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+synopsis: Support per-component builds when coverage is enabled
+packages: Cabal cabal-install
+prs: #9464
+issues: #4798 #5213 #6440 #6397
+significance: significant
+
+description: {
+
+Cabal now supports per-component builds when coverage is enabled.  This enables
+coverage for packages with internal libraries (#6440), and enables coverage for
+packages that use backpack (#6397), even though we do not get coverage for
+instantiations of an indefinite module (it is not clear what it means for HPC
+to support backpack, regardless of Cabal).
+
+To achieve this, hpc information (`.mix` files) from a library is now written
+into the package database of a library under `extraCompilationArtifacts`.
+
+Cabal configure (via the Setup interface) now accepts --coverage-for=<unit-id>,
+a flag which specifies which libraries should be included in the coverage
+report for some testsuite.
+
+}