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Preprocessor definitions on the command line
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Hi, I need to have my compiler take preprocessor definitions from the
command line. How does it differ from normal command line parameter passing (main(int arc, char *argv[])) ?
Thanks.
command line. How does it differ from normal command line parameter passing (main(int arc, char *argv[])) ?
Thanks.
It depends on the compiler; you'll usually see things like -D<symbol> or \D<symbol>. Look it up in your documentation.
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Originally Posted by ejptccs123 
Hi, I need to have my compiler take preprocessor definitions from the
command line. How does it differ from normal command line parameter passing (main(int arc, char *argv[])) ?
Thanks.
•
•
Join Date: Dec 2006
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1. g++ -DHAVE_CONFIG -Wall -std=c++98 -o myprogram
2. ,/myprogram hello world
in 1., the command line args are used by the c preprocessor, some are forwarded to the compiler and linker
in 2., the command line args are passed to myprogram and are available as parameters passed to main
2. ,/myprogram hello world
in 1., the command line args are used by the c preprocessor, some are forwarded to the compiler and linker
in 2., the command line args are passed to myprogram and are available as parameters passed to main
Last edited by vijayan121; Jul 18th, 2007 at 9:53 am.
preprocessor directives/macros are processed at the time of compilation. Arguments relevant to preprocessor (e.g. -DXXX=value) are passed to compiler and used by compiler. Any argument passed on command line is called command line arguments. 
. So these are the CLI args to compiler.
After compilation (and linking) the executable of your program is ready.. when you call/execute this executable with CLI args, these would go to main() and will be be available to your program.
. So these are the CLI args to compiler.After compilation (and linking) the executable of your program is ready.. when you call/execute this executable with CLI args, these would go to main() and will be be available to your program.
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