[cfe-dev] Using Clang 5.0.0 RC2 with MSVC dev builds

Reid Kleckner via cfe-dev cfe-dev at lists.llvm.org
Mon Aug 14 18:17:52 PDT 2017 

> 2. Is there a simple way for me to get Clang 4.0's behavior back, where
having cl.exe and link.exe on my PATH makes Clang automatically detect the
correct -fms-compatibility-version and link.exe to be used?

I haven't figured out what changed, but that definitely seems like a
regression.

On Mon, Aug 14, 2017 at 6:04 PM, Stephan T. Lavavej via cfe-dev <
cfe-dev at lists.llvm.org> wrote:

> Hi Clang devs,
>
> I'm trying to use Clang/LLVM with MSVC's STL in order to keep our code
> conformant and Clang-compatible, and I've encountered a problematic
> behavior change between Clang 4.0 and 5.0.
>
> The only Visual Studio installation on my machine is VS 2013. (I work on
> msvcp140.dll, so my life is easier if I avoid anything that installs it
> system-wide like VS 2015/2017.)
>
> I am NOT using a VS 2013 Developer Command Prompt.
>
> I'm starting with a plain command prompt, using a development build of VS
> 2017 (somewhat beyond 15.3) by adding it to PATH, INCLUDE, and LIB. (I'm
> NOT running an installer for this development build, nor am I modifying the
> registry in any way.) The directory structure of our development build is
> simple, although it does not correspond to the publicly distributed
> installer. On my machine, I have S:\binaries\x86ret, with
> S:\binaries\x86ret\bin\i386\cl.exe containing the x86-native compiler,
> S:\binaries\x86ret\inc\vector containing my favorite header, and
> S:\binaries\x86ret\lib\i386\libcpmt.lib containing the STL's static lib.
> (The CRT's headers and libs are in different directories, but Clang isn't
> having trouble with INCLUDE and LIB.)
>
> I've also used 7-Zip to extract Clang/LLVM 4.0.1 x64-hosted to a
> directory, WITHOUT running an installer.
>
> In this scenario, everything works fine, and we've been testing our STL
> with Clang/LLVM since June (originally 4.0.0, now 4.0.1):
>
> C:\Temp>echo %PATH%
> S:\WCFB01\vctools\nonship\bin\x86;S:\binaries\x86ret\bin\
> i386;S:\WCFB01\vctools\Compiler\Regress\bin\AMD64\xperf;S:\WCFB01\vctools\
> NonShip\ClangLLVM\bin;C:\Temp\Exec;C:\Temp\git\cmd;C:\
> windows\system32;C:\windows;C:\windows\System32\Wbem;C:\windows\System32\
> WindowsPowerShell\v1.0\;C:\Program Files (x86)\Windows Kits\8.1\Windows
> Performance Toolkit\;C:\Program Files\Microsoft SQL
> Server\110\Tools\Binn\;C:\Program Files (x86)\Microsoft
> SDKs\TypeScript\1.0\;C:\Users\stl\AppData\Local\Microsoft\
> WindowsApps;;S:\WCFB01\vctools\Compiler\Regress\bin;
> S:\WCFB01\vctools\Compiler\Regress\bin\AMD64;;S:\WCFB01\tools\perl\bin
>
> C:\Temp>echo %INCLUDE%
> S:\binaries\x86ret\atlmfc\include;S:\binaries\x86ret\
> inc;S:\WCFB01\ExternalApis\Windows\10\sdk\inc;S:\WCFB01\
> ExternalApis\UnifiedCRT\inc;S:\WCFB01\ExternalAPIs\DirectX\
> Jun2010\Include;
>
> C:\Temp>echo %LIB%
> S:\binaries\x86ret\atlmfc\lib\i386;S:\binaries\x86ret\lib\
> i386;S:\WCFB01\ExternalApis\Windows\10\sdk\lib\x86;S:\WCFB01\ExternalApis\
> UnifiedCRT\lib\i386;S:\WCFB01\ExternalApis\NetFX\v4.5\lib\
