package/uhd: fix usrp2 build

From: Gwenhael Goavec-Merou <gwenhael.goavec-merou@trabucayre.com>

Fix build failure:
uhd-3.15.0.0/host/lib/usrp/usrp2/usrp2_impl.cpp:847:29: error: 'boost::math' has not been declared
for boost::math::sign and boost::math::iround

Backport and adapt commits:
- 3796175f32f0cc24c16809d8175d423bc7053de9
- d1c6290fe9c8b01068abfca6f272e2a1e031b9de

Fixes:
- http://autobuild.buildroot.net/results/aa2bd1fbe1b4880aa8de389238380a3d35f80b53/

Signed-off-by: Gwenhael Goavec-Merou <gwenhael.goavec-merou@trabucayre.com>
---
 ...ost-math-iround-math-sign-with-std-l.patch | 56 +++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 package/uhd/0006-usrp2-Replace-boost-math-iround-math-sign-with-std-l.patch

Gwenael, All,

On 2021-09-30 11:55 +0200, Gwenhael Goavec-Merou spake thusly:
> From: Gwenhael Goavec-Merou <gwenhael.goavec-merou@trabucayre.com>
> 
> Fix build failure:
> uhd-3.15.0.0/host/lib/usrp/usrp2/usrp2_impl.cpp:847:29: error: 'boost::math' has not been declared
> for boost::math::sign and boost::math::iround
> 
> Backport and adapt commits:
> - 3796175f32f0cc24c16809d8175d423bc7053de9
> - d1c6290fe9c8b01068abfca6f272e2a1e031b9de

Please backport the two commits in separate patches: do not coalesce
them in a single patch.

Also, each backported commit should also carry your SoB and a terse info
that is is a backport, see below...

> Fixes:
> - http://autobuild.buildroot.net/results/aa2bd1fbe1b4880aa8de389238380a3d35f80b53/
> 
> Signed-off-by: Gwenhael Goavec-Merou <gwenhael.goavec-merou@trabucayre.com>
> ---
>  ...ost-math-iround-math-sign-with-std-l.patch | 56 +++++++++++++++++++
>  1 file changed, 56 insertions(+)
>  create mode 100644 package/uhd/0006-usrp2-Replace-boost-math-iround-math-sign-with-std-l.patch
> 
> diff --git a/package/uhd/0006-usrp2-Replace-boost-math-iround-math-sign-with-std-l.patch b/package/uhd/0006-usrp2-Replace-boost-math-iround-math-sign-with-std-l.patch
> new file mode 100644
> index 0000000000..d2460dfd35
> --- /dev/null
> +++ b/package/uhd/0006-usrp2-Replace-boost-math-iround-math-sign-with-std-l.patch
> @@ -0,0 +1,56 @@
> +From 025e8a9e9334ea1111003e3b42c75fcb3036c639 Mon Sep 17 00:00:00 2001
> +From: StefanBruens <stefan.bruens@rwth-aachen.de>
> +Date: Wed, 5 May 2021 18:24:58 +0200
> +Subject: [PATCH] usrp2: Replace boost::math::iround/math::sign with
> + std::lround
> +
> +Instead of multiplying zone with the sign repeatedly just make
> +the zone a signed value.
> +
> +See #437, #438
> +
> +Signed-off-by: Aaron Rossetto <aaron.rossetto@ni.com>

Here, belowe the SoB by Aaron, you'd add something like:

    [gwenj@trabucayre.com: backport from upstream]
    Signed-off-by: Gwenhael Goavec-Merou <gwenj@trabucayre.com>

Note: no need to repeat the upstream commit hash here: it is already
visible in the patch headers. But of course, the one you have here does
not exist in the upstream tree.

Regards,
Yann E. MORIN.

> +---
> + host/lib/usrp/usrp2/usrp2_impl.cpp | 10 +++++-----
> + 1 file changed, 5 insertions(+), 5 deletions(-)
> +
> +diff --git a/host/lib/usrp/usrp2/usrp2_impl.cpp b/host/lib/usrp/usrp2/usrp2_impl.cpp
> +index 1be4c7339..41bd0fa89 100644
> +--- a/host/lib/usrp/usrp2/usrp2_impl.cpp
> ++++ b/host/lib/usrp/usrp2/usrp2_impl.cpp
> +@@ -22,6 +22,7 @@
> + #include <boost/asio/ip/address_v4.hpp>
> + #include <boost/asio.hpp> //used for htonl and ntohl
> + #include <boost/thread.hpp>
> ++#include <cmath>
> + 
> + using namespace uhd;
> + using namespace uhd::usrp;
> +@@ -844,20 +845,19 @@ double usrp2_impl::set_tx_dsp_freq(
> +         _tree->access<double>("/mboards/"+mb+"/tick_rate").get();
> + 
> +     //calculate the DAC shift (multiples of rate)
> +-    const int sign = boost::math::sign(new_freq);
> +-    const int zone = std::min(boost::math::iround(new_freq/tick_rate), 2);
> +-    const double dac_shift = sign*zone*tick_rate;
> ++    const int zone         = std::max(std::min<int>(std::lround(new_freq / tick_rate), 2), -2);
> ++    const double dac_shift = zone*tick_rate;
> +     new_freq -= dac_shift; //update FPGA DSP target freq
> +     UHD_LOG_TRACE("USRP2",
> +         "DSP Tuning: Requested " + std::to_string(freq_/1e6) + " MHz, Using "
> +-        "Nyquist zone " + std::to_string(sign*zone) + ", leftover DSP tuning: "
> ++        "Nyquist zone " + std::to_string(zone) + ", leftover DSP tuning: "
> +         + std::to_string(new_freq/1e6) + " MHz.");
> + 
> +     //set the DAC shift (modulation mode)
> +     if (zone == 0) {
> +         _mbc[mb].codec->set_tx_mod_mode(0); //no shift
> +     } else {
> +-        _mbc[mb].codec->set_tx_mod_mode(sign*4/zone); //DAC interp = 4
> ++        _mbc[mb].codec->set_tx_mod_mode(4/zone); //DAC interp = 4
> +     }
> + 
> +     return _mbc[mb].tx_dsp->set_freq(new_freq) + dac_shift; //actual freq
> +-- 
> +2.32.0
> +
> -- 
> 2.30.2
> 
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