1 files changed, 109 insertions, 0 deletions
diff --git a/m4/curl-mbedtls.m4 b/m4/curl-mbedtls.m4
new file mode 100644
index 000000000..4c91cba36
--- /dev/null
+++ b/m4/curl-mbedtls.m4
@@ -0,0 +1,109 @@
+#***************************************************************************
+#                                  _   _ ____  _
+#  Project                     ___| | | |  _ \| |
+#                             / __| | | | |_) | |
+#                            | (__| |_| |  _ <| |___
+#                             \___|\___/|_| \_\_____|
+#
+# Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
+#
+# This software is licensed as described in the file COPYING, which
+# you should have received as part of this distribution. The terms
+# are also available at https://curl.se/docs/copyright.html.
+#
+# You may opt to use, copy, modify, merge, publish, distribute and/or sell
+# copies of the Software, and permit persons to whom the Software is
+# furnished to do so, under the terms of the COPYING file.
+#
+# This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+# KIND, either express or implied.
+#
+#***************************************************************************
+
+dnl ----------------------------------------------------
+dnl check for mbedTLS
+dnl ----------------------------------------------------
+AC_DEFUN([CURL_WITH_MBEDTLS], [
+
+if test "x$OPT_MBEDTLS" != xno; then
+  _cppflags=$CPPFLAGS
+  _ldflags=$LDFLAGS
+  ssl_msg=
+
+  if test X"$OPT_MBEDTLS" != Xno; then
+
+    if test "$OPT_MBEDTLS" = "yes"; then
+      OPT_MBEDTLS=""
+    fi
+
+    if test -z "$OPT_MBEDTLS" ; then
+      dnl check for lib first without setting any new path
+
+      AC_CHECK_LIB(mbedtls, mbedtls_havege_init,
+      dnl libmbedtls found, set the variable
+       [
+         AC_DEFINE(USE_MBEDTLS, 1, [if mbedTLS is enabled])
+         AC_SUBST(USE_MBEDTLS, [1])
+         MBEDTLS_ENABLED=1
+         USE_MBEDTLS="yes"
+         ssl_msg="mbedTLS"
+	 test mbedtls != "$DEFAULT_SSL_BACKEND" || VALID_DEFAULT_SSL_BACKEND=yes
+        ], [], -lmbedx509 -lmbedcrypto)
+    fi
+
+    addld=""
+    addlib=""
+    addcflags=""
+    mbedtlslib=""
+
+    if test "x$USE_MBEDTLS" != "xyes"; then
+      dnl add the path and test again
+      addld=-L$OPT_MBEDTLS/lib$libsuff
+      addcflags=-I$OPT_MBEDTLS/include
+      mbedtlslib=$OPT_MBEDTLS/lib$libsuff
+
+      LDFLAGS="$LDFLAGS $addld"
+      if test "$addcflags" != "-I/usr/include"; then
+         CPPFLAGS="$CPPFLAGS $addcflags"
+      fi
+
+      AC_CHECK_LIB(mbedtls, mbedtls_ssl_init,
+       [
+       AC_DEFINE(USE_MBEDTLS, 1, [if mbedTLS is enabled])
+       AC_SUBST(USE_MBEDTLS, [1])
+       MBEDTLS_ENABLED=1
+       USE_MBEDTLS="yes"
+       ssl_msg="mbedTLS"
+       test mbedtls != "$DEFAULT_SSL_BACKEND" || VALID_DEFAULT_SSL_BACKEND=yes
+       ],
+       [
+         CPPFLAGS=$_cppflags
+         LDFLAGS=$_ldflags
+       ], -lmbedx509 -lmbedcrypto)
+    fi
+
+    if test "x$USE_MBEDTLS" = "xyes"; then
+      AC_MSG_NOTICE([detected mbedTLS])
+      check_for_ca_bundle=1
+
+      LIBS="-lmbedtls -lmbedx509 -lmbedcrypto $LIBS"
+
+      if test -n "$mbedtlslib"; then
+        dnl when shared libs were found in a path that the run-time
+        dnl linker doesn't search through, we need to add it to
+        dnl CURL_LIBRARY_PATH to prevent further configure tests to fail
+        dnl due to this
+        if test "x$cross_compiling" != "xyes"; then
+          CURL_LIBRARY_PATH="$CURL_LIBRARY_PATH:$mbedtlslib"
+          export CURL_LIBRARY_PATH
+          AC_MSG_NOTICE([Added $mbedtlslib to CURL_LIBRARY_PATH])
+        fi
+      fi
+    fi
+
+  fi dnl mbedTLS not disabled
+
+  test -z "$ssl_msg" || ssl_backends="${ssl_backends:+$ssl_backends, }$ssl_msg"
+fi
+
+])