> x86;S:\WCFB01\ExternalAPIs\DirectX\Jun2010\Lib\x86;
>
> C:\Temp>type meow.cpp
> #include <iostream>
> int main() {
> #ifdef __clang__
>     std::cout << "I am Clang: " << __clang_version__ << "\n";
> #elif defined(_MSC_VER)
>     std::cout << "I am C1XX: " << _MSC_FULL_VER << "\n";
> #else
>     std::cout << "I am something else.\n";
> #endif
> }
>
> C:\Temp>where cl
> S:\binaries\x86ret\bin\i386\cl.exe
>
> C:\Temp>where link
> S:\binaries\x86ret\bin\i386\link.exe
>
> C:\Temp>cl /EHsc /nologo /W4 /MT meow.cpp && meow
> meow.cpp
> I am C1XX: 191125614
>
> C:\Temp>where clang-cl
> S:\WCFB01\vctools\NonShip\ClangLLVM\bin\clang-cl.exe
>
> C:\Temp>clang-cl -v -m32 /EHsc /nologo /W4 /MT meow.cpp && meow
> clang version 4.0.1 (tags/RELEASE_401/final)
> Target: i386-pc-windows-msvc
> Thread model: posix
> InstalledDir: S:\WCFB01\vctools\NonShip\ClangLLVM\bin
>  "S:\\WCFB01\\vctools\\NonShip\\ClangLLVM\\bin\\clang-cl.exe" -cc1
> -triple i386-pc-windows-msvc19.11.25614 -emit-obj -mrelax-all
> -mincremental-linker-compatible -disable-free -main-file-name meow.cpp
> -mrelocation-model static -mthread-model posix -mdisable-fp-elim
> -relaxed-aliasing -fmath-errno -masm-verbose -mconstructor-aliases
> -target-cpu pentium4 -D_MT -flto-visibility-public-std
> --dependent-lib=libcmt --dependent-lib=oldnames -stack-protector 2
> -fcxx-exceptions -fexceptions -fexternc-nounwind -fms-volatile
> -fdiagnostics-format msvc -v -dwarf-column-info -debugger-tuning=gdb
> -resource-dir "S:\\WCFB01\\vctools\\NonShip\\ClangLLVM\\bin\\..\\lib\\clang\\4.0.1"
> -internal-isystem "S:\\WCFB01\\vctools\\NonShip\\ClangLLVM\\bin\\..\\lib\\clang\\4.0.1\\include"
> -internal-isystem "S:\\binaries\\x86ret\\atlmfc\\include"
> -internal-isystem "S:\\binaries\\x86ret\\inc" -internal-isystem
> "S:\\WCFB01\\ExternalApis\\Windows\\10\\sdk\\inc" -internal-isystem
> "S:\\WCFB01\\ExternalApis\\UnifiedCRT\\inc" -internal-isystem
> "S:\\WCFB01\\ExternalAPIs\\DirectX\\Jun2010\\Include" -WCL4
> -fdeprecated-macro -fdebug-compilation-dir "C:\\Temp" -ferror-limit 19
> -fmessage-length 120 -fms-extensions -fms-compatibility
> -fms-compatibility-version=19.11.25614 -std=c++14
> -fdelayed-template-parsing -fobjc-runtime=gcc -fdiagnostics-show-option
> -fcolor-diagnostics -o "C:\\Users\\stl\\AppData\\
> Local\\Temp\\1\\meow-291efe.obj" -x c++ meow.cpp
> clang -cc1 version 4.0.1 based upon LLVM 4.0.1 default target
> x86_64-pc-windows-msvc
> #include "..." search starts here:
> #include <...> search starts here:
>  S:\WCFB01\vctools\NonShip\ClangLLVM\bin\..\lib\clang\4.0.1\include
>  S:\binaries\x86ret\atlmfc\include
>  S:\binaries\x86ret\inc
>  S:\WCFB01\ExternalApis\Windows\10\sdk\inc
>  S:\WCFB01\ExternalApis\UnifiedCRT\inc
>  S:\WCFB01\ExternalAPIs\DirectX\Jun2010\Include
> End of search list.
>  "S:\\binaries\\x86ret\\bin\\i386\\link.exe" -out:meow.exe -nologo
> "C:\\Users\\stl\\AppData\\Local\\Temp\\1\\meow-291efe.obj"
> I am Clang: 4.0.1 (tags/RELEASE_401/final)
>
> Observe that my C1XX version, 19.11.25614, is detected by Clang which
> passes -fms-compatibility-version=19.11.25614 and defaults to -std=c++14.
