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-rw-r--r--benchtests/Makefile3
1 files changed, 3 insertions, 0 deletions
diff --git a/benchtests/Makefile b/benchtests/Makefile
index b184461ffd..ca635cfe85 100644
--- a/benchtests/Makefile
+++ b/benchtests/Makefile
@@ -37,6 +37,9 @@ stdlib-bench := strtod
 
 benchset := $(string-bench-all) $(stdlib-bench)
 
+CFLAGS-bench-ffs.c += -fno-builtin
+CFLAGS-bench-ffsll.c += -fno-builtin
+
 LDLIBS-bench-acos = -lm
 LDLIBS-bench-acosh = -lm
 LDLIBS-bench-asin = -lm