Define __intmax_t, __uintmax_t in bits/types.h.

TS 18661-1 defines *fromfp* functions, which are declared in math.h
and whose return types are intmax_t and uintmax_t, without allowing
math.h to define those typedefs.  (This is similar to e.g. ISO C
declaring vprintf in stdio.h without allowing that header to define
va_list.)  Thus, math.h needs to access those typedefs under internal
names.

This patch accordingly arranges for bits/types.h (which defines only
internal names, not public *_t typedefs) to define __intmax_t and
__uintmax_t.  stdint.h is made to use bits/types.h and define intmax_t
and uintmax_t using __intmax_t and __uintmax_t, to avoid duplication
of information.  (It would be reasonable to define more of the types
in stdint.h - and in sys/types.h, where it duplicates such types -
using information already available in bits/types.h.)  The idea is
that the subsequent addition of fromfp functions would then make
math.h include bits/types.h and use __intmax_t and __uintmax_t as the
return types of those functions.

Tested for x86_64 and x86 (testsuite, and that installed stripped
shared libraries are unchanged by the patch).

	* bits/types.h (__intmax_t): New typedef.
	(__uintmax_t): Likewise.
	* sysdeps/generic/stdint.h: Include <bits/types.h>.
	(intmax_t): Define using __intmax_t.
	(uintmax_t): Define using __uintmax_t.

3 files changed, 18 insertions, 9 deletions

diff --git a/ChangeLog b/ChangeLog
index ad20821e7c..abb3696b44 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,11 @@
 2016-12-30  Joseph Myers  <joseph@codesourcery.com>
 
+	* bits/types.h (__intmax_t): New typedef.
+	(__uintmax_t): Likewise.
+	* sysdeps/generic/stdint.h: Include <bits/types.h>.
+	(intmax_t): Define using __intmax_t.
+	(uintmax_t): Define using __uintmax_t.
+
 	* support/Makefile (tests-special): Make definition conditional on
 	[$(run-built-tests) = yes].
 	($(objpfx)tst-support_record_failure-2.out): Make rule conditional
diff --git a/bits/types.h b/bits/types.h
index 01753bd0dc..8c8fe9fc3f 100644
--- a/bits/types.h
+++ b/bits/types.h
@@ -56,6 +56,15 @@ __extension__ typedef long long int __quad_t;
 __extension__ typedef unsigned long long int __u_quad_t;
 #endif
 
+/* Largest integral types.  */
+#if __WORDSIZE == 64
+typedef long int __intmax_t;
+typedef unsigned long int __uintmax_t;
+#else
+__extension__ typedef long long int __intmax_t;
+__extension__ typedef unsigned long long int __uintmax_t;
+#endif
+
 
 /* The machine-dependent file <bits/typesizes.h> defines __*_T_TYPE
    macros for each of the OS types we define below.  The definitions
diff --git a/sysdeps/generic/stdint.h b/sysdeps/generic/stdint.h
index 8e4347c623..4db6e1ce25 100644
--- a/sysdeps/generic/stdint.h
+++ b/sysdeps/generic/stdint.h
@@ -24,6 +24,7 @@
 
 #define __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION
 #include <bits/libc-header-start.h>
+#include <bits/types.h>
 #include <bits/wchar.h>
 #include <bits/wordsize.h>
 
@@ -131,15 +132,8 @@ typedef unsigned int		uintptr_t;
 
 
 /* Largest integral types.  */
-#if __WORDSIZE == 64
-typedef long int		intmax_t;
-typedef unsigned long int	uintmax_t;
-#else
-__extension__
-typedef long long int		intmax_t;
-__extension__
-typedef unsigned long long int	uintmax_t;
-#endif
+typedef __intmax_t		intmax_t;
+typedef __uintmax_t		uintmax_t;
 
 
 # if __WORDSIZE == 64