Use autoconf/automake to configure and make ppp

[ppp.git] / m4 / ax_check_atm.m4

diff --git a/m4/ax_check_atm.m4 b/m4/ax_check_atm.m4
new file mode 100644 (file)
index 0000000..004fe9f
--- /dev/null
+++ b/m4/ax_check_atm.m4
@@ -0,0 +1,93 @@
+# SYNOPSIS
+#
+#   AX_CHECK_ATM([action-if-found[, action-if-not-found]])
+#
+# DESCRIPTION
+#
+#   Look for libatm in a number of default locations, or in a provided location
+#   (via --with-atm=). Sets
+#       ATM_CFLAGS
+#       ATM_LDFLAGS
+#       ATM_LIBS
+#
+#   and calls ACTION-IF-FOUND or ACTION-IF-NOT-FOUND appropriately
+#
+# LICENSE
+#
+#   Copyright (c) 2021 Eivind Naess <eivnaes@yahoo.com>
+#
+#   Copying and distribution of this file, with or without modification, are
+#   permitted in any medium without royalty provided the copyright notice
+#   and this notice are preserved. This file is offered as-is, without any
+#   warranty.
+
+#serial 1
+
+AC_DEFUN([AX_CHECK_ATM], [
+    AC_ARG_WITH([atm],
+        [AS_HELP_STRING([--with-atm=DIR],
+            [With libatm support, see http://linux-atm.sourceforge.net])],
+        [
+            case "$withval" in
+            "" | y | ye | yes)
+                atmdirs="/usr/local /usr/lib /usr"  
+              ;;
+            n | no)
+                with_atm="no"
+              ;;
+            *)
+                atmdirs="$withval"
+              ;;
+            esac
+        ])
+    
+    if [ test "x${with_atm}" != "xno" ] ; then
+        ATM_LIBS="-latm"
+        for atmdir in $atmdirs; do
+            AC_MSG_CHECKING([for atm.h in $atmdir])
+            if test -f "$atmdir/include/atm.h"; then
+                ATM_CFLAGS="-I$atmdir/include"
+                ATM_LDFLAGS="-L$atmdir/lib"
+                AC_MSG_RESULT([yes])
+                break
+            else
+                AC_MSG_RESULT([no])
+            fi
+        done
+
+        # try the preprocessor and linker with our new flags,
+        # being careful not to pollute the global LIBS, LDFLAGS, and CPPFLAGS
+
+        AC_MSG_CHECKING([if compiling and linking against libatm works])
+
+        save_LIBS="$LIBS"
+        save_LDFLAGS="$LDFLAGS"
+        save_CPPFLAGS="$CPPFLAGS"
+        LDFLAGS="$LDFLAGS $ATM_LDFLAGS"
+        LIBS="$ATM_LIBS $LIBS"
+        CPPFLAGS="$ATM_CFLAGS $CPPFLAGS"
+        AC_LINK_IFELSE(
+            [AC_LANG_PROGRAM(
+                [#include <atm.h>
+                 #include <stddef.h>], 
+                [text2atm(NULL,NULL,0,0);])],
+            [
+                AC_MSG_RESULT([yes])
+                with_atm=yes
+                $1
+            ], [
+                AC_MSG_RESULT([no])
+                with_atm=""
+                $2
+            ])
+        CPPFLAGS="$save_CPPFLAGS"
+        LDFLAGS="$save_LDFLAGS"
+        LIBS="$save_LIBS"
+
+        AC_SUBST([ATM_CFLAGS])
+        AC_SUBST([ATM_LIBS])
+        AC_SUBST([ATM_LDFLAGS])
+    fi
+    AM_CONDITIONAL(WITH_LIBATM, test -n "${with_atm}")
+])
+