mirror of
https://git.postgresql.org/git/postgresql.git
synced 2024-12-27 08:39:28 +08:00
120 lines
3.4 KiB
Plaintext
120 lines
3.4 KiB
Plaintext
# Macros to detect C compiler features
|
|
# $Header: /cvsroot/pgsql/config/c-compiler.m4,v 1.3 2000/08/29 09:36:37 petere Exp $
|
|
|
|
|
|
# PGAC_C_SIGNED
|
|
# -------------
|
|
# Check if the C compiler understands signed types.
|
|
AC_DEFUN([PGAC_C_SIGNED],
|
|
[AC_CACHE_CHECK(for signed types, pgac_cv_c_signed,
|
|
[AC_TRY_COMPILE([],
|
|
[signed char c; signed short s; signed int i;],
|
|
[pgac_cv_c_signed=yes],
|
|
[pgac_cv_c_signed=no])])
|
|
if test x"$pgac_cv_c_signed" = xno ; then
|
|
AC_DEFINE(signed,, [Define empty if the C compiler does not understand signed types])
|
|
fi])# PGAC_C_SIGNED
|
|
|
|
|
|
|
|
# PGAC_C_VOLATILE
|
|
# ---------------
|
|
# Check if the C compiler understands `volatile'. Note that if it doesn't
|
|
# then this will potentially break the program semantics.
|
|
AC_DEFUN([PGAC_C_VOLATILE],
|
|
[AC_CACHE_CHECK(for volatile, pgac_cv_c_volatile,
|
|
[AC_TRY_COMPILE([],
|
|
[extern volatile int i;],
|
|
[pgac_cv_c_volatile=yes],
|
|
[pgac_cv_c_volatile=no])])
|
|
if test x"$pgac_cv_c_volatile" = xno ; then
|
|
AC_DEFINE(volatile,, [Define empty if the C compiler does not understand `volatile'])
|
|
fi])# PGAC_C_VOLATILE
|
|
|
|
|
|
|
|
# PGAC_TYPE_64BIT_INT(TYPE)
|
|
# -------------------------
|
|
# Check if TYPE is a working 64 bit integer type. Set HAVE_TYPE_64 to
|
|
# yes or no respectively, and define HAVE_TYPE_64 if yes.
|
|
AC_DEFUN([PGAC_TYPE_64BIT_INT],
|
|
[define([Ac_define], [translit([have_$1_64], [a-z *], [A-Z_P])])dnl
|
|
define([Ac_cachevar], [translit([pgac_cv_type_$1_64], [ *], [_p])])dnl
|
|
AC_CACHE_CHECK([whether $1 is 64 bits], [Ac_cachevar],
|
|
[AC_TRY_RUN(
|
|
[typedef $1 int64;
|
|
|
|
/*
|
|
* These are globals to discourage the compiler from folding all the
|
|
* arithmetic tests down to compile-time constants.
|
|
*/
|
|
int64 a = 20000001;
|
|
int64 b = 40000005;
|
|
|
|
int does_int64_work()
|
|
{
|
|
int64 c,d;
|
|
|
|
if (sizeof(int64) != 8)
|
|
return 0; /* definitely not the right size */
|
|
|
|
/* Do perfunctory checks to see if 64-bit arithmetic seems to work */
|
|
c = a * b;
|
|
d = (c + b) / b;
|
|
if (d != a+1)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
main() {
|
|
exit(! does_int64_work());
|
|
}],
|
|
[Ac_cachevar=yes],
|
|
[Ac_cachevar=no],
|
|
[Ac_cachevar=no
|
|
dnl We will do better here with Autoconf 2.50
|
|
AC_MSG_WARN([64 bit arithmetic disabled when cross-compiling])])])
|
|
|
|
Ac_define=$Ac_cachevar
|
|
if test x"$Ac_cachevar" = xyes ; then
|
|
AC_DEFINE(Ac_define,, [Set to 1 if `]$1[' is 64 bits])
|
|
fi
|
|
undefine([Ac_define])dnl
|
|
undefine([Ac_cachevar])dnl
|
|
])# PGAC_TYPE_64BIT_INT
|
|
|
|
|
|
|
|
# PGAC_CHECK_ALIGNOF(TYPE)
|
|
# ------------------------
|
|
# Find the alignment requirement of the given type. Define the result
|
|
# as ALIGNOF_TYPE. If cross-compiling, sizeof(type) is used as a
|
|
# default assumption.
|
|
#
|
|
# This is modeled on the standard autoconf macro AC_CHECK_SIZEOF.
|
|
# That macro never got any points for style.
|
|
AC_DEFUN([PGAC_CHECK_ALIGNOF],
|
|
[changequote(<<, >>)dnl
|
|
dnl The name to #define.
|
|
define(<<AC_TYPE_NAME>>, translit(alignof_$1, [a-z *], [A-Z_P]))dnl
|
|
dnl The cache variable name.
|
|
define(<<AC_CV_NAME>>, translit(pgac_cv_alignof_$1, [ *], [_p]))dnl
|
|
changequote([, ])dnl
|
|
AC_MSG_CHECKING(alignment of $1)
|
|
AC_CACHE_VAL(AC_CV_NAME,
|
|
[AC_TRY_RUN([#include <stdio.h>
|
|
struct { char filler; $1 field; } mystruct;
|
|
main()
|
|
{
|
|
FILE *f=fopen("conftestval", "w");
|
|
if (!f) exit(1);
|
|
fprintf(f, "%d\n", ((char*) & mystruct.field) - ((char*) & mystruct));
|
|
exit(0);
|
|
}], AC_CV_NAME=`cat conftestval`,
|
|
AC_CV_NAME='sizeof($1)',
|
|
AC_CV_NAME='sizeof($1)')])dnl
|
|
AC_MSG_RESULT($AC_CV_NAME)
|
|
AC_DEFINE_UNQUOTED(AC_TYPE_NAME, $AC_CV_NAME, [The alignment requirement of a `]$1['])
|
|
undefine([AC_TYPE_NAME])dnl
|
|
undefine([AC_CV_NAME])dnl
|
|
])# PGAC_CHECK_ALIGNOF
|