Add preprocessor from console

Jacko123 · 08-31-2007, 07:33 AM

Hello,
I have defined some preprocessor into my project. Something like

Code:

#ifdef _ENCRYPTION_
//perform encryption activity
#endif
//do normal operation

How to add this preprocessor into my project from the terminal, so that I can perform encryption activity?

Thanks

theYinYeti · 08-31-2007, 07:45 AM

I don't quite get what you mean. If you really have the //comments, then you have this:

Code:

... misc code...
//perform encryption activity
... misc code...
//do normal operation
... misc code...

Then this should do what you want:

Code:

find /path/to/project -type f
 -exec grep -Fxq '//perform encryption activity' '{}' \;
 -exec grep -Fxq '//do normal operation' '{}' \;
 -exec sed -i -e '/^\/\/perform encryption activity$/ i#ifdef _ENCRYPTION_' -e '/^\/\/do normal operation$/ i#endif' '{}' \;

This is a single command (one line), broken into several lines here for better readability.

This shell command finds files that contain both comments, and inserts the preprocessor commands above the comments.
I did not test, so try with a test folder first.

Yves.

Jacko123 · 08-31-2007, 07:55 AM

Sorry,
what I meant was how to add the preprocessor (_ECNRYPTION_) to the makefile from the terminal.

for eg.
:>qmake ce.pro //creates a makefile
:>make //compiles

In the above example how to add the preprocessor (_ECNRYPTION_) to the makefile generated, from the terminal.

Thanks

Wim Sturkenboom · 08-31-2007, 09:04 AM

I think what you looking for is the -D option for gcc
From man gcc:

Quote:

-D name
Predefine name as a macro, with definition 1.

-D name=definition
The contents of definition are tokenized and processed as if they
appeared during translation phase three in a #define directive. In
particular, the definition will be truncated by embedded newline
characters.

I've never used it, so you must figure it out yourself or wait till someone else comes along. And as far as I know it's called a preprocessor directive.

PS There is a dedicated programming section. Usefull for future programming related questions.