Do not warn on -O2 if flag conditional

E.g. haskell#7423
ffaf1 · Aug 23, 2022 · a40cdf6 · a40cdf6
1 parent 7b07857
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diff --git a/cabal-testsuite/PackageTests/Check/ConfiguredPackage/GHCOptions/NoWarnFlag/cabal.out b/cabal-testsuite/PackageTests/Check/ConfiguredPackage/GHCOptions/NoWarnFlag/cabal.out
@@ -0,0 +1,2 @@
+# cabal check
+No errors or warnings could be found in the package.
diff --git a/cabal-testsuite/PackageTests/Check/ConfiguredPackage/GHCOptions/NoWarnFlag/cabal.test.hs b/cabal-testsuite/PackageTests/Check/ConfiguredPackage/GHCOptions/NoWarnFlag/cabal.test.hs
@@ -0,0 +1,4 @@
+import Test.Cabal.Prelude
+
+-- Do not output warning when an -O2 is behind a cabal flag.
+main = cabalTest $ cabal "check" []
diff --git a/cabal-testsuite/PackageTests/Check/ConfiguredPackage/GHCOptions/NoWarnFlag/pkg.cabal b/cabal-testsuite/PackageTests/Check/ConfiguredPackage/GHCOptions/NoWarnFlag/pkg.cabal
@@ -0,0 +1,18 @@
+cabal-version: 2.2
+name: pkg
+version: 0
+category: example
+maintainer: none@example.com
+synopsis: synopsys
+description: description
+license: GPL-3.0-or-later
+
+flag force-O2
+  default: False
+  manual: True
+
+library
+  exposed-modules:      Foo
+  default-language:     Haskell2010
+  if flag(force-O2)
+    ghc-options:        -O2
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		@@ -0,0 +1,2 @@
		# cabal check
		No errors or warnings could be found in the package.