define LONG_MAX via arch alltypes.h, strip down bits/limits.h

LLONG_MAX is uniform for all archs we support and plenty of header and
code level logic assumes it is, so it does not make sense for limits.h
bits mechanism to pretend it's variable.

LONG_BIT can be defined in terms of LONG_MAX; there's no reason to put
it in bits.

by moving LONG_MAX definition to __LONG_MAX in alltypes.h and moving
LLONG_MAX out of bits, there are now no plain-C limits that are
defined in the bits header, so the bits header only needs to be
included in the POSIX or extended profiles. this allows the feature
test macro logic to be removed from the bits header, facilitating a
long-term goal of getting such logic out of bits.

having __LONG_MAX in alltypes.h will allow further generalization of
headers.

archs without a constant PAGESIZE no longer need bits/limits.h at all.

arch/aarch64/bits/alltypes.h.in

@@ -8,6 +8,8 @@
 #define __BYTE_ORDER 1234
 #endif
 
+#define __LONG_MAX 0x7fffffffffffffffL
+
 #ifndef __cplusplus
 TYPEDEF unsigned wchar_t;
 #endif

arch/aarch64/bits/limits.h

-#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
- || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
-#define LONG_BIT 64
-#endif
-
-#define LONG_MAX  0x7fffffffffffffffL
-#define LLONG_MAX  0x7fffffffffffffffLL

arch/arm/bits/alltypes.h.in

@@ -8,6 +8,8 @@
 #define __BYTE_ORDER 1234
 #endif
 
+#define __LONG_MAX 0x7fffffffL
+
 #ifndef __cplusplus
 TYPEDEF unsigned wchar_t;
 #endif

arch/arm/bits/limits.h

-#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
- || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
-#define LONG_BIT 32
-#endif
-
-#define LONG_MAX  0x7fffffffL
-#define LLONG_MAX  0x7fffffffffffffffLL

arch/i386/bits/alltypes.h.in

@@ -3,6 +3,7 @@
 #define _Reg int
 
 #define __BYTE_ORDER 1234
+#define __LONG_MAX 0x7fffffffL
 
 #ifndef __cplusplus
 #ifdef __WCHAR_TYPE__

arch/i386/bits/limits.h

-#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
- || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
 #define PAGESIZE 4096
-#define LONG_BIT 32
-#endif
-
-#define LONG_MAX  0x7fffffffL
-#define LLONG_MAX  0x7fffffffffffffffLL

arch/m68k/bits/alltypes.h.in

@@ -3,6 +3,7 @@
 #define _Reg int
 
 #define __BYTE_ORDER 4321
+#define __LONG_MAX 0x7fffffffL
 
 #ifndef __cplusplus
 #ifdef __WCHAR_TYPE__

arch/m68k/bits/limits.h

-#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
- || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
-#define LONG_BIT 32
-#endif
-
-#define LONG_MAX  0x7fffffffL
-#define LLONG_MAX  0x7fffffffffffffffLL

arch/microblaze/bits/alltypes.h.in

@@ -8,6 +8,8 @@
 #define __BYTE_ORDER 4321
 #endif
 
+#define __LONG_MAX 0x7fffffffL
+
 #ifndef __cplusplus
 TYPEDEF int wchar_t;
 #endif

arch/microblaze/bits/limits.h

-#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
- || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
-#define LONG_BIT 32
-#endif
-
-#define LONG_MAX  0x7fffffffL
-#define LLONG_MAX  0x7fffffffffffffffLL

arch/mips/bits/alltypes.h.in

@@ -8,6 +8,8 @@
 #define __BYTE_ORDER 4321
 #endif
 
+#define __LONG_MAX 0x7fffffffL
+
 #ifndef __cplusplus
 TYPEDEF int wchar_t;
 #endif

arch/mips/bits/limits.h

-#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
- || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
-#define LONG_BIT 32
-#endif
-
-#define LONG_MAX  0x7fffffffL
-#define LLONG_MAX  0x7fffffffffffffffLL

arch/mips64/bits/alltypes.h.in

@@ -8,6 +8,8 @@
 #define __BYTE_ORDER 4321
 #endif
 
+#define __LONG_MAX 0x7fffffffffffffffL
+
 #ifndef __cplusplus
 TYPEDEF int wchar_t;
 #endif

arch/mips64/bits/limits.h

-#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
- || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
-#define LONG_BIT 64
-#endif
-
-#define LONG_MAX 0x7fffffffffffffffL
-#define LLONG_MAX 0x7fffffffffffffffLL

arch/mipsn32/bits/alltypes.h.in

@@ -8,6 +8,8 @@
 #define __BYTE_ORDER 4321
 #endif
 
+#define __LONG_MAX 0x7fffffffL
+
 #ifndef __cplusplus
 TYPEDEF int wchar_t;
 #endif

arch/mipsn32/bits/limits.h

-#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
- || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
-#define LONG_BIT 32
-#endif
-
-#define LONG_MAX  0x7fffffffL
-#define LLONG_MAX  0x7fffffffffffffffLL

arch/or1k/bits/alltypes.h.in

@@ -3,6 +3,7 @@
 #define _Reg int
 
 #define __BYTE_ORDER 4321
+#define __LONG_MAX 0x7fffffffL
 
 #ifndef __cplusplus
 TYPEDEF unsigned wchar_t;

arch/or1k/bits/limits.h

-#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
- || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
 #define PAGESIZE 8192
-#define LONG_BIT 32
-#endif
-
-#define LONG_MAX  0x7fffffffL
-#define LLONG_MAX  0x7fffffffffffffffLL

