* Add debug build option to MacOs and iOS build scripts
* osx: allow selection of MACOSX_DEPLOYMENT_TARGET
* Add --debug_info flag to iOS and macOS builds for building with debug info
* jas_stream: Add definition for L_tmpnam if missing
uClibc-ng for some reason does not provide a definition when some
deprecated APIs are disabled. Value taken from the musl libc.
* 3rdparty: move uClibc-ng workaround into config file
Detected by clang trunk:
```
opencv/modules/core/src/ocl.cpp:4337:37: warning: object backing the pointer will be destroyed at the end of the full-expression [-Wdangling]
CV_OCL_CHECK_RESULT(retval, cv::format("clCreateBuffer(capacity=%lld) => %p", (long long int)entry.capacity_, (void*)entry.clBuffer_).c_str());
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
opencv/modules/core/src/ocl.cpp:193:42: note: expanded from macro 'CV_OCL_CHECK_RESULT'
if (0) { const char* msg_ = (msg); CV_UNUSED(msg_); /* ensure const char* type (cv::String without c_str()) */ } \
```
because `cv::format` yields a temporary std::string, and thus `msg_` points to a destroyed buffer.
* Fix the detection of XIMEA on Windows (when it has been installed by another user with administrative privileges, for example).
* Change the flow: we first try HKEY_CURRENT_USER key and, if empty, then try HKEY_LOCAL_MACHINE
Use 4x FMA chains to sum on SIMD 128 FP64 targets. On
x86 this showed about 1.4x improvement.
For PPC, do a full multiply (32x32->64b), convert to DP
then accumulate. This may be slightly less precise for
some inputs. But is 1.5x faster than the above which
is about 1.5x than the FMA above for ~2.5x speedup.
ChipKerchner
Alexander Alekhin
Vitaly Tuzov
Maksim Shabunin
atinfinity
Dmitry Kurtaev
Alexander Alekhin
Giles Payne
Ilya Lavrenov
Andrey Golubev
Paul E. Murphy
Kazuma Furuhashi
Prakhar Varshney
dab0bby
Rosen Penev
Zyrin
Matthias Gehre
Philippe FOUBERT
xitong
craterkamath