Substituted new configure test for types of accept()

Interfaced a lot of the custom tests to the config.cache, in the process
made them separate macros and grouped them out into files. Made naming
adjustments.

Removed a couple of useless/unused configure tests.

Disabled C++ by default. C++ is no more special than Perl, Python, and Tcl.
And it breaks equally often. :(

Author: petere

aclocal.m4

@@ -13,7 +13,7 @@ dnl PARTICULAR PURPOSE.
 #
 # Autoconf macros for configuring the build of Python extension modules
 #
-# $Header: /cvsroot/pgsql/aclocal.m4,v 1.1 2000/06/10 18:01:34 petere Exp $
+# $Header: /cvsroot/pgsql/aclocal.m4,v 1.2 2000/06/11 11:39:45 petere Exp $
 #
 
 # PGAC_PROG_PYTHON
@@ -61,6 +61,74 @@ else
   AC_MSG_ERROR([Python not found])
 fi])# PGAC_PATH_PYTHONDIR
 
+# Macros to detect certain C++ features
+# $Header: /cvsroot/pgsql/aclocal.m4,v 1.2 2000/06/11 11:39:45 petere Exp $
+
+
+# PGAC_CLASS_STRING
+# -----------------
+# Look for class `string'. First look for the <string> header. If this
+# is found a <string> header then it's probably safe to assume that
+# class string exists.  If not, check to make sure that <string.h>
+# defines class `string'.
+AC_DEFUN([PGAC_CLASS_STRING],
+[AC_LANG_SAVE
+AC_LANG_CPLUSPLUS
+AC_CHECK_HEADER(string,
+  [AC_DEFINE(HAVE_CXX_STRING_HEADER)])
+
+if test x"$ac_cv_header_string" != xyes ; then
+  AC_CACHE_CHECK([for class string in <string.h>],
+    [pgac_cv_class_string_in_string_h],
+    [AC_TRY_COMPILE([#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+],
+      [string foo = "test"],
+      [pgac_cv_class_string_in_string_h=yes],
+      [pgac_cv_class_string_in_string_h=no])])
+
+  if test x"$pgac_cv_class_string_in_string_h" != xyes ; then
+    AC_MSG_ERROR([neither <string> nor <string.h> seem to define the C++ class \`string\'])
+  fi
+fi
+AC_LANG_RESTORE])# PGAC_CLASS_STRING
+
+
+# PGAC_CXX_NAMESPACE_STD
+# ----------------------
+# Check whether the C++ compiler understands `using namespace std'.
+#
+# Note 1: On at least some compilers, it will not work until you've
+# included a header that mentions namespace std. Thus, include the
+# usual suspects before trying it.
+#
+# Note 2: This test does not actually reveal whether the C++ compiler
+# properly understands namespaces in all generality. (GNU C++ 2.8.1
+# is one that doesn't.) However, we don't care.
+AC_DEFUN([PGAC_CXX_NAMESPACE_STD],
+[AC_REQUIRE([PGAC_CLASS_STRING])
+AC_CACHE_CHECK([for namespace std in C++],
+pgac_cv_cxx_namespace_std,
+[
+AC_LANG_SAVE
+AC_LANG_CPLUSPLUS
+AC_TRY_COMPILE(
+[#include <stdio.h>
+#include <stdlib.h>
+#ifdef HAVE_CXX_STRING_HEADER
+#include <string>
+#endif
+using namespace std;
+], [],
+[pgac_cv_cxx_namespace_std=yes],
+[pgac_cv_cxx_namespace_std=no])
+AC_LANG_RESTORE])
+
+if test $pgac_cv_cxx_namespace_std = yes ; then
+    AC_DEFINE(HAVE_NAMESPACE_STD, 1, [Define to 1 if the C++ compiler understands `using namespace std'])
+fi])# PGAC_CXX_NAMESPACE_STD
+
 dnl AM_MISSING_PROG(NAME, PROGRAM, DIRECTORY)
 dnl The program must properly implement --version.
 AC_DEFUN(AM_MISSING_PROG,
@@ -77,3 +145,270 @@ else
 fi
 AC_SUBST($1)])
 
