Define TS 18661-1 type width macros in <limits.h> and <stdint.h>.

TS 18661-1 defines <limits.h> and <stdint.h> macros for widths of
standard integer types and the typedefs defined in, or whose limits
are defined in, <stdint.h>.  (The connection to the main
floating-point subject matter of TS 18661-1 is that these are intended
to be used with the fromfp functions to convert from floating point to
integer types of any width in any rounding direction, though these
macros may be of more general use.)

This patch implements support for these macros in GCC's <limits.h> and
<stdint.h>.  To avoid needing to implement fixincludes for system
headers where GCC wraps the system libc's <stdint.h> in hosted mode,
the test for the <stdint.h> macros uses -ffreestanding (I'll add the
macros to glibc's headers separately) - but as usual for new features
in these headers, platforms (primarily OpenBSD) that use USER_H to
avoid using GCC's headers at all will have failures until the system
headers have the feature added or appropriate fixincludes are
implemented.

The header macros are implemented using appropriate new predefined
macros, with the code avoiding defining more such macros than
necessary (so one predefined macro suffices for corresponding signed
and unsigned types, while no such predefined macros are needed for the
exact-width types such as int8_t).

Bootstrapped with no regressions on x86_64-pc-linux-gnu.

gcc:
	* doc/cpp.texi (__SCHAR_WIDTH__, __SHRT_WIDTH__, __INT_WIDTH__)
	(__LONG_WIDTH__, __LONG_LONG_WIDTH__, __PTRDIFF_WIDTH__)
	(__SIG_ATOMIC_WIDTH__, __SIZE_WIDTH__, __WCHAR_WIDTH__)
	(__WINT_WIDTH__, __INT_LEAST8_WIDTH__, __INT_LEAST16_WIDTH__)
	(__INT_LEAST32_WIDTH__, __INT_LEAST64_WIDTH__)
	(__INT_FAST8_WIDTH__, __INT_FAST16_WIDTH__, __INT_FAST32_WIDTH__)
	(__INT_FAST64_WIDTH__, __INTPTR_WIDTH__, __INTMAX_WIDTH__):
	Document.
	* ginclude/stdint-gcc.h [__STDC_WANT_IEC_60559_BFP_EXT__]: Define
	width macros from TS 18661-1.
	* glimits.h [__STDC_WANT_IEC_60559_BFP_EXT__]: Likewise.

gcc/c-family:
	* c-cppbuiltin.c (builtin_define_type_width): New function.
	(builtin_define_stdint_macros, c_cpp_builtins): Define type width
	macros.

gcc/testsuite:
	* gcc.dg/limits-width-1.c, gcc.dg/stdint-width-1.c: New tests.

From-SVN: r240048

1 files changed, 101 insertions, 0 deletions

diff --git a/gcc/ginclude/stdint-gcc.h b/gcc/ginclude/stdint-gcc.h
index 6d208af..610e118 100644
--- a/gcc/ginclude/stdint-gcc.h
+++ b/gcc/ginclude/stdint-gcc.h
@@ -260,4 +260,105 @@ typedef __UINTMAX_TYPE__ uintmax_t;
 #endif /* (!defined __cplusplus || __cplusplus >= 201103L
 	   || defined __STDC_CONSTANT_MACROS) */
 
