C51: Unable to Find Include Files Using Long Directory Names

Information in this article applies to:

• C51 Version 5.50

QUESTION

My project is stored in the following directory:

C:\DEV\EPILOGUE_51

and my header files are stored in:

C:\DEV\EPILOGUE_51\H

I have added the path to the header directory to the C51INC variable in my AUTOEXEC.BAT.

When I build my project at the DOS prompt, the compiler cannot find the header file. Why?

ANSWER

The C51 compiler is a 16-bit program and cannot support long path names. There are several solutions or work-arounds to this problem:

• Rename the directory with the long name.

• Add the following to your AUTOEXEC.BAT file:

  SET C51IC=C:\DEV\EPILOG~1\H
  

  You can find out the correct shortened name by going into the DEV directory and typing 'DIR'.

• Use the compiler's INCDIR directive to specify the 'H' header directory:

  C51 TEST.C INCDIR(H)
  

MORE INFORMATION

• Refer to INCDIR in the Cx51 User's Guide.
• Refer to Environment Settings in the Cx51 User's Guide.

Last Reviewed: Thursday, February 25, 2021