When compiling a very small and simple C++ program (which took 6 seconds), i profiled the execution. cc1plus was speding a lot of time trying to create .exe-files AND .lnk-files.
This was the command-line: g++ -c -O0 -DGTEST_DONT_DEFINE_FAIL -std=gnu++14 -Iw64 -Icommon/freertos/include -Iw64/config/ -Icommon -Icommon/dali -Icommon/debug -Icommon/config -isystem ../Tools/googletest/include -isystem ../Tools/googlemock/include -DUNITTEST -g -Wall -Werror -pthread unittest/block_hvac_unittest.cc -o obj_unit_linux/unittest/block_hvac_unittest.o I used procmon to capture all system-calls done. This is a part of what happened: (search for .exe AND .lnk) Why does the preprocessor try to create these files (my command is just trying to compile (no linking)) ? 08:25:49.3879979 cc1plus.exe 7256 QueryAllInformationFile C:\cygwin64\lib\gcc\x86_64-w64-mingw32\6.4.0\include\c++\backward BUFFER OVERFLOW CreationTime: 03/11/2017 13:52:16, LastAccessTime: 03/11/2017 13:52:16, LastWriteTime: 03/11/2017 13:52:16, ChangeTime: 03/11/2017 13:52:16, FileAttributes: DCNCI, AllocationSize: 4,096, EndOfFile: 4,096, NumberOfLinks: 1, DeletePending: False, Directory: True, IndexNumber: 0xe000000065c3f, EaSize: 0, Access: Read EA, Read Attributes, Read Control, Position: 0, Mode: , AlignmentRequirement: Word 08:25:49.3880077 cc1plus.exe 7256 CloseFile C:\cygwin64\lib\gcc\x86_64-w64-mingw32\6.4.0\include\c++\backward SUCCESS 08:25:49.3880800 cc1plus.exe 7256 CreateFile C:\cygwin64\lib\gcc\x86_64-w64-mingw32\6.4.0\include\c++\backward\clwbintrin.h NAME NOT FOUND Desired Access: Read EA, Read Attributes, Read Control, Disposition: Open, Options: Open Reparse Point, Attributes: n/a, ShareMode: Read, Write, Delete, AllocationSize: n/a 08:25:49.3881391 cc1plus.exe 7256 CreateFile C:\cygwin64\lib\gcc\x86_64-w64-mingw32\6.4.0\include\c++\backward\clwbintrin.h.exe NAME NOT FOUND Desired Access: Read EA, Read Attributes, Read Control, Disposition: Open, Options: Open Reparse Point, Attributes: n/a, ShareMode: Read, Write, Delete, AllocationSize: n/a 08:25:49.3882166 cc1plus.exe 7256 CreateFile C:\cygwin64\lib\gcc\x86_64-w64-mingw32\6.4.0\include\c++\backward\clwbintrin.h.lnk NAME NOT FOUND Desired Access: Read EA, Read Attributes, Read Control, Disposition: Open, Options: Open Reparse Point, Attributes: n/a, ShareMode: Read, Write, Delete, AllocationSize: n/a 08:25:49.3882946 cc1plus.exe 7256 CreateFile C:\cygwin64\lib\gcc\x86_64-w64-mingw32\6.4.0\include\c++\backward\clwbintrin.h.exe.lnk NAME NOT FOUND Desired Access: Read EA, Read Attributes, Read Control, Disposition: Open, Options: Open Reparse Point, Attributes: n/a, ShareMode: Read, Write, Delete, AllocationSize: n/a 08:25:49.3883608 cc1plus.exe 7256 CreateFile C:\cygwin64\lib\gcc\x86_64-w64-mingw32\6.4.0\include\c++\backward