build: split acinclude.m4 into m4/*

ax_emptyarray.m4  ax_openvpn_lib.m4  ax_socklen_t.m4  ax_varargs.m4

Signed-off-by: Alon Bar-Lev <alon.barlev@gmail.com>
Acked-by: Adriaan de Jong <dejong@fox-it.com>
Signed-off-by: David Sommerseth <davids@redhat.com>

Makefile.am

@@ -28,6 +28,7 @@ LDADD = @LIBOBJS@
 # This option prevents autoreconf from overriding our COPYING and
 # INSTALL targets:
 AUTOMAKE_OPTIONS = foreign
+ACLOCAL_AMFLAGS = -I m4
 
 MAINTAINERCLEANFILES = \
 	config.log config.status \

configure.ac

@@ -32,6 +32,7 @@ AC_CONFIG_SRCDIR(syshead.h)
 
 dnl Guess host type.
 AC_CANONICAL_HOST
+AC_CONFIG_MACRO_DIR([m4])
 AM_INIT_AUTOMAKE(openvpn, [$PACKAGE_VERSION])
 
 AC_ARG_WITH(cygwin-native,

m4/ax_emptyarray.m4

@@ -0,0 +1,27 @@
+dnl @synopsis AX_EMPTY_ARRAY
+dnl
+dnl Define EMPTY_ARRAY_SIZE to be either "0"
+dnl or "" depending on which syntax the compiler
+dnl prefers for empty arrays in structs.
+dnl
+dnl @version
+dnl @author James Yonan <jim@yonan.net>
+AC_DEFUN([AX_EMPTY_ARRAY], [
+  AC_MSG_RESULT([checking for C compiler empty array support])
+  AC_COMPILE_IFELSE([AC_LANG_SOURCE(
+    [
+        struct { int foo; int bar[[0]]; } mystruct;
+    ])], [
+        AC_DEFINE_UNQUOTED(EMPTY_ARRAY_SIZE, 0, [Dimension to use for empty array declaration])
+    ], [
+        AC_COMPILE_IFELSE([AC_LANG_SOURCE(
+	    [
+	        struct { int foo; int bar[[]]; } mystruct;
+	    ])], [
+                AC_DEFINE_UNQUOTED(EMPTY_ARRAY_SIZE,, [Dimension to use for empty array declaration])
+	    ], [
+	        AC_MSG_ERROR([C compiler is unable to creaty empty arrays])
+	    ])
+    ])
+  ]
+)

m4/ax_openvpn_lib.m4

@@ -0,0 +1,4 @@
+dnl OPENVPN_ADD_LIBS(LIB)
+AC_DEFUN([OPENVPN_ADD_LIBS], [
+  LIBS="$1 $LIBS"
+])

m4/ax_socklen_t.m4

@@ -0,0 +1,50 @@
+dnl -- The following is taken from curl's acinclude.m4 --
+dnl Check for socklen_t: historically on BSD it is an int, and in
+dnl POSIX 1g it is a type of its own, but some platforms use different
+dnl types for the argument to getsockopt, getpeername, etc.  So we
+dnl have to test to find something that will work.
+AC_DEFUN([TYPE_SOCKLEN_T],
+[
+   AC_CHECK_TYPE([socklen_t], ,[
+      AC_MSG_CHECKING([for socklen_t equivalent])
+      AC_CACHE_VAL([curl_cv_socklen_t_equiv],
+      [
+         case "$host" in
+	 *-mingw*) curl_cv_socklen_t_equiv=int ;;
+	 *)
+            # Systems have either "struct sockaddr *" or
+            # "void *" as the second argument to getpeername
+            curl_cv_socklen_t_equiv=
+            for arg2 in "struct sockaddr" void; do
+               for t in int size_t unsigned long "unsigned long"; do
+                  AC_TRY_COMPILE([
+                     #include <sys/types.h>
+                     #include <sys/socket.h>
+
+                     int getpeername (int, $arg2 *, $t *);
+                  ],[
+                     $t len;
+                     getpeername(0,0,&len);
+                  ],[
+                     curl_cv_socklen_t_equiv="$t"
+                     break
+                  ])
+               done
+            done
+	 ;;
+	 esac
+
+         if test "x$curl_cv_socklen_t_equiv" = x; then
+            AC_MSG_ERROR([Cannot find a type to use in place of socklen_t])
+         fi
+      ])
+      AC_MSG_RESULT($curl_cv_socklen_t_equiv)
+      AC_DEFINE_UNQUOTED(socklen_t, $curl_cv_socklen_t_equiv,
+			[type to use in place of socklen_t if not defined])],
+      [#include <sys/types.h>
+#ifdef WIN32
+#include <ws2tcpip.h>
+#else
+#include <sys/socket.h>
+#endif])
+])

m4/ax_varargs.m4

@@ -0,0 +1,43 @@
+dnl @synopsis AX_CPP_VARARG_MACRO_GCC
+dnl
+dnl Test if the preprocessor understands GNU GCC-style vararg macros.
+dnl If it does, defines HAVE_CPP_VARARG_MACRO_GCC to 1.
+dnl
+dnl @version
+dnl @author James Yonan <jim@yonan.net>, Matthias Andree <matthias.andree@web.de>
+AC_DEFUN([AX_CPP_VARARG_MACRO_GCC], [dnl
+    AS_VAR_PUSHDEF([VAR],[ax_cv_cpp_vararg_macro_gcc])dnl
+    AC_CACHE_CHECK([for GNU GCC vararg macro support], VAR, [dnl
+      AC_COMPILE_IFELSE([AC_LANG_SOURCE([
+	#define macro(a, b...) func(a, b)
+	int func(int a, int b, int c);
+	int test() { return macro(1, 2, 3); }
+	])], [ VAR=yes ], [VAR=no])])
+    if test $VAR = yes ; then
+    AC_DEFINE([HAVE_CPP_VARARG_MACRO_GCC], 1,
+      [Define to 1 if your compiler supports GNU GCC-style variadic macros])
+    fi
+    AS_VAR_POPDEF([VAR])dnl
+])
+
+dnl @synopsis AX_CPP_VARARG_MACRO_ISO
+dnl
+dnl Test if the preprocessor understands ISO C 1999 vararg macros.
+dnl If it does, defines HAVE_CPP_VARARG_MACRO_ISO to 1.
+dnl
+dnl @version
+dnl @author James Yonan <jim@yonan.net>, Matthias Andree <matthias.andree@web.de>
+AC_DEFUN([AX_CPP_VARARG_MACRO_ISO], [dnl
+    AS_VAR_PUSHDEF([VAR],[ax_cv_cpp_vararg_macro_iso])dnl
+    AC_CACHE_CHECK([for ISO C 1999 vararg macro support], VAR, [dnl
+      AC_COMPILE_IFELSE([AC_LANG_SOURCE([
+#define macro(a, ...) func(a, __VA_ARGS__)
+	int func(int a, int b, int c);
+	int test() { return macro(1, 2, 3); }
+	])], [ VAR=yes ], [VAR=no])])
+    if test $VAR = yes ; then
+    AC_DEFINE([HAVE_CPP_VARARG_MACRO_ISO], 1,
+      [Define to 1 if your compiler supports ISO C99 variadic macros])
+    fi
+    AS_VAR_POPDEF([VAR])dnl
+])