7b5dbe165d
GCC 9 doesn't accept [[unlikely]] between the (condition) and the
compound-statement of an if, in both C++17 and C++20 modes:
qdecompresshelper.cpp: In member function ‘qsizetype QDecompressHelper::readZLib(char*, qsizetype)’:
qcompilerdetection.h:1048:31: error: attributes at the beginning of statement are ignored [-Werror=attributes]
1048 | # define Q_UNLIKELY_BRANCH [[unlikely]]
| ^~~~~~~~~~~~
qdecompresshelper.cpp:597:54: note: in expansion of macro ‘Q_UNLIKELY_BRANCH’
597 | if (ret == Z_DATA_ERROR && !triedRawDeflate) Q_UNLIKELY_BRANCH {
| ^~~~~~~~~~~~~~~~~
See also https://stackoverflow.com/questions/51797959/how-to-use-c20s-likely-unlikely-attribute-in-if-else-statement
Put it into the compound-statement instead, then GCC 9 accepts it. The
two are equivalent, because [[likely]] marks a path, and there is no
selection statement between the two positions.
Amends 5ae84d0afbd3690a2c003d06d920566a5d56dc8c.
Change-Id: Iac1970219c98a1c26e450dfe6bad6583e4d32c29
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
(cherry picked from commit 7a7804d4b454021d68d1d5138d134ef62abfcdb3)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>