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-rw-r--r--bits/libc-header-start.h10
1 files changed, 9 insertions, 1 deletions
diff --git a/bits/libc-header-start.h b/bits/libc-header-start.h
index f2acc5333e..2c7c6e00e0 100644
--- a/bits/libc-header-start.h
+++ b/bits/libc-header-start.h
@@ -60,13 +60,21 @@
 #endif
 
 /* ISO/IEC TS 18661-4:2015 defines the
-   __STDC_WANT_IEC_60559_FUNCS_EXT__ macro.  */
+   __STDC_WANT_IEC_60559_FUNCS_EXT__ macro.  Other than the reduction
+   functions, the symbols from this TS are enabled unconditionally in
+   C2X.  */
 #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
+#undef __GLIBC_USE_IEC_60559_FUNCS_EXT_C2X
+#if __GLIBC_USE (IEC_60559_FUNCS_EXT) || __GLIBC_USE (ISOC2X)
+# define __GLIBC_USE_IEC_60559_FUNCS_EXT_C2X 1
+#else
+# define __GLIBC_USE_IEC_60559_FUNCS_EXT_C2X 0
+#endif
 
 /* ISO/IEC TS 18661-3:2015 defines the
    __STDC_WANT_IEC_60559_TYPES_EXT__ macro.  */