qt513-qtwebengine @5.13.2_2: Exception: No 10.15.6+ SDK found

[dliessi (Davide Liessi)]

On macOS 10.15, qt513-qtwebengine fails with this error:

Project MESSAGE: Running: /opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_aqua_qt513/qt513-qtwebengine/work/qtwebengine-everywhere-src-5.13.2/src/3rdparty/gn/out/Release/gn gen /opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_aqua_qt513/qt513-qtwebengine/work/qtwebengine-everywhere-src-5.13.2/src/core/release --script-executable=/opt/local/Library/Frameworks/Python.framework/Versions/2.7/bin/python2 --args='use_qt=true closure_compile=false is_component_build=false is_shared=true enable_message_center=false enable_mus=false enable_nacl=false enable_remoting=false enable_reporting=false enable_swiftshader=false enable_web_auth=false enable_web_speech=false enable_widevine=true has_native_accessibility=false enable_debugallocation=false use_allocator_shim=false use_allocator="none" use_custom_libcxx=false v8_use_external_startup_data=false toolkit_views=false treat_warnings_as_errors=false safe_browsing_mode=0 optimize_webui=false use_jumbo_build=true jumbo_file_merge_limit=8 jumbo_build_excluded=["browser"] enable_basic_printing=true enable_print_preview=true enable_pdf=true enable_plugins=true enable_spellcheck=true enable_webrtc=true enable_extensions=true enable_precompiled_headers=false is_official_build=true is_debug=false symbol_level=0 remove_webcore_debug_symbols=true remove_v8base_debug_symbols=true optimize_for_size=true v8_use_snapshot=true use_kerberos=true is_clang=true use_sysroot=false clang_base_path="/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr" clang_use_chrome_plugins=false mac_deployment_target="10.15" mac_sdk_min="10.15.6" use_external_popup_menu=false use_browser_spellchecker=true qtwebengine_target="/opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_aqua_qt513/qt513-qtwebengine/work/qtwebengine-everywhere-src-5.13.2/src/core/release:QtWebEngineCore"' --root=/opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_aqua_qt513/qt513-qtwebengine/work/qtwebengine-everywhere-src-5.13.2/src/3rdparty/chromium 
ERROR at //build/config/mac/mac_sdk.gni:68:5: Script returned non-zero exit code.
    exec_script("//build/mac/find_sdk.py", find_sdk_args, "list lines")
    ^----------
Current dir: /opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_aqua_qt513/qt513-qtwebengine/work/qtwebengine-everywhere-src-5.13.2/src/core/release/
Command: /opt/local/Library/Frameworks/Python.framework/Versions/2.7/bin/python2 /opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_aqua_qt513/qt513-qtwebengine/work/qtwebengine-everywhere-src-5.13.2/src/3rdparty/chromium/build/mac/find_sdk.py --print_sdk_path 10.15.6
Returned 1.
stderr:

Traceback (most recent call last):
  File "/opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_aqua_qt513/qt513-qtwebengine/work/qtwebengine-everywhere-src-5.13.2/src/3rdparty/chromium/build/mac/find_sdk.py", line 104, in <module>
    print main()
  File "/opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_aqua_qt513/qt513-qtwebengine/work/qtwebengine-everywhere-src-5.13.2/src/3rdparty/chromium/build/mac/find_sdk.py", line 77, in main
    raise Exception('No %s+ SDK found' % min_sdk_version)
Exception: No 10.15.6+ SDK found

See //build/config/sysroot.gni:64:3: whence it was imported.
  import("//build/config/mac/mac_sdk.gni")
  ^--------------------------------------
See //chrome/installer/BUILD.gn:7:1: whence it was imported.
import("//build/config/sysroot.gni")
^----------------------------------
See //BUILD.gn:71:5: which caused the file to be included.
    "//chrome/installer",
    ^-------------------
Project ERROR: GN run error!

See the ​full log.

I noticed that on 10.12, 10.13 and 10.14 the command contains mac_sdk_min="10.1X" (X being respectively 2, 3, and 4), while on 10.15 that argument is mac_sdk_min="10.15.6": maybe that is the problem.