ContextImpl::currentContext contains a reference to one of the
DeviceInfoImpl objects from:
static std::vector<DeviceInfoImpl> global_devices;
ContextImpl::currentContext is destroyed in the destructor
for the statically defined object __module, and relies on its
DeviceInfoImpl reference to query some hardware features while
being destroyed.
This means that we need to ensure that the global_devices vector is
destroyed affter __module, otherwise ContextImpl::currentContext's
DeviceInfoImpl reference will no longer be valid when __module is
destroyed.
Since these variables are all confined to a single compilation unit,
they will be destruct from bottom to top, so we need to make sure
that __module is the bottom definition so it can be destroyed first.
In C99 'inline' is not a hint to the compiler to inline the function,
it is an attribute that affects the linkage of the function. 'inline'
functions are required to have a definition in a different compiliation
unit, so compilers are free to delete 'inline' functions if they want to.
This issue can be seen in Clang when compiling at -O0. Clang
will sometimes delete 'inline' functions which creates an invalid
program.
Issue 3746: http://code.opencv.org/issues/3746
The LLVM/Clang 3.3 has a bug when compile a cl kernel with
assignment of a scalar to a vector data type. This patch
could work around this bug.
Signed-off-by: Zhigang Gong <zhigang.gong@intel.com>
OpenCV Error: Unknown error code -6 (OpenCL function is not available: [clGetPlatformIDs]) in opencl_check_fn, file /home/ahb/software/opencv/modules/ocl/src/cl_runtime/cl_runtime.cpp, line 83
The issue results from modules/ocl/src/cl_runtime/cl_runtime.cpp checking for
"linux" instead of "__linux__" (cp. http://sourceforge.net/p/predef/wiki/OperatingSystems/)
Adjust all other occurrences of "defined(linux)" as well.
