Extend the .mix path hack to -O0 and -O2

Author: Mikolaj

Cabal/src/Distribution/Simple/Hpc.hs

@@ -77,10 +77,19 @@ mixDir distPref way name = hpcDir distPrefBuild way </> "mix" </> name
   -- @./dist-newstyle/build/x86_64-linux/ghc-9.0.1/cabal-gh5213-0.1/t/tests@
   -- but the path where library mix files reside has two less components
   -- at the end (@t/tests@) and this reduced path needs to be passed to
-  -- both @hpc@ and @ghc@.
+  -- both @hpc@ and @ghc@. For non-default optimization levels, the path
+  -- suffix is one element longer and the extra path element needs
+  -- to be preserved.
   distPrefElements = splitDirectories distPref
-  distPrefBuild = case drop (length distPrefElements - 2) distPrefElements of
-    "t" : _ -> joinPath $ take (length distPrefElements - 2) distPrefElements
+  distPrefBuild = case drop (length distPrefElements - 3) distPrefElements of
+    ["t", _, "noopt"] ->
+      joinPath $ take (length distPrefElements - 3) distPrefElements
+                 ++ ["noopt"]
+    ["t", _, "opt"] ->
+      joinPath $ take (length distPrefElements - 3) distPrefElements
+                 ++ ["opt"]
+    [_, "t", _] ->
+      joinPath $ take (length distPrefElements - 2) distPrefElements
     _ -> distPref
 
 tixDir :: FilePath  -- ^ \"dist/\" prefix

cabal-testsuite/PackageTests/Regression/T5213ExeCoverage/cabal.out

@@ -14,7 +14,7 @@ Building test suite 'tests' for cabal-gh5213-0.1..
 Running 1 test suites...
 Test suite tests: RUNNING...
 Test suite tests: PASS
-Test suite logged to: <ROOT>/cabal.dist/work/./dist/build/<ARCH>/ghc-<GHCVER>/cabal-gh5213-0.1/t/tests/test/cabal-gh5213-0.1-tests.log
-Test coverage report written to <ROOT>/cabal.dist/work/./dist/build/<ARCH>/ghc-<GHCVER>/cabal-gh5213-0.1/t/tests/hpc/vanilla/html/tests/hpc_index.html
+Test suite logged to: <ROOT>/cabal.dist/work/./dist/build/<ARCH>/ghc-<GHCVER>/cabal-gh5213-0.1/t/tests/noopt/test/cabal-gh5213-0.1-tests.log
+Test coverage report written to <ROOT>/cabal.dist/work/./dist/build/<ARCH>/ghc-<GHCVER>/cabal-gh5213-0.1/t/tests/noopt/hpc/vanilla/html/tests/hpc_index.html
 1 of 1 test suites (1 of 1 test cases) passed.
-Package coverage report written to <ROOT>/cabal.dist/work/./dist/build/<ARCH>/ghc-<GHCVER>/cabal-gh5213-0.1/t/tests/hpc/vanilla/html/cabal-gh5213-0.1/hpc_index.html
+Package coverage report written to <ROOT>/cabal.dist/work/./dist/build/<ARCH>/ghc-<GHCVER>/cabal-gh5213-0.1/t/tests/noopt/hpc/vanilla/html/cabal-gh5213-0.1/hpc_index.html