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Attached is a patch that uses autoconf to determine whether there

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is a working 64-bit-int type available.

In playing around with it on my machine, I found that gcc provides
perfectly fine support for "long long" arithmetic ... but sprintf()
and sscanf(), which are system-supplied, don't work :-(.  So the
autoconf test program does a cursory test on them too.

If we find that a lot of systems are like this, it might be worth
the trouble to implement binary<->ASCII conversion of int64 ourselves
rather than relying on sprintf/sscanf to handle the data type.

			regards, tom lane
This commit is contained in:
Bruce Momjian 1998-08-23 22:25:54 +00:00
parent 9cad9febb1
commit 07ae591c87
5 changed files with 96 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
src/backend/parser/gram.c
View File

@ -219,7 +219,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/parser/Attic/gram.c,v 2.27 1998/08/19 14:51:26 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/parser/Attic/gram.c,v 2.28 1998/08/23 22:25:47 momjian Exp $
*
* HISTORY
* AUTHOR DATE MAJOR EVENT

4
src/backend/parser/scan.c
View File

@ -1,7 +1,7 @@
/* A lexical scanner generated by flex */
/* Scanner skeleton version:
* $Header: /cvsroot/pgsql/src/backend/parser/Attic/scan.c,v 1.23 1998/08/17 03:50:15 scrappy Exp $
* $Header: /cvsroot/pgsql/src/backend/parser/Attic/scan.c,v 1.24 1998/08/23 22:25:51 momjian Exp $
*/
#define FLEX_SCANNER
@ -555,7 +555,7 @@ char *yytext;
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/parser/Attic/scan.c,v 1.23 1998/08/17 03:50:15 scrappy Exp $
* $Header: /cvsroot/pgsql/src/backend/parser/Attic/scan.c,v 1.24 1998/08/23 22:25:51 momjian Exp $
*
*-------------------------------------------------------------------------
*/

78
src/configure.in
View File

@ -522,7 +522,83 @@ AC_TRY_RUN([#include <stdlib.h>
#endif
main() { double d = DBL_MIN; if (d != DBL_MIN) exit(-1); else exit(0); }],
AC_MSG_RESULT(yes),
[AC_MSG_RESULT(no) AC_DEFINE(HAVE_DBL_MIN_PROBLEM)])
[AC_MSG_RESULT(no) AC_DEFINE(HAVE_DBL_MIN_PROBLEM)],
AC_MSG_RESULT(assuming ok on target machine))
dnl Check to see if we have a working 64-bit integer type.
AC_MSG_CHECKING(whether 'long int' is 64 bits)
AC_TRY_RUN([#include <stdio.h>
typedef long int int64;
#define INT64_FORMAT "%ld"
int64 a = 20000001;
int64 b = 40000005;
int does_int64_work()
{
int64 c,d,e;
char buf[100];
if (sizeof(int64) != 8)
return 0; /* doesn't look like the right size */
/* we do perfunctory checks on multiply, divide, sprintf, sscanf */
c = a * b;
sprintf(buf, INT64_FORMAT, c);
if (strcmp(buf, "800000140000005") != 0)
return 0; /* either multiply or sprintf is busted */
if (sscanf(buf, INT64_FORMAT, &d) != 1)
return 0;
if (d != c)
return 0;
e = d / b;
if (e != a)
return 0;
return 1;
}
main() {
exit(! does_int64_work());
}],
[AC_MSG_RESULT(yes) AC_DEFINE(HAVE_LONG_INT_64)],
AC_MSG_RESULT(no),
AC_MSG_RESULT(assuming not on target machine))
AC_MSG_CHECKING(whether 'long long int' is 64 bits)
AC_TRY_RUN([#include <stdio.h>
typedef long long int int64;
#define INT64_FORMAT "%Ld"
int64 a = 20000001;
int64 b = 40000005;
int does_int64_work()
{
int64 c,d,e;
char buf[100];
if (sizeof(int64) != 8)
return 0; /* doesn't look like the right size */
/* we do perfunctory checks on multiply, divide, sprintf, sscanf */
c = a * b;
sprintf(buf, INT64_FORMAT, c);
if (strcmp(buf, "800000140000005") != 0)
return 0; /* either multiply or sprintf is busted */
if (sscanf(buf, INT64_FORMAT, &d) != 1)
return 0;
if (d != c)
return 0;
e = d / b;
if (e != a)
return 0;
return 1;
}
main() {
exit(! does_int64_work());
}],
[AC_MSG_RESULT(yes) AC_DEFINE(HAVE_LONG_LONG_INT_64)],
AC_MSG_RESULT(no),
AC_MSG_RESULT(assuming not on target machine))
dnl Checks for library functions.
AC_PROG_GCC_TRADITIONAL

6
src/include/config.h.in
View File

@ -219,6 +219,12 @@ extern void srandom(int seed);
/* Set to 1 if your DBL_MIN is problematic */
#undef HAVE_DBL_MIN_PROBLEM
/* Set to 1 if type "long int" works and is 64 bits */
#undef HAVE_LONG_INT_64
/* Set to 1 if type "long long int" works and is 64 bits */
#undef HAVE_LONG_LONG_INT_64
/*
* Code below this point should not require changes
*/

27
src/include/utils/int8.h
View File

@ -6,7 +6,7 @@
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: int8.h,v 1.1 1998/07/08 14:10:30 thomas Exp $
* $Id: int8.h,v 1.2 1998/08/23 22:25:54 momjian Exp $
*
* NOTES
* These data types are supported on all 64-bit architectures, and may
@ -23,29 +23,22 @@
#ifndef INT8_H
#define INT8_H
#if defined(__alpha) || defined(PPC)
#ifdef HAVE_LONG_INT_64
/* Plain "long int" fits, use it */
typedef long int int64;
#define INT64_FORMAT "%ld"
#elif defined(__GNUC__) && defined(i386)
typedef long long int int64;
#define INT64_FORMAT "%Ld"
#else
#ifdef HAVE_LONG_LONG_INT_64
/* We have working support for "long long int", use that */
typedef long long int int64;
#define INT64_FORMAT "%Ld"
#else
/* Won't actually work, but fall back to long int so that int8.c compiles */
typedef long int int64;
#define INT64_FORMAT "%ld"
#define INT64_IS_BUSTED
#endif
/*
#if sizeof(int64) == 8
#define HAVE_64BIT_INTS 1
#endif
*/
extern int64 *int8in(char *str);
extern char *int8out(int64 * val);