GCC, in particular, doesn't understand that the types are
fundamentally the same unless you compile with -O3, so help the
compiler by using bit_cast when it is available.
GCC now produces the same code at -O2 as previously only at -O3. Still
no tail-calls, though.
Task-number: QTBUG-118913
Change-Id: Ib1241a98f1de49c59a2e16b7d1f5cf813db4edf7
Reviewed-by: Ivan Solovev <ivan.solovev@qt.io>
In particular, match the value of ::unordered to each std library
implementation.
Legal disclaimer:
The values were provided to this author in a comment on QTBUG-118913.
This author hereby confirms he didn't look at any of the
implementations himself. The stdlib detection macros are taken from
existing code in qcompilerdetection.h. I didn't succeed in googling a
corresponding marker for MSSTL, and I didn't look at the
implementation or Boost.Config to find one, so this patch just assumes
MSSTL as a fall-back, which is probably wrong, since we may still have
Dinkumware and RougeWave STLs to deal with on embedded platforms.
Add tests to ensure the values are the same on all platforms.
To maximize coverage, rename qcompare.qdoc to qcompare.cpp and add a
bunch of compile-time tests there. These depend in part on bit_cast,
which we cannot depend on, so tst_qcompare contains the same tests
using memcpy.
Fixes: QTBUG-118913
Change-Id: I46c922c8e3ea37d7c01a71361c7a689340f9047d
Reviewed-by: Ivan Solovev <ivan.solovev@qt.io>
Marc Mutz