[llvm-bugs] [Bug 25025] New: Compiling with -fms-extensions creates empty LC_LINKER_OPTION load command

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=25025

            Bug ID: 25025
           Summary: Compiling with -fms-extensions creates empty
                    LC_LINKER_OPTION load command
           Product: clang
           Version: 3.7
          Hardware: Macintosh
                OS: MacOS X
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: sebastian at theophil.net
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 14980
  --> https://llvm.org/bugs/attachment.cgi?id=14980&action=edit
Reproduction

I'm getting an annoying warning from ld since a while back. ld complains

ld: warning: unknown linker option from object file ignored: '' in blabla.o

When I dump the load commands in blabla.o using otool -l blabla.o I see this:

Load command 4
     cmd LC_LINKER_OPTION
 cmdsize 16
   count 1
   count 1 does not match number of strings 0

Indeed, there seems to be an empty linker option. 

I can reproduce this with a file from Microsoft's Casablanca REST SDK. I've
attached a subset of the source code with which the problem can be reproduced. 

Unzip the files and compile:

c++ -std=c++1y -I ./src/pch -I ./include/ -I path_to_boost/boost_1_59_0/
./src/pplx/apple/pplxapple.cpp -fms-extensions -c -o pplxapple.o

Removing -fms-extensions removes the empty linker option

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