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-rw-r--r--stdlib/Makefile6
1 files changed, 2 insertions, 4 deletions
diff --git a/stdlib/Makefile b/stdlib/Makefile
index 10674f2cd7..39cab1710e 100644
--- a/stdlib/Makefile
+++ b/stdlib/Makefile
@@ -100,10 +100,8 @@ CFLAGS-system.c = -fexceptions
 CFLAGS-system.os = -fomit-frame-pointer
 CFLAGS-fmtmsg.c = -fexceptions
 
-ifneq (,$(filter %REENTRANT, $(defines)))
-CFLAGS-strfmon.c = -D_IO_MTSAFE_IO
-CFLAGS-strfmon_l.c = -D_IO_MTSAFE_IO
-endif
+CFLAGS-strfmon.c = $(libio-mtsafe)
+CFLAGS-strfmon_l.c = $(libio-mtsafe)
 
 CFLAGS-tst-bsearch.c = $(stack-align-test-flags)
 CFLAGS-tst-qsort.c = $(stack-align-test-flags)