> The linker from my development build is also used,
> S:\binaries\x86ret\bin\i386\link.exe.
>
> Next, I deleted everything in S:\WCFB01\vctools\NonShip\ClangLLVM\,
> downloaded http://prereleases.llvm.org/5.0.0/rc2/LLVM-5.0.0-rc2-win64.exe
> (grinding my teeth at non-secure HTTP), and extracted 5.0.0-rc2 there:
>
> S:\WCFB01\vctools\NonShip\ClangLLVM>dir /b
>
> S:\WCFB01\vctools\NonShip\ClangLLVM>7z x C:\Temp\LLVM-5.0.0-rc2-win64.exe
> -x!Uninstall.exe -x!$PLUGINSDIR\*
>
> 7-Zip [64] 16.04 : Copyright (c) 1999-2016 Igor Pavlov : 2016-10-04
>
> Scanning the drive for archives:
> 1 file, 131097761 bytes (126 MiB)
>
> Extracting archive: C:\Temp\LLVM-5.0.0-rc2-win64.exe
> --
> Path = C:\Temp\LLVM-5.0.0-rc2-win64.exe
> Type = Nsis
> Physical Size = 131097761
> Method = LZMA:25
> Solid = +
> Headers Size = 205263
> Embedded Stub Size = 114176
> SubType = NSIS-3
>
> Everything is Ok
>
> Files: 291
> Size:       1096683135
> Compressed: 131097761
>
> S:\WCFB01\vctools\NonShip\ClangLLVM>dir /b
> bin
> include
> lib
> libexec
> msbuild-bin
> share
> tools
>
> Now in my usual command prompt (where PATH, INCLUDE, and LIB are
> unchanged):
>
> C:\Temp>where clang-cl
> S:\WCFB01\vctools\NonShip\ClangLLVM\bin\clang-cl.exe
>
> C:\Temp>clang-cl -v -m32 /EHsc /nologo /W4 /MT meow.cpp && meow
> clang version 5.0.0 (tags/RELEASE_500/rc2)
> Target: i386-pc-windows-msvc
> Thread model: posix
> InstalledDir: S:\WCFB01\vctools\NonShip\ClangLLVM\bin
>  "S:\\WCFB01\\vctools\\NonShip\\ClangLLVM\\bin\\clang-cl.exe" -cc1
> -triple i386-pc-windows-msvc18.0.40629 -emit-obj -mrelax-all
> -mincremental-linker-compatible -disable-free -main-file-name meow.cpp
> -mrelocation-model static -mthread-model posix -mdisable-fp-elim
> -relaxed-aliasing -fmath-errno -masm-verbose -mconstructor-aliases
> -target-cpu pentium4 -D_MT -flto-visibility-public-std
> --dependent-lib=libcmt --dependent-lib=oldnames -stack-protector 2
> -fcxx-exceptions -fexceptions -fexternc-nounwind -fms-volatile
> -fdiagnostics-format msvc -v -dwarf-column-info -debugger-tuning=gdb
> -resource-dir "S:\\WCFB01\\vctools\\NonShip\\ClangLLVM\\lib\\clang\\5.0.0"
> -internal-isystem "S:\\WCFB01\\vctools\\NonShip\
> \ClangLLVM\\lib\\clang\\5.0.0\\include" -internal-isystem
> "S:\\binaries\\x86ret\\atlmfc\\include" -internal-isystem
> "S:\\binaries\\x86ret\\inc" -internal-isystem "S:\\WCFB01\\ExternalApis\\Windows\\10\\sdk\\inc"
> -internal-isystem "S:\\WCFB01\\ExternalApis\\UnifiedCRT\\inc"
> -internal-isystem "S:\\WCFB01\\ExternalAPIs\\DirectX\\Jun2010\\Include"
> -WCL4 -fdeprecated-macro -fdebug-compilation-dir "C:\\Temp" -ferror-limit
> 19 -fmessage-length 120 -fms-extensions -fms-compatibility
> -fms-compatibility-version=18.0.40629 -std=c++11 -fno-threadsafe-statics
> -fdelayed-template-parsing -fobjc-runtime=gcc -fdiagnostics-show-option
> -fcolor-diagnostics -o "C:\\Users\\stl\\AppData\\
> Local\\Temp\\1\\meow-e93677.obj" -x c++ meow.cpp
> clang -cc1 version 5.0.0 based upon LLVM 5.0.0-rc2 default target
> x86_64-pc-windows-msvc
> #include "..." search starts here:
> #include <...> search starts here:
>  S:\WCFB01\vctools\NonShip\ClangLLVM\lib\clang\5.0.0\include
>  S:\binaries\x86ret\atlmfc\include
>  S:\binaries\x86ret\inc
>  S:\WCFB01\ExternalApis\Windows\10\sdk\inc
>  S:\WCFB01\ExternalApis\UnifiedCRT\inc
>  S:\WCFB01\ExternalAPIs\DirectX\Jun2010\Include
> End of search list.
