[cfe-dev] Using Clang 5.0.0 RC2 with MSVC dev builds
Nico Weber via cfe-dev
cfe-dev at lists.llvm.org
Tue Aug 15 08:25:58 PDT 2017
You could use the prebuilt binaries at https://is.gd/chromeclang to narrow
down the regression range. The change don linked to sounds likely though,
so hopefully Zach can say if this was an intentional change :-)
On Mon, Aug 14, 2017 at 11:17 PM, don hinton via cfe-dev <
cfe-dev at lists.llvm.org> wrote:
> I think this change might be causing the problem you are seeing:
> https://reviews.llvm.org/D30758
>
>
>
>
>
>
> On Mon, Aug 14, 2017 at 6:17 PM, Reid Kleckner via cfe-dev <
> cfe-dev at lists.llvm.org> wrote:
>
>> > 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\i38
>>> 6;S:\WCFB01\vctools\Compiler\Regress\bin\AMD64\xperf;S:\WCFB
>>> 01\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\C
>>> ompiler\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\ExternalApi
>>> s\UnifiedCRT\inc;S:\WCFB01\ExternalAPIs\DirectX\Jun2010\Include;
>>>
>>> C:\Temp>echo %LIB%
>>> S:\binaries\x86ret\atlmfc\lib\i386;S:\binaries\x86ret\lib\i3
>>> 86;S:\WCFB01\ExternalApis\Windows\10\sdk\lib\x86;S:\WCFB01\E
>>> xternalApis\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.e
>>> xe (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\\Loca
>>> l\\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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