try fix cmake build 3

.github/workflows/cmake.yml

@@ -3,15 +3,12 @@ name: CMake
 on: [push]
 
 env:
-  # Customize the CMake build type here (Release, Debug, RelWithDebInfo, etc.)
   BUILD_TYPE: Release
+  BUILD_PATH: $GITHUB_WORKSPACE/build
+  SRC_PATH: $BUILD_PATH/src
 
 jobs:
   build:
-    # The CMake configure and build commands are platform agnostic and should work equally
-    # well on Windows or Mac.  You can convert this to a matrix build if you need
-    # cross-platform coverage.
-    # See: https://docs.github.com/en/free-pro-team@latest/actions/learn-github-actions/managing-complex-workflows#using-a-build-matrix
     runs-on: ubuntu-20.04
 
     steps:
@@ -27,31 +24,20 @@ jobs:
       run: echo "tag is $GIT_TAG_NAME"
 
     - name: Create Build Environment
-      # Some projects don't allow in-source building, so create a separate build directory
-      # We'll use this as our working directory for all subsequent commands
-      run: cmake -E make_directory ${{github.workspace}}/build/src
+      run: cmake -E make_directory $BUILD_PATH
 
     - name: Configure CMake
-      # Use a bash shell so we can use the same syntax for environment variable
-      # access regardless of the host operating system
       shell: bash
-      working-directory: ${{github.workspace}}/build/src
-      # Note the current convention is to use the -S and -B options here to specify source 
-      # and build directories, but this is only available with CMake 3.13 and higher.  
-      # The CMake binaries on the Github Actions machines are (as of this writing) 3.12
-      run: cmake $GITHUB_WORKSPACE -DCMAKE_BUILD_TYPE=$BUILD_TYPE
+      run: cmake -S $SRC_PATH -B $BUILD_PATH -DCMAKE_BUILD_TYPE=$BUILD_TYPE
 
     - name: Build
-      working-directory: ${{github.workspace}}/build/src
+      working-directory: $SRC_PATH
       shell: bash
-      # Execute the build.  You can specify a specific target with "--target <NAME>"
       run: cmake --build . --config $BUILD_TYPE
 
     - name: Test
-      working-directory: ${{github.workspace}}/build/src
+      working-directory: $SRC_PATH
       shell: bash
-      # Execute tests defined by the CMake configuration.  
-      # See https://cmake.org/cmake/help/latest/manual/ctest.1.html for more detail
       run: ctest -C $BUILD_TYPE
 
     - name: Upload release artifacts