QMake defineReplace

Silent_Alex

Hi guys!
I'm research into a qmake in current time, I have been taught how to define the self-function by some technical manual from this exmaple. However,there is a strange warning reported by Qt Creator when I had an attempt to write 'defineReplace' funtion, As following tips:
'AddCompilerOptions' is not a recognized test function.
the QMake code is that:

defineReplace(AddCompilerOptions){

    for(compileOption,ARGS){
        QMAKE_CXXFLAGS += $$compileOption
        message("Insider option $$QMAKE_CXXFLAGS")
    }

    QMAKE_CXXFLAGS += $$ARGS
    return(true)
}

Additionally, it seems to not be affected for the above code, even if the key 'defineReplace' was substituted for key 'defineReplace'.
There is nothing to be appended the variable QMAKE_CXXFLAGS When I try to print it in term of qmake function 'message' outside the scope of function AddCompilerOptions.

thanks！

SGaist

Hi,

Can you provide a minimal .pro file that can show the behaviour ?

That said, one small difference between the example and your function is that you are not using camelCase for its name.

Silent_Alex

@SGaist Hi, the minimal demo is that:

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

CONFIG += c++17

QMAKE_CXXFLAGS += /std:c++17

defineReplace(addCompilerOptions){

    for(compileOption,ARGS){
        QMAKE_CXXFLAGS += $$compileOption
        message("Insider option $$QMAKE_CXXFLAGS") #(1)
    }

    QMAKE_CXXFLAGS += $$ARGS
    return(true)
}


AddCompilerOptions(/openmp /fp:fast /diagnostics:caret)

message($$quote(The option of compile $$QMAKE_CXXFLAGS)) #(2)

# The following define makes your compiler emit warnings if you use
# any Qt feature that has been marked deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

include(test_a/test_a.pri)

f=quote(I like your)
k=quote(like)

str_a=$$str_member($$k,0,$$num_add($$str_size($$f),-1))

message("The size of Str: $$k ")

# You can also make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

SOURCES += \
    dialog.cpp \
    main.cpp \
    mainwindow.cpp \
    test.cpp

HEADERS += \
    dialog.h \
    mainwindow.h \
    test.h

FORMS += \
    dialog.ui \
    mainwindow.ui \
    test.ui

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

It seems that my problem is not tremendously relative to camelCase.
In comment (1), It was signaled that these flag have been append the variable "QMAKE_CXX_FLAGS" in term of function message. However, In comment (2), these flags which are appended in function AddCompilerOptions are not printed.

Silent_Alex

Update:
The warning 'addCompilerOptions' is not a recognized test function.' has been solved by myself in term of the change to code in following section:

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

CONFIG += c++17

QMAKE_CXXFLAGS += /std:c++17

defineReplace(addCompilerOptions){

    for(compileOption,ARGS){
        QMAKE_CXXFLAGS += $$compileOption
    }

    QMAKE_CXXFLAGS += $$ARGS
    return($$ARGS)
}
<----------------Changes------------->
testFlag=/openmp /fp:fast /diagnostics:care

k=$$addCompilerOptions($$testFlag)
<----------------Changes------------->

message($$quote(The option of compile $$QMAKE_CXXFLAGS))

# The following define makes your compiler emit warnings if you use
# any Qt feature that has been marked deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

include(test_a/test_a.pri)

f=quote(I like your)
k=quote(like)

str_a=$$str_member($$k,0,$$num_add($$str_size($$f),-1))

message("The size of Str: $$k ")

# You can also make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

SOURCES += \
    dialog.cpp \
    main.cpp \
    mainwindow.cpp \
    test.cpp

HEADERS += \
    dialog.h \
    mainwindow.h \
    test.h

FORMS += \
    dialog.ui \
    mainwindow.ui \
    test.ui

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

However, there is no any effect to variable QMAKE_CXXFLAGS outside scope of addCompilerOptions.

SGaist

Because it's not how you should use it. As the documentation explains: "this type of function should be used on the right-hand side of assignments (that is, as an operand)."

QMAKE_CXXFLAGS += /std:c++17
QMAKE_CXXFLAGS = $$addCompilerOptions(your_list_of_options)