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-rw-r--r--mk/warnings.mk4
1 files changed, 3 insertions, 1 deletions
diff --git a/mk/warnings.mk b/mk/warnings.mk
index 9426db2a1d..0ae81bfcac 100644
--- a/mk/warnings.mk
+++ b/mk/warnings.mk
@@ -20,11 +20,13 @@ GhcStage2HcOpts += -Wcpp-undef
ifneq "$(GccIsClang)" "YES"
# Debian doesn't turn -Werror=unused-but-set-variable on by default, so
-# we turn it on explicitly for consistency with other users.
+# we turn it on explicitly for consistency with other users
+ifeq "$(GccLT46)" "NO"
# Never set the flag on Windows as the host gcc may be too old.
ifneq "$(HostOS_CPP)" "mingw32"
SRC_CC_WARNING_OPTS += -Werror=unused-but-set-variable
endif
+endif
# Suppress the warning about __sync_fetch_and_nand (#9678).
libraries/ghc-prim/cbits/atomic_CC_OPTS += -Wno-sync-nand