> In file included from meow.cpp:1:
> In file included from S:\binaries\x86ret\inc\iostream:6:
> In file included from S:\binaries\x86ret\inc\istream:6:
> In file included from S:\binaries\x86ret\inc\ostream:6:
> In file included from S:\binaries\x86ret\inc\ios:6:
> In file included from S:\binaries\x86ret\inc\xlocnum:7:
> In file included from S:\binaries\x86ret\inc\cmath:617:
> In file included from S:\binaries\x86ret\inc\xtgmath.h:9:
> S:\binaries\x86ret\inc\xtr1common(199,22) :  error: use of undeclared
> identifier 'char16_t'
>         struct _Is_integral<char16_t>
>                             ^
> S:\binaries\x86ret\inc\xtr1common(205,22) :  error: use of undeclared
> identifier 'char32_t'
>         struct _Is_integral<char32_t>
>                             ^
> In file included from meow.cpp:1:
> In file included from S:\binaries\x86ret\inc\iostream:6:
> In file included from S:\binaries\x86ret\inc\istream:6:
> In file included from S:\binaries\x86ret\inc\ostream:6:
> In file included from S:\binaries\x86ret\inc\ios:6:
> In file included from S:\binaries\x86ret\inc\xlocnum:10:
> In file included from S:\binaries\x86ret\inc\streambuf:6:
> In file included from S:\binaries\x86ret\inc\xiosbase:6:
> In file included from S:\binaries\x86ret\inc\xlocale:8:
> In file included from S:\binaries\x86ret\inc\stdexcept:6:
> In file included from S:\binaries\x86ret\inc\exception:7:
> In file included from S:\binaries\x86ret\inc\type_traits:6:
> S:\binaries\x86ret\inc\xstddef(257,2) :  error: 'auto' return without
> trailing return type; deduced return types are a
>       C++14 extension
>         auto _Unfancy(_Ptrty _Ptr)
>         ^
> [...more errors...]
>
> Now I'm getting -fms-compatibility-version=18.0.40629 -std=c++11 which is
> thoroughly incompatible with my development build's headers (in
> S:\binaries\x86ret\inc).