+#ifdef __STDC_WANT_IEC_60559_BFP_EXT__
+/* TS 18661-1 widths of integer types.  */
+
+#ifdef __INT8_TYPE__
+# undef INT8_WIDTH
+# define INT8_WIDTH 8
+#endif
+#ifdef __UINT8_TYPE__
+# undef UINT8_WIDTH
+# define UINT8_WIDTH 8
+#endif
+#ifdef __INT16_TYPE__
+# undef INT16_WIDTH
+# define INT16_WIDTH 16
+#endif
+#ifdef __UINT16_TYPE__
+# undef UINT16_WIDTH
+# define UINT16_WIDTH 16
+#endif
+#ifdef __INT32_TYPE__
+# undef INT32_WIDTH
+# define INT32_WIDTH 32
+#endif
+#ifdef __UINT32_TYPE__
+# undef UINT32_WIDTH
+# define UINT32_WIDTH 32
+#endif
+#ifdef __INT64_TYPE__
+# undef INT64_WIDTH
+# define INT64_WIDTH 64
+#endif
+#ifdef __UINT64_TYPE__
+# undef UINT64_WIDTH
+# define UINT64_WIDTH 64
+#endif
+
+#undef INT_LEAST8_WIDTH
+#define INT_LEAST8_WIDTH __INT_LEAST8_WIDTH__
+#undef UINT_LEAST8_WIDTH
+#define UINT_LEAST8_WIDTH __INT_LEAST8_WIDTH__
+#undef INT_LEAST16_WIDTH
+#define INT_LEAST16_WIDTH __INT_LEAST16_WIDTH__
+#undef UINT_LEAST16_WIDTH
+#define UINT_LEAST16_WIDTH __INT_LEAST16_WIDTH__
+#undef INT_LEAST32_WIDTH
+#define INT_LEAST32_WIDTH __INT_LEAST32_WIDTH__
+#undef UINT_LEAST32_WIDTH
+#define UINT_LEAST32_WIDTH __INT_LEAST32_WIDTH__
+#undef INT_LEAST64_WIDTH
+#define INT_LEAST64_WIDTH __INT_LEAST64_WIDTH__
+#undef UINT_LEAST64_WIDTH
+#define UINT_LEAST64_WIDTH __INT_LEAST64_WIDTH__
+
+#undef INT_FAST8_WIDTH
+#define INT_FAST8_WIDTH __INT_FAST8_WIDTH__
+#undef UINT_FAST8_WIDTH
+#define UINT_FAST8_WIDTH __INT_FAST8_WIDTH__
+#undef INT_FAST16_WIDTH
+#define INT_FAST16_WIDTH __INT_FAST16_WIDTH__
+#undef UINT_FAST16_WIDTH
+#define UINT_FAST16_WIDTH __INT_FAST16_WIDTH__
+#undef INT_FAST32_WIDTH
+#define INT_FAST32_WIDTH __INT_FAST32_WIDTH__
+#undef UINT_FAST32_WIDTH
+#define UINT_FAST32_WIDTH __INT_FAST32_WIDTH__
+#undef INT_FAST64_WIDTH
+#define INT_FAST64_WIDTH __INT_FAST64_WIDTH__
+#undef UINT_FAST64_WIDTH
+#define UINT_FAST64_WIDTH __INT_FAST64_WIDTH__
+
+#ifdef __INTPTR_TYPE__
+# undef INTPTR_WIDTH
+# define INTPTR_WIDTH __INTPTR_WIDTH__
+#endif
+#ifdef __UINTPTR_TYPE__
+# undef UINTPTR_WIDTH
+# define UINTPTR_WIDTH __INTPTR_WIDTH__
+#endif
+
+#undef INTMAX_WIDTH
+#define INTMAX_WIDTH __INTMAX_WIDTH__
+#undef UINTMAX_WIDTH
+#define UINTMAX_WIDTH __INTMAX_WIDTH__
+
+#undef PTRDIFF_WIDTH
+#define PTRDIFF_WIDTH __PTRDIFF_WIDTH__
+
+#undef SIG_ATOMIC_WIDTH
+#define SIG_ATOMIC_WIDTH __SIG_ATOMIC_WIDTH__
+
+#undef SIZE_WIDTH
+#define SIZE_WIDTH __SIZE_WIDTH__
+
+#undef WCHAR_WIDTH
+#define WCHAR_WIDTH __WCHAR_WIDTH__
+
+#undef WINT_WIDTH
+#define WINT_WIDTH __WINT_WIDTH__
+
+#endif
+
 #endif /* _GCC_STDINT_H */