Adds toolchain file for Raspberry Pi 5

Signed-off-by: tinyboxvk <13696594+tinyboxvk@users.noreply.github.com>

README.md

@@ -74,12 +74,13 @@ To build for these boards you need specify the correct cmake toolchain file for
 
 _Note: There is no need for adding extra options to the compiler for 64 bit._
 
+* Raspberry Pi 5 `arm_cortex_a76_hardfp_native.cmake`
 * Raspberry Pi 4 `arm_cortex_a72_hardfp_native.cmake`
 * Raspberry Pi 3 `arm_cortex_a53_hardfp_native.cmake`
 
 ```bash
 $ mkdir build && cd build
-$ cmake -DCMAKE_TOOLCHAIN_FILE=../cmake/Toolchains/arm_cortex_a72_hardfp_native.cmake ..
+$ cmake -DCMAKE_TOOLCHAIN_FILE=../cmake/Toolchains/arm_cortex_a76_hardfp_native.cmake ..
 # make -j4 might be faster
 $ make
 $ make test
@@ -136,4 +137,4 @@ notices at the top of source files list which years changes have been
 made. For some files, changes have occurred in many consecutive years.
 These files may often have the format of a year range (e.g., "2006 - 2011"),
 which indicates that these files have had copyrightable changes made
-during each year in the range, inclusive.
+during each year in the range, inclusive.

cmake/Toolchains/arm_cortex_a76_hardfp_native.cmake

@@ -0,0 +1,21 @@
+#
+# This file is part of VOLK
+#
+# SPDX-License-Identifier: LGPL-3.0-or-later
+#
+
+########################################################################
+# Toolchain file for building native on a ARM Cortex A76 w/ NEON
+# Usage: cmake -DCMAKE_TOOLCHAIN_FILE=<this file> <source directory>
+########################################################################
+set(CMAKE_CXX_COMPILER g++)
+set(CMAKE_C_COMPILER gcc)
+set(CMAKE_CXX_FLAGS
+    "-march=armv8.2-a -mtune=cortex-a76 -mfpu=neon-fp-armv8 -mfloat-abi=hard"
+    CACHE STRING "" FORCE)
+set(CMAKE_C_FLAGS
+    ${CMAKE_CXX_FLAGS}
+    CACHE STRING "" FORCE) #same flags for C sources
+set(CMAKE_ASM_FLAGS
+    "${CMAKE_CXX_FLAGS} -mthumb -g"
+    CACHE STRING "" FORCE) #same flags for asm sources