Andrey Semashev b96d05461f Compilation fixes for MinGW. Support for MSVC on ARM. ...

1. Apparently, some versions of MinGW declare interlocked intrinsics
without volatile qualifiers. To avoid compilation failures cast away
volatile from pointers. This should also work with qualified pointers as
well.

2. Changed interlocked read/write helpers for MSVC. VS2012 and later have
the option to change volatile behavior to the standard C++. In that mode,
volatile no longer enforces memory ordering. To ensure the correct
behavior of the helpers, use compiler barriers to prohibit code
reordering. Also, limit the version to x86 only.

3. Added a separate version of interlocked read/write helpers for MSVC on
ARM. To avoid dependency on the compiler switch, use intrinsics to load
and store values and also emit the hardware memory fence.

4. Added two versions of interlocked read/write helpers for gcc and
compatible compilers. One version is based on __atomic intrinsics, the
other one (for older versions) uses inline assembler. These versions
should be more optimal than the generic fallback.

2017-01-07 20:08:30 +03:00

..

boost

Compilation fixes for MinGW. Support for MSVC on ARM.

2017-01-07 20:08:30 +03:00