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Anyone knows a solution that works something like this:

#include <stdio.h>
#include <gcc.h> /* This .h is what I'm looking for. */

int main (void) {
    /* variables declaration (...) */

    /* The following line is supposed to be equivalent to:
     *     $ gcc main.c -o main */
    results = gcc_compile_and_link("main.c", "main");

    /* Now I want to use the warnings and errors to do something.
     * For instance, I'll print them to the console: */
    for (i=0; i<results.warns_len; i++)
        printf("%s\n", results.warings[i].msg);
    for (i=0; i<results.errs_len; i++)
        printf("%s\n", results.errors[i].msg);

    /* free memory and finalize (...) */
    return 0;

I know I can run the command "gcc main.c -o main" in a fork and parse the output... but I was looking for something more 'reliable' like the example above.

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up vote 7 down vote accepted

GCC was explicitly designed to resist being used as a tools base/library. You need to use Clang for this, or call GCC through commandline.

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Do you know the reason for that design decision? – Max Mar 10 '13 at 13:11
@Max: Because it would permit those horrific proprietary code people to do the same. – DeadMG Mar 10 '13 at 16:29

It's not possible with gcc but you might find tcc (an embeddable C compiler) good enough for what you have in mind. The distribution comes with a libtcc library that allows to compile, link and run C code "on the fly".

Note that this only for C, your question is also tagged C++ but I've not seen any equivalent of tcc for C++.

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I doubt there's anything better than forking gcc. You might consider clang, which is more designed for this kind of use.

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