This is a workaround for https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78004

diff --git a/src/declarative/declarative.pro b/src/declarative/declarative.pro
index 5bf4e01..d1c56ae 100644
--- a/src/declarative/declarative.pro
+++ b/src/declarative/declarative.pro
@@ -4,7 +4,7 @@ QT         = core gui script network
 contains(QT_CONFIG, svg): QT += svg
 DEFINES   += QT_BUILD_DECLARATIVE_LIB QT_NO_URL_CAST_FROM_STRING
 win32-msvc*|win32-icc:QMAKE_LFLAGS += /BASE:0x66000000
-solaris-cc*:QMAKE_CXXFLAGS_RELEASE -= -O2
+QMAKE_CXXFLAGS_RELEASE -= -O2
 
 unix|win32-g++*:QMAKE_PKGCONFIG_REQUIRES = QtCore QtGui