Update config-macports.pri

config-macports.pri

@@ -2,23 +2,31 @@ boost {
   LIBS += -lboost_serialization-mt
 }
 macx:openmp {
+  # clang 12+ is OK to build Natron, but libomp 12+ has a bug on macOS when
+  # lanching tasks from a background thread, see https://bugs.llvm.org/show_bug.cgi?id=50579
+  LIBS += -L/opt/local/lib  -L/opt/local/lib/libomp -liomp5
   QMAKE_CC = /opt/local/bin/clang-mp-12
   QMAKE_CXX = /opt/local/bin/clang++-mp-12
+  # Recent clang cannot compile QtMac.mm
   QMAKE_OBJECTIVE_CC = clang
   QMAKE_OBJECTIVE_CXX = clang++
   QMAKE_LINK = $$QMAKE_CXX
-
   INCLUDEPATH += /opt/local/include /opt/local/include/libomp
-  LIBS += -L/opt/local/lib  -L/opt/local/lib/libomp -liomp5
   cc_setting.name = CC
   cc_setting.value = $$QMAKE_CC
   cxx_setting.name = CXX
   cxx_setting.value = $$QMAKE_CXX
+  # These settings are useless, unless someone finds out if there is a variable
+  # to override the Objective-C compiler.
+  objective_cc_setting.name = OBJECTIVE_CC
+  objective_cc_setting.value = $$QMAKE_OBJECTIVE_CC
+  objective_cxx_setting.name = OBJECTIVE_CXX
+  objective_cxx_setting.value = $$QMAKE_OBJECTIVE_CXX
   ld_setting.name = LD
   ld_setting.value = $$QMAKE_CC
-  ldplusplus_setting.name = LDPLUSPLUS
-  ldplusplus_setting.value = $$QMAKE_CXX
-  QMAKE_MAC_XCODE_SETTINGS += cc_setting cxx_setting ld_setting ldplusplus_setting
+  ldxx_setting.name = LDPLUSPLUS
+  ldxx_setting.value = $$QMAKE_CXX
+  QMAKE_MAC_XCODE_SETTINGS += cc_setting cxx_setting objective_cc_setting objective_cxx_setting ld_setting ldxx_setting
   QMAKE_FLAGS = "-B /usr/bin"
 
   # clang (as of 12.0.1) does not yet support index-while-building functionality