Tip: Set up the command shell or
window as described in Setting Up the Vitis Environment prior to
running the tools.
For embedded processor-based platforms, the host program (host.exe
), is cross-compiled and linked for an Arm processor using the GNU Arm cross-compiler version of g++
in
the following two step process:
Tip:
aarch64
is used for
Zynq®
UltraScale+™
(A53) and
Versal®
(A72) devices. aarch32
is used for Zynq-7000 SoC
(A9) and the tool chain is in a different location. - Compile the host.cpp into an
object file (.o):
$XILINX_VITIS/gnu/aarch64/lin/aarch64-linux/bin/aarch64-linux-gnu-g++ -c \ -D__USE_XOPEN2K8 -I$SYSROOT/usr/include/xrt -I$XILINX_VIVADO/include \ -I$SYSROOT/usr/include -fmessage-length=0 -std=c++14 --sysroot=$SYSROOT \ -o src/host.o ../src/host.cpp
- Link the object file with required libraries to build the executable
application.
$XILINX_VITIS/gnu/aarch64/lin/aarch64-linux/bin/aarch64-linux-gnu-g++ -l \ -lxrt_coreutil -lpthread -lrt -lstdc++ -lgmp -L$SYSROOT/usr/lib/ \ --sysroot=$SYSROOT -o host.exe src/host.o
When compiling the application for use with an embedded process, you must specify the sysroot for the application. The sysroot is part of the platform where the basic system root file structure is defined, and is installed as described in .
Important: The above examples
rely on the use of
$SYSROOT
environment variable that
must be used to specify the location of the sysroot for your embedded platform. The following are key elements to compiling the host code for an edge platform:
- Compilation
-
- -I$SYSROOT/usr/include
- -I$SYSROOT/usr/include/xrt
-
-std=c++14
: Define the C++ language standard. Compiling host code with XRT native C++ API requires C++ standard with-std=c++14
or newer. However, on GCC versions older than 4.9.0, use-std=c++1y
instead.
- Linking
-
- -L$SYSROOT/usr/lib: Library paths location.
-
-lxrt_coreutil
: Required library for use with the XRT native API. -
-pthread
: Required by XRT library for multithreading.
Building OpenCL API Host Code
The Vitis application
acceleration development flow also supports the use of OpenCL API to program your host application. Building OpenCL applications using
g++
uses the following command line:
g++ -g -std=c++1y -I$XILINX_XRT/include -L$XILINX_XRT/lib -o host.exe host.cpp \
-lOpenCL -pthread
The only difference is the use of the OpenCL
library for the OpenCL API
in place of the xrt_coreutil
library for the XRT
native API.
Note: In Vitis Accel_Examples you can see the addition of
xcl2.cpp source file, and the
-I../xcl2
include statement. These additions to the
host program and g++
command provide access to
helper utilities used by the example code, but are generally not required for your
own code.