Re: [dpdk-dev] [PATCH v6 2/5] build: use dependency() instead of find_library()

[Thomas Monjalon <thomas@monjalon.net>]

12/02/2019 12:43, Bruce Richardson:
> On Tue, Feb 12, 2019 at 12:36:17PM +0100, Thomas Monjalon wrote:
> > 12/02/2019 12:31, Bruce Richardson:
> > > On Tue, Feb 12, 2019 at 12:15:43PM +0100, Thomas Monjalon wrote:
> > > > 06/02/2019 18:08, Luca Boccassi:
> > > > > Whenever possible (if the library ships a pkg-config file) use meson's
> > > > > dependency() function to look for it, as it will automatically add it
> > > > > to the Requires.private list if needed, to allow for static builds to
> > > > > succeed for reverse dependencies of DPDK. Otherwise the recursive
> > > > > dependencies are not parsed, and users doing static builds have to
> > > > > resolve them manually by themselves.
> > > > > When using this API avoid additional checks that are superfluous and
> > > > > take extra time, and avoid adding the linker flag manually which causes
> > > > > it to be duplicated.
> > > > > 
> > > > > Signed-off-by: Luca Boccassi <bluca@debian.org>
> > > > > Acked-by: Bruce Richardson <bruce.richardson@intel.com>
> > > > 
> > > > This patch breaks compilation on my machine with a lot of strange errors:
> > > > 
> > > > from drivers/net/pcap/rte_eth_pcap.c
> > > > 
> > > > /usr/include/stdint.h:109: error: "__INT64_C" redefined
> > > > /usr/include/bits/stdlib-bsearch.h:32:13: error: cast discards 'const' qualifier from pointer target type
> > > > /usr/include/pthread.h:682:6: error: 'regparm' attribute directive ignored
> > > > etc
> > > >
> > > Is this on Arch linux again? I just reverified these first two patches and
> > > they work fine for me on Fedora (I assume Luca probably tested them already on
> > > Debian) 
> > > 
> > > Anything unusual about your setup?
> > 
> > Nothing unusual. Just using the best environment ever ;)
> > I will try to debug it.
> > 
> It may be something pcap-specific, since pcap has to have it's own special
> query mechanims outside the normal pkg-config one. If you remove the
> pcap-driver changes, does the rest of the patch work for you?

Yes, the issue happens only with pcap on Arm.
Reverting the pcap related changes, it builds fine.

More infos about my setup:
	meson-0.49.1
	aarch64-linux-gnu-gcc-8.2.0
	libpcap-1.9.0 (32 and 64-bit) for x86

I think there is a mix between libcap for x86 and Arm compilation.
Probably a meson bug?