CMake: split configuration in two files

The main CMakeLists.txt file in the project's root directory takes
care of the main project settings like project name and version,
handling the options, finding dependencies, etc.

The src/CMakeLists.txt handles options that are necessary to build
libavrdude library and avrdude binary.

.github/workflows/build.yml

@@ -29,9 +29,6 @@ env:
 jobs:
   linux-x86_64:
     runs-on: ubuntu-latest
-    defaults:
-      run:
-        working-directory: ./src
     steps:
       - uses: actions/checkout@v2
       - name: Install prerequisites
@@ -53,9 +50,9 @@ jobs:
           -D HAVE_LINUXGPIO=1
           -D HAVE_LINUXSPI=1
           -D CMAKE_BUILD_TYPE=${{env.BUILD_TYPE}}
-          -B ../build
+          -B build
       - name: Build
-        run: cmake --build ../build
+        run: cmake --build build
       - name: Archive build artifacts
         if: always()
         uses: actions/upload-artifact@v2
@@ -70,15 +67,12 @@ jobs:
         with:
           name: avrdude-linux-x86_64
           path: |
-            build/avrdude
-            build/avrdude.conf
+            build/src/avrdude
+            build/src/avrdude.conf
 
   linux:
     runs-on: ubuntu-latest
     container: debian:11
-    defaults:
-      run:
-        working-directory: ./src
     strategy:
       matrix:
         include:
@@ -117,9 +111,9 @@ jobs:
           -D CMAKE_FIND_ROOT_PATH=/usr/${{matrix.prefix}}
           -D CMAKE_INCLUDE_PATH=/usr/include/${{matrix.inc-lib}}
           -D CMAKE_LIBRARY_PATH=/usr/lib/${{matrix.inc-lib}}
-          -B ../build
+          -B build
       - name: Build
-        run: cmake --build ../build
+        run: cmake --build build
       - name: Archive build artifacts
         if: always()
         uses: actions/upload-artifact@v2
@@ -134,14 +128,11 @@ jobs:
         with:
           name: avrdude-linux-${{matrix.processor}}
           path: |
-            build/avrdude
-            build/avrdude.conf
+            build/src/avrdude
+            build/src/avrdude.conf
 
   macos-x86_64:
     runs-on: macos-latest
-    defaults:
-      run:
-        working-directory: ./src
     steps:
       - uses: actions/checkout@v2
       - name: Install prerequisites
@@ -161,9 +152,9 @@ jobs:
           -D CMAKE_EXE_LINKER_FLAGS=-L/usr/local/Cellar
           -D DEBUG_CMAKE=1
           -D CMAKE_BUILD_TYPE=${{env.BUILD_TYPE}}
-          -B ../build
+          -B build
       - name: Build
-        run: cmake --build ../build
+        run: cmake --build build
       - name: Archive build artifacts
         if: always()
         uses: actions/upload-artifact@v2
@@ -178,14 +169,11 @@ jobs:
         with:
           name: avrdude-macos-x86_64
           path: |
-            build/avrdude
-            build/avrdude.conf
+            build/src/avrdude
+            build/src/avrdude.conf
 
   msvc:
     runs-on: windows-latest
-    defaults:
-      run:
-        working-directory: ./src
     strategy:
       matrix:
         include:
@@ -212,9 +200,9 @@ jobs:
           -D CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO="/DEBUG /INCREMENTAL:NO /LTCG /OPT:REF /OPT:ICF"
           -D CMAKE_BUILD_TYPE=${{env.BUILD_TYPE}}
           -D USE_EXTERNAL=1
-          -B ../build
+          -B build
       - name: Build
-        run: cmake --build ../build --config ${{env.BUILD_TYPE}}
+        run: cmake --build build --config ${{env.BUILD_TYPE}}
       - name: Archive build artifacts
         if: always()
         uses: actions/upload-artifact@v2
@@ -226,23 +214,22 @@ jobs:
             !**/*.obj
       - name: Move executables
         run: |
-          mv ../build/RelWithDebInfo/avrdude.exe ../build
-          mv ../build/RelWithDebInfo/avrdude.pdb ../build
+          mv build/src/RelWithDebInfo/avrdude.exe build/src
+          mv build/src/RelWithDebInfo/avrdude.pdb build/src
       - name: Archive executables
         uses: actions/upload-artifact@v2
         with:
           name: avrdude-msvc-${{matrix.arch}}
           path: |
-            build/avrdude.exe
-            build/avrdude.pdb
-            build/avrdude.conf
+            build/src/avrdude.exe
+            build/src/avrdude.pdb
+            build/src/avrdude.conf
 
   mingw:
     runs-on: windows-latest
     defaults:
       run:
         shell: msys2 {0}
-        working-directory: ./src
     strategy:
       matrix:
         include:
@@ -269,9 +256,9 @@ jobs:
           -G"MSYS Makefiles"
           -D DEBUG_CMAKE=1
           -D CMAKE_BUILD_TYPE=${{env.BUILD_TYPE}}
-          -B ../build
+          -B build
       - name: Build
-        run: cmake --build ../build
+        run: cmake --build build
       - name: Archive build artifacts
         if: always()
         uses: actions/upload-artifact@v2
@@ -284,5 +271,5 @@ jobs:
         with:
           name: avrdude-mingw-${{matrix.env}}
           path: |
-            build/avrdude.exe
-            build/avrdude.conf
+            build/src/avrdude.exe
+            build/src/avrdude.conf