c - How can I know if Leak Sanitizer is enabled at compile time? -

the gcc , clang compilers both have support leaksanitizer helps finding memory leaks in c programs. memory leak unavoidable (because being tested in test suite example).

such memory can annotated using leak sanitizer interface:

#include <sanitizer/lsan_interface.h>  void *p = create_new_object(); __lsan_ignore_object(p); 

this break on compilers not support lsan. in address sanitizer, construct can used detect availablity of asan:

/* __has_feature(address_sanitizer) used later clang,  * compatibility other compilers (such gcc , msvc) */ #ifndef __has_feature #   define __has_feature(x) 0 #endif  #if __has_feature(address_sanitizer) || defined(__sanitize_address__)     /* asan-aware code here. */ #endif 

there no __has_feature(leak_sanitizer) detect existence of lsan in clang , neither __sanitize_leaks__ exist gcc. how can detect asan availability anyway? note lsan can enabled independently of addresssanitizer , threadsanitizer.

as compiler not set preprocessor define 1 have himself.

one compile -fsanitize=leak -dmyleaksan=1 leaksanitizer or without leaksanitizer 1 compile -dmyleaksan=0. if 1 forget define myleaksan compiler halted.

#ifndef myleaksan #   error: myleaksan must either 0 or 1 #endif #include <stdio.h> #include <stdlib.h> #if myleaksan #   include <sanitizer/lsan_interface.h> #endif  int main(void) {     void *p = malloc(5); #if myleaksan     __lsan_ignore_object(p); #endif }