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what's the difference?? HEADERS = calculatorform.h HEADERS += calculatorform.h
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it's the same syntax like in C++.
The first one replaces/overwrites the the contents of HEADERS, the second one appends to it's already set contents. -
About the operators you can read "here":http://qt-project.org/doc/qt-5.0/qtdoc/qmake-advanced-usage.html#operators.
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"HEADERS = calculatorform.h" is assignment. Your HEADERS will contains ONLY calculatorform.h.
HEADERS += calculatorform.h is addition assignment and it equals HEADERS = $$HEADERS calculatorform.h.
You can test it with:
@TEST = test.a test.b
message($$TEST)
TEST += test.c
message($$TEST)
TEST = $$TEST test.d
message($$TEST)
TEST = test.f
message($$TEST)@
