build for 2k0300 fengniao (#149)

Author: nihui

.github/workflows/release.yml

@@ -1826,6 +1826,16 @@ jobs:
               export PATH=$PATH:$GITHUB_WORKSPACE/toolchain/gcc-linaro-7.2.1-2017.11-x86_64_arm-linux-gnueabi/bin
             cmake-options: -DWITH_AW=ON
 
+          - name: 2k0300-fengniao
+            single-core: true
+            cmake-toolchain: loongarch64-linux-gnu.toolchain.cmake
+            setup-toolchain-cmd: |
+              wget -q http://ftp.loongnix.cn/toolchain/gcc/release/loongarch/gcc8/loongson-gnu-toolchain-8.3-x86_64-loongarch64-linux-gnu-rc1.5.tar.xz
+              tar -xf loongson-gnu-toolchain-8.3-x86_64-loongarch64-linux-gnu-rc1.5.tar.xz
+            setup-env-cmd: |
+              export LOONGARCH64_ROOT_PATH=$GITHUB_WORKSPACE/loongson-gnu-toolchain-8.3-x86_64-loongarch64-linux-gnu-rc1.5
+            cmake-options: -DCPU_BASELINE='' -DCPU_DISPATCH=''
+
     env:
       COMMON_CMAKE_OPTIONS: |
         -DCMAKE_TOOLCHAIN_FILE=../../toolchains/${{ matrix.cmake-toolchain }} \

README.md

@@ -399,6 +399,14 @@ https://github.com/nihui/opencv-mobile/releases/latest
   </a>
 </td>
 <td>
+  <a href="https://www.loongson.cn/news/show?id=673">
+    <img alt="2k0300-fengniao" src="https://github.com/user-attachments/assets/3ff9048d-a2b7-46a4-8534-e8bf5b85a2e1" width="auto" height="120">
+    <br /><b>2k0300-fengniao</b>
+  </a>
+  <br />loongarch64-linux-gnu<br />
+  <a href="https://github.com/nihui/opencv-mobile/releases/latest/download/opencv-mobile-4.10.0-2k0300-fengniao.zip">
+    <img alt="opencv4-2k0300-fengniao" src="https://img.shields.io/badge/download-4.10.0-blue?style=for-the-badge">
+  </a>
 </td>
 </tr>
 

toolchains/loongarch64-linux-gnu.toolchain.cmake

@@ -0,0 +1,27 @@
+set(CMAKE_SYSTEM_NAME Linux)
+set(CMAKE_SYSTEM_PROCESSOR loongarch64)
+
+if(DEFINED ENV{LOONGARCH64_ROOT_PATH})
+    file(TO_CMAKE_PATH $ENV{LOONGARCH64_ROOT_PATH} LOONGARCH64_ROOT_PATH)
+else()
+    message(FATAL_ERROR "LOONGARCH64_ROOT_PATH env must be defined")
+endif()
+
+set(LOONGARCH64_ROOT_PATH ${LOONGARCH64_ROOT_PATH} CACHE STRING "root path to loongarch64 toolchain")
+
+set(CMAKE_C_COMPILER "${LOONGARCH64_ROOT_PATH}/bin/loongarch64-linux-gnu-gcc")
+set(CMAKE_CXX_COMPILER "${LOONGARCH64_ROOT_PATH}/bin/loongarch64-linux-gnu-g++")
+
+set(CMAKE_FIND_ROOT_PATH "${LOONGARCH64_ROOT_PATH}/loongarch64-linux-gnu")
+
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+
+set(CMAKE_C_FLAGS "-march=loongarch64")
+set(CMAKE_CXX_FLAGS "-march=loongarch64")
+
+# cache flags
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS}" CACHE STRING "c flags")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}" CACHE STRING "c++ flags")