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-rw-r--r--stdio-common/Makefile4
-rw-r--r--stdio-common/isoc99_scanf.c4
2 files changed, 5 insertions, 3 deletions
diff --git a/stdio-common/Makefile b/stdio-common/Makefile
index a29924bc7c..5d7ab532f4 100644
--- a/stdio-common/Makefile
+++ b/stdio-common/Makefile
@@ -123,9 +123,7 @@ scanf13-ENV = LOCPATH=$(common-objpfx)localedata
bug14-ENV = LOCPATH=$(common-objpfx)localedata
tst-grouping-ENV = LOCPATH=$(common-objpfx)localedata
-ifneq (,$(filter %REENTRANT, $(defines)))
-CPPFLAGS += -D_IO_MTSAFE_IO
-endif
+CPPFLAGS += $(libio-mtsafe)
$(objpfx)tst-setvbuf1.out: tst-setvbuf1.expect $(objpfx)tst-setvbuf1
$(built-program-cmd) > $@ 2>&1
diff --git a/stdio-common/isoc99_scanf.c b/stdio-common/isoc99_scanf.c
index 2e04e700e4..2bd1e512c1 100644
--- a/stdio-common/isoc99_scanf.c
+++ b/stdio-common/isoc99_scanf.c
@@ -28,13 +28,17 @@ __isoc99_scanf (const char *format, ...)
va_list arg;
int done;
+#ifdef _IO_MTSAFE_IO
_IO_acquire_lock_clear_flags2 (stdin);
+#endif
stdin->_flags2 |= _IO_FLAGS2_SCANF_STD;
va_start (arg, format);
done = _IO_vfscanf (stdin, format, arg, NULL);
va_end (arg);
+#ifdef _IO_MTSAFE_IO
_IO_release_lock (stdin);
+#endif
return done;
}