[Pkg-opencl-devel] Bug#857710: libclc-dev: some math functions missing; please upgrade to newer version

[Ian Bruce]

Package: libclc-dev
Version: 0.2.0+git20160907-3
Severity: important

3D rendering with Blender is one of the most important potential uses
for openCL, among programs in the Debian archive. Currently this is not
working; see here, for example:

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=848258

Among other problems (which are also being worked on), these compiler
warnings are visible:

    implicit declaration of function 'lgamma' is invalid in C99

    implicit declaration of function 'native_tan' is invalid in C99

If other errors had not terminated compilation, these warnings would
have eventually turned into linker errors. These functions have only
recently been implemented in libclc, and the version in Debian "testing"
is not recent enough to include them:

    $ cd /usr/include/clc/
    $ 
    $ find . -type f -exec grep lgamma {} \; -print
    $ 
    $ find . -type f -exec grep native_tan {} \; -print
    $ 

These are the relevant development commits:

http://llvm.org/viewvc/llvm-project?view=revision&revision=281565

http://llvm.org/viewvc/llvm-project?view=revision&revision=295920

equivalently:

https://github.com/llvm-mirror/libclc/commit/07fa4ae82da5fa75af174f30c498ff160bbf8644

https://github.com/llvm-mirror/libclc/commit/a2593ed8adbf7386f88dfc828cfc32f788ec3983

It appears that the version of libclc in Debian "experimental" includes
lgamma(), but not native_tan(), which only became available a few weeks
ago:

https://packages.debian.org/experimental/all/libclc-dev/filelist

Please upgrade the libclc package in the main Debian archive to a newer
version, which includes both of the above development commits, so that
GPU rendering with openCL will start working.



-- 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)

-- no debconf information