How to add preprocessor directive into .pro ?

[Anonymous_Banned275]

Is there a way to add preprocessor directive into QT project ( x.pro) file?

is used to comment out the line , hence

( and tick tack toe marks the line to do unwanted formatting here...)

#define TEST

wouldn't do much

[JonB]

@AnneRanch
For "preprocessor directive", .pro files can have their own variables if that is what you have in mind via

TEST = 1

See https://stackoverflow.com/questions/7754218/qmake-how-to-add-and-use-a-variable-into-the-pro-file.

[Anonymous_Banned275]

@JonB Per doc , i tried this

DEFINES += #define TEST_DEFINE

no go

Doc does not help - used their example....

[JonB]

@AnneRanch

DEFINES += TEST_DEFINE

should cause -DTEST_DEFINE to be added to compiler command line.
https://doc.qt.io/qt-6/qmake-variable-reference.html#defines

[Anonymous_Banned275]

@JonB Could you kindly tell me WHERE in QT Creator I can read compiler options?

[JonB]

@AnneRanch
I don't have Creator to hand. There will be somewhere in "Build" where it tells you what compiler options it uses.

Even there you might not be shown what your DEFINES are set to/what it will pass to the compiler. I would run a compilation and look at the actual command line being executed which it shows in one of the tabs at the bottom, "Compile" or "Build" Output or similar. There I would expect/hope to see it actually passing -DTEST_DEFINE somewhere on the command line if your .pro has the DEFINES += TEST_DEFINE example.

[Anonymous_Banned275]

SOLVED

putting

DEFINES += define DEBUG

in main .pro file

has same effect as putting in

#define DEBUG

here is a snippet of compiler output?

clang++ -c -pipe -g -std=gnu++1z -Wall -Wextra -fPIC -D_REENTRANT **-Ddefine -DDEBUG** -DQT_QML_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_BLUETOOTH_LIB -DQT_NETWORK_LIB -DQT_DBUS_LIB -DQT_CORE_LIB -I. -I/home/nov25-1/Qt/Nov26/6.5.0/gcc_64/include -I/home/nov25-1/Qt/Nov26/6.5.0/gcc_64/include/QtWidgets -I/home/nov25-1/Qt/Nov26/6.5.0/gcc_64/include/QtGui -I/home/nov25-1/Qt/Nov26/6.5.0/gcc_64/include/QtBluetooth -I/home/nov25-1/Qt/Nov26/6.5.0/gcc_64/include/QtNetwork -I/home/nov25-1/Qt/Nov26/6.5.0/gcc_64/include/QtDBus