Adds DAHDI support alongside Zaptel. DAHDI usage favored, but all Zap stuff should continue working. Release announcement to follow.

git-svn-id: http://svn.digium.com/svn/asterisk/branches/1.4@122314 f38db490-d61c-443f-a65b-d21fe96a405b

1 files changed, 48 insertions, 0 deletions

diff --git a/acinclude.m4 b/acinclude.m4
index 0fa4e546e..106688b69 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -101,6 +101,54 @@ if test "${USE_$1}" != "no"; then
 fi
 ])
 
+# The next three functions check for the availability of a given package.
+# AST_C_DEFINE_CHECK looks for the presence of a #define in a header file,
+# AST_C_COMPILE_CHECK can be used for testing for various items in header files,
+# AST_EXT_LIB_CHECK looks for a symbol in a given library, or at least
+#   for the presence of a header file.
+# AST_EXT_TOOL_CHECK looks for a symbol in using $1-config to determine CFLAGS and LIBS
+#
+# They are only run if PBX_$1 != 1 (where $1 is the package),
+# so you can call them multiple times and stop at the first matching one.
+# On success, they both set PBX_$1 = 1, set $1_INCLUDE and $1_LIB as applicable,
+# and also #define HAVE_$1 1 and #define HAVE_$1_VERSION ${last_argument}
+# in autoconfig.h so you can tell which test succeeded.
+# They should be called after AST_EXT_LIB_SETUP($1, ...)
+
+# Check if a given macro is defined in a certain header.
+
+# AST_C_DEFINE_CHECK([package], [macro name], [header file], [version])
+AC_DEFUN([AST_C_DEFINE_CHECK],
+[
+    if test "x${PBX_$1}" != "x1"; then
+    AC_MSG_CHECKING([for $2 in $3])
+    saved_cppflags="${CPPFLAGS}"
+    if test "x${$1_DIR}" != "x"; then
+        $1_INCLUDE="-I${$1_DIR}/include"
+    fi
+    CPPFLAGS="${CPPFLAGS} ${$1_INCLUDE}"
+
+    AC_COMPILE_IFELSE(
+        [ AC_LANG_PROGRAM( [#include <$3>],
+                   [#if defined($2)
+                int foo = 0;
+                    #else
+                    int foo = bar;
+                    #endif
+                0
+                   ])],
+        [   AC_MSG_RESULT(yes)
+        PBX_$1=1
+        AC_DEFINE([HAVE_$1], 1, [Define if your system has the $1 headers.])
+        AC_DEFINE([HAVE_$1_VERSION], $4, [Define $1 headers version])
+        ],
+        [   AC_MSG_RESULT(no) ] 
+    )
+    CPPFLAGS="${saved_cppflags}"
+    fi
+    AC_SUBST(PBX_$1)
+])
+
 # AST_C_COMPILE_CHECK can be used for testing for various items in header files
 
 # AST_C_COMPILE_CHECK([package], [expression], [header file], [version])