Allow building with system wide mbedtls on X11

Using builtin_mbedtls=yes is still the default as many distributions
do not ship with mbedtls included.

SConstruct

@@ -181,6 +181,7 @@ opts.Add(BoolVariable('builtin_libtheora', "Use the builtin libtheora library",
 opts.Add(BoolVariable('builtin_libvorbis', "Use the builtin libvorbis library", True))
 opts.Add(BoolVariable('builtin_libvpx', "Use the builtin libvpx library", True))
 opts.Add(BoolVariable('builtin_libwebp', "Use the builtin libwebp library", True))
+opts.Add(BoolVariable('builtin_mbedtls', "Use the builtin mbedTLS library", True))
 opts.Add(BoolVariable('builtin_opus', "Use the builtin opus library", True))
 opts.Add(BoolVariable('builtin_pcre2', "Use the builtin pcre2 library)", True))
 opts.Add(BoolVariable('builtin_recast', "Use the builtin recast library", True))

modules/mbedtls/SCsub

@@ -5,9 +5,8 @@ Import('env_modules')
 
 env_mbed_tls = env_modules.Clone()
 
+if env['builtin_mbedtls']:
     # Thirdparty source files
-thirdparty_dir = "#thirdparty/mbedtls/library/"
-
     thirdparty_sources = [
         "aes.c",
         "aesni.c",
@@ -83,6 +82,7 @@ thirdparty_sources = [
         "xtea.c"
     ]
 
+    thirdparty_dir = "#thirdparty/mbedtls/library/"
     thirdparty_sources = [thirdparty_dir + file for file in thirdparty_sources]
     env_mbed_tls.add_source_files(env.modules_sources, thirdparty_sources)
     env_mbed_tls.Append(CPPPATH=["#thirdparty/mbedtls/include/"])

modules/websocket/SCsub

@@ -71,6 +71,7 @@ else:
     wrapper_includes = ["#thirdparty/lws/mbedtls_wrapper/include/" + inc for inc in ["internal", "openssl", "platform", ""]]
     env_lws.Append(CPPPATH=wrapper_includes)
 
+    if env['builtin_mbedtls']:
         mbedtls_includes = "#thirdparty/mbedtls/include"
         env_lws.Append(CPPPATH=[mbedtls_includes])
 

platform/x11/detect.py

@@ -152,6 +152,10 @@ def configure(env):
 
     # FIXME: Check for existence of the libs before parsing their flags with pkg-config
 
+    if not env['builtin_mbedtls']:
+        # mbedTLS does not provide a pkgconfig config yet. See https://github.com/ARMmbed/mbedtls/issues/228
+        env.Append(LIBS=['mbedtls', 'mbedcrypto', 'mbedx509'])
+
     if not env['builtin_libwebp']:
         env.ParseConfig('pkg-config libwebp --cflags --libs')