+# Macros to detect C compiler features
+# $Header: /cvsroot/pgsql/aclocal.m4,v 1.2 2000/06/11 11:39:45 petere Exp $
+
+
+# PGAC_C_SIGNED
+# -------------
+# Check if the C compiler understands signed types.
+# (Of course any ISO C compiler should, what is this still doing here?)
+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
+
+# $Header: /cvsroot/pgsql/aclocal.m4,v 1.2 2000/06/11 11:39:45 petere Exp $
+# This comes from the official Autoconf macro archive at
+# <http://research.cys.de/autoconf-archive/>
+# (I removed the $ before the Id CVS keyword below.)
+
+
+dnl @synopsis AC_FUNC_ACCEPT_ARGTYPES
+dnl
+dnl Checks the data types of the three arguments to accept(). Results are
+dnl placed into the symbols ACCEPT_TYPE_ARG[123], consistent with the
+dnl following example:
+dnl
+dnl       #define ACCEPT_TYPE_ARG1 int
+dnl       #define ACCEPT_TYPE_ARG2 struct sockaddr *
+dnl       #define ACCEPT_TYPE_ARG3 socklen_t
+dnl
+dnl This macro requires AC_CHECK_HEADERS to have already verified the
+dnl presence or absence of sys/types.h and sys/socket.h.
+dnl
+dnl NOTE: This is just a modified version of the AC_FUNC_SELECT_ARGTYPES
+dnl macro. Credit for that one goes to David MacKenzie et. al.
+dnl
+dnl @version Id: ac_func_accept_argtypes.m4,v 1.1 1999/12/03 11:29:29 simons Exp $
+dnl @author Daniel Richard G. <skunk@mit.edu>
+dnl
+
+# PostgreSQL local changes: In the original version ACCEPT_TYPE_ARG3
+# is a pointer type. That's kind of useless because then you can't
+# use the macro to define a corresponding variable. We also make the
+# reasonable(?) assumption that you can use arg3 for getsocktype etc.
+# as well (i.e., anywhere POSIX.2 has socklen_t).
+
+AC_DEFUN(AC_FUNC_ACCEPT_ARGTYPES,
+[AC_MSG_CHECKING([types of arguments for accept()])
+ AC_CACHE_VAL(ac_cv_func_accept_arg1,dnl
+ [AC_CACHE_VAL(ac_cv_func_accept_arg2,dnl
+  [AC_CACHE_VAL(ac_cv_func_accept_arg3,dnl
+   [for ac_cv_func_accept_arg1 in 'int' 'unsigned int'; do
+     for ac_cv_func_accept_arg2 in 'struct sockaddr *' 'void *'; do
+      for ac_cv_func_accept_arg3 in 'socklen_t' 'size_t' 'unsigned int' 'int'; do
+       AC_TRY_COMPILE(dnl
+[#ifdef HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+#ifdef HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
+extern accept ($ac_cv_func_accept_arg1, $ac_cv_func_accept_arg2, $ac_cv_func_accept_arg3 *);],,dnl
+        [ac_not_found=no ; break 3], ac_not_found=yes)
+      done
+     done
+    done
+   ])dnl AC_CACHE_VAL
+  ])dnl AC_CACHE_VAL
+ ])dnl AC_CACHE_VAL
+ if test "$ac_not_found" = yes; then
+  ac_cv_func_accept_arg1=int
+  ac_cv_func_accept_arg2='struct sockaddr *'
+  ac_cv_func_accept_arg3='socklen_t'
+ fi
+ AC_MSG_RESULT([$ac_cv_func_accept_arg1, $ac_cv_func_accept_arg2, $ac_cv_func_accept_arg3 *])
+ AC_DEFINE_UNQUOTED(ACCEPT_TYPE_ARG1,$ac_cv_func_accept_arg1)
+ AC_DEFINE_UNQUOTED(ACCEPT_TYPE_ARG2,$ac_cv_func_accept_arg2)
+ AC_DEFINE_UNQUOTED(ACCEPT_TYPE_ARG3,$ac_cv_func_accept_arg3)
