[LLVMdev] Building Python with clang-cl

[Russell Wallace]

Taking another shot at building Python with clang-cl, this time going by
the SVN version, using the following commands

cd \python-2.7.10\pcbuild
rd /q /s amd64
rd /q /s win32-temp-debug
rd /q /s win32-temp-release
rd /q /s x64-temp-debug
rd /q /s x64-temp-release
set Platform=X64
msbuild /t:clean,build /p:Configuration=Release /p:CLToolExe=clang-cl.exe
/p:CLToolPath=c:\llvm-svn\build\Release\bin\ /p:TrackFileAccess=false
/p:Platform="x64" /fileLogger pcbuild.sln

It seems to generate an invalid object file from one particular source
file, kill_python.c. This is the output when compiling that file

  c:\llvm-svn\build\Release\bin\clang-cl.exe /c /I..\Include /I..\PC /Zi
/nologo /W3 /WX- /O2 /Ob1 /Oi /GL /D _WIN64 /D _M_X64 /D NDEBUG /D _WIN32
/GF /Gm- /MT /GS /Gy /fp:precise /Zc:wchar_t /Zc:forScope
/Fo"C:\Python-2.7.10\PCbuild\x64-temp-Release\kill_python\\"
/Fd"C:\Python-2.7.10\PCbuild\x64-temp-Release\kill_python\vc120.pdb" /Gd
/TC /errorReport:queue /USECL:MS_OPTERON /GS- kill_python.c
clang-cl.exe : warning : argument unused during compilation: '/Gm-'
[C:\Python-2.7.10\PCbuild\kill_python.vcxproj]
clang-cl.exe : warning : argument unused during compilation: '/GS'
[C:\Python-2.7.10\PCbuild\kill_python.vcxproj]
  In file included from <built-in>:299:
<command line>(6,12): warning : extra tokens at end of #undef directive
[-Wextra-tokens] [C:\Python-2.7.10\PCbuild\kill_python.vcxproj]
  #undef SECL:MS_OPTERON
             ^
             //
kill_python.c(46,60): warning : format specifies type 'int' but the
argument has type 'DWORD' (aka 'unsigned long') [-Wformat]
[C:\Python-2.7.10\PCbuild\kill_python.vcxproj]
          printf("CreateToolhelp32Snapshot[1] failed: %d\n",
GetLastError());
                                                      ~~     ^~~~~~~~~~~~~~
                                                      %lu
kill_python.c(51,50): warning : format specifies type 'int' but the
argument has type 'DWORD' (aka 'unsigned long') [-Wformat]
[C:\Python-2.7.10\PCbuild\kill_python.vcxproj]
          printf("Module32FirstW[1] failed: %d\n", GetLastError());
                                            ~~     ^~~~~~~~~~~~~~
                                            %lu
kill_python.c(73,9): warning : comparison of array 'path' equal to a null
pointer is always false [-Wtautological-pointer-compare]
[C:\Python-2.7.10\PCbuild\kill_python.vcxproj]
      if (path == NULL) {
          ^~~~    ~~~~
kill_python.c(93,60): warning : format specifies type 'int' but the
argument has type 'DWORD' (aka 'unsigned long') [-Wformat]
[C:\Python-2.7.10\PCbuild\kill_python.vcxproj]
          printf("CreateToolhelp32Snapshot[2] failed: %d\n",
GetLastError());
                                                      ~~     ^~~~~~~~~~~~~~
                                                      %lu
kill_python.c(98,48): warning : format specifies type 'int' but the
argument has type 'DWORD' (aka 'unsigned long') [-Wformat]
[C:\Python-2.7.10\PCbuild\kill_python.vcxproj]
          printf("Process32FirstW failed: %d\n", GetLastError());
                                          ~~     ^~~~~~~~~~~~~~
                                          %lu
kill_python.c(132,54): warning : format specifies type 'int' but the
argument has type 'DWORD' (aka 'unsigned long') [-Wformat]
[C:\Python-2.7.10\PCbuild\kill_python.vcxproj]
              printf("Module32FirstW[2] failed: %d\n", GetLastError());
                                                ~~     ^~~~~~~~~~~~~~
                                                %lu
kill_python.c(150,52): warning : format specifies type 'int' but the
argument has type 'DWORD' (aka 'unsigned long') [-Wformat]
[C:\Python-2.7.10\PCbuild\kill_python.vcxproj]
                  printf("OpenProcess failed: %d\n", GetLastError());
                                              ~~     ^~~~~~~~~~~~~~
                                              %lu
kill_python.c(157,57): warning : format specifies type 'int' but the
argument has type 'DWORD' (aka 'unsigned long') [-Wformat]
[C:\Python-2.7.10\PCbuild\kill_python.vcxproj]
                  printf("TerminateProcess failed: %d\n", GetLastError());
                                                   ~~     ^~~~~~~~~~~~~~
                                                   %lu
  9 warnings generated.

And the link error message

  C:\Python-2.7.10\PCbuild\x64-temp-Release\kill_python\kill_python.obj :
fatal error LNK1107: invalid or corrupt file: cannot read at 0x1A44
[C:\Python-2.7.10\PCbuild\kill_python.vcxproj]

I tried dumpbin on kill_python.obj, and dumpbin agrees it's an invalid
object file.
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