C++ How can I build opencv for vs 2015 x86 - c++

Question

I want to use opencv in my VS2015 C++ project and I need it exactly for x86 platform, not x64.
I used CMake as advised everywhere in the internet. What is more I tried to configure several versions of opencv - 2.4.9; 3.0.0; 3.1.0
And on each configuring and generating through CMake I get a lot of errors.
Here's a log from CMake gui after configuring:
CMake Deprecation Warning at CMakeLists.txt:69 (cmake_policy):
The OLD behavior for policy CMP0022 will be removed from a future version
of CMake.
The cmake-policies(7) manual explains that the OLD behaviors of all
policies are deprecated and that a policy should be set to OLD only under
specific short-term circumstances. Projects should be ported to the NEW
behavior and not rely on setting a policy to OLD.
CMake Deprecation Warning at CMakeLists.txt:74 (cmake_policy):
The OLD behavior for policy CMP0026 will be removed from a future version
of CMake.
The cmake-policies(7) manual explains that the OLD behaviors of all
policies are deprecated and that a policy should be set to OLD only under
specific short-term circumstances. Projects should be ported to the NEW
behavior and not rely on setting a policy to OLD.
The CXX compiler identification is MSVC 19.0.23506.0
The C compiler identification is MSVC 19.0.23506.0
Check for working CXX compiler: C:/Program Files (x86)/Microsoft Visual Studio 14.0/VC/bin/cl.exe
Check for working CXX compiler: C:/Program Files (x86)/Microsoft Visual Studio 14.0/VC/bin/cl.exe -- works
Detecting CXX compiler ABI info
Detecting CXX compiler ABI info - done
Detecting CXX compile features
Detecting CXX compile features - done
Check for working C compiler: C:/Program Files (x86)/Microsoft Visual Studio 14.0/VC/bin/cl.exe
Check for working C compiler: C:/Program Files (x86)/Microsoft Visual Studio 14.0/VC/bin/cl.exe -- works
Detecting C compiler ABI info
Detecting C compiler ABI info - done
Detecting C compile features
Detecting C compile features - done
Performing Test HAVE_CXX_FSIGNED_CHAR
Performing Test HAVE_CXX_FSIGNED_CHAR - Failed
Performing Test HAVE_C_FSIGNED_CHAR
Performing Test HAVE_C_FSIGNED_CHAR - Failed
Check if the system is big endian
Searching 16 bit integer
Looking for sys/types.h
Looking for sys/types.h - found
Looking for stdint.h
Looking for stdint.h - found
Looking for stddef.h
Looking for stddef.h - found
Check size of unsigned short
Check size of unsigned short - done
Using unsigned short
Check if the system is big endian - little endian
Looking for fseeko
Looking for fseeko - not found
Looking for unistd.h
Looking for unistd.h - not found
Check size of off64_t
Check size of off64_t - failed
Looking for assert.h
Looking for assert.h - found
Looking for fcntl.h
Looking for fcntl.h - found
Looking for io.h
Looking for io.h - found
Looking for jbg_newlen
Looking for jbg_newlen - not found
Looking for mmap
Looking for mmap - not found
Looking for search.h
Looking for search.h - found
Looking for string.h
Looking for string.h - found
Looking for unistd.h
Looking for unistd.h - not found
CMake Warning at 3rdparty/ippicv/downloader.cmake:54 (message):
ICV: Local copy of ICV package has invalid MD5 hash:
d41d8cd98f00b204e9800998ecf8427e (expected:
b59f865d1ba16e8c84124e19d78eec57)
Call Stack (most recent call first):
3rdparty/ippicv/downloader.cmake:108 (_icv_downloader)
cmake/OpenCVFindIPP.cmake:235 (include)
cmake/OpenCVFindLibsPerf.cmake:12 (include)
CMakeLists.txt:526 (include)
ICV: Downloading ippicv_windows_20141027.zip...
CMake Error at 3rdparty/ippicv/downloader.cmake:71 (file):
file DOWNLOAD HASH mismatch
for file: [D:/opencv-3.0/opencv/sources/3rdparty/ippicv/downloads/windows-b59f865d1ba16e8c84124e19d78eec57/ippicv_windows_20141027.zip]
