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-rw-r--r--hadrian/cabal.project6
1 files changed, 6 insertions, 0 deletions
diff --git a/hadrian/cabal.project b/hadrian/cabal.project
index 176d1eef94..d9c329141f 100644
--- a/hadrian/cabal.project
+++ b/hadrian/cabal.project
@@ -1,2 +1,8 @@
packages: ./
../libraries/Cabal/Cabal/
+
+# N.B. Compile with -O0 since this is not a performance-critical executable
+# and the Cabal takes nearly twice as long to build with -O1. See #16817.
+package Cabal
+ optimization: False
+