>
> Let's add -fms-compatibility-version=19.11.25614 and see what happens:
>
> C:\Temp>clang-cl -v -m32 /EHsc /nologo /W4 /MT
> -fms-compatibility-version=19.11.25614 meow.cpp && meow
> clang version 5.0.0 (tags/RELEASE_500/rc2)
> Target: i386-pc-windows-msvc
> Thread model: posix
> InstalledDir: S:\WCFB01\vctools\NonShip\ClangLLVM\bin
>  "S:\\WCFB01\\vctools\\NonShip\\ClangLLVM\\bin\\clang-cl.exe" -cc1
> -triple i386-pc-windows-msvc19.11.25614 -emit-obj -mrelax-all
> -mincremental-linker-compatible -disable-free -main-file-name meow.cpp
> -mrelocation-model static -mthread-model posix -mdisable-fp-elim
> -relaxed-aliasing -fmath-errno -masm-verbose -mconstructor-aliases
> -target-cpu pentium4 -D_MT -flto-visibility-public-std
> --dependent-lib=libcmt --dependent-lib=oldnames -stack-protector 2
> -fcxx-exceptions -fexceptions -fexternc-nounwind -fms-volatile
> -fdiagnostics-format msvc -v -dwarf-column-info -debugger-tuning=gdb
> -resource-dir "S:\\WCFB01\\vctools\\NonShip\\ClangLLVM\\lib\\clang\\5.0.0"
> -internal-isystem "S:\\WCFB01\\vctools\\NonShip\
> \ClangLLVM\\lib\\clang\\5.0.0\\include" -internal-isystem
> "S:\\binaries\\x86ret\\atlmfc\\include" -internal-isystem
> "S:\\binaries\\x86ret\\inc" -internal-isystem "S:\\WCFB01\\ExternalApis\\Windows\\10\\sdk\\inc"
> -internal-isystem "S:\\WCFB01\\ExternalApis\\UnifiedCRT\\inc"
> -internal-isystem "S:\\WCFB01\\ExternalAPIs\\DirectX\\Jun2010\\Include"
> -WCL4 -fdeprecated-macro -fdebug-compilation-dir "C:\\Temp" -ferror-limit
> 19 -fmessage-length 120 -fms-extensions -fms-compatibility
> -fms-compatibility-version=19.11.25614 -std=c++14
> -fdelayed-template-parsing -fobjc-runtime=gcc -fdiagnostics-show-option
> -fcolor-diagnostics -o "C:\\Users\\stl\\AppData\\
> Local\\Temp\\1\\meow-06d238.obj" -x c++ meow.cpp
> clang -cc1 version 5.0.0 based upon LLVM 5.0.0-rc2 default target
> x86_64-pc-windows-msvc
> #include "..." search starts here:
> #include <...> search starts here:
>  S:\WCFB01\vctools\NonShip\ClangLLVM\lib\clang\5.0.0\include
>  S:\binaries\x86ret\atlmfc\include
>  S:\binaries\x86ret\inc
>  S:\WCFB01\ExternalApis\Windows\10\sdk\inc
>  S:\WCFB01\ExternalApis\UnifiedCRT\inc
>  S:\WCFB01\ExternalAPIs\DirectX\Jun2010\Include
> End of search list.
>  "C:\\Program Files (x86)\\Microsoft Visual Studio
> 12.0\\VC\\bin\\link.exe" -out:meow.exe -nologo "C:\\Users\\stl\\AppData\\
> Local\\Temp\\1\\meow-06d238.obj"
> libcmt.lib(new_scalar.obj) : warning LNK4229: invalid directive
> '/ThrowingNew' encountered; ignored
> libvcruntime.lib(trnsctrl.obj) : warning LNK4229: invalid directive
> '/GUARDSYM:___CxxFrameHandler,S' encountered; ignored
> libvcruntime.lib(trnsctrl.obj) : warning LNK4229: invalid directive
> '/GUARDSYM:___CxxFrameHandler3,S' encountered; ignored
> libvcruntime.lib(trnsctrl.obj) : warning LNK4229: invalid directive
> '/GUARDSYM:___CxxFrameHandler2,S' encountered; ignored
> libvcruntime.lib(trnsctrl.obj) : warning LNK4229: invalid directive
> '/GUARDSYM:___CxxLongjmpUnwind at 4,S' encountered; ignored
> libvcruntime.lib(chandler4.obj) : warning LNK4229: invalid directive
> '/GUARDSYM:__except_handler4,S' encountered; ignored
> libcmt.lib(loadcfg.obj) : error LNK2001: unresolved external symbol
> ___guard_iat_table
> libcmt.lib(loadcfg.obj) : error LNK2001: unresolved external symbol
> ___guard_iat_count
> libcmt.lib(loadcfg.obj) : error LNK2001: unresolved external symbol
> ___guard_longjmp_table
> libcmt.lib(loadcfg.obj) : error LNK2001: unresolved external symbol
> ___guard_longjmp_count
> meow.exe : fatal error LNK1120: 4 unresolved externals
> clang-cl.exe: error: linker command failed with exit code 1120 (use -v to
> see invocation)
>
> That additionally activates -std=c++14, and compilation succeeds. However,
> VS 2013's linker is used - that's the "C:\\Program Files (x86)\\Microsoft
> Visual Studio 12.0\\VC\\bin\\link.exe" - and it's unable to understand
> various parts of VS 2017-era libraries.
