[yocto] ClamAV PCRE support

[Tom Gibson]

Hi Anuj

Thanks for your e-mail.

> -----Original Message-----
> From: Anuj Mittal <anuj.mittal at intel.com>
> Sent: 30 March 2018 11:16
> To: Tom Gibson <tom.gibson at csoftware.co.uk>; yocto at yoctoproject.org
> Subject: Re: [yocto] ClamAV PCRE support
> 
> >     When I run clamscan on our board I get a number of errors of the
> >     form "logical signature for ... uses PCREs but support is disabled,
> >     skipping" so the solution would appear to be to add PCRE support. In
> >     the ClamAV bitbake recipe I see there is a PACKAGECONFIG variable
> >     for PCRE, so to test if this is the solution I have added the
> >     following to my local.conf:
> >
> >
> >
> >     PACKAGECONFIG_append_pn-clamav = " pcre"
> >
> >
> >
> >     and have also added " libpcre2" before "clamav" in the IMAGE_INSTALL
> >     as above.
> 
> This shouldn't be necessary, PACKAGECONFIG adds DEPENDS on libpcre
> when pcre is enabled and only of two should be required.
> 

I have removed the reference to "libpcre2" in the IMAGE_INSTALL variable, I assume I should still include the reference to "pcre" in packageconfig as above.

> >
> >
> >
> >     Unfortunately when I run bitbake I now get a configure error similar
> >     to the following:
> >
> >
> >
> >     configure: error: cannot locate libpcre2 or libpcre at
> >
> > <builddir>/tmp/work/armv7a-neon-poky-linux-gnueabi/clamav/0.99.3-
> r0/re
> > cipe-sysroot/usr/lib
> >
> 
> This is happening because clamav is looking for pcre-config (uses it to find
> pcre paths) and it's not able to locate it ...
> 
> Even if you do get around this error by passing the path to configure, using
> binconfig files to evaluate paths has been disabled in OE-core layer.
> 
> So, you will have to fix the configure/pcre.m4 file in clamav to do this using
> .pc file from libpcre instead.
> 

Sorry, I'm not clear on which file needs fixing? I can only find pcre.m4 at

	<builddir>tmp/work/armv7a-neon-poky-linux-gnueabi/clamav/0.99.2-r0/git/m4/reorganization/libs/pcre.m4

Isn't this generated during build? I'm sorry I'm also not clear on what needs changing, where can I find the correct .pc file for libpcre?

Thanks for your help.

Regards,

Tom