[FFmpeg-trac] #3650(build system:new): configure fails for VS2013 if environment variable 'CL' was set

FFmpeg trac at avcodec.org
Sat May 17 12:29:50 CEST 2014

#3650: configure fails for VS2013 if environment variable 'CL' was set
             Reporter:  onsager      |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:  build        |                  Version:
  system                             |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
 Summary of the bug:

 Certain values for the environment variable 'CL' on Windows break MSVC-
 based builds.

 How to reproduce:

 Set CL to '/MP' (or similar arguments containing forward slashes)

 On several occasions (configure and actual build) msys path conversion
 kicks in and mangles the environment variable into something like
 'c:\mingw\msys\1.0\MP', leading to missing bogus files for compiler and


 set 'CL' to '-MP' or similar. The error is not ffmpegs fault but hard to
 identify, and should at least be mentioned at documentation level:


Ticket URL: <https://trac.ffmpeg.org/ticket/3650>
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