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QUnicodeTools: mark a test-only flag constexpr/constinit

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For QT_BUILD_INTERNAL, mark the flag constinit, because tests may want
to set it (which they better do before Qt spins up threads, because
otherwise this non-atomic flag runs into UB (data races)).

For non-QT_BUILD_INTERNAL, mark the flag constexpr, so dead code
elimination can do its job.

Inconsistently, of the two readers of the flag, one was ifdef'ed on
QT_BUILD_INTERNAL, while the other wasn't. Settle on exposing both,
which increases the compiler coverage of the code.

Task-number: QTBUG-100486
Task-number: QTBUG-100485
Change-Id: I6e041359b8214b40d80eefa92c26422aada3eb59
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
(cherry picked from commit 0c716c687a8c65e7907912d6d5d6beb891238a95)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
This commit is contained in:
Marc Mutz 2022-08-11 16:32:59 +02:00 committed by Qt Cherry-pick Bot
parent f26c254feb
commit 7ad965b145
1 changed files with 6 additions and 3 deletions
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9
src/corelib/text/qunicodetools.cpp
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@ -20,7 +20,12 @@ QT_BEGIN_NAMESPACE
using namespace Qt::StringLiterals;
Q_AUTOTEST_EXPORT int qt_initcharattributes_default_algorithm_only = 0;
#ifdef QT_BUILD_INTERNAL
Q_CONSTINIT Q_AUTOTEST_EXPORT
#else
constexpr
#endif
int qt_initcharattributes_default_algorithm_only = 0;
namespace QUnicodeTools {
@ -257,7 +262,6 @@ static void getWordBreaks(const char16_t *string, qsizetype len, QCharAttributes
const QUnicodeTables::Properties *prop = QUnicodeTables::properties(ucs4);
QUnicodeTables::WordBreakClass ncls = (QUnicodeTables::WordBreakClass) prop->wordBreakClass;
#ifdef QT_BUILD_INTERNAL
if (qt_initcharattributes_default_algorithm_only) {
// as of Unicode 5.1, some punctuation marks were mapped to MidLetter and MidNumLet
// which caused "hi.there" to be treated like if it were just a single word;
@ -268,7 +272,6 @@ static void getWordBreaks(const char16_t *string, qsizetype len, QCharAttributes
else if (ucs4 == 0x003A) // COLON
ncls = QUnicodeTables::WordBreak_MidLetter;
}
#endif
uchar action = WB::breakTable[cls][ncls];
switch (action) {