SUCCESS Desired Access: Read EA, Read Attributes, Read Control, Disposition: Open, Options: Open Reparse Point, Attributes: n/a, ShareMode: Read, Write, Delete, AllocationSize: n/a, OpenResult: Opened 08:25:49.3883767 cc1plus.exe 7256 QueryInformationVolume C:\cygwin64\lib\gcc\x86_64-w64-mingw32\6.4.0\include\c++\backward SUCCESS VolumeCreationTime: 20/11/2015 20:57:08, VolumeSerialNumber: 8CA4-C6C6, SupportsObjects: True, VolumeLabel: OS 08:25:49.3883849 cc1plus.exe 7256 QueryAllInformationFile C:\cygwin64\lib\gcc\x86_64-w64-mingw32\6.4.0\include\c++\backward BUFFER OVERFLOW CreationTime: 03/11/2017 13:52:16, LastAccessTime: 03/11/2017 13:52:16, LastWriteTime: 03/11/2017 13:52:16, ChangeTime: 03/11/2017 13:52:16, FileAttributes: DCNCI, AllocationSize: 4,096, EndOfFile: 4,096, NumberOfLinks: 1, DeletePending: False, Directory: True, IndexNumber: 0xe000000065c3f, EaSize: 0, Access: Read EA, Read Attributes, Read Control, Position: 0, Mode: , AlignmentRequirement: Word 08:25:49.3883957 cc1plus.exe 7256 CloseFile C:\cygwin64\lib\gcc\x86_64-w64-mingw32\6.4.0\include\c++\backward SUCCESS 08:25:49.3884696 cc1plus.exe 7256 CreateFile C:\cygwin64\lib\gcc\x86_64-w64-mingw32\6.4.0\include\c++\backward\clwbintrin.h NAME NOT FOUND Desired Access: Generic Read, Disposition: Open, Options: Synchronous IO Non-Alert, Attributes: n/a, ShareMode: Read, Write, Delete, AllocationSize: n/a 08:25:49.3885450 cc1plus.exe 7256 CreateFile C:\cygwin64\lib\gcc\x86_64-w64-mingw32\6.4.0\include\clwbintrin.h SUCCESS Desired Access: Read EA, Read Attributes, Read Control, Disposition: Open, Options: Open Reparse Point, Attributes: n/a, ShareMode: Read, Write, Delete, AllocationSize: n/a, OpenResult: Opened 08:25:49.3885619 cc1plus.exe 7256 QueryInformationVolume C:\cygwin64\lib\gcc\x86_64-w64-mingw32\6.4.0\include\clwbintrin.h SUCCESS VolumeCreationTime: 20/11/2015 20:57:08, VolumeSerialNumber: 8CA4-C6C6, SupportsObjects: True, VolumeLabel: OS 08:25:49.3885701 cc1plus.exe 7256 QueryAllInformationFile C:\cygwin64\lib\gcc\x86_64-w64-mingw32\6.4.0\include\clwbintrin.h BUFFER OVERFLOW CreationTime: 03/11/2017 13:52:14, LastAccessTime: 03/11/2017 13:52:14, LastWriteTime: 19/10/2017 03:25:55, ChangeTime: 03/11/2017 13:52:14, FileAttributes: ACNCI, AllocationSize: 4,096, EndOfFile: 1,585, NumberOfLinks: 1, DeletePending: False, Directory: False, IndexNumber: 0xb000000065ba0, EaSize: 0, Access: Read EA, Read Attributes, Read Control, Position: 0, Mode: , AlignmentRequirement: Word 08:25:49.3885799 cc1plus.exe 7256 CloseFile C:\cygwin64\lib\gcc\x86_64-w64-mingw32\6.4.0\include\clwbintrin.h SUCCESS 08:25:49.3886558 cc1plus.exe 7256 CreateFile C:\cygwin64\lib\gcc\x86_64-w64-mingw32\6.4.0\include\clwbintrin.h SUCCESS Desired Access: Read EA, Read Attributes, Read Control, Disposition: