configure: split out each TLS library detector into its own function

... and put those functions in separate m4 files per TLS library.

1 files changed, 106 insertions, 0 deletions

diff --git a/m4/curl-rustls.m4 b/m4/curl-rustls.m4
new file mode 100644
index 000000000..f33822245
--- /dev/null
+++ b/m4/curl-rustls.m4
@@ -0,0 +1,106 @@
+#***************************************************************************
+#                                  _   _ ____  _
+#  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.
+#
+#***************************************************************************
+
+AC_DEFUN([CURL_WITH_RUSTLS], [
+dnl ----------------------------------------------------
+dnl check for rustls
+dnl ----------------------------------------------------
+
+if test "x$OPT_RUSTLS" != xno; then
+  _cppflags=$CPPFLAGS
+  _ldflags=$LDFLAGS
+  ssl_msg=
+
+  if test X"$OPT_RUSTLS" != Xno; then
+
+    if test "$OPT_RUSTLS" = "yes"; then
+      OPT_RUSTLS=""
+    fi
+
+    if test -z "$OPT_RUSTLS" ; then
+      dnl check for lib first without setting any new path
+
+      AC_CHECK_LIB(crustls, rustls_client_session_read,
+      dnl libcrustls found, set the variable
+       [
+         AC_DEFINE(USE_RUSTLS, 1, [if rustls is enabled])
+         AC_SUBST(USE_RUSTLS, [1])
+         RUSTLS_ENABLED=1
+         USE_RUSTLS="yes"
+         ssl_msg="rustls"
+	 test rustls != "$DEFAULT_SSL_BACKEND" || VALID_DEFAULT_SSL_BACKEND=yes
+        ], [], -lpthread -ldl)
+    fi
+
+    addld=""
+    addlib="-lpthread"
+    addcflags=""
+    bearssllib=""
+
+    if test "x$USE_RUSTLS" != "xyes"; then
+      dnl add the path and test again
+      addld=-L$OPT_RUSTLS/lib$libsuff
+      addcflags=-I$OPT_RUSTLS/include
+      rustlslib=$OPT_RUSTLS/lib$libsuff
+
+      LDFLAGS="$LDFLAGS $addld"
+      if test "$addcflags" != "-I/usr/include"; then
+         CPPFLAGS="$CPPFLAGS $addcflags"
+      fi
+
+      AC_CHECK_LIB(crustls, rustls_client_session_read,
+       [
+       AC_DEFINE(USE_RUSTLS, 1, [if rustls is enabled])
+       AC_SUBST(USE_RUSTLS, [1])
+       RUSTLS_ENABLED=1
+       USE_RUSTLS="yes"
+       ssl_msg="rustls"
+       test rustls != "$DEFAULT_SSL_BACKEND" || VALID_DEFAULT_SSL_BACKEND=yes
+       ],
+       AC_MSG_ERROR([--with-rustls was specified but could not find rustls.]),
+       -lpthread -ldl)
+    fi
+
+    if test "x$USE_RUSTLS" = "xyes"; then
+      AC_MSG_NOTICE([detected rustls])
+      check_for_ca_bundle=1
+
+      LIBS="-lcrustls -lpthread -ldl $LIBS"
+
+      if test -n "$rustlslib"; 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:$rustlslib"
+          export CURL_LIBRARY_PATH
+          AC_MSG_NOTICE([Added $rustlslib to CURL_LIBRARY_PATH])
+        fi
+      fi
+    fi
+
+  fi dnl rustls not disabled
+
+  test -z "$ssl_msg" || ssl_backends="${ssl_backends:+$ssl_backends, }$ssl_msg"
+fi
+])