That implies we need to differentiate between a variable set but empty
and an empty variable. GCC, Clang and the Intel compiler accept -msse2
on 64-bit builds without warning (they also accept -mno-sse2), but the
Microsoft compiler does not have that option.
Change-Id: I54233388ba10994996ae3e749fd829085e8fd7b7
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>
Modify configure.exe to run some configure-time tests and check if
the SSE and AVX compiler features are supported.
The tests themselves required a bit of changes to compile with
MSVC. The include in sse4_2.cpp was wrong. And for whatever reason, it
didn't like the volatile variables, which GCC, Clang and ICC have been
happy with. This should produce no effect in compilation, though: even
dead code must be syntactically correct. We're not running the output.
Change-Id: Ibe5d0904a378a7efed853c7215f88a2ddcefb1b3
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@nokia.com>
This is the first step in supporting these checks on Windows.
Change-Id: I77cfd46bd733161ad2e52c2f76a6354b95ff737d
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@nokia.com>
