[llvm-bugs] [Bug 27215] New: clang-cl should set -fms-compatbility-version according to the environment

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=27215

            Bug ID: 27215
           Summary: clang-cl should set -fms-compatbility-version
                    according to the environment
           Product: clang
           Version: 3.8
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: nikolai.kosjar at theqtcompany.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

The documentation [1] states that clang-cl should be run in e.g. a "Command
Prompt where the environment has been set up using e.g. vcvars32.bat."

Having a MSVC2015 (32 Bit environment) and running clang-cl in that one does
not set -fms-compatbility-version accordingly:


> CALL "C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\vcvarsall.bat" x86
> D:\work>D:\usr\llvm-3.8.0\bin\clang.exe -### D:\empty.cpp
clang version 3.8.0 (branches/release_38)
Target: i686-pc-windows-msvc
Thread model: posix
InstalledDir: D:\usr\llvm-3.8.0\bin
 "D:\\usr\\llvm-3.8.0\\bin\\clang.exe" "-cc1" "-triple"
"i686-pc-windows-msvc18.0.0" "-emit-obj" "-mrelax-all"
ncremental-linker-compatible" "-disable-free" "-main-file-name" "empty.cpp"
"-mrelocation-model" "static" "-mt
-model" "posix" "-mdisable-fp-elim" "-fmath-errno" "-masm-verbose"
"-mconstructor-aliases" "-target-cpu" "pent
 "-dwarf-column-info" "-debugger-tuning=gdb" "-resource-dir"
"D:\\usr\\llvm-3.8.0\\bin\\..\\lib\\clang\\3.8.0"
ternal-isystem" "D:\\usr\\llvm-3.8.0\\bin\\..\\lib\\clang\\3.8.0\\include"
"-internal-isystem" "C:\\Program Fi
x86)\\Microsoft Visual Studio 14.0\\VC\\INCLUDE" "-internal-isystem"
"C:\\Program Files (x86)\\Microsoft Visua
dio 14.0\\VC\\ATLMFC\\INCLUDE" "-internal-isystem" "C:\\Program Files
(x86)\\Windows Kits\\10\\include\\10.0.1
0\\ucrt" "-internal-isystem" "C:\\Program Files (x86)\\Windows
Kits\\NETFXSDK\\4.6.1\\include\\um" "-internal-
em" "C:\\Program Files (x86)\\Windows Kits\\8.1\\include\\\\shared"
"-internal-isystem" "C:\\Program Files (x8
indows Kits\\8.1\\include\\\\um" "-internal-isystem" "C:\\Program Files
(x86)\\Windows Kits\\8.1\\include\\\\w
 "-fdeprecated-macro" "-fdebug-compilation-dir" "D:\\work" "-ferror-limit" "19"
"-fmessage-length" "115" "-fms
nsions" "-fms-compatibility" "-fms-compatibility-version=18" "-std=c++11"
"-fno-threadsafe-statics" "-fdelayed
late-parsing" "-fobjc-runtime=gcc" "-fdiagnostics-show-option"
"-fcolor-diagnostics" "-o" "C:\\Users\\nik\\App
\Local\\Temp\\empty-e37cbc.o" "-x" "c++" "D:\\empty.cpp"
 "C:\\Program Files (x86)\\Microsoft Visual Studio 14.0\\VC\\bin\\link.exe"
"-out:a.exe" "-defaultlib:libcmt"
ogo" "C:\\Users\\nik\\AppData\\Local\\Temp\\empty-e37cbc.o"


Note the -fms-compatibility-version=18 argument. Expected is
"-fms-compatibility-version=19" for MSVC2015.


[1] http://clang.llvm.org/docs/UsersManual.html#clang-cl

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