From 4255f1af06f432d56c48f8de2b2cf70d3345d18c Mon Sep 17 00:00:00 2001
From: Julian Ospald <hasufell@posteo.de>
Date: Tue, 24 Aug 2021 16:03:37 +0200
Subject: [PATCH] Pass 'with-gcc:' specified compiler to 'stack setup', fixes
 #5493

---
 src/Stack/Setup.hs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/Stack/Setup.hs b/src/Stack/Setup.hs
index c728879cb3..77d35f07ee 100644
--- a/src/Stack/Setup.hs
+++ b/src/Stack/Setup.hs
@@ -1405,9 +1405,10 @@ installGHCPosix downloadInfo _ archiveFile archiveType tempDir destDir = do
 
     dir <- expectSingleUnpackedDir archiveFile tempDir
 
+    gccEnvMaybe <- fmap (\gcc -> Map.fromList [("CC", T.pack (toFilePath gcc))]) <$> (view $ configL.to configOverrideGccPath)
     logSticky "Configuring GHC ..."
     runStep "configuring" dir
-        (gdiConfigureEnv downloadInfo)
+        (fromMaybe Map.empty gccEnvMaybe `Map.union` gdiConfigureEnv downloadInfo)
         (toFilePath $ dir </> relFileConfigure)
         (("--prefix=" ++ toFilePath destDir) : map T.unpack (gdiConfigureOpts downloadInfo))