Attached is a patch that uses autoconf to determine whether there
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
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@ -219,7 +219,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/parser/Attic/gram.c,v 2.27 1998/08/19 14:51:26 momjian Exp $
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* $Header: /cvsroot/pgsql/src/backend/parser/Attic/gram.c,v 2.28 1998/08/23 22:25:47 momjian Exp $
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*
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* HISTORY
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* AUTHOR DATE MAJOR EVENT
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@ -1,7 +1,7 @@
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/* A lexical scanner generated by flex */
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/* Scanner skeleton version:
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* $Header: /cvsroot/pgsql/src/backend/parser/Attic/scan.c,v 1.23 1998/08/17 03:50:15 scrappy Exp $
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* $Header: /cvsroot/pgsql/src/backend/parser/Attic/scan.c,v 1.24 1998/08/23 22:25:51 momjian Exp $
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*/
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#define FLEX_SCANNER
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@ -555,7 +555,7 @@ char *yytext;
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/parser/Attic/scan.c,v 1.23 1998/08/17 03:50:15 scrappy Exp $
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* $Header: /cvsroot/pgsql/src/backend/parser/Attic/scan.c,v 1.24 1998/08/23 22:25:51 momjian Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -522,7 +522,83 @@ AC_TRY_RUN([#include <stdlib.h>
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#endif
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main() { double d = DBL_MIN; if (d != DBL_MIN) exit(-1); else exit(0); }],
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AC_MSG_RESULT(yes),
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[AC_MSG_RESULT(no) AC_DEFINE(HAVE_DBL_MIN_PROBLEM)])
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[AC_MSG_RESULT(no) AC_DEFINE(HAVE_DBL_MIN_PROBLEM)],
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AC_MSG_RESULT(assuming ok on target machine))
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dnl Check to see if we have a working 64-bit integer type.
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AC_MSG_CHECKING(whether 'long int' is 64 bits)
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AC_TRY_RUN([#include <stdio.h>
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typedef long int int64;
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#define INT64_FORMAT "%ld"
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int64 a = 20000001;
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int64 b = 40000005;
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int does_int64_work()
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{
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int64 c,d,e;
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char buf[100];
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if (sizeof(int64) != 8)
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return 0; /* doesn't look like the right size */
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/* we do perfunctory checks on multiply, divide, sprintf, sscanf */
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c = a * b;
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sprintf(buf, INT64_FORMAT, c);
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if (strcmp(buf, "800000140000005") != 0)
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return 0; /* either multiply or sprintf is busted */
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if (sscanf(buf, INT64_FORMAT, &d) != 1)
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return 0;
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if (d != c)
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return 0;
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e = d / b;
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if (e != a)
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return 0;
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return 1;
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}
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main() {
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exit(! does_int64_work());
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}],
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[AC_MSG_RESULT(yes) AC_DEFINE(HAVE_LONG_INT_64)],
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AC_MSG_RESULT(no),
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AC_MSG_RESULT(assuming not on target machine))
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AC_MSG_CHECKING(whether 'long long int' is 64 bits)
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AC_TRY_RUN([#include <stdio.h>
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typedef long long int int64;
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#define INT64_FORMAT "%Ld"
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int64 a = 20000001;
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int64 b = 40000005;
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int does_int64_work()
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{
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int64 c,d,e;
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char buf[100];
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if (sizeof(int64) != 8)
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return 0; /* doesn't look like the right size */
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/* we do perfunctory checks on multiply, divide, sprintf, sscanf */
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c = a * b;
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sprintf(buf, INT64_FORMAT, c);
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if (strcmp(buf, "800000140000005") != 0)
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return 0; /* either multiply or sprintf is busted */
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if (sscanf(buf, INT64_FORMAT, &d) != 1)
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return 0;
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if (d != c)
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return 0;
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e = d / b;
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if (e != a)
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return 0;
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return 1;
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}
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main() {
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exit(! does_int64_work());
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}],
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[AC_MSG_RESULT(yes) AC_DEFINE(HAVE_LONG_LONG_INT_64)],
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AC_MSG_RESULT(no),
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AC_MSG_RESULT(assuming not on target machine))
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dnl Checks for library functions.
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AC_PROG_GCC_TRADITIONAL
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@ -219,6 +219,12 @@ extern void srandom(int seed);
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/* Set to 1 if your DBL_MIN is problematic */
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#undef HAVE_DBL_MIN_PROBLEM
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/* Set to 1 if type "long int" works and is 64 bits */
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#undef HAVE_LONG_INT_64
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/* Set to 1 if type "long long int" works and is 64 bits */
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#undef HAVE_LONG_LONG_INT_64
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/*
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* Code below this point should not require changes
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*/
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@ -6,7 +6,7 @@
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*
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* Copyright (c) 1994, Regents of the University of California
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*
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* $Id: int8.h,v 1.1 1998/07/08 14:10:30 thomas Exp $
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* $Id: int8.h,v 1.2 1998/08/23 22:25:54 momjian Exp $
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*
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* NOTES
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* These data types are supported on all 64-bit architectures, and may
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@ -23,29 +23,22 @@
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#ifndef INT8_H
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#define INT8_H
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#if defined(__alpha) || defined(PPC)
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#ifdef HAVE_LONG_INT_64
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/* Plain "long int" fits, use it */
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typedef long int int64;
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#define INT64_FORMAT "%ld"
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#elif defined(__GNUC__) && defined(i386)
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typedef long long int int64;
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#define INT64_FORMAT "%Ld"
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#else
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#ifdef HAVE_LONG_LONG_INT_64
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/* We have working support for "long long int", use that */
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typedef long long int int64;
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#define INT64_FORMAT "%Ld"
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#else
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/* Won't actually work, but fall back to long int so that int8.c compiles */
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typedef long int int64;
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#define INT64_FORMAT "%ld"
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#define INT64_IS_BUSTED
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#endif
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/*
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#if sizeof(int64) == 8
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#define HAVE_64BIT_INTS 1
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#endif
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*/
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extern int64 *int8in(char *str);
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extern char *int8out(int64 * val);
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