.2.0+git20160907-3 ii libdrm-amdgpu1 2.4.74-1 ii libdrm-nouveau2 2.4.74-1 ii libdrm-radeon1 2.4.74-1 ii libdrm2 2.4.74-1 ii libelf1 0.168-0.2 ii libexpat1 2.2.0-2 ii libgcc1 1:6.3.0-6 ii libgcrypt20 1.7.6-1 ii libllvm3.9 1:3.9.1-4 ii libsensors4 1:3.4.0-3+b1 ii libstdc++6 6.3.0-6 ii ocl-icd-libopencl1 [libopencl1] 2.2.11-1 mesa-opencl-icd recommends no packages. mesa-opencl-icd suggests no packages. Versions of packages xserver-xorg depends on: ii x11-xkb-utils 7.7+3+b1 ii xkb-data 2.19-1 ii xserver-xorg-core 2:1.19.2-1 ii xserver-xorg-input-evdev [xorg-driver-input] 1:2.10.5-1 ii xserver-xorg-video-radeon [xorg-driver-video] 1:7.8.0-1+b1 Versions of packages xserver-xorg recommends: ii libgl1-mesa-dri 13.0.5-1 Versions of packages xserver-xorg-core depends on: ii keyboard-configuration 1.160 ii libaudit1 1:2.6.7-1 ii libbsd0 0.8.3-1 ii libc6 2.24-9 ii libdbus-1-3 1.10.16-1 ii libdrm2 2.4.74-1 ii libegl1-mesa 13.0.5-1 ii libepoxy0 1.3.1-2 ii libgbm1 13.0.5-1 ii libgcrypt20 1.7.6-1 ii libgl1-mesa-glx [libgl1] 13.0.5-1 ii libpciaccess0 0.13.4-1 ii libpixman-1-0 0.34.0-1 ii libselinux1 2.6-3 ii libsystemd0 232-19 ii libudev1 232-19 ii libxau6 1:1.0.8-1 ii libxdmcp6 1:1.1.2-3 ii libxfont2 1:2.0.1-3 ii libxshmfence1 1.2-1 ii udev 232-19 ii xserver-common 2:1.19.2-1 Versions of packages xserver-xorg-core recommends: ii libgl1-mesa-dri 13.0.5-1 ii libpam-systemd 232-19 Versions of packages xserver-xorg-core suggests: ii xfonts-100dpi 1:1.0.4+nmu1 ii xfonts-75dpi 1:1.0.4+nmu1 ii xfonts-scalable 1:1.0.3-1.1 -- no debconf information
