As the standard compilers on their respective platforms, other
compilers tend to mask as Clang, GCC, or MSVC, leading to complicated
code when you actually mean just one of these compilers:
#if defined(Q_CC_GNU) && !defined(Q_CC_CLANG) && !defined(Q_CC_INTEL)
This is particularly problematic when combined with version checks:
#if defined(Q_CC_GNU) && Q_CC_GNU >= 900
will, e.g., not match Clang 10.0.0, which masks as GCC 4.2. The
correct way (until a new kid on the block starts to mask as GCC, too)
to check for GCC >= 9.0 atm is:
#if defined(Q_CC_CLANG) || defined(Q_CC_INTEL) || !(defined(Q_CC_GNU) && Q_CC_GNU >= 900)
The new macros make such checks intuitive and hard-to-misuse:
#if defined(Q_CC_GNU_ONLY) && Q_CC_GNU >= 900
Use it in qcompilerdetection.h.
Pick-to: 6.3 6.2 5.15
Change-Id: Idcdf973fbc4708f58ed91c800be3d5e599e5b7e6
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
c95fd3a7ce