arch/powerpc/bits/alltypes.h.in

@@ -3,6 +3,7 @@
 #define _Reg int
 
 #define __BYTE_ORDER 4321
+#define __LONG_MAX 0x7fffffffL
 
 #ifndef __cplusplus
 #ifdef __WCHAR_TYPE__

arch/powerpc/bits/limits.h

-#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
- || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
-#define LONG_BIT 32
-#endif
-
-#define LONG_MAX  0x7fffffffL
-#define LLONG_MAX  0x7fffffffffffffffLL

arch/powerpc64/bits/alltypes.h.in

@@ -8,6 +8,8 @@
 #define __BYTE_ORDER 1234
 #endif
 
+#define __LONG_MAX 0x7fffffffffffffffL
+
 #ifndef __cplusplus
 TYPEDEF int wchar_t;
 #endif

arch/powerpc64/bits/limits.h

-#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
- || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
-#define LONG_BIT 64
-#endif
-
-#define LONG_MAX  0x7fffffffffffffffL
-#define LLONG_MAX  0x7fffffffffffffffLL

arch/riscv64/bits/alltypes.h.in

@@ -3,6 +3,7 @@
 #define _Reg long
 
 #define __BYTE_ORDER 1234
+#define __LONG_MAX 0x7fffffffffffffffL
 
 #ifndef __cplusplus
 TYPEDEF int wchar_t;

arch/riscv64/bits/limits.h

-#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
- || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
-#define LONG_BIT 64
-#endif
-
-#define LONG_MAX  0x7fffffffffffffffL
-#define LLONG_MAX  0x7fffffffffffffffLL

arch/s390x/bits/alltypes.h.in

@@ -3,6 +3,7 @@
 #define _Reg long
 
 #define __BYTE_ORDER 4321
+#define __LONG_MAX 0x7fffffffffffffffL
 
 #ifndef __cplusplus
 TYPEDEF int wchar_t;

arch/s390x/bits/limits.h

-#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
- || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
 #define PAGESIZE 4096
-#define LONG_BIT 64
-#endif
-
-#define LONG_MAX  0x7fffffffffffffffL
-#define LLONG_MAX  0x7fffffffffffffffLL

arch/sh/bits/alltypes.h.in

@@ -8,6 +8,8 @@
 #define __BYTE_ORDER 1234
 #endif
 
+#define __LONG_MAX 0x7fffffffL
+
 #ifndef __cplusplus
 #ifdef __WCHAR_TYPE__
 TYPEDEF __WCHAR_TYPE__ wchar_t;

arch/sh/bits/limits.h

-#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
- || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
 #define PAGESIZE 4096
-#define LONG_BIT 32
-#endif
-
-#define LONG_MAX  0x7fffffffL
-#define LLONG_MAX  0x7fffffffffffffffLL

arch/x32/bits/alltypes.h.in

@@ -3,6 +3,7 @@
 #define _Reg long long
 
 #define __BYTE_ORDER 1234
+#define __LONG_MAX 0x7fffffffL
 
 #ifndef __cplusplus
 #ifdef __WCHAR_TYPE__

arch/x32/bits/limits.h

-#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
- || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
 #define PAGESIZE 4096
-#define LONG_BIT 32
-#endif
-
-#define LONG_MAX  0x7fffffffL
-#define LLONG_MAX  0x7fffffffffffffffLL

arch/x86_64/bits/alltypes.h.in

@@ -3,6 +3,7 @@
 #define _Reg long
 
 #define __BYTE_ORDER 1234
+#define __LONG_MAX 0x7fffffffffffffffL
 
 #ifndef __cplusplus
 TYPEDEF int wchar_t;

arch/x86_64/bits/limits.h

-#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
- || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
 #define PAGESIZE 4096
-#define LONG_BIT 64
-#endif
-
-#define LONG_MAX  0x7fffffffffffffffL
-#define LLONG_MAX  0x7fffffffffffffffLL

include/limits.h

@@ -3,9 +3,7 @@
 
 #include <features.h>
 
-/* Most limits are system-specific */
-
-#include <bits/limits.h>
+#include <bits/alltypes.h> /* __LONG_MAX */
 
 /* Support signed or unsigned plain-char */
 
@@ -17,8 +15,6 @@
 #define CHAR_MAX 127
 #endif
 
-/* Some universal constants... */
-
 #define CHAR_BIT 8
 #define SCHAR_MIN (-128)
 #define SCHAR_MAX 127
@@ -30,8 +26,10 @@
 #define INT_MAX  0x7fffffff
 #define UINT_MAX 0xffffffffU
 #define LONG_MIN (-LONG_MAX-1)
+#define LONG_MAX __LONG_MAX
 #define ULONG_MAX (2UL*LONG_MAX+1)
 #define LLONG_MIN (-LLONG_MAX-1)
+#define LLONG_MAX  0x7fffffffffffffffLL
 #define ULLONG_MAX (2ULL*LLONG_MAX+1)
 
 #define MB_LEN_MAX 4
@@ -39,6 +37,8 @@
 #if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
  || defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
 
+#include <bits/limits.h>
+
 #define PIPE_BUF 4096
 #define FILESIZEBITS 64
 #define NAME_MAX 255
@@ -53,6 +53,12 @@
 #define TTY_NAME_MAX 32
 #define HOST_NAME_MAX 255
 
+#if LONG_MAX == 0x7fffffffL
+#define LONG_BIT 32
+#else
+#define LONG_BIT 64
+#endif
+
 /* Implementation choices... */
 
 #define PTHREAD_KEYS_MAX 128