Re: [dpdk-dev] [PATCH v2] ifpga/base/meson: fix looking for librt

["Zhang, Tianfei" <tianfei.zhang@intel.com>]

> 
> Hi Tianfei,
> 
> To reproduce this, assume using Ubuntu 20.04.
> 1. Install libfdt (It will include ifpga driver from drivers/raw/ifpga/base)
>     $ sudo apt-get install libfdt-dev
> 2. configure DPDK library
>     $ meson build
> 3. check libdpdk.pc file in build/meson-private/libdpdk.pc. It will include path
> to librt.so without this patch.

I have checked the libdpdk.pc and got the different between with and without this patch.
Without this patch, there are a full path for librt.so in libdpdk.pc. With this patch, it provide "-lrt" in libdpdk.pc.

This patch looks good for me.

Acked-by: Tianfei Zhang <Tianfei.zhang@intel.com>

> 
> Regards,
> Alim Hussin
> 
> -----Original Message-----
> From: Zhang, Tianfei <tianfei.zhang@intel.com>
> Sent: Thursday, July 1, 2021 9:19 PM
> To: Xu, Rosen <rosen.xu@intel.com>; Hussin, Mohamad Noor Alim
> <mohamad.noor.alim.hussin@intel.com>
> Cc: dev@dpdk.org; Huang, Wei <wei.huang@intel.com>; stable@dpdk.org
> Subject: RE: [PATCH v2] ifpga/base/meson: fix looking for librt
> 
> 
> 
> > -----Original Message-----
> > From: Xu, Rosen <rosen.xu@intel.com>
> > Sent: 2021年6月30日 18:03
> > To: Hussin, Mohamad Noor Alim <mohamad.noor.alim.hussin@intel.com>;
> > Zhang, Tianfei <tianfei.zhang@intel.com>
> > Cc: dev@dpdk.org; Huang, Wei <wei.huang@intel.com>; stable@dpdk.org
> > Subject: RE: [PATCH v2] ifpga/base/meson: fix looking for librt
> >
> > CC Tianfei, who is maintainer.
> >
> > > -----Original Message-----
> > > From: Hussin, Mohamad Noor Alim
> > <mohamad.noor.alim.hussin@intel.com>
> > > Sent: Wednesday, June 30, 2021 17:26
> > > To: Xu, Rosen <rosen.xu@intel.com>
> > > Cc: dev@dpdk.org; Hussin, Mohamad Noor Alim
> > > <mohamad.noor.alim.hussin@intel.com>; Huang, Wei
> > > <wei.huang@intel.com>; stable@dpdk.org
> > > Subject: [PATCH v2] ifpga/base/meson: fix looking for librt
> > >
> > > Finding with "librt" keyword would give the output with full path of
> > > librt such as
> > > /usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/librt.so
> > > instead of -lrt in libdpdk.pc pkg-config file.
> > >
> > > Assume find_library() will prepend "lib", thus remove "lib" from "librt"
> > > keyword. The output will shows as -lrt.
> > >
> > > This will cause an issue when compile DPDK app with static library
> > > as the path of librt has been hard-coded in the libdpdk.pc file.
> 
> How to reproduce this issue?
> 
> > >
> > > Fixes: e41856b515ce ("raw/ifpga/base: enhance driver reliability in
> > > multi-
> > > process")
> > > Cc: wei.huang@intel.com
> > > Cc: stable@dpdk.org
> > >
> > > Signed-off-by: Mohamad Noor Alim Hussin
> > > <mohamad.noor.alim.hussin@intel.com>
> > > ---
> > >  drivers/raw/ifpga/base/meson.build | 2 +-
> > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > >
> > > diff --git a/drivers/raw/ifpga/base/meson.build
> > > b/drivers/raw/ifpga/base/meson.build
> > > index 8d27c6021..ce592a13a 100644
> > > --- a/drivers/raw/ifpga/base/meson.build
> > > +++ b/drivers/raw/ifpga/base/meson.build
> > > @@ -27,7 +27,7 @@ sources = [
> > >
> > >  rtdep = dependency('librt', required: false)  if not rtdep.found()
> > > -    rtdep = cc.find_library('librt', required: false)
> > > +    rtdep = cc.find_library('rt', required: false)
> > >  endif
> > >  if not rtdep.found()
> > >      build = false
> > > --
> > > 2.17.1