Determining size of off64_t failed with the following output: Change Dir: F:/assimp/BLD/Engine/lib/assimp/BuildLib/CMakeFiles/CMakeTmp Run Build Command:"C:/Program Files (x86)/MSBuild/14.0/bin/MSBuild.exe" "cmTC_243db.vcxproj" "/p:Configuration=Debug" "/p:VisualStudioVersion=14.0" Microsoft (R) Build Engine version 14.0.25123.0 Copyright (C) Microsoft Corporation. All rights reserved. Build started 11/12/2018 12:46:57 PM. Project "F:\assimp\BLD\Engine\lib\assimp\BuildLib\CMakeFiles\CMakeTmp\cmTC_243db.vcxproj" on node 1 (default targets). PrepareForBuild: Creating directory "cmTC_243db.dir\Debug\". Creating directory "F:\assimp\BLD\Engine\lib\assimp\BuildLib\CMakeFiles\CMakeTmp\Debug\". Creating directory "cmTC_243db.dir\Debug\cmTC_243db.tlog\". InitializeBuildStatus: Creating "cmTC_243db.dir\Debug\cmTC_243db.tlog\unsuccessfulbuild" because "AlwaysCreate" was specified. ClCompile: C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\x86_amd64\CL.exe /c /Zi /W3 /WX- /Od /Ob0 /D WIN32 /D _WINDOWS /D _LARGEFILE64_SOURCE=1 /D HAVE_SYS_TYPES_H /D HAVE_STDINT_H /D HAVE_STDDEF_H /D "CMAKE_INTDIR=\"Debug\"" /D _MBCS /Gm- /RTC1 /MDd /GS /fp:precise /Zc:wchar_t /Zc:forScope /Zc:inline /Fo"cmTC_243db.dir\Debug\\" /Fd"cmTC_243db.dir\Debug\vc140.pdb" /Gd /TC /errorReport:queue F:\assimp\BLD\Engine\lib\assimp\BuildLib\CMakeFiles\CheckTypeSize\OFF64_T.c Microsoft (R) C/C++ Optimizing Compiler Version 19.00.23918 for x64 Copyright (C) Microsoft Corporation. All rights reserved. cl /c /Zi /W3 /WX- /Od /Ob0 /D WIN32 /D _WINDOWS /D _LARGEFILE64_SOURCE=1 /D HAVE_SYS_TYPES_H /D HAVE_STDINT_H /D HAVE_STDDEF_H /D "CMAKE_INTDIR=\"Debug\"" /D _MBCS /Gm- /RTC1 /MDd /GS /fp:precise /Zc:wchar_t /Zc:forScope /Zc:inline /Fo"cmTC_243db.dir\Debug\\" /Fd"cmTC_243db.dir\Debug\vc140.pdb" /Gd /TC /errorReport:queue F:\assimp\BLD\Engine\lib\assimp\BuildLib\CMakeFiles\CheckTypeSize\OFF64_T.c OFF64_T.c F:\assimp\BLD\Engine\lib\assimp\BuildLib\CMakeFiles\CheckTypeSize\OFF64_T.c(25): error C2065: 'off64_t': undeclared identifier [F:\assimp\BLD\Engine\lib\assimp\BuildLib\CMakeFiles\CMakeTmp\cmTC_243db.vcxproj] F:\assimp\BLD\Engine\lib\assimp\BuildLib\CMakeFiles\CheckTypeSize\OFF64_T.c(26): error C2065: 'off64_t': undeclared identifier [F:\assimp\BLD\Engine\lib\assimp\BuildLib\CMakeFiles\CMakeTmp\cmTC_243db.vcxproj] F:\assimp\BLD\Engine\lib\assimp\BuildLib\CMakeFiles\CheckTypeSize\OFF64_T.c(27): error C2065: 'off64_t': undeclared identifier [F:\assimp\BLD\Engine\lib\assimp\BuildLib\CMakeFiles\CMakeTmp\cmTC_243db.vcxproj] F:\assimp\BLD\Engine\lib\assimp\BuildLib\CMakeFiles\CheckTypeSize\OFF64_T.c(28): error C2065: 'off64_t': undeclared identifier [F:\assimp\BLD\Engine\lib\assimp\BuildLib\CMakeFiles\CMakeTmp\cmTC_243db.vcxproj] F:\assimp\BLD\Engine\lib\assimp\BuildLib\CMakeFiles\CheckTypeSize\OFF64_T.c(29): error C2065: 'off64_t': undeclared identifier [F:\assimp\BLD\Engine\lib\assimp\BuildLib\CMakeFiles\CMakeTmp\cmTC_243db.vcxproj] Done