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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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50
config/c-library.m4
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@ -1,5 +1,5 @@
# Macros that test various C library quirks
# $Header: /cvsroot/pgsql/config/c-library.m4,v 1.14 2002/07/27 20:10:03 petere Exp $
# $Header: /cvsroot/pgsql/config/c-library.m4,v 1.15 2003/01/28 21:57:12 petere Exp $
# PGAC_VAR_INT_TIMEZONE
@ -86,3 +86,51 @@ if test x"$pgac_cv_func_posix_signals" = xyes ; then
fi
HAVE_POSIX_SIGNALS=$pgac_cv_func_posix_signals
AC_SUBST(HAVE_POSIX_SIGNALS)])# PGAC_FUNC_POSIX_SIGNALS
# PGAC_FUNC_SNPRINTF_LONG_LONG_INT_FORMAT
# ---------------------------------------
# Determine which format snprintf uses for long long int. We handle
# %lld, %qd, %I64d. The result is in shell variable
# LONG_LONG_INT_FORMAT.
AC_DEFUN([PGAC_FUNC_SNPRINTF_LONG_LONG_INT_FORMAT],
[AC_MSG_CHECKING([snprintf format for long long int])
AC_CACHE_VAL(pgac_cv_snprintf_long_long_int_format,
[for pgac_format in '%lld' '%qd' '%I64d'; do
AC_TRY_RUN([#include <stdio.h>
typedef long long int int64;
#define INT64_FORMAT "$pgac_format"
int64 a = 20000001;
int64 b = 40000005;
int does_int64_snprintf_work()
{
int64 c;
char buf[100];
if (sizeof(int64) != 8)
return 0; /* doesn't look like the right size */
c = a * b;
snprintf(buf, 100, INT64_FORMAT, c);
if (strcmp(buf, "800000140000005") != 0)
return 0; /* either multiply or snprintf is busted */
return 1;
}
main() {
exit(! does_int64_snprintf_work());
}],
[pgac_cv_snprintf_long_long_int_format=$pgac_format; break],
[],
[pgac_cv_snprintf_long_long_int_format=cross; break])
done])dnl AC_CACHE_VAL
LONG_LONG_INT_FORMAT=''
case $pgac_cv_snprintf_long_long_int_format in
cross) AC_MSG_RESULT([cannot test (not on host machine)]);;
?*) AC_MSG_RESULT([$pgac_cv_snprintf_long_long_int_format])
LONG_LONG_INT_FORMAT=$pgac_cv_snprintf_long_long_int_format;;
*) AC_MSG_RESULT(none);;
esac])# PGAC_FUNC_SNPRINTF_LONG_LONG_INT_FORMAT