expected hash: [b59f865d1ba16e8c84124e19d78eec57]
actual hash: [d41d8cd98f00b204e9800998ecf8427e]
status: [6;"Couldn't resolve host name"]
Call Stack (most recent call first):
3rdparty/ippicv/downloader.cmake:108 (_icv_downloader)
cmake/OpenCVFindIPP.cmake:235 (include)
cmake/OpenCVFindLibsPerf.cmake:12 (include)
CMakeLists.txt:526 (include)
CMake Error at 3rdparty/ippicv/downloader.cmake:75 (message):
ICV: Failed to download ICV package: ippicv_windows_20141027.zip.
Status=6;"Couldn't resolve host name"
Call Stack (most recent call first):
3rdparty/ippicv/downloader.cmake:108 (_icv_downloader)
cmake/OpenCVFindIPP.cmake:235 (include)
cmake/OpenCVFindLibsPerf.cmake:12 (include)
CMakeLists.txt:526 (include)
Configuring incomplete, errors occurred!
See also "D:/opencv-build/CMakeFiles/CMakeOutput.log".
See also "D:/opencv-build/CMakeFiles/CMakeError.log".
And this log is after generating:
CMake Deprecation Warning at CMakeLists.txt:69 (cmake_policy):
The OLD behavior for policy CMP0022 will be removed from a future version
of CMake.
The cmake-policies(7) manual explains that the OLD behaviors of all
policies are deprecated and that a policy should be set to OLD only under
specific short-term circumstances. Projects should be ported to the NEW
behavior and not rely on setting a policy to OLD.
CMake Deprecation Warning at CMakeLists.txt:74 (cmake_policy):
The OLD behavior for policy CMP0026 will be removed from a future version
of CMake.
The cmake-policies(7) manual explains that the OLD behaviors of all
policies are deprecated and that a policy should be set to OLD only under
specific short-term circumstances. Projects should be ported to the NEW
behavior and not rely on setting a policy to OLD.
CMake Warning at 3rdparty/ippicv/downloader.cmake:54 (message):
ICV: Local copy of ICV package has invalid MD5 hash:
d41d8cd98f00b204e9800998ecf8427e (expected:
b59f865d1ba16e8c84124e19d78eec57)
Call Stack (most recent call first):
3rdparty/ippicv/downloader.cmake:108 (_icv_downloader)
cmake/OpenCVFindIPP.cmake:235 (include)
cmake/OpenCVFindLibsPerf.cmake:12 (include)
CMakeLists.txt:526 (include)
ICV: Downloading ippicv_windows_20141027.zip...
CMake Error at 3rdparty/ippicv/downloader.cmake:71 (file):
file DOWNLOAD HASH mismatch
for file: [D:/opencv-3.0/opencv/sources/3rdparty/ippicv/downloads/windows-b59f865d1ba16e8c84124e19d78eec57/ippicv_windows_20141027.zip]
expected hash: [b59f865d1ba16e8c84124e19d78eec57]
actual hash: [d41d8cd98f00b204e9800998ecf8427e]
status: [6;"Couldn't resolve host name"]
Call Stack (most recent call first):
3rdparty/ippicv/downloader.cmake:108 (_icv_downloader)
cmake/OpenCVFindIPP.cmake:235 (include)
cmake/OpenCVFindLibsPerf.cmake:12 (include)
CMakeLists.txt:526 (include)
CMake Error at 3rdparty/ippicv/downloader.cmake:75 (message):
ICV: Failed to download ICV package: ippicv_windows_20141027.zip.
Status=6;"Couldn't resolve host name"
Call Stack (most recent call first):
3rdparty/ippicv/downloader.cmake:108 (_icv_downloader)
cmake/OpenCVFindIPP.cmake:235 (include)
cmake/OpenCVFindLibsPerf.cmake:12 (include)
CMakeLists.txt:526 (include)
Configuring incomplete, errors occurred!
See also "D:/opencv-build/CMakeFiles/CMakeOutput.log".
See also "D:/opencv-build/CMakeFiles/CMakeError.log".
Both CMakeOutput.log and CMakeError.log are not readable. They are full of unreadable characters.
How can I get this vc14 x86 version of opencv!?
I'm stuck.

Answer 1

In OpenCVConfig.cmake,
if(MSVC)
message("CMAKE_CL_64 is ${CMAKE_CL_64}")
if(CMAKE_CL_64)
set(OpenCV_ARCH x64)
elseif((CMAKE_GENERATOR MATCHES "ARM") OR ("${arch_hint}" STREQUAL "ARM") OR (CMAKE_VS_EFFECTIVE_PLATFORMS MATCHES "ARM|arm"))
# see Modules/CmakeGenericSystem.cmake
set(OpenCV_ARCH ARM)
else()
set(OpenCV_ARCH x86)
endif()