>
> Trying to add -fuse-ld=S:\binaries\x86ret\bin\i386\link.exe doesn't work:
>
> C:\Temp>clang-cl -v -m32 /EHsc /nologo /W4 /MT
> -fms-compatibility-version=19.11.25614 -fuse-ld=S:\binaries\x86ret\bin\i386\link.exe
> meow.cpp && meow
> clang version 5.0.0 (tags/RELEASE_500/rc2)
> Target: i386-pc-windows-msvc
> Thread model: posix
> InstalledDir: S:\WCFB01\vctools\NonShip\ClangLLVM\bin
>  "S:\\WCFB01\\vctools\\NonShip\\ClangLLVM\\bin\\clang-cl.exe" -cc1
> -triple i386-pc-windows-msvc19.11.25614 -emit-obj -mrelax-all
> -mincremental-linker-compatible -disable-free -main-file-name meow.cpp
> -mrelocation-model static -mthread-model posix -mdisable-fp-elim
> -relaxed-aliasing -fmath-errno -masm-verbose -mconstructor-aliases
> -target-cpu pentium4 -D_MT -flto-visibility-public-std
> --dependent-lib=libcmt --dependent-lib=oldnames -stack-protector 2
> -fcxx-exceptions -fexceptions -fexternc-nounwind -fms-volatile
> -fdiagnostics-format msvc -v -dwarf-column-info -debugger-tuning=gdb
> -resource-dir "S:\\WCFB01\\vctools\\NonShip\\ClangLLVM\\lib\\clang\\5.0.0"
> -internal-isystem "S:\\WCFB01\\vctools\\NonShip\
> \ClangLLVM\\lib\\clang\\5.0.0\\include" -internal-isystem
> "S:\\binaries\\x86ret\\atlmfc\\include" -internal-isystem
> "S:\\binaries\\x86ret\\inc" -internal-isystem "S:\\WCFB01\\ExternalApis\\Windows\\10\\sdk\\inc"
> -internal-isystem "S:\\WCFB01\\ExternalApis\\UnifiedCRT\\inc"
> -internal-isystem "S:\\WCFB01\\ExternalAPIs\\DirectX\\Jun2010\\Include"
> -WCL4 -fdeprecated-macro -fdebug-compilation-dir "C:\\Temp" -ferror-limit
> 19 -fmessage-length 120 -fms-extensions -fms-compatibility
> -fms-compatibility-version=19.11.25614 -std=c++14
> -fdelayed-template-parsing -fobjc-runtime=gcc -fdiagnostics-show-option
> -fcolor-diagnostics -o "C:\\Users\\stl\\AppData\\
> Local\\Temp\\1\\meow-74e9f6.obj" -x c++ meow.cpp
> clang -cc1 version 5.0.0 based upon LLVM 5.0.0-rc2 default target
> x86_64-pc-windows-msvc
> #include "..." search starts here:
> #include <...> search starts here:
>  S:\WCFB01\vctools\NonShip\ClangLLVM\lib\clang\5.0.0\include
>  S:\binaries\x86ret\atlmfc\include
>  S:\binaries\x86ret\inc
>  S:\WCFB01\ExternalApis\Windows\10\sdk\inc
>  S:\WCFB01\ExternalApis\UnifiedCRT\inc
>  S:\WCFB01\ExternalAPIs\DirectX\Jun2010\Include
> End of search list.
>  "x86_64-pc-windows-msvc-S:\\binaries\\x86ret\\bin\\i386\\link.exe"
> -out:meow.exe -nologo "C:\\Users\\stl\\AppData\\
> Local\\Temp\\1\\meow-74e9f6.obj"
> clang-cl.exe: error: unable to execute command: program not executable
> clang-cl.exe: error: linker command failed with exit code 1 (use -v to see
> invocation)
>
> Some searching led me to https://github.com/llvm-mirror/clang/commit/
> 635bc7fefc12cc1333ba6ec77e563b7c8af01265 "Accept absolute paths in the
> -fuse-ld option." so I'm not sure why this doesn't work.
