isEmpty() does not work with a variable

Besajia

Hi, I have a file lib_template.pri


isEmpty(NAME)
{
        error(NAME must be set before including the file)
}

TEMPLATE = lib
CONFIG += static

TARGET = $$NAME

INCLUDEPATH += \
        $$PWD \

it is supposed to be used in the manner

NAME = lib_name
include($$qmake_scripts_dir/lib_template.pri)

isEmpty(...) always shows error as if NAME never defined
What is the problem?

mrjj

Hi
QMake scope rules is a bit surprising at times.

try the test as

isEmpty(NAME) { error(NAME must be set before including the file) }
(as a one liner )

aha_1980

@mrjj at least the opening brace needs to be on the same line ;)

mrjj

@aha_1980
yeah, i regularly forget that - as they cleverly made it look like a normal scope { }
but with the twist that first { must be on the same line. 😂

Besajia

thank you. However it is not intuitive for C++ programmer....