ci: Collect coverage data for MINGW_64 builds on appveyor

appveyor.yml

@@ -2,6 +2,14 @@ version: '{build}'
 configuration:
 - MINGW_64
 - MINGW_32
+environment:
+  matrix:
+    - USE_GCOV: ON
+    - USE_GCOV: OFF
+matrix:
+  exclude:
+    - configuration: MINGW_32
+      USE_GCOV: ON
 install: []
 build_script:
 - call ci\build.bat

ci/build.bat

@@ -38,13 +38,17 @@ cd ..
 :: Build Neovim
 mkdir build
 cd build
-cmake -G "MinGW Makefiles" -DCMAKE_BUILD_TYPE=RelWithDebInfo -DBUSTED_OUTPUT_TYPE=nvim -DGPERF_PRG="C:\msys64\usr\bin\gperf.exe" .. || goto :error
+cmake -G "MinGW Makefiles" -DCMAKE_BUILD_TYPE=RelWithDebInfo -DBUSTED_OUTPUT_TYPE=nvim -DUSE_GCOV="%USE_GCOV%" -DGPERF_PRG="C:\msys64\usr\bin\gperf.exe" .. || goto :error
 mingw32-make VERBOSE=1 || goto :error
 bin\nvim --version || goto :error
 
 :: Functional tests
 mingw32-make functionaltest VERBOSE=1 || goto :error
 
+if "%USE_GCOV%" == "ON" (
+  C:\msys64\usr\bin\bash -lc "cd /c/projects/neovim; bash <(curl -s https://codecov.io/bash) || echo 'codecov upload failed.'"
+)
+
 :: Build artifacts
 cpack -G ZIP -C RelWithDebInfo
 if defined APPVEYOR_REPO_TAG_NAME cpack -G NSIS -C RelWithDebInfo