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how to use the c51 compiler for example if i use c51 -C main.c it is giving error like c51 FATAL-ERROR - ACTION: PARSING INVOKE-/#PRAGMA - LINE LINE: C:\KEIL\C51\BIN\c51.exe -C main.c ERROR: UNKNOWN CONTROL C51 TERMINATED.
read the manual, or read the error message maybe -C is an UNKNOWN CONTROL
"how to use the c51 compiler" You're trolling, aren't you?
The C51 command line options differ from many of the more "mainstream" (and I use that term loosely) compilers.