ci: enable coverage in github actions

.github/workflows/ci.yml

@@ -27,7 +27,10 @@ jobs:
     - name: build (LLVM ${{ matrix.llvm_version }})
       # Run the build manually in `nix develop` to keep non-outputs around
       run: |
-        nix develop .#oid-llvm${{ matrix.llvm_version }} --command cmake -B build -G Ninja -DWITH_FLAKY_TESTS=Off -DFORCE_BOOST_STATIC=Off
+        nix develop .#oid-llvm${{ matrix.llvm_version }} --command cmake -B build -G Ninja \
+          -DWITH_FLAKY_TESTS=Off \
+          -DFORCE_BOOST_STATIC=Off \
+          -DCODE_COVERAGE=On
         nix develop .#oid-llvm${{ matrix.llvm_version }} --command ninja -C build
     - name: test (LLVM ${{ matrix.llvm_version }})
       env:
@@ -46,9 +49,29 @@ jobs:
           --repeat until-pass:3 \
           --exclude-from-file ../../.github/workflows/tests_failing_under_nix.txt \
           --output-junit results.xml
+
+    - name: upload coverage
+      continue-on-error: true
+      uses: coverallsapp/github-action@v2
+      with:
+        flag-name: run-${{ join(matrix.*, '-') }}
+        parallel: true
+
     - name: upload results
       uses: actions/upload-artifact@v4
       if: success() || failure()
       with:
         name: test-results-${{ matrix.llvm_version }}
         path: build/test/results.xml
+
+  finalise-coverage:
+    needs: build-test
+    if: ${{ always() }}
+    runs-on: ubuntu-latest
+    steps:
+    - name: finalise coverage
+      uses: coverallsapp/github-action@v2
+      with:
+        parallel-finished: true
+        carryforward: "run-15,run-16"
+

flake.nix

@@ -21,6 +21,7 @@
     flake-utils.lib.eachSystem [ flake-utils.lib.system.x86_64-linux ] (
       system:
       let
+        defaultLlvmVersion = 16;
         pkgs = import nixpkgs { inherit system; };
 
         drgnSrc = pkgs.fetchFromGitHub {
@@ -32,14 +33,16 @@
         };
 
         mkOidPackage =
-          llvmPackages:
-          with pkgs;
+          llvmVersion:
+          let
+            llvmPackages = pkgs."llvmPackages_${toString llvmVersion}";
+          in
           llvmPackages.stdenv.mkDerivation rec {
             name = "oid";
 
             src = self;
 
-            nativeBuildInputs = [
+            nativeBuildInputs = with pkgs; [
               autoconf
               automake
               bison
@@ -57,36 +60,38 @@
               glibcLocales
             ];
 
-            buildInputs = [
-              llvmPackages.libclang
-              llvmPackages.llvm
-              llvmPackages.openmp
-
-              boost
-              bzip2
-              curl
-              double-conversion
-              elfutils
-              flex
-              folly
-              folly.fmt
-              gflags
-              glog
-              gtest
-              icu
-              jemalloc
-              libarchive
-              libmicrohttpd
-              liburing
-              libxml2
-              lzma
-              msgpack
-              range-v3
-              rocksdb_8_11
-              sqlite
-              tomlplusplus
-              zstd
-            ];
+            buildInputs =
+              (with llvmPackages; [
+                llvmPackages.libclang
+                llvmPackages.llvm
+                llvmPackages.openmp
+              ])
+              ++ (with pkgs; [
+                boost
+                bzip2
+                curl
+                double-conversion
+                elfutils
+                flex
+                folly
+                folly.fmt
+                gflags
+                glog
+                gtest
+                icu
+                jemalloc
+                libarchive
+                libmicrohttpd
+                liburing
+                libxml2
+                lzma
+                msgpack
+                range-v3
+                rocksdb_8_11
+                sqlite
+                tomlplusplus
+                zstd
+              ]);
 
             cmakeFlags = [
               "-Ddrgn_SOURCE_DIR=${drgnSrc}"
@@ -95,13 +100,29 @@
 
             outputs = [ "out" ];
           };
+
+        mkOidDevShell =
+          llvmVersion:
+          let
+            llvmPackages = pkgs."llvmPackages_${toString llvmVersion}";
+          in
+          pkgs.mkShell.override { stdenv = llvmPackages.stdenv; } {
+            inputsFrom = [ self.packages.${system}."oid-llvm${toString llvmVersion}" ];
+            buildInputs = with pkgs; [ lcov ];
+          };
       in
       {
         packages = rec {
-          default = oid-llvm16;
+          default = self.packages.${system}."oid-llvm${toString defaultLlvmVersion}";
+
+          oid-llvm15 = mkOidPackage 15;
+          oid-llvm16 = mkOidPackage 16;
+        };
+        devShells = rec {
+          default = self.devShells.${system}."oid-llvm${toString defaultLlvmVersion}";
 
-          oid-llvm15 = mkOidPackage pkgs.llvmPackages_15;
-          oid-llvm16 = mkOidPackage pkgs.llvmPackages_16;
+          oid-llvm15 = mkOidDevShell 15;
+          oid-llvm16 = mkOidDevShell 16;
         };
 
         apps.default = {