CODEWITHSUNDEEP
cgccclangaddress-sanitizer
fencekicker
fencekicker

Reputation: 852

How to detect if building with address sanitizer when building with gcc 4.8?

I'm working on a program written in C that I occasionally build with address sanitizer, basically to catch bugs. The program prints a banner in the logs when it starts up with info such as: who built it, the branch it was built on, compiler etc. I was thinking it would be nice to also spell out if the binary was built using address sanitizer. I know there's __has_feature(address_sanitizer), but that only works for clang. I tried the following simple program: 

#include <stdio.h>

int main()
{
#if defined(__has_feature)
# if __has_feature(address_sanitizer)
    printf ("We has ASAN!\n");
# else
    printf ("We have has_feature, no ASAN!\n");
# endif
#else
    printf ("We got nothing!\n");
#endif

    return 0;
}

When building with gcc -Wall -g -fsanitize=address -o asan asan.c, this yields: 

We got nothing!

With clang -Wall -g -fsanitize=address -o asan asan.c I get: 

We has ASAN!

Is there a gcc equivalent to __has_feature?

I know there are ways to check, like the huge VSZ value for programs built with address sanitizer, just wondering if there's a compile-time define or something.

Upvotes: 33

Views: 9890

Answers (3)

rustyx
rustyx

Reputation: 85256

Note that GCC doesn't have __has_feature and clang doesn't set __SANITIZE_ADDRESS__.

So this should work for both clang and GCC:

#if defined(__has_feature)
#   if __has_feature(address_sanitizer) // for clang
#       define __SANITIZE_ADDRESS__ // GCC already sets this
#   endif
#endif

#if defined(__SANITIZE_ADDRESS__)
    // ASAN is enabled . . .
#endif

Upvotes: 2

Anna
Anna

Reputation: 49

You also can go with:

#if __has_feature(address_sanitizer) || defined(__SANITIZE_ADDRESS__)

You may need to #include <sanitizer/asan_interface.h>.

Upvotes: 2

cremno
cremno

Reputation: 4927

From the GCC 4.8.0 manual:

__SANITIZE_ADDRESS__

This macro is defined, with value 1, when -fsanitize=address is in use.

Upvotes: 31

Related Questions