From dd3952923a2cfb9fa2276a4f1f6512ff75e1a155 Mon Sep 17 00:00:00 2001
From: Damjan Marion <damarion@cisco.com>
Date: Tue, 15 Jan 2019 00:36:03 +0100
Subject: [PATCH] cmake: initial cross-compilation support

Change-Id: Ib9c2aba1eda08a22465441e33553b9b744c79d56
Signed-off-by: Damjan Marion <damarion@cisco.com>
---
 src/CMakeLists.txt                | 11 +++++++++++
 src/cmake/cpu.cmake               |  5 ++++-
 src/plugins/dpdk/CMakeLists.txt   |  5 +++++
 src/vpp-api/python/CMakeLists.txt |  1 -
 4 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index fedf931f041..b404b5069b4 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -32,6 +32,16 @@ execute_process(
 string(REPLACE "-" ";" VPP_LIB_VERSION ${VPP_VERSION})
 list(GET VPP_LIB_VERSION 0 VPP_LIB_VERSION)
 
+##############################################################################
+# cross compiling
+##############################################################################
+if(CMAKE_CROSSCOMPILING)
+  set(CMAKE_IGNORE_PATH
+    /usr/lib/${CMAKE_HOST_SYSTEM_PROCESSOR}-linux-gnu/
+    /usr/lib/${CMAKE_HOST_SYSTEM_PROCESSOR}-linux-gnu/lib/
+  )
+endif()
+
 ##############################################################################
 # build config
 ##############################################################################
@@ -123,6 +133,7 @@ pr("VPP library version" "${VPP_LIB_VERSION}")
 pr("GIT toplevel dir" "${VPP_GIT_TOPLEVEL_DIR}")
 pr("C flags" "${CMAKE_C_FLAGS}")
 pr("Linker flags" "${CMAKE_LINKER_FLAGS}")
+pr("Host processor" "${CMAKE_HOST_SYSTEM_PROCESSOR}")
 pr("Target processor" "${CMAKE_SYSTEM_PROCESSOR}")
 pr("Build type" "${CMAKE_BUILD_TYPE}")
 pr("Prefix path" "${CMAKE_PREFIX_PATH}")
diff --git a/src/cmake/cpu.cmake b/src/cmake/cpu.cmake
index 20dab7bfce1..b2af1aa0926 100644
--- a/src/cmake/cpu.cmake
+++ b/src/cmake/cpu.cmake
@@ -14,7 +14,10 @@
 ##############################################################################
 # Cache line size detection
 ##############################################################################
-if(CMAKE_SYSTEM_PROCESSOR MATCHES "^(aarch64.*|AARCH64.*)")
+if(CMAKE_CROSSCOMPILING)
+  message(STATUS "Cross-compiling - cache line size detection disabled")
+  set(VPP_LOG2_CACHE_LINE_SIZE 6)
+elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(aarch64.*|AARCH64.*)")
   file(READ "/proc/cpuinfo" cpuinfo)
   string(REPLACE "\n" ";" cpuinfo ${cpuinfo})
   foreach(l ${cpuinfo})
diff --git a/src/plugins/dpdk/CMakeLists.txt b/src/plugins/dpdk/CMakeLists.txt
index 45605baada0..36a369c0a7b 100644
--- a/src/plugins/dpdk/CMakeLists.txt
+++ b/src/plugins/dpdk/CMakeLists.txt
@@ -11,6 +11,11 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+if (CMAKE_CROSSCOMPILING)
+  # not supported yet
+  return()
+endif()
+
 ##############################################################################
 # Find lib and include files
 ##############################################################################
diff --git a/src/vpp-api/python/CMakeLists.txt b/src/vpp-api/python/CMakeLists.txt
index 52215ccafec..a81a6f66f63 100644
--- a/src/vpp-api/python/CMakeLists.txt
+++ b/src/vpp-api/python/CMakeLists.txt
@@ -12,7 +12,6 @@
 # limitations under the License.
 
 find_package(PythonInterp 2.7)
-find_package(PythonLibs 2.7)
 
 if(PYTHONINTERP_FOUND)
   install(
-- 
2.16.6