Open, Options: Open Reparse Point, Attributes: n/a, ShareMode: Read, Write, Delete, AllocationSize: n/a, OpenResult: Opened 08:25:49.3886707 cc1plus.exe 7256 QueryInformationVolume C:\cygwin64\lib\gcc\x86_64-w64-mingw32\6.4.0\include\clwbintrin.h SUCCESS VolumeCreationTime: 20/11/2015 20:57:08, VolumeSerialNumber: 8CA4-C6C6, SupportsObjects: True, VolumeLabel: OS 08:25:49.3886794 cc1plus.exe 7256 QueryAllInformationFile C:\cygwin64\lib\gcc\x86_64-w64-mingw32\6.4.0\include\clwbintrin.h BUFFER OVERFLOW CreationTime: 03/11/2017 13:52:14, LastAccessTime: 03/11/2017 13:52:14, LastWriteTime: 19/10/2017 03:25:55, ChangeTime: 03/11/2017 13:52:14, FileAttributes: ACNCI, AllocationSize: 4,096, EndOfFile: 1,585, NumberOfLinks: 1, DeletePending: False, Directory: False, IndexNumber: 0xb000000065ba0, EaSize: 0, Access: Read EA, Read Attributes, Read Control, Position: 0, Mode: , AlignmentRequirement: Word 08:25:49.3886882 cc1plus.exe 7256 CloseFile C:\cygwin64\lib\gcc\x86_64-w64-mingw32\6.4.0\include\clwbintrin.h SUCCESS 08:25:49.3887626 cc1plus.exe 7256 CreateFile C:\cygwin64\lib\gcc\x86_64-w64-mingw32\6.4.0\include\clwbintrin.h SUCCESS Desired Access: Generic Read, Disposition: Open, Options: Synchronous IO Non-Alert, Attributes: n/a, ShareMode: Read, Write, Delete, AllocationSize: n/a, OpenResult: Opened 08:25:49.3887800 cc1plus.exe 7256 QueryAllInformationFile C:\cygwin64\lib\gcc\x86_64-w64-mingw32\6.4.0\include\clwbintrin.h BUFFER OVERFLOW CreationTime: 03/11/2017 13:52:14, LastAccessTime: 03/11/2017 13:52:14, LastWriteTime: 19/10/2017 03:25:55, ChangeTime: 03/11/2017 13:52:14, FileAttributes: ACNCI, AllocationSize: 4,096, EndOfFile: 1,585, NumberOfLinks: 1, DeletePending: False, Directory: False, IndexNumber: 0xb000000065ba0, EaSize: 0, Access: Generic Read, Position: 0, Mode: Synchronous IO Non-Alert, AlignmentRequirement: Word 08:25:49.3887918 cc1plus.exe 7256 QuerySecurityFile C:\cygwin64\lib\gcc\x86_64-w64-mingw32\6.4.0\include\clwbintrin.h SUCCESS Information: Owner, Group, DACL 08:25:49.3888057 cc1plus.exe 7256 ReadFile C:\cygwin64\lib\gcc\x86_64-w64-mingw32\6.4.0\include\clwbintrin.h SUCCESS Offset: 0, Length: 1,585, Priority: Normal 08:25:49.3888406 cc1plus.exe 7256 CloseFile C:\cygwin64\lib\gcc\x86_64-w64-mingw32\6.4.0\include\clwbintrin.h SUCCESS 08:25:49.3889586 cc1plus.exe 7256 CreateFile C:\Users\mp\bb3\raybaseddev\rtos_rpuck\w64\clflushoptintrin.h NAME NOT FOUND Desired Access: Read EA, Read Attributes, Read Control, Disposition: Open, Options: Open Reparse Point, Attributes: n/a, ShareMode: Read, Write, Delete, AllocationSize: n/a 08:25:49.3890346 cc1plus.exe 7256 CreateFile C:\Users\mp\bb3\raybaseddev\rtos_rpuck\w64\clflushoptintrin.h.exe NAME NOT FOUND Desired Access: Read EA, Read Attributes, Read Control, Disposition: