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-rw-r--r--sysdeps/ieee754/float128/Makefile4
1 files changed, 4 insertions, 0 deletions
diff --git a/sysdeps/ieee754/float128/Makefile b/sysdeps/ieee754/float128/Makefile
index 166e630290..571a841809 100644
--- a/sysdeps/ieee754/float128/Makefile
+++ b/sysdeps/ieee754/float128/Makefile
@@ -1,6 +1,10 @@
 ifeq ($(subdir),stdlib)
 routines += float1282mpn strfromf128
 routines += strtof128 strtof128_l strtof128_nan mpn2float128
+
+# The strfrom class of functions call __printf_fp in order to convert the
+# floating-point value to characters.  This requires the value of IO_MTSAFE_IO.
+CFLAGS-strfromf128.c += $(libio-mtsafe)
 endif
 
 ifeq ($(subdir),wcsmbs)