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-rw-r--r--bits/libc-header-start.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/bits/libc-header-start.h b/bits/libc-header-start.h
index c6663074a8..6a5850526c 100644
--- a/bits/libc-header-start.h
+++ b/bits/libc-header-start.h
@@ -41,3 +41,12 @@
 #else
 # define __GLIBC_USE_LIB_EXT2 0
 #endif
+
+/* ISO/IEC TS 18661-1:2014 defines the __STDC_WANT_IEC_60559_BFP_EXT__
+   macro.  */
+#undef __GLIBC_USE_IEC_60559_BFP_EXT
+#if defined __USE_GNU || defined __STDC_WANT_IEC_60559_BFP_EXT__
+# define __GLIBC_USE_IEC_60559_BFP_EXT 1
+#else
+# define __GLIBC_USE_IEC_60559_BFP_EXT 0
+#endif