/* Handle feature test macros at the start of a header.
- Copyright (C) 2016-2019 Free Software Foundation, Inc.
+ Copyright (C) 2016-2023 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
- <http://www.gnu.org/licenses/>. */
+ <https://www.gnu.org/licenses/>. */
/* This header is internal to glibc and should not be included outside
of glibc headers. Headers including it must define
/* ISO/IEC TS 18661-1:2014 defines the __STDC_WANT_IEC_60559_BFP_EXT__
macro. Most but not all symbols enabled by that macro in TS
- 18661-1 are enabled unconditionally in C2X; the symbols in Annex F
- still require that macro in C2X. */
+ 18661-1 are enabled unconditionally in C2X. In C2X, the symbols in
+ Annex F still require a new feature test macro
+ __STDC_WANT_IEC_60559_EXT__ instead (C2X does not define
+ __STDC_WANT_IEC_60559_BFP_EXT__), while a few features from TS
+ 18661-1 are not included in C2X (and thus should depend on
+ __STDC_WANT_IEC_60559_BFP_EXT__ even when C2X features are
+ enabled).
+
+ __GLIBC_USE (IEC_60559_BFP_EXT) controls those features from TS
+ 18661-1 not included in C2X.
+
+ __GLIBC_USE (IEC_60559_BFP_EXT_C2X) controls those features from TS
+ 18661-1 that are also included in C2X (with no feature test macro
+ required in C2X).
+
+ __GLIBC_USE (IEC_60559_EXT) controls those features from TS 18661-1
+ that are included in C2X but conditional on
+ __STDC_WANT_IEC_60559_EXT__. (There are currently no features
+ conditional on __STDC_WANT_IEC_60559_EXT__ that are not in TS
+ 18661-1.) */
#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_C2X 0
#endif
+#undef __GLIBC_USE_IEC_60559_EXT
+#if __GLIBC_USE (IEC_60559_BFP_EXT) || defined __STDC_WANT_IEC_60559_EXT__
+# define __GLIBC_USE_IEC_60559_EXT 1
+#else
+# define __GLIBC_USE_IEC_60559_EXT 0
+#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. */