package/gnuradio: backport patch to fix INTERFACE_INCLUDE_DIRECTORIES

gnuradio-runtimeTargets.cmake and gnuradio-pmtTargets.cmake are filled
using CMAKE_INSTALL_PREFIX for INSTALL_INTERFACE.

Since CMAKE_INSTALL_PREFIX, in buildroot, is set to /usr, these files contains
path to host system.

With BR2_COMPILER_PARANOID_UNSAFE_PATH package using gnuradio fails with:
arm-linux-gnueabihf-g++: ERROR: unsafe header/library path used in cross-compilation: '-isystem' '/usr/include'

By simply providing 'include', produced .cmake contains:
INTERFACE_INCLUDE_DIRECTORIES "${_IMPORT_PREFIX}/include"
instead of
INTERFACE_INCLUDE_DIRECTORIES "/usr/include"

[Upstream status: gnuradio/gnuradio#3737]

Fix (many) gr-osmosdr build failure:
- http://autobuild.buildroot.net/results/66b76c07f15bb3e6db697c47796ae3dd15ecf4b9/

Signed-off-by: Gwenhael Goavec-Merou <gwenhael.goavec-merou@trabucayre.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/gnuradio/0003-gnuradio-runtime_pmt-dont-hardcode-INTERFACE_INCLUDE_DIRECTORIES.patch

@@ -0,0 +1,57 @@
+From 84dea8284c521f08508bb2dcbc99db3b5d3438fd Mon Sep 17 00:00:00 2001
+From: Gwenhael Goavec-Merou <gwenhael.goavec-merou@trabucayre.com>
+Date: Thu, 27 Aug 2020 17:32:09 +0200
+Subject: [PATCH] gnuradio-runtime_pmt: dont hardcode
+ INTERFACE_INCLUDE_DIRECTORIES
+
+gnuradio-runtimeTargets.cmake and gnuradio-pmtTargets.cmake are filled
+using CMAKE_INSTALL_PREFIX for INSTALL_INTERFACE.
+
+Since CMAKE_INSTALL_PREFIX, in buildroot, is set to /usr, these files contains
+path to host system.
+
+With BR2_COMPILER_PARANOID_UNSAFE_PATH package using gnuradio fails with:
+arm-linux-gnueabihf-g++: ERROR: unsafe header/library path used in cross-compilation: '-isystem' '/usr/include'
+
+By simply providing 'include', produced .cmake contains:
+INTERFACE_INCLUDE_DIRECTORIES "${_IMPORT_PREFIX}/include"
+instead of
+INTERFACE_INCLUDE_DIRECTORIES "/usr/include"
+
+[Upstream status: https://github.com/gnuradio/gnuradio/pull/3737]
+
+Signed-off-by: Gwenhael Goavec-Merou <gwenhael.goavec-merou@trabucayre.com>
+---
+ gnuradio-runtime/lib/CMakeLists.txt     | 2 +-
+ gnuradio-runtime/lib/pmt/CMakeLists.txt | 2 +-
+ 2 files changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/gnuradio-runtime/lib/CMakeLists.txt b/gnuradio-runtime/lib/CMakeLists.txt
+index 5aa90a5e1..fc32f473b 100644
+--- a/gnuradio-runtime/lib/CMakeLists.txt
++++ b/gnuradio-runtime/lib/CMakeLists.txt
+@@ -214,7 +214,7 @@ target_link_libraries(gnuradio-runtime PUBLIC
+
+ target_include_directories(gnuradio-runtime
+   PUBLIC
+-    $<INSTALL_INTERFACE:${CMAKE_INSTALL_PREFIX}/include>
++    $<INSTALL_INTERFACE:include>
+     $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/../include>
+     $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}/../include>
+   PRIVATE
+diff --git a/gnuradio-runtime/lib/pmt/CMakeLists.txt b/gnuradio-runtime/lib/pmt/CMakeLists.txt
+index 9fb98d0fc..6dfcd945c 100644
+--- a/gnuradio-runtime/lib/pmt/CMakeLists.txt
++++ b/gnuradio-runtime/lib/pmt/CMakeLists.txt
+@@ -33,7 +33,7 @@ target_link_libraries(gnuradio-pmt
+
+ target_include_directories(gnuradio-pmt
+   PUBLIC
+-  $<INSTALL_INTERFACE:${CMAKE_INSTALL_PREFIX}/include>
++  $<INSTALL_INTERFACE:include>
+   $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/../../include>
+   PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/
+   )
+-- 
+2.26.2
+