Require stdint.h

stdint.h belongs to the compiler (as opposed to inttypes.h), so by
requiring a C99 compiler we can also require stdint.h
unconditionally.  Remove configure checks and other workarounds for
it.

This also removes a few steps in the required portability adjustments
to the imported time zone code, which can be applied on the next
import.

When using GCC on a platform that is otherwise pre-C99, this will now
require at least GCC 4.5, which is the first release that supplied a
standard-conforming stdint.h if the native platform didn't have it.

Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://www.postgresql.org/message-id/flat/5d398bbb-262a-5fed-d839-d0e5cff3c0d7%402ndquadrant.com

src/include/c.h

@@ -64,9 +64,7 @@
 #ifdef HAVE_STRINGS_H
 #include <strings.h>
 #endif
-#ifdef HAVE_STDINT_H
 #include <stdint.h>
-#endif
 #include <sys/types.h>
 #include <errno.h>
 #if defined(WIN32) || defined(__CYGWIN__)
@@ -429,8 +427,8 @@ typedef unsigned PG_INT128_TYPE uint128
 #endif
 
 /*
- * stdint.h limits aren't guaranteed to be present and aren't guaranteed to
- * have compatible types with our fixed width types. So just define our own.
+ * stdint.h limits aren't guaranteed to have compatible types with our fixed
+ * width types. So just define our own.
  */
 #define PG_INT8_MIN		(-0x7F-1)
 #define PG_INT8_MAX		(0x7F)
@@ -445,15 +443,6 @@ typedef unsigned PG_INT128_TYPE uint128
 #define PG_INT64_MAX	INT64CONST(0x7FFFFFFFFFFFFFFF)
 #define PG_UINT64_MAX	UINT64CONST(0xFFFFFFFFFFFFFFFF)
 
-/* Max value of size_t might also be missing if we don't have stdint.h */
-#ifndef SIZE_MAX
-#if SIZEOF_SIZE_T == 8
-#define SIZE_MAX PG_UINT64_MAX
-#else
-#define SIZE_MAX PG_UINT32_MAX
-#endif
-#endif
-
 /*
  * We now always use int64 timestamps, but keep this symbol defined for the
  * benefit of external code that might test it.

src/include/pg_config.h.in

@@ -310,9 +310,6 @@
 /* Define to 1 if the system has the type `int8'. */
 #undef HAVE_INT8
 
-/* Define to 1 if the system has the type `intptr_t'. */
-#undef HAVE_INTPTR_T
-
 /* Define to 1 if you have the <inttypes.h> header file. */
 #undef HAVE_INTTYPES_H
 
@@ -680,9 +677,6 @@
 /* Define to 1 if the system has the type `uint8'. */
 #undef HAVE_UINT8
 
-/* Define to 1 if the system has the type `uintptr_t'. */
-#undef HAVE_UINTPTR_T
-
 /* Define to 1 if the system has the type `union semun'. */
 #undef HAVE_UNION_SEMUN
 
@@ -1006,10 +1000,6 @@
 #undef inline
 #endif
 
-/* Define to the type of a signed integer type wide enough to hold a pointer,
-   if such a type exists, and if the system does not define it. */
-#undef intptr_t
-
 /* Define to keyword to use for C99 restrict support, or to nothing if not
    supported */
 #undef pg_restrict
@@ -1033,7 +1023,3 @@
 
 /* Define to how the compiler spells `typeof'. */
 #undef typeof
-
-/* Define to the type of an unsigned integer type wide enough to hold a
-   pointer, if such a type exists, and if the system does not define it. */
-#undef uintptr_t

src/timezone/README

@@ -70,11 +70,8 @@ old-style function declarations to C89 style, but thank goodness they
 fixed that.)
 
 * We need the code to follow Postgres' portability conventions; this
-includes relying on configure's results rather than hand-hacked #defines,
-and not relying on <stdint.h> features that may not exist on old systems.
-(In particular this means using Postgres' definitions of the int32 and
-int64 typedefs, not int_fast32_t/int_fast64_t.  Likewise we use
-PG_INT32_MIN/MAX not INT32_MIN/MAX.)
+includes relying on configure's results rather than hand-hacked
+#defines (see private.h).
 
 * Since Postgres is typically built on a system that has its own copy
 of the <time.h> functions, we must avoid conflicting with those.  This
@@ -112,13 +109,6 @@ to first run the tzcode source files through a sed filter like this:
         -e 's|^\*/| */|' \
         -e 's/\bregister[ \t]//g' \
         -e 's/\bATTRIBUTE_PURE[ \t]//g' \
-        -e 's/int_fast32_t/int32/g' \
-        -e 's/int_fast64_t/int64/g' \
-        -e 's/intmax_t/int64/g' \
-        -e 's/INT32_MIN/PG_INT32_MIN/g' \
-        -e 's/INT32_MAX/PG_INT32_MAX/g' \
-        -e 's/INTMAX_MIN/PG_INT64_MIN/g' \
-        -e 's/INTMAX_MAX/PG_INT64_MAX/g' \
         -e 's/struct[ \t]+tm\b/struct pg_tm/g' \
         -e 's/\btime_t\b/pg_time_t/g' \
         -e 's/lineno/lineno_t/g' \

src/tools/msvc/Solution.pm

@@ -275,7 +275,6 @@ sub GenerateFiles
 		HAVE_INT_TIMEZONE                           => 1,
 		HAVE_INT64                                  => undef,
 		HAVE_INT8                                   => undef,
-		HAVE_INTPTR_T                               => undef,
 		HAVE_INTTYPES_H                             => undef,
 		HAVE_INT_OPTERR                             => undef,
 		HAVE_INT_OPTRESET                           => undef,
@@ -396,7 +395,6 @@ sub GenerateFiles
 		HAVE_UCRED_H                             => undef,
 		HAVE_UINT64                              => undef,
 		HAVE_UINT8                               => undef,
-		HAVE_UINTPTR_T                           => undef,
 		HAVE_UNION_SEMUN                         => undef,
 		HAVE_UNISTD_H                            => 1,
 		HAVE_UNIX_SOCKETS                        => undef,
@@ -496,13 +494,11 @@ sub GenerateFiles
 		_LARGEFILE_SOURCE => undef,
 		_LARGE_FILES      => undef,
 		inline            => '__inline',
-		intptr_t          => undef,
 		pg_restrict       => '__restrict',
 		# not defined, because it'd conflict with __declspec(restrict)
 		restrict  => undef,
 		signed    => undef,
-		typeof    => undef,
-		uintptr_t => undef,);
+		typeof    => undef,);
 
 	if ($self->{options}->{uuid})
 	{