Use autoconf/automake to configure and make ppp

[ppp.git] / m4 / ax_check_openssl.m4

diff --git a/m4/ax_check_openssl.m4 b/m4/ax_check_openssl.m4
new file mode 100644 (file)
index 0000000..8ae39ca
--- /dev/null
+++ b/m4/ax_check_openssl.m4
@@ -0,0 +1,119 @@
+# ===========================================================================
+#     http://www.gnu.org/software/autoconf-archive/ax_check_openssl.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   AX_CHECK_OPENSSL([action-if-found[, action-if-not-found]])
+#
+# DESCRIPTION
+#
+#   Look for OpenSSL in a number of default spots, or in a user-selected
+#   spot (via --with-openssl).  Sets
+#
+#     OPENSSL_INCLUDES to the include directives required
+#     OPENSSL_LIBS to the -l directives required
+#     OPENSSL_LDFLAGS to the -L or -R flags required
+#
+#   and calls ACTION-IF-FOUND or ACTION-IF-NOT-FOUND appropriately
+#
+#   This macro sets OPENSSL_INCLUDES such that source files should use the
+#   openssl/ directory in include directives:
+#
+#     #include <openssl/hmac.h>
+#
+# LICENSE
+#
+#   Copyright (c) 2009,2010 Zmanda Inc. <http://www.zmanda.com/>
+#   Copyright (c) 2009,2010 Dustin J. Mitchell <dustin@zmanda.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 9
+
+AU_ALIAS([CHECK_SSL], [AX_CHECK_OPENSSL])
+AC_DEFUN([AX_CHECK_OPENSSL], [
+    found=false
+    AC_ARG_WITH([openssl],
+        [AS_HELP_STRING([--with-openssl=DIR],
+            [With openssl support, see http://www.openssl.org])],
+        [
+            case "$withval" in
+            "" | y | ye | yes )
+                ssldirs="/usr/local/ssl /usr/lib/ssl /usr/ssl /usr/pkg /usr/local /usr"
+              ;;
+            n | no )
+              ;;
+            *) ssldirs="$withval"
+              ;;
+            esac
+        ], [
+            ssldirs="/usr/local/ssl /usr/lib/ssl /usr/ssl /usr/pkg /usr/local /usr"
+        ])
+
+    AS_IF([test "${with_openssl}" != "no"], [
+        OPENSSL_INCLUDES=
+        for ssldir in $ssldirs; do
+            AC_MSG_CHECKING([for openssl/ssl.h in $ssldir])
+            AS_IF([ test -f "$ssldir/include/openssl/ssl.h" ], [
+                OPENSSL_INCLUDES="-I$ssldir/include"
+                OPENSSL_LDFLAGS="-L$ssldir/lib"
+                OPENSSL_LIBS="-lssl -lcrypto"
+                found=true
+                AC_MSG_RESULT([yes])
+                break
+            ], [
+                AC_MSG_RESULT([no])
+            ])
+        done])
+     
+    AS_IF([test "${with_openssl}" != "no" && test ! ${found}], [ 
+        # if pkg-config is installed and openssl has installed a .pc file,
+        # then use that information and don't search ssldirs
+        AC_PATH_PROG([PKG_CONFIG], [pkg-config])
+        if test x"$PKG_CONFIG" != x""; then
+            OPENSSL_LDFLAGS=`$PKG_CONFIG openssl --libs-only-L 2>/dev/null`
+            if test $? = 0; then
+                OPENSSL_LIBS=`$PKG_CONFIG openssl --libs-only-l 2>/dev/null`
+                OPENSSL_INCLUDES=`$PKG_CONFIG openssl --cflags-only-I 2>/dev/null`
+                found=true
+            fi
+        fi
+    ])
+
+    AS_IF([test "${with_openssl}" != "no" && test ${found}], [
+
+        # try the preprocessor and linker with our new flags,
+        # being careful not to pollute the global LIBS, LDFLAGS, and CPPFLAGS
+
+        AC_MSG_CHECKING([whether compiling and linking against OpenSSL works])
+        echo "Trying link with OPENSSL_LDFLAGS=$OPENSSL_LDFLAGS;" \
+            "OPENSSL_LIBS=$OPENSSL_LIBS; OPENSSL_INCLUDES=$OPENSSL_INCLUDES" >&AS_MESSAGE_LOG_FD
+
+        save_LIBS="$LIBS"
+        save_LDFLAGS="$LDFLAGS"
+        save_CPPFLAGS="$CPPFLAGS"
+        LDFLAGS="$LDFLAGS $OPENSSL_LDFLAGS"
+        LIBS="$OPENSSL_LIBS $LIBS"
+        CPPFLAGS="$OPENSSL_INCLUDES $CPPFLAGS"
+        AC_LINK_IFELSE(
+            [AC_LANG_PROGRAM([#include <openssl/ssl.h>], [SSL_new(NULL)])],
+            [
+                AC_MSG_RESULT([yes])
+                $1
+            ], [
+                AC_MSG_RESULT([no])
+                $2
+            ])
+        CPPFLAGS="$save_CPPFLAGS"
+        LDFLAGS="$save_LDFLAGS"
+        LIBS="$save_LIBS"
+
+        AC_SUBST([OPENSSL_INCLUDES])
+        AC_SUBST([OPENSSL_LIBS])
+        AC_SUBST([OPENSSL_LDFLAGS])
+    ], [ $2 ])
+])