CODEWITHSUNDEEP
cgcccompiler-constructionicc
Genís
Genís

Reputation: 1508

Add compiler stage

I need to debug a C code with lots of macros, of which a bunch of them are not trivial at all and they include several (lots of) lines. That makes it impossible to debug, since macros are expanded in a single line and you never know where an error comes from. On the other hand, its easy with sed to take the preprocessor output and add lines after each semicolon.

I won't discuss about being a good practice to use macros such as these, because I can't do much about that. But I'd like to know whether I could add an stage to the compiler (I use several compilers:icc,gcc,xlc) between preprocessing and compiling, so it I rund that sed command.

Upvotes: 1

Views: 131

Answers (3)

vonbrand
vonbrand

Reputation: 11831

Define your own "compiler" as a script to run g++ -E, then your sed-mangler, then g++, and specify that one as the compiler overall. Take care to use temporaries courtesy of mktemp, so starting your compiles in parallel (make -j) doesn't mess things up.

(Today's GCC doesn't have a separate preprocessing step anymore, so injecting something there can't be done easily anyway.)

Upvotes: 0

Genís
Genís

Reputation: 1508

By now, I will try with what I found in this post. I also tried the option of the wrapper for compiling single files and, by the moment, it does the trick. In the wrapper, I preprocess (with -E) the file, I then process the preprocessed file with sed and some rules, and then I compile it.

Upvotes: 0

piokuc
piokuc

Reputation: 26194

What you can do is to run the pre-processor only (-E):

 $ g++ -E in.c -o in.i

Then run your sed script and compile it's output with g++ (no -E this time). You could construct a rule for doing all this in your Makefile, I'm sure.

Upvotes: 3

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