From 1c35fe3d31710e609477423f69bfb1403558667d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Micha=C5=82=20K=C5=82eczek?= <michal@kleczek.org>
Date: Mon, 15 Jun 2026 17:26:07 +0200
Subject: [PATCH] perf: add ghc 9.12 options -fexpose-overloaded-unfoldings
 -fspecialise-aggressively

Before 9.12.1 it was necessary to mark functions as INLINABLE or INLINE to make GHC consider cross-module specialization of polymorphic functions.
9.12 added a new -fexpose-overloaded-unfoldings flag that exposes optimized polymorphic functions in interface files. -fspecialise-aggressively then makes GHC apply aggresive specialization.
---
 postgrest.cabal | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/postgrest.cabal b/postgrest.cabal
index 04a4e324be..f77507272c 100644
--- a/postgrest.cabal
+++ b/postgrest.cabal
@@ -177,7 +177,9 @@ library
     if flag(hpc)
       ghc-options: -fhpc -hpcdir .hpc
   else
-    ghc-options: -O2
+    ghc-options: -O2  
+    if impl(ghc >= 9.12)
+      ghc-options: -fexpose-overloaded-unfoldings -fspecialise-aggressively
 
   if !os(windows)
     build-depends: