r18292: import some autoconf 2.60 specific macros,

so that older autoconf versions still work

metze
(This used to be commit 43970e6d081e56837e38856a9d05c8b9c303955e)

2 files changed, 199 insertions, 0 deletions

diff --git a/source4/lib/replace/autoconf-2.60.m4 b/source4/lib/replace/autoconf-2.60.m4
new file mode 100644
index 0000000000..5360fff5d2
--- /dev/null
+++ b/source4/lib/replace/autoconf-2.60.m4
@@ -0,0 +1,197 @@
+# _AC_C_STD_TRY(STANDARD, TEST-PROLOGUE, TEST-BODY, OPTION-LIST,
+#		ACTION-IF-AVAILABLE, ACTION-IF-UNAVAILABLE)
+# --------------------------------------------------------------
+# Check whether the C compiler accepts features of STANDARD (e.g `c89', `c99')
+# by trying to compile a program of TEST-PROLOGUE and TEST-BODY.  If this fails,
+# try again with each compiler option in the space-separated OPTION-LIST; if one
+# helps, append it to CC.  If eventually successful, run ACTION-IF-AVAILABLE,
+# else ACTION-IF-UNAVAILABLE.
+AC_DEFUN([_AC_C_STD_TRY],
+[AC_MSG_CHECKING([for $CC option to accept ISO ]m4_translit($1, [c], [C]))
+AC_CACHE_VAL(ac_cv_prog_cc_$1,
+[ac_cv_prog_cc_$1=no
+ac_save_CC=$CC
+AC_LANG_CONFTEST([AC_LANG_PROGRAM([$2], [$3])])
+for ac_arg in '' $4
+do
+  CC="$ac_save_CC $ac_arg"
+  _AC_COMPILE_IFELSE([], [ac_cv_prog_cc_$1=$ac_arg])
+  test "x$ac_cv_prog_cc_$1" != "xno" && break
+done
+rm -f conftest.$ac_ext
+CC=$ac_save_CC
+])# AC_CACHE_VAL
+case "x$ac_cv_prog_cc_$1" in
+  x)
+    AC_MSG_RESULT([none needed]) ;;
+  xno)
+    AC_MSG_RESULT([unsupported]) ;;
+  *)
+    CC="$CC $ac_cv_prog_cc_$1"
+    AC_MSG_RESULT([$ac_cv_prog_cc_$1]) ;;
+esac
+AS_IF([test "x$ac_cv_prog_cc_$1" != xno], [$5], [$6])
+])# _AC_C_STD_TRY
+
+# _AC_PROG_CC_C99 ([ACTION-IF-AVAILABLE], [ACTION-IF-UNAVAILABLE])
+# ----------------------------------------------------------------
+# If the C compiler is not in ISO C99 mode by default, try to add an
+# option to output variable CC to make it so.  This macro tries
+# various options that select ISO C99 on some system or another.  It
+# considers the compiler to be in ISO C99 mode if it handles mixed
+# code and declarations, _Bool, inline and restrict.
+AC_DEFUN([_AC_PROG_CC_C99],
+[_AC_C_STD_TRY([c99],
+[[#include <stdarg.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <wchar.h>
+#include <stdio.h>
+
+struct incomplete_array
+{
+  int datasize;
+  double data[];
+};
+
+struct named_init {
+  int number;
+  const wchar_t *name;
+  double average;
+};
+
+typedef const char *ccp;
+
+static inline int
+test_restrict(ccp restrict text)
+{
+  // See if C++-style comments work.
+  // Iterate through items via the restricted pointer.
+  // Also check for declarations in for loops.
+  for (unsigned int i = 0; *(text+i) != '\0'; ++i)
+    continue;
+  return 0;
+}
+
+// Check varargs and va_copy work.
+static void
+test_varargs(const char *format, ...)
+{
+  va_list args;
+  va_start(args, format);
+  va_list args_copy;
+  va_copy(args_copy, args);
+
+  const char *str;
+  int number;
+  float fnumber;
+
+  while (*format)
+    {
+      switch (*format++)
+	{
+	case 's': // string
+	  str = va_arg(args_copy, const char *);
+	  break;
+	case 'd': // int
+	  number = va_arg(args_copy, int);
+	  break;
+	case 'f': // float
+	  fnumber = (float) va_arg(args_copy, double);
+	  break;
+	default:
+	  break;
+	}
+    }
+  va_end(args_copy);
+  va_end(args);
+}
+]],
+[[
+  // Check bool and long long datatypes.
+  _Bool success = false;
+  long long int bignum = -1234567890LL;
+  unsigned long long int ubignum = 1234567890uLL;
+
+  // Check restrict.
+  if (test_restrict("String literal") != 0)
+    success = true;
+  char *restrict newvar = "Another string";
+
+  // Check varargs.
+  test_varargs("s, d' f .", "string", 65, 34.234);
+
+  // Check incomplete arrays work.
+  struct incomplete_array *ia =
+    malloc(sizeof(struct incomplete_array) + (sizeof(double) * 10));
+  ia->datasize = 10;
+  for (int i = 0; i < ia->datasize; ++i)
+    ia->data[i] = (double) i * 1.234;
+
+  // Check named initialisers.
+  struct named_init ni = {
+    .number = 34,
+    .name = L"Test wide string",
+    .average = 543.34343,
+  };
+
+  ni.number = 58;
+
+  int dynamic_array[ni.number];
+  dynamic_array[43] = 543;
+
+  // work around unused variable warnings
+  return  bignum == 0LL || ubignum == 0uLL || newvar[0] == 'x';
+]],
+dnl Try
+dnl GCC		-std=gnu99 (unused restrictive modes: -std=c99 -std=iso9899:1999)
+dnl AIX		-qlanglvl=extc99 (unused restrictive mode: -qlanglvl=stdc99)
+dnl Intel ICC	-c99
+dnl IRIX	-c99
+dnl Solaris	(unused because it causes the compiler to assume C99 semantics for
+dnl		library functions, and this is invalid before Solaris 10: -xc99)
+dnl Tru64	-c99
+dnl with extended modes being tried first.
+[[-std=gnu99 -c99 -qlanglvl=extc99]], [$1], [$2])[]dnl
+])# _AC_PROG_CC_C99
+
+# AC_PROG_CC_C99
+# --------------
+AC_DEFUN([AC_PROG_CC_C99],
+[ AC_REQUIRE([AC_PROG_CC])dnl
+  _AC_PROG_CC_C99
+])
+
+# AC_USE_SYSTEM_EXTENSIONS
+# ------------------------
+# Enable extensions on systems that normally disable them,
+# typically due to standards-conformance issues.
+AC_DEFUN([AC_USE_SYSTEM_EXTENSIONS],
+[
+  AC_BEFORE([$0], [AC_COMPILE_IFELSE])
+  AC_BEFORE([$0], [AC_RUN_IFELSE])
+
+  AC_REQUIRE([AC_GNU_SOURCE])
+  AC_REQUIRE([AC_AIX])
+  AC_REQUIRE([AC_MINIX])
+
+  AH_VERBATIM([__EXTENSIONS__],
+[/* Enable extensions on Solaris.  */
+#ifndef __EXTENSIONS__
+# undef __EXTENSIONS__
+#endif
+#ifndef _POSIX_PTHREAD_SEMANTICS
+# undef _POSIX_PTHREAD_SEMANTICS
+#endif])
+  AC_CACHE_CHECK([whether it is safe to define __EXTENSIONS__],
+    [ac_cv_safe_to_define___extensions__],
+    [AC_COMPILE_IFELSE(
+       [AC_LANG_PROGRAM([
+#	  define __EXTENSIONS__ 1
+	  AC_INCLUDES_DEFAULT])],
+       [ac_cv_safe_to_define___extensions__=yes],
+       [ac_cv_safe_to_define___extensions__=no])])
+  test $ac_cv_safe_to_define___extensions__ = yes &&
+    AC_DEFINE([__EXTENSIONS__])
+  AC_DEFINE([_POSIX_PTHREAD_SEMANTICS])
+])
diff --git a/source4/lib/replace/libreplace_macros.m4 b/source4/lib/replace/libreplace_macros.m4
index 03ef97d157..71ef64337b 100644
--- a/source4/lib/replace/libreplace_macros.m4
+++ b/source4/lib/replace/libreplace_macros.m4
@@ -250,3 +250,5 @@ define(AC_ADD_INCLUDE,
 [#include] $1
 EOF
 ])
+
+m4_include(autoconf-2.60.m4)