+])
+
+# Macros that test various C library quirks
+# $Header: /cvsroot/pgsql/aclocal.m4,v 1.2 2000/06/11 11:39:45 petere Exp $
+
+
+# PGAC_VAR_INT_TIMEZONE
+# ---------------------
+# Check if the global variable `timezone' exists. If so, define
+# HAVE_INT_TIMEZONE.
+AC_DEFUN([PGAC_VAR_INT_TIMEZONE],
+[AC_CACHE_CHECK(for int timezone, pgac_cv_var_int_timezone,
+[AC_TRY_LINK([#include <time.h>],
+  [int res = timezone / 60;],
+  [pgac_cv_var_int_timezone=yes],
+  [pgac_cv_var_int_timezone=no])])
+if test x"$pgac_cv_var_int_timezone" = xyes ; then
+  AC_DEFINE(HAVE_INT_TIMEZONE,, [Set to 1 if you have the global variable timezone])
+fi])# PGAC_VAR_INT_TIMEZONE
+
+
+# PGAC_FUNC_GETTIMEOFDAY_1ARG
+# ---------------------------
+# Check if gettimeofday() has only one arguments. (Normal is two.)
+# If so, define GETTIMEOFDAY_1ARG.
+AC_DEFUN([PGAC_FUNC_GETTIMEOFDAY_1ARG],
+[AC_CACHE_CHECK(whether gettimeofday takes only one argument,
+pgac_cv_func_gettimeofday_1arg,
+[AC_TRY_COMPILE([#include <sys/time.h>],
+[struct timeval *tp;
+struct timezone *tzp;
+gettimeofday(tp,tzp);],
+[pgac_cv_func_gettimeofday_1arg=no],
+[pgac_cv_func_gettimeofday_1arg=yes])])
+if test x"$pgac_cv_func_gettimeofday_1arg" = xyes ; then
+  AC_DEFINE(GETTIMEOFDAY_1ARG,, [Set to 1 if gettimeofday() takes only 1 argument])
+fi])# PGAC_FUNC_GETTIMEOFDAY_1ARG
+
+
+# PGAC_UNION_SEMUN
+# ----------------
+# Check if `union semun' exists. Define HAVE_UNION_SEMUN if so.
+# If it doesn't then one could define it as
+# union semun { int val; struct semid_ds *buf; unsigned short *array; }
+AC_DEFUN([PGAC_UNION_SEMUN],
+[AC_CACHE_CHECK(for union semun, pgac_cv_union_semun,
+[AC_TRY_COMPILE([#include <sys/types.h>
+#include <sys/ipc.h>
+#include <sys/sem.h>],
+  [union semun semun;],
+  [pgac_cv_union_semun=yes],
+  [pgac_cv_union_semun=no])])
+if test x"$pgac_cv_union_semun" = xyes ; then
+  AC_DEFINE(HAVE_UNION_SEMUN,, [Set to 1 if you have `union semun'])
+fi])# PGAC_UNION_SEMUN
+
+
+# PGAC_FUNC_POSIX_SIGNALS
+# -----------------------
+# Check to see if the machine has the POSIX signal interface. Define
+# HAVE_POSIX_SIGNALS if so. Also set the output variable HAVE_POSIX_SIGNALS
+# to yes or no.
+#
+# Note that this test only compiles a test program, it doesn't check
+# whether the routines actually work. If that becomes a problem, make
+# a fancier check.
+AC_DEFUN([PGAC_FUNC_POSIX_SIGNALS],
+[AC_CACHE_CHECK(for POSIX signal interface, pgac_cv_func_posix_signals,
+[AC_TRY_LINK([#include <signal.h>
+],
+[struct sigaction act, oact;
+sigemptyset(&act.sa_mask);
+act.sa_flags = SA_RESTART;
+sigaction(0, &act, &oact);],
+[pgac_cv_func_posix_signals=yes],
+[pgac_cv_func_posix_signals=no])])
+if test x"$pgac_cv_func_posix_signals" = xyes ; then
+  AC_DEFINE(HAVE_POSIX_SIGNALS,, [Set to 1 if you have the POSIX signal interface])
+fi
+HAVE_POSIX_SIGNALS=$pgac_cv_func_posix_signals
+AC_SUBST(HAVE_POSIX_SIGNALS)])# PGAC_FUNC_POSIX_SIGNALS
+