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Factor out the code that detects the long long int snprintf format into a

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separate macro.  Also add support for %I64d which is the way on Windows.

The code that checks for the 64-bit int type now gives more reasonable
results when cross-compiling: In that case we just take the compiler's
information and trust that the arithmetic works.  Disabling int64 is too
pessimistic.
This commit is contained in:
Peter Eisentraut
2003-01-28 21:57:12 +00:00
parent c0276244b1
commit 955a1f81a7
4 changed files with 190 additions and 178 deletions
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97
configure.in
View File

@@ -1,5 +1,5 @@
dnl Process this file with autoconf to produce a configure script.
dnl $Header: /cvsroot/pgsql/configure.in,v 1.233 2003/01/25 05:19:45 tgl Exp $
dnl $Header: /cvsroot/pgsql/configure.in,v 1.234 2003/01/28 21:57:11 petere Exp $
dnl
dnl Developers, please strive to achieve this order:
dnl
@@ -970,90 +970,25 @@ long long int foo = INT64CONST(0x1234567890123456);
fi
dnl If we found "long int" is 64 bits, assume snprintf handles it.
dnl If we found we need to use "long long int", better check.
dnl We cope with snprintfs that use either %lld or %qd as the format.
dnl If neither works, fall back to our own snprintf emulation (which we
dnl know uses %lld).
# If we found "long int" is 64 bits, assume snprintf handles it. If
# we found we need to use "long long int", better check. We cope with
# snprintfs that use either %lld, %qd, or %I64d as the format. If
# neither works, fall back to our own snprintf emulation (which we
# know uses %lld).
if test x"$HAVE_LONG_LONG_INT_64" = xyes ; then
if test "$HAVE_LONG_LONG_INT_64" = yes ; then
if test $pgac_need_repl_snprintf = no; then
AC_MSG_CHECKING(whether snprintf handles 'long long int' as %lld)
AC_TRY_RUN([#include <stdio.h>
typedef long long int int64;
#define INT64_FORMAT "%lld"
int64 a = 20000001;
int64 b = 40000005;
int does_int64_snprintf_work()
{
int64 c;
char buf[100];
if (sizeof(int64) != 8)
return 0; /* doesn't look like the right size */
c = a * b;
snprintf(buf, 100, INT64_FORMAT, c);
if (strcmp(buf, "800000140000005") != 0)
return 0; /* either multiply or snprintf is busted */
return 1;
}
main() {
exit(! does_int64_snprintf_work());
}],
[ AC_MSG_RESULT(yes)
INT64_FORMAT='"%lld"'
],
[ AC_MSG_RESULT(no)
AC_MSG_CHECKING(whether snprintf handles 'long long int' as %qd)
AC_TRY_RUN([#include <stdio.h>
typedef long long int int64;
#define INT64_FORMAT "%qd"
int64 a = 20000001;
int64 b = 40000005;
int does_int64_snprintf_work()
{
int64 c;
char buf[100];
if (sizeof(int64) != 8)
return 0; /* doesn't look like the right size */
c = a * b;
snprintf(buf, 100, INT64_FORMAT, c);
if (strcmp(buf, "800000140000005") != 0)
return 0; /* either multiply or snprintf is busted */
return 1;
}
main() {
exit(! does_int64_snprintf_work());
}],
[ AC_MSG_RESULT(yes)
INT64_FORMAT='"%qd"'
],
[ AC_MSG_RESULT(no)
# Force usage of our own snprintf, since system snprintf is broken
pgac_need_repl_snprintf=yes
INT64_FORMAT='"%lld"'
],
[ AC_MSG_RESULT([cannot test (not on host machine)])
# Force usage of our own snprintf, since we cannot test foreign snprintf
pgac_need_repl_snprintf=yes
INT64_FORMAT='"%lld"'
]) ],
[ AC_MSG_RESULT([cannot test (not on host machine)])
# Force usage of our own snprintf, since we cannot test foreign snprintf
pgac_need_repl_snprintf=yes
INT64_FORMAT='"%lld"'
])
PGAC_FUNC_SNPRINTF_LONG_LONG_INT_FORMAT
if test "$LONG_LONG_INT_FORMAT" = ""; then
# Force usage of our own snprintf, since system snprintf is broken
pgac_need_repl_snprintf=yes
LONG_LONG_INT_FORMAT='%lld'
fi
else
# here if we previously decided we needed to use our own snprintf
INT64_FORMAT='"%lld"'
# Here if we previously decided we needed to use our own snprintf
LONG_LONG_INT_FORMAT='%lld'
fi
INT64_FORMAT="\"$LONG_LONG_INT_FORMAT\""
else
# Here if we are not using 'long long int' at all
INT64_FORMAT='"%ld"'