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Slightly modified version of
https://gitlab.haskell.org/ghc/ghc/-/issues/19029#note_447989, required
for older, buggy glibc versions < 2.34.
diff -Naur ghc-9.2.5/compiler/GHC/Linker/Unit.hs ghc-9.2.5.patched/compiler/GHC/Linker/Unit.hs
--- ghc-9.2.5/compiler/GHC/Linker/Unit.hs 2022-11-06 20:40:29.000000000 +0100
+++ ghc-9.2.5.patched/compiler/GHC/Linker/Unit.hs 2023-01-15 14:52:57.511275338 +0100
@@ -31,11 +31,26 @@
ps <- mayThrowUnitErr $ preloadUnitsInfo' unit_env pkgs
return (collectLinkOpts dflags ps)
+fixOrderLinkOpts :: [String] -> [String]
+fixOrderLinkOpts opts
+ | have_bad_glibc_version -- glibc version strictly less than 2.34
+ , let (before, rest) = break (== libc) opts
+ , not (pthread `elem` before)
+ , pthread `elem` rest -- optional if we know pthread is definitely present
+ = before ++ pthread_and_deps ++ rest
+ | otherwise
+ = opts
+ where
+ pthread = "-lpthread"
+ libc = "-lc"
+ pthread_and_deps = [ "-lrt", pthread ] -- should depend on the environment
+ have_bad_glibc_version = True
+
collectLinkOpts :: DynFlags -> [UnitInfo] -> ([String], [String], [String])
collectLinkOpts dflags ps =
(
concatMap (map ("-l" ++) . unitHsLibs (ghcNameVersion dflags) (ways dflags)) ps,
- concatMap (map ("-l" ++) . map ST.unpack . unitExtDepLibsSys) ps,
+ fixOrderLinkOpts $ concatMap (map ("-l" ++) . map ST.unpack . unitExtDepLibsSys) ps,
concatMap (map ST.unpack . unitLinkerOptions) ps
)
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