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Details

Type: Bug
Resolution: Duplicate
Priority: P1: Critical
Fix Version/s: 5.15.1, 6.0.0
Affects Version/s: 5.14.2
Component/s: Core: QString and Unicode
Labels:
None

Platform/s:

macOS
Commits:
c7420d9cb8e15d1f094fa92cfab635a86246c670 (qt/qtbase/dev) c39dbabde9d98b805f1d1884d3aeee5c8dcb4d03 (qt/qtbase/5.15)

Description

The QLocale::setDefault function seems to have no effect, at least with number options. I didn't test other options yet. This affects the default construction of a QLocale object as well as QString::arg. See the example code (also attached as project), which doesn't output what is expected according to the documentation.

Example code:

// setup a custom locale
QLocale customLocale( QLocale::English );
customLocale.setNumberOptions( QLocale::OmitGroupSeparator | QLocale::OmitLeadingZeroInExponent |
                               customLocale.numberOptions() );

// Set the custom locale as default
// https://doc.qt.io/qt-5/qlocale.html#setDefault
QLocale::setDefault( customLocale );

// using the custom locale directly
// https://doc.qt.io/qt-5/qlocale.html#toString-8
QString str1 = customLocale.toString( d );
qDebug() << str1;

// using the default locale which was set to be the custom locale is supposed to give the same output!
// https://doc.qt.io/qt-5/qlocale.html#QLocale
QLocale loc;
QString str2 = loc.toString( d );
qDebug() << str2;

// Arg is also supposed to use the default locale according to its documentation.
// https://doc.qt.io/qt-5/qstring.html#arg-9
QString str3 = QString( "%1" ).arg( d );
qDebug() << str3;

Output:

"5e-7"
"5e-07"
"5e-07"

Expected:

"5e-7"
"5e-7"
"5e-7"

Note that with Qt 5.9.1 the output is as expected!

Note: I could only test this using the Xcode platform SDK 10.13 and 10.15, with which Qt 5.14.2 outputs warnings about being not officially supported.