qmake: how to supply multiple variables via command-line?

Question

qmake allows to supply a variables via a command-line interface like this:

qmake \"CONFIG += release\" \"MY_VAR = hello\"

So i

Answer 1

The question is misleading. You CAN supply any number of variables.

.pro file:

....
message($$VAR1)
message($$VAR2)

qmake run:

qmake ... "VAR1=VALUE1" "VAR2=VALUE2"

compiler output:

09:40:13: Running build steps for project test...
09:40:13: Starting: "c:\qtsdk\desktop\qt\4.8.1\mingw\bin\qmake.exe" D:\tmp\test\test.pro -r -spec win32-g++ "CONFIG+=declarative_debug" "VAR1=VALUE1" "VAR2=VALUE2"
Project MESSAGE: VALUE1
Project MESSAGE: VALUE2
Project MESSAGE: VALUE1
Project MESSAGE: VALUE2
Project MESSAGE: VALUE1
Project MESSAGE: VALUE2
09:40:14: The process "c:\qtsdk\desktop\qt\4.8.1\mingw\bin\qmake.exe" exited normally.

Answer 2

qmake can access environment variables via $$() syntax (internal variables are accessed with $${} syntax). This can be used to pass any number of variables to qmake.