Disable GCC warning for noexcept

GCC >= 6.4 is generating warnings for function signature with noexcept. In
C++ 17 noexcept is part of the function signature. But the warning is
catching cases where a changed signature is not a problem, because it is
a template it self.

Task-number: QTCREATORBUG-18959
Change-Id: Ia6fa79c10e16d8c96a53c849ea15dcec94538fbe
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@qt.io>

qtcreator.pri

@@ -157,6 +157,8 @@ osx {
     INSTALL_APP_PATH     = $$QTC_PREFIX/bin
 }
 
+gcc:!clang: QMAKE_CXXFLAGS += -Wno-noexcept-type
+
 RELATIVE_PLUGIN_PATH = $$relative_path($$IDE_PLUGIN_PATH, $$IDE_BIN_PATH)
 RELATIVE_LIBEXEC_PATH = $$relative_path($$IDE_LIBEXEC_PATH, $$IDE_BIN_PATH)
 RELATIVE_DATA_PATH = $$relative_path($$IDE_DATA_PATH, $$IDE_BIN_PATH)

tests/unit/unittest/unittest.pro

@@ -28,6 +28,8 @@ QMAKE_LFLAGS += -fno-merge-debug-strings -fuse-ld=gold
 CONFIG(release, debug|release):QMAKE_LFLAGS += -Wl,--strip-debug
 }
 
+gcc:!clang: QMAKE_CXXFLAGS += -Wno-noexcept-type
+
 # create fake CppTools.json for the mime type definitions
 dependencyList = "\"Dependencies\" : []"
 cpptoolsjson.input = $$PWD/../../../src/plugins/cpptools/CppTools.json.in