How to specify separate compilation options for different targets in qmake?

Question

Is there any way to specify separate compilation options for different targets in qmake ?

For example:

QMAKE_CXXFLAGS += -O 
SOURCES += file1.cpp    

QMAKE_CXXFLAGS += -std=gnu++0x -O 
SOURCES += file2.cpp

So file1.cpp will be compiled only with -O option and file file2.cpp with -std=gnu++0x -O options.

Answer 1

You could create and use a separate "extra compiler", as follows:

# Use the built-in compiler for file1.cpp
QMAKE_CXXFLAGS += -O 
SOURCES += file1.cpp    

# Create a new compiler for file2.cpp
gnupp0x.input = SOURCES_GNUPP0X
gnupp0x.output = ${QMAKE_FILE_BASE}.o
gnupp0x.commands = g++ -std=gnu++0x $$QMAKE_CXXFLAGS ${QMAKE_FILE_NAME} -o ${QMAKE_FILE_OUT}
QMAKE_EXTRA_COMPILERS += gnupp0x

# Use the new compiler for file2.cpp
SOURCES_GNUPP0X += file2.cpp