Open, Options: Open Reparse Point, Attributes: n/a, ShareMode: Read, Write, Delete, AllocationSize: n/a 08:25:49.3890987 cc1plus.exe 7256 CreateFile C:\Users\mp\bb3\raybaseddev\rtos_rpuck\w64\clflushoptintrin.h.lnk NAME NOT FOUND Desired Access: Read EA, Read Attributes, Read Control, Disposition: Open, Options: Open Reparse Point, Attributes: n/a, ShareMode: Read, Write, Delete, AllocationSize: n/a 08:25:49.3891639 cc1plus.exe 7256 CreateFile C:\Users\mp\bb3\raybaseddev\rtos_rpuck\w64\clflushoptintrin.h.exe.lnk NAME NOT FOUND Desired Access: Read EA, Read Attributes, Read Control, Disposition: Open, Options: Open Reparse Point, Attributes: n/a, ShareMode: Read, Write, Delete, AllocationSize: n/a 08:25:49.3892337 cc1plus.exe 7256 CreateFile C:\Users\mp\bb3\raybaseddev\rtos_rpuck\w64 SUCCESS Desired Access: Read EA, Read Attributes, Read Control, Disposition: Open, Options: Open Reparse Point, Attributes: n/a, ShareMode: Read, Write, Delete, AllocationSize: n/a, OpenResult: Opened 08:25:49.3892516 cc1plus.exe 7256 QueryInformationVolume C:\Users\mp\bb3\raybaseddev\rtos_rpuck\w64 SUCCESS VolumeCreationTime: 20/11/2015 20:57:08, VolumeSerialNumber: 8CA4-C6C6, SupportsObjects: True, VolumeLabel: OS 08:25:49.3892604 cc1plus.exe 7256 QueryAllInformationFile C:\Users\mp\bb3\raybaseddev\rtos_rpuck\w64 BUFFER OVERFLOW CreationTime: 22/06/2017 06:43:59, LastAccessTime: 07/12/2017 07:47:08, LastWriteTime: 07/12/2017 07:47:08, ChangeTime: 07/12/2017 07:47:08, FileAttributes: D, AllocationSize: 4,096, EndOfFile: 4,096, NumberOfLinks: 1, DeletePending: False, Directory: True, IndexNumber: 0x50000000d2955, EaSize: 0, Access: Read EA, Read Attributes, Read Control, Position: 0, Mode: , AlignmentRequirement: Word 08:25:49.3892696 cc1plus.exe 7256 CloseFile C:\Users\mp\bb3\raybaseddev\rtos_rpuck\w64 SUCCESS 08:25:49.3893476 cc1plus.exe 7256 CreateFile C:\Users\mp\bb3\raybaseddev\rtos_rpuck\w64\clflushoptintrin.h NAME NOT FOUND Desired Access: Read EA, Read Attributes, Read Control, Disposition: Open, Options: Open Reparse Point, Attributes: n/a, ShareMode: Read, Write, Delete, AllocationSize: n/a 08:25:49.3894112 cc1plus.exe 7256 CreateFile C:\Users\mp\bb3\raybaseddev\rtos_rpuck\w64\clflushoptintrin.h.exe NAME NOT FOUND Desired Access: Read EA, Read Attributes, Read Control, Disposition: Open, Options: Open Reparse Point, Attributes: n/a, ShareMode: Read, Write, Delete, AllocationSize: n/a 08:25:49.3894749 cc1plus.exe 7256 CreateFile C:\Users\mp\bb3\raybaseddev\rtos_rpuck\w64\clflushoptintrin.h.lnk NAME NOT FOUND Desired Access: Read EA, Read Attributes, Read Control, Disposition: Open, Options: Open Reparse Point, Attributes: n/a, ShareMode: Read, Write, Delete, AllocationSize: n/a Best regards, Magnus -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