Building Project "F:\assimp\BLD\Engine\lib\assimp\BuildLib\CMakeFiles\CMakeTmp\cmTC_243db.vcxproj" (default targets) -- FAILED. Build FAILED. "F:\assimp\BLD\Engine\lib\assimp\BuildLib\CMakeFiles\CMakeTmp\cmTC_243db.vcxproj" (default target) (1) -> (ClCompile target) -> F:\assimp\BLD\Engine\lib\assimp\BuildLib\CMakeFiles\CheckTypeSize\OFF64_T.c(25): error C2065: 'off64_t': undeclared identifier [F:\assimp\BLD\Engine\lib\assimp\BuildLib\CMakeFiles\CMakeTmp\cmTC_243db.vcxproj] F:\assimp\BLD\Engine\lib\assimp\BuildLib\CMakeFiles\CheckTypeSize\OFF64_T.c(26): error C2065: 'off64_t': undeclared identifier [F:\assimp\BLD\Engine\lib\assimp\BuildLib\CMakeFiles\CMakeTmp\cmTC_243db.vcxproj] F:\assimp\BLD\Engine\lib\assimp\BuildLib\CMakeFiles\CheckTypeSize\OFF64_T.c(27): error C2065: 'off64_t': undeclared identifier [F:\assimp\BLD\Engine\lib\assimp\BuildLib\CMakeFiles\CMakeTmp\cmTC_243db.vcxproj] F:\assimp\BLD\Engine\lib\assimp\BuildLib\CMakeFiles\CheckTypeSize\OFF64_T.c(28): error C2065: 'off64_t': undeclared identifier [F:\assimp\BLD\Engine\lib\assimp\BuildLib\CMakeFiles\CMakeTmp\cmTC_243db.vcxproj] F:\assimp\BLD\Engine\lib\assimp\BuildLib\CMakeFiles\CheckTypeSize\OFF64_T.c(29): error C2065: 'off64_t': undeclared identifier [F:\assimp\BLD\Engine\lib\assimp\BuildLib\CMakeFiles\CMakeTmp\cmTC_243db.vcxproj] 0 Warning(s) 5 Error(s) Time Elapsed 00:00:01.01 F:/assimp/BLD/Engine/lib/assimp/BuildLib/CMakeFiles/CheckTypeSize/OFF64_T.c: #include #include #include #undef KEY #if defined(__i386) # define KEY '_','_','i','3','8','6' #elif defined(__x86_64) # define KEY '_','_','x','8','6','_','6','4' #elif defined(__ppc__) # define KEY '_','_','p','p','c','_','_' #elif defined(__ppc64__) # define KEY '_','_','p','p','c','6','4','_','_' #elif defined(__aarch64__) # define KEY '_','_','a','a','r','c','h','6','4','_','_' #elif defined(__ARM_ARCH_7A__) # define KEY '_','_','A','R','M','_','A','R','C','H','_','7','A','_','_' #elif defined(__ARM_ARCH_7S__) # define KEY '_','_','A','R','M','_','A','R','C','H','_','7','S','_','_' #endif #define SIZE (sizeof(off64_t)) char info_size[] = {'I', 'N', 'F', 'O', ':', 's','i','z','e','[', ('0' + ((SIZE / 10000)%10)), ('0' + ((SIZE / 1000)%10)), ('0' + ((SIZE / 100)%10)), ('0' + ((SIZE / 10)%10)), ('0' + (SIZE % 10)), ']', #ifdef KEY ' ','k','e','y','[', KEY, ']', #endif '\0'}; #ifdef __CLASSIC_C__ int main(argc, argv) int argc; char *argv[]; #else int main(int argc, char *argv[]) #endif { int require = 0; require += info_size[argc]; (void)argv; return require; } Determining if the function fseeko exists failed with the following output: Change Dir: F:/assimp/BLD/Engine/lib/assimp/BuildLib/CMakeFiles/CMakeTmp Run Build Command:"C:/Program Files (x86)/MSBuild/14.0/bin/MSBuild.exe" "cmTC_0e7ff.vcxproj" "/p:Configuration=Debug" "/p:VisualStudioVersion=14.0" Microsoft (R) Build Engine version 14.0.25123.0 Copyright (C) Microsoft Corporation. All