[Pkg-gmagick-im-team] Bug#551017: imagemagick: FTBFS on hurd-i386: wrong PATH_MAX and /proc usage

[Pino Toscano]

Package: imagemagick
Version: 7:6.5.5.3-1
Severity: important
Tags: patch
User: debian-hurd at lists.debian.org
Usertags: hurd

Hi,

as shown in [1], currently imagemagick does not build on GNU/Hurd.
The reason is in magick/utility.c, in the implementation of GetExecutionPath():
Hurd has both getpid() and readlink(), so the
  #if defined(MAGICKCORE_HAVE_GETPID) && defined(MAGICKCORE_HAVE_READLINK)
  [...]
  #endif
code block is used. Although, this block has two problems for Hurd:
- inconditional usage of PATH_MAX (which is not a problem, as it could be fixed)
- use of /proc/$PID/{exe,file}; Hurd's proc have none of those two, so the code
  there would be unuseful anyway

The solution I chose was to exclude that block for Hurd, and add a new
Hurd-specific block which makes use of the GNU-specific program_invocation_name
extern variable (see /usr/include/errno.h) - and cwd if program_invocation_name
is relative - to get the absolute path of the execution application.

[1] http://buildd.debian-ports.org/fetch.php?&pkg=imagemagick&ver=7:6.5.5.3-1&arch=hurd-i386&stamp=1251687730&file=log&as=raw

Thanks,
-- 
Pino
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