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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 6a5850526c..ee6a876d82 100644
--- a/bits/libc-header-start.h
+++ b/bits/libc-header-start.h
@@ -50,3 +50,12 @@
#else
# define __GLIBC_USE_IEC_60559_BFP_EXT 0
#endif
+
+/* ISO/IEC TS 18661-4:2015 defines the
+ __STDC_WANT_IEC_60559_FUNCS_EXT__ macro. */
+#undef __GLIBC_USE_IEC_60559_FUNCS_EXT
+#if defined __USE_GNU || defined __STDC_WANT_IEC_60559_FUNCS_EXT__
+# define __GLIBC_USE_IEC_60559_FUNCS_EXT 1
+#else
+# define __GLIBC_USE_IEC_60559_FUNCS_EXT 0
+#endif