>
> I'm not picky about the linker (and I don't need debug info), so let's try
> -fuse-ld=lld-link and see what happens:
>
> C:\Temp>clang-cl -v -m32 /EHsc /nologo /W4 /MT
> -fms-compatibility-version=19.11.25614 -fuse-ld=lld-link meow.cpp && meow
> clang version 5.0.0 (tags/RELEASE_500/rc2)
> Target: i386-pc-windows-msvc
> Thread model: posix
> InstalledDir: S:\WCFB01\vctools\NonShip\ClangLLVM\bin
>  "S:\\WCFB01\\vctools\\NonShip\\ClangLLVM\\bin\\clang-cl.exe" -cc1
> -triple i386-pc-windows-msvc19.11.25614 -emit-obj -mrelax-all
> -mincremental-linker-compatible -disable-free -main-file-name meow.cpp
> -mrelocation-model static -mthread-model posix -mdisable-fp-elim
> -relaxed-aliasing -fmath-errno -masm-verbose -mconstructor-aliases
> -target-cpu pentium4 -D_MT -flto-visibility-public-std
> --dependent-lib=libcmt --dependent-lib=oldnames -stack-protector 2
> -fcxx-exceptions -fexceptions -fexternc-nounwind -fms-volatile
> -fdiagnostics-format msvc -v -dwarf-column-info -debugger-tuning=gdb
> -resource-dir "S:\\WCFB01\\vctools\\NonShip\\ClangLLVM\\lib\\clang\\5.0.0"
> -internal-isystem "S:\\WCFB01\\vctools\\NonShip\
> \ClangLLVM\\lib\\clang\\5.0.0\\include" -internal-isystem
> "S:\\binaries\\x86ret\\atlmfc\\include" -internal-isystem
> "S:\\binaries\\x86ret\\inc" -internal-isystem "S:\\WCFB01\\ExternalApis\\Windows\\10\\sdk\\inc"
> -internal-isystem "S:\\WCFB01\\ExternalApis\\UnifiedCRT\\inc"
> -internal-isystem "S:\\WCFB01\\ExternalAPIs\\DirectX\\Jun2010\\Include"
> -WCL4 -fdeprecated-macro -fdebug-compilation-dir "C:\\Temp" -ferror-limit
> 19 -fmessage-length 120 -fms-extensions -fms-compatibility
> -fms-compatibility-version=19.11.25614 -std=c++14
> -fdelayed-template-parsing -fobjc-runtime=gcc -fdiagnostics-show-option
> -fcolor-diagnostics -o "C:\\Users\\stl\\AppData\\
> Local\\Temp\\1\\meow-1d7183.obj" -x c++ meow.cpp
> clang -cc1 version 5.0.0 based upon LLVM 5.0.0-rc2 default target
> x86_64-pc-windows-msvc
> #include "..." search starts here:
> #include <...> search starts here:
>  S:\WCFB01\vctools\NonShip\ClangLLVM\lib\clang\5.0.0\include
>  S:\binaries\x86ret\atlmfc\include
>  S:\binaries\x86ret\inc
>  S:\WCFB01\ExternalApis\Windows\10\sdk\inc
>  S:\WCFB01\ExternalApis\UnifiedCRT\inc
>  S:\WCFB01\ExternalAPIs\DirectX\Jun2010\Include
> End of search list.
>  "S:\\WCFB01\\vctools\\NonShip\\ClangLLVM\\bin\\lld-link" -out:meow.exe
> -nologo "C:\\Users\\stl\\AppData\\Local\\Temp\\1\\meow-1d7183.obj"
> I am Clang: 5.0.0 (tags/RELEASE_500/rc2)
>
> That works, although I'm a little nervous about using this for our whole
> test suite when it isn't the default.
>
> So my questions are:
>
> 1. Why is Clang 5.0 behaving differently from Clang 4.0 here? I see
> https://github.com/llvm-mirror/clang/blob/master/lib/
> Driver/ToolChains/MSVC.cpp trying to detect VS 2017 and other versions.
>
> 2. Is there a simple way for me to get Clang 4.0's behavior back, where
> having cl.exe and link.exe on my PATH makes Clang automatically detect the
> correct -fms-compatibility-version and link.exe to be used?
>
> Thanks,
> STL
>
> _______________________________________________
> cfe-dev mailing list
> cfe-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-dev
>
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