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Cleaner autoconf tests for int8 support.

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This commit is contained in:
Tom Lane
1999-03-07 21:32:06 +00:00
parent a564d2bf0f
commit dffb88b024
2 changed files with 262 additions and 176 deletions
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107
src/configure.in
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@@ -631,6 +631,9 @@ AC_CHECK_FUNCS(fp_class fp_class_d class)
AC_CHECK_FUNCS(sigprocmask waitpid setsid fcvt)
dnl We use our snprintf.c emulation if either snprintf() or vsnprintf()
dnl is missing. Yes, there are machines that have only one.
dnl We may also decide to use snprintf.c if snprintf() is present but does
dnl not have working "long long int" support -- see below.
SNPRINTF=''
AC_CHECK_FUNC(snprintf,
AC_DEFINE(HAVE_SNPRINTF),
SNPRINTF='snprintf.o')
@@ -701,38 +704,37 @@ fi
AC_SUBST(HPUXMATHLIB)
dnl Check to see if we have a working 64-bit integer type.
dnl This has to be done after checking for snprintf, because
dnl if the platform has snprintf then we need to know if snprintf
dnl works with 64-bit ints. However, if we are supplying our own
dnl snprintf then we expect that it will work as long as the basic
dnl 64-bit math operations work. NOTE that we will supply our own
dnl snprintf if either snprintf or vsnprintf is missing.
dnl This breaks down into two steps:
dnl (1) figure out if the compiler has a 64-bit int type with working
dnl arithmetic, and if so
dnl (2) see whether snprintf() can format the type correctly. (Currently,
dnl snprintf is the only library routine we really need for int8 support.)
dnl It's entirely possible to have a compiler that handles a 64-bit type
dnl when the C library doesn't; this is fairly likely when using gcc on
dnl an older platform, for example.
dnl If there is no native snprintf() or it does not handle the 64-bit type,
dnl we force our own version of snprintf() to be used instead.
dnl Note this test must be run after our initial check for snprintf/vsnprintf.
HAVE_LONG_INT_64=0
AC_MSG_CHECKING(whether 'long int' is 64 bits)
AC_TRY_RUN([#include <stdio.h>
typedef long int int64;
#define INT64_FORMAT "%ld"
AC_TRY_RUN([typedef long int int64;
/* These are globals to discourage the compiler from folding all the
* arithmetic tests down to compile-time constants.
*/
int64 a = 20000001;
int64 b = 40000005;
int does_int64_work()
{
int64 c,d;
char buf[100];
if (sizeof(int64) != 8)
return 0; /* doesn't look like the right size */
/* we do perfunctory checks on multiply and divide,
* and also test snprintf if the platform provides snprintf.
*/
/* Do perfunctory checks to see if 64-bit arithmetic seems to work */
c = a * b;
#if defined(HAVE_SNPRINTF) && defined(HAVE_VSNPRINTF)
snprintf(buf, 100, INT64_FORMAT, c);
if (strcmp(buf, "800000140000005") != 0)
return 0; /* either multiply or snprintf is busted */
#endif
d = (c + b) / b;
if (d != a+1)
return 0;
@@ -741,46 +743,83 @@ int does_int64_work()
main() {
exit(! does_int64_work());
}],
[AC_DEFINE(HAVE_LONG_INT_64) AC_MSG_RESULT(yes)],
[HAVE_LONG_INT_64=1
AC_DEFINE(HAVE_LONG_INT_64)
AC_MSG_RESULT(yes)],
AC_MSG_RESULT(no),
AC_MSG_RESULT(assuming not on target machine))
HAVE_LONG_LONG_INT_64=0
if [[ $HAVE_LONG_INT_64 -eq 0 ]] ; then
AC_MSG_CHECKING(whether 'long long int' is 64 bits)
AC_TRY_RUN([#include <stdio.h>
AC_TRY_RUN([typedef long long int int64;
/* These are globals to discourage the compiler from folding all the
* arithmetic tests down to compile-time constants.
*/
int64 a = 20000001;
int64 b = 40000005;
int does_int64_work()
{
int64 c,d;
if (sizeof(int64) != 8)
return 0; /* doesn't look like the right size */
/* Do perfunctory checks to see if 64-bit arithmetic seems to work */
c = a * b;
d = (c + b) / b;
if (d != a+1)
return 0;
return 1;
}
main() {
exit(! does_int64_work());
}],
[HAVE_LONG_LONG_INT_64=1
AC_DEFINE(HAVE_LONG_LONG_INT_64)
AC_MSG_RESULT(yes)],
AC_MSG_RESULT(no),
AC_MSG_RESULT(assuming not on target machine))
fi
dnl If we found "long int" is 64 bits, assume snprintf handles it.
dnl If we found we need to use "long long int", better check.
if [[ x$SNPRINTF = x -a $HAVE_LONG_LONG_INT_64 -eq 1 ]] ; then
AC_MSG_CHECKING(whether snprintf handles 'long long int')
AC_TRY_RUN([#include <stdio.h>
typedef long long int int64;
#define INT64_FORMAT "%lld"
int64 a = 20000001;
int64 b = 40000005;
int does_int64_work()
int does_int64_snprintf_work()
{
int64 c,d;
int64 c;
char buf[100];
if (sizeof(int64) != 8)
return 0; /* doesn't look like the right size */
/* we do perfunctory checks on multiply and divide,
* and also test snprintf if the platform provides snprintf.
*/
c = a * b;
#if defined(HAVE_SNPRINTF) && defined(HAVE_VSNPRINTF)
snprintf(buf, 100, INT64_FORMAT, c);
if (strcmp(buf, "800000140000005") != 0)
return 0; /* either multiply or snprintf is busted */
#endif
d = (c + b) / b;
if (d != a+1)
return 0;
return 1;
}
main() {
exit(! does_int64_work());
exit(! does_int64_snprintf_work());
}],
[AC_DEFINE(HAVE_LONG_LONG_INT_64) AC_MSG_RESULT(yes)],
AC_MSG_RESULT(no),
AC_MSG_RESULT(assuming not on target machine))
AC_MSG_RESULT(yes),
[SNPRINTF='snprintf.o'
AC_MSG_RESULT(no)],
[SNPRINTF='snprintf.o'
AC_MSG_RESULT(assuming not on target machine)])
fi
dnl Check to see if platform has POSIX signal interface.
dnl NOTE: if this test fails then POSIX signals definitely don't work.