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µVISION: Space Character Inside Library's Name, LIB File Not Created

Information in this knowledgebase article applies to:

  • C51 Version 9.54
  • C51 Version 9.54a


If a space is included in Options For Target => Output Tab => Name of Executable, and Create Library is selected, then the *.LIB file will not be generated during a build. Also, the build output is smaller than normal, after the line "creating library *.LIB...", it immediately states a successful build.


First, close the project. In the installation folder of Keil tools (e.g. C:\Keil\, C:\Keil_v5\, etc.), go to the UV4 folder, and rename the file, UV4.exe. Download and unzip the attached file. Rename this file UV4.exe and move it to the UV4 folder. Then reopen µVision. The new executable will create a library.

Only versions 9.54 and 9.54a of the C51 toolchain cause this issue so the attached file should only be downloaded if a library is to be developed with these versions that requires a space in its name. Using a newer or earlier version of the toolchain will successfully create a library.


  • While many modern operating systems support spaces in filenames, if a later user wants to call or create a custom script, the script's design must include this interpretation of the space character.



  • Refer to Command Line in the µVision User's Guide.
  • If the user includes spaces and calls µVision from the command line, quotation marks should be used around the name of the file or target.


Request the files attached to this knowledgebase article.

Last Reviewed: Friday, February 24, 2017

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