rights reserved. Build started 11/12/2018 12:47:00 PM. Project "F:\assimp\BLD\Engine\lib\assimp\BuildLib\CMakeFiles\CMakeTmp\cmTC_0e7ff.vcxproj" on node 1 (default targets). PrepareForBuild: Creating directory "cmTC_0e7ff.dir\Debug\". Creating directory "F:\assimp\BLD\Engine\lib\assimp\BuildLib\CMakeFiles\CMakeTmp\Debug\". Creating directory "cmTC_0e7ff.dir\Debug\cmTC_0e7ff.tlog\". InitializeBuildStatus: Creating "cmTC_0e7ff.dir\Debug\cmTC_0e7ff.tlog\unsuccessfulbuild" because "AlwaysCreate" was specified. ClCompile: C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\x86_amd64\CL.exe /c /Zi /W3 /WX- /Od /Ob0 /D WIN32 /D _WINDOWS /D CHECK_FUNCTION_EXISTS=fseeko /D "CMAKE_INTDIR=\"Debug\"" /D _MBCS /Gm- /RTC1 /MDd /GS /fp:precise /Zc:wchar_t /Zc:forScope /Zc:inline /Fo"cmTC_0e7ff.dir\Debug\\" /Fd"cmTC_0e7ff.dir\Debug\vc140.pdb" /Gd /TC /errorReport:queue "C:\Program Files\CMake\share\cmake-3.10\Modules\CheckFunctionExists.c" Microsoft (R) C/C++ Optimizing Compiler Version 19.00.23918 for x64 Copyright (C) Microsoft Corporation. All rights reserved. cl /c /Zi /W3 /WX- /Od /Ob0 /D WIN32 /D _WINDOWS /D CHECK_FUNCTION_EXISTS=fseeko /D "CMAKE_INTDIR=\"Debug\"" /D _MBCS /Gm- /RTC1 /MDd /GS /fp:precise /Zc:wchar_t /Zc:forScope /Zc:inline /Fo"cmTC_0e7ff.dir\Debug\\" /Fd"cmTC_0e7ff.dir\Debug\vc140.pdb" /Gd /TC /errorReport:queue "C:\Program Files\CMake\share\cmake-3.10\Modules\CheckFunctionExists.c" CheckFunctionExists.c Link: C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\x86_amd64\link.exe /ERRORREPORT:QUEUE /OUT:"F:\assimp\BLD\Engine\lib\assimp\BuildLib\CMakeFiles\CMakeTmp\Debug\cmTC_0e7ff.exe" /INCREMENTAL /NOLOGO kernel32.lib user32.lib gdi32.lib winspool.lib shell32.lib ole32.lib oleaut32.lib uuid.lib comdlg32.lib advapi32.lib /MANIFEST /MANIFESTUAC:"level='asInvoker' uiAccess='false'" /manifest:embed /DEBUG /PDB:"F:/assimp/BLD/Engine/lib/assimp/BuildLib/CMakeFiles/CMakeTmp/Debug/cmTC_0e7ff.pdb" /SUBSYSTEM:CONSOLE /TLBID:1 /DYNAMICBASE /NXCOMPAT /IMPLIB:"F:/assimp/BLD/Engine/lib/assimp/BuildLib/CMakeFiles/CMakeTmp/Debug/cmTC_0e7ff.lib" /MACHINE:X64 /machine:x64 cmTC_0e7ff.dir\Debug\CheckFunctionExists.obj CheckFunctionExists.obj : error LNK2019: unresolved external symbol fseeko referenced in function main [F:\assimp\BLD\Engine\lib\assimp\BuildLib\CMakeFiles\CMakeTmp\cmTC_0e7ff.vcxproj] F:\assimp\BLD\Engine\lib\assimp\BuildLib\CMakeFiles\CMakeTmp\Debug\cmTC_0e7ff.exe : fatal error LNK1120: 1 unresolved externals [F:\assimp\BLD\Engine\lib\assimp\BuildLib\CMakeFiles\CMakeTmp\cmTC_0e7ff.vcxproj] Done Building Project "F:\assimp\BLD\Engine\lib\assimp\BuildLib\CMakeFiles\CMakeTmp\cmTC_0e7ff.vcxproj" (default targets) -- FAILED. Build FAILED. "F:\assimp\BLD\Engine\lib\assimp\BuildLib\CMakeFiles\CMakeTmp\cmTC_0e7ff.vcxproj" (default target) (1) -> (Link target) -> CheckFunctionExists.obj : error LNK2019: unresolved external symbol fseeko referenced in function main [F:\assimp\BLD\Engine\lib\assimp\BuildLib\CMakeFiles\CMakeTmp\cmTC_0e7ff.vcxproj] F:\assimp\BLD\Engine\lib\assimp\BuildLib\CMakeFiles\CMakeTmp\Debug\cmTC_0e7ff.exe : fatal error LNK1120: 1 unresolved externals [F:\assimp\BLD\Engine\lib\assimp\BuildLib\CMakeFiles\CMakeTmp\cmTC_0e7ff.vcxproj] 0 Warning(s) 2 Error(s) Time Elapsed 00:00:06.23 Determining if the include file unistd.h exists failed with the following output: Change Dir: F:/assimp/BLD/Engine/lib/assimp/BuildLib/CMakeFiles/CMakeTmp Run Build Command:"C:/Program Files (x86)/MSBuild/14.0/bin/MSBuild.exe" "cmTC_d0040.vcxproj" "/p:Configuration=Debug" "/p:VisualStudioVersion=14.0" Microsoft (R) Build Engine version 14.0.25123.0 Copyright (C) Microsoft Corporation. All rights reserved. Build started 11/12/2018 12:47:07 PM. Project "F:\assimp\BLD\Engine\lib\assimp\BuildLib\CMakeFiles\CMakeTmp\cmTC_d0040.vcxproj" on node 1 (default targets). PrepareForBuild: Creating directory "cmTC_d0040.dir\Debug\". Creating directory "F:\assimp\BLD\Engine\lib\assimp\BuildLib\CMakeFiles\CMakeTmp\Debug\". Creating directory "cmTC_d0040.dir\Debug\cmTC_d0040.tlog\". InitializeBuildStatus: Creating "cmTC_d0040.dir\Debug\cmTC_d0040.tlog\unsuccessfulbuild" because "AlwaysCreate" was specified. ClCompile: C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\x86_amd64\CL.exe /c /Zi /W3 /WX- /Od /Ob0 /D WIN32 /D _WINDOWS /D "CMAKE_INTDIR=\"Debug\"" /D _MBCS /Gm- /RTC1 /MDd /GS /fp:precise /Zc:wchar_t /Zc:forScope /Zc:inline /Fo"cmTC_d0040.dir\Debug\\" /Fd"cmTC_d0040.dir\Debug\vc140.pdb" /Gd /TC /errorReport:queue F:\assimp\BLD\Engine\lib\assimp\BuildLib\CMakeFiles\CMakeTmp\CheckIncludeFile.c Microsoft (R) C/C++ Optimizing Compiler Version 19.00.23918 for x64 Copyright (C) Microsoft Corporation. All rights reserved. cl /c /Zi /W3 /WX- /Od /Ob0 /D WIN32 /D _WINDOWS /D "CMAKE_INTDIR=\"Debug\"" /D _MBCS /Gm- /RTC1 /MDd /GS /fp:precise /Zc:wchar_t /Zc:forScope /Zc:inline /Fo"cmTC_d0040.dir\Debug\\" /Fd"cmTC_d0040.dir\Debug\vc140.pdb" /Gd /TC /errorReport:queue F:\assimp\BLD\Engine\lib\assimp\BuildLib\CMakeFiles\CMakeTmp\CheckIncludeFile.c CheckIncludeFile.c F:\assimp\BLD\Engine\lib\assimp\BuildLib\CMakeFiles\CMakeTmp\CheckIncludeFile.c(1): fatal error C1083: Cannot open include file: 'unistd.h': No such file or directory [F:\assimp\BLD\Engine\lib\assimp\BuildLib\CMakeFiles\CMakeTmp\cmTC_d0040.vcxproj] Done Building Project "F:\assimp\BLD\Engine\lib\assimp\BuildLib\CMakeFiles\CMakeTmp\cmTC_d0040.vcxproj" (default targets) -- FAILED. Build FAILED. "F:\assimp\BLD\Engine\lib\assimp\BuildLib\CMakeFiles\CMakeTmp\cmTC_d0040.vcxproj" (default target) (1) -> (ClCompile target) -> F:\assimp\BLD\Engine\lib\assimp\BuildLib\CMakeFiles\CMakeTmp\CheckIncludeFile.c(1): fatal error C1083: Cannot open include file: 'unistd.h': No such file or directory [F:\assimp\BLD\Engine\lib\assimp\BuildLib\CMakeFiles\CMakeTmp\cmTC_d0040.vcxproj] 0 Warning(s) 1 Error(s) Time Elapsed 00:00:01.52