summaryrefslogtreecommitdiff
path: root/mk/warnings.mk
diff options
context:
space:
mode:
Diffstat (limited to 'mk/warnings.mk')
-rw-r--r--mk/warnings.mk4
1 files changed, 2 insertions, 2 deletions
diff --git a/mk/warnings.mk b/mk/warnings.mk
index 5ca097f17b..3c4c26d218 100644
--- a/mk/warnings.mk
+++ b/mk/warnings.mk
@@ -8,8 +8,8 @@ SRC_HC_OPTS += -Wall
# isn't supported yet (https://ghc.haskell.org/trac/ghc/wiki/Design/Warnings).
#
# See Note [Stage number in build variables] in mk/config.mk.in.
-SRC_HC_OPTS_STAGE1 += $(WERROR)
-SRC_HC_OPTS_STAGE2 += $(WERROR)
+SRC_HC_OPTS_STAGE1 += $(WERROR) -Wcpp-undef
+SRC_HC_OPTS_STAGE2 += $(WERROR) -Wcpp-undef
ifneq "$(GccIsClang)" "YES"