grovelling +magic-version+ from MAGIC_VERSION in magic.h header file failed!

[guicho271828]

grovelling +magic-version+ from MAGIC_VERSION in magic.h header file failed!

[guicho271828]

Hi could you tell me the version of libmagic you have installed?

[rakhmanu]

Hi could you tell me the version of libmagic you have installed?
Hi @guicho271828 , yes

file-5.38
magic file from /etc/magic:/usr/share/misc/magic

Thank you very much,
Sincerely, Ulzhalgas Rakhman

[guicho271828]

hmm, seeing this line, there has been no change since the last 9 years, so it is not that it is breaking.
https://github.com/file/file/blame/FILE5_38/src/magic.h.in#L116
I wonder if /etc/magic actually contains the header file magic.h (that is the whole point of installing the header file)
and it is included in the CPATH.

[rakhmanu]

@guicho271828, there is magic.h in /etc/, but not in /etc/magic (there is no magic folder). Also, there exists separate magicffi folder. Could you please let me know is there something wrong with directories?

Thank you for your help,
Sincerely, Ulzhalgas Rakhman

[guicho271828]

Have magic.h in the C compiler's include path, aka $CPATH.

[rakhmanu]

@guicho271828 , thank you very much for your help.
That solved my problem. Sorry i forgot to close the issue.

Sincerely, Ulzhalgas Rakhman

[vindarel]

Hi there, could you explain how you solved the issue? I am having this while trying to install magicffi with Quicklisp (note: there are no issue tracker in magicffi).

My system dependencies are:

• libmagic-dev: 1:5.32-2ubuntu0.4
• libc6-dev: 2.27-3ubuntu1.4
• gcc: 4:7.4.0-1ubuntu2.3

and:

$ ls -lh /etc/magic*                             
-rw-r--r-- 1 root root 111 Feb 13  2018 /etc/magic
-rw-r--r-- 1 root root 111 Feb 13  2018 /etc/magic.mime

No /etc/magic directory. I can't see a magic.h file. There is one in /usr/include/magic.h, /usr/include/linux/magic.h and /usr/include/ImageMagick-6/magick/magic.h (and /gnu/store/gfapkk5c6hvl1d94m4sqnhn7f9l5gqyh-linux-libre-headers-5.4.20/include/linux/magic.h, but it shouldn't interfere with my installation).

$ echo $CPATH

So

Have magic.h in the C compiler's include path, aka $CPATH.

how do you do that? (anything else to do from a Common Lisp REPL?)

thank you

[guicho271828]

it seems the installation point varies among systems ... and I am not keen on searching the file from inside common lisp, because it could be brittle. Asking the users to modify and export CPATH would be a surefire way. Anotehr way is to include magic.h in magicffi but that has a danger of having an obsolete file that is different from original libmagic.

[vindarel]

Asking the users to modify and export CPATH would be a surefire way.

I… would welcome an example.

searching the file from inside common lisp, because it could be brittle

I undesrtand. Maybe searching in a few locations? For example, in cl-readline, we search several files:

(define-foreign-library readline
  ;; On OSX we first search readline, installed by brew install readline
  ;; because native system version of readline is a symlink to libedit.
  ;; Some people on the internet advice to "fix" it by running:
  ;; brew link --force readline
  ;; but it is a bad idea, because this command may break some system utilities,
  ;; depending on libedit's internals.
  (:darwin (:or "/usr/local/opt/readline/lib/libreadline.dylib"
                "/opt/homebrew/opt/readline/lib/libreadline.dylib"
                "libreadline.dylib"))
  (:unix   (:or "libreadline.so.6.3"
                "libreadline.so.6"
                "libreadline.so.7"
                "libreadline.so.8"
                "libreadline.so"))
  (t       (:default "libreadline")))

thanks

[vindarel]

editing grovel.lisp to the location of my magic.h did the trick:

(include "/etc/[…]/magic.h")

Best,

[guicho271828]

@vindarel yes, d-f-l has that feature which searches for several possible candidates, but the gloveller doesn't have it.

[guicho271828]

The important difference being whether it's searching for a shared object or a header file

[guicho271828]

I… would welcome an example.

Just export CPATH=/usr/include/linux sbcl

[vindarel]

Thanks for that and the explanation <3