我怎么知道在编译时是否启用了Leak Sanitizer? [英] How can I know if Leak Sanitizer is enabled at compile time?

问题描述

GCC和Clang编译器均支持 LeakSanitizer ，这有助于在C程序中查找内存泄漏.有时，内存泄漏是不可避免的(例如，正在测试套件中对其进行测试).

The GCC and Clang compilers both have support for LeakSanitizer which helps finding memory leaks in C programs. Sometimes a memory leak is unavoidable (because it is being tested in a test suite for example).

可以使用泄漏来注释此类内存.消毒器界面:

#include <sanitizer/lsan_interface.h>

void *p = create_new_object();
__lsan_ignore_object(p);

但是，这将在不支持LSan的编译器上中断.在Address Sanitizer中，此构造可用于检测ASAN的可用性:

This will however break on compilers that do not support LSan. In Address Sanitizer, this construct can be used to detect the availablity of ASAN:

/* __has_feature(address_sanitizer) is used later for Clang, this is for
 * compatibility with other compilers (such as GCC and MSVC) */
#ifndef __has_feature
#   define __has_feature(x) 0
#endif

#if __has_feature(address_sanitizer) || defined(__SANITIZE_ADDRESS__)
    /* ASAN-aware code here. */
#endif

没有__has_feature(leak_sanitizer)仅检测Clang中LSan的存在，并且__SANITIZE_LEAKS__对于GCC都不存在.无论如何，我如何检测ASAN的可用性?请注意，可以独立于AddressSanitizer和ThreadSanitizer启用LSan.

There is no __has_feature(leak_sanitizer) to detect just the existence of LSan in Clang and neither does __SANITIZE_LEAKS__ exist for GCC. How can I detect ASAN availability anyway? Note that LSan can be enabled independently of AddressSanitizer and ThreadSanitizer.

推荐答案

由于编译器没有为自己设置预处理器定义，因此必须自己完成.

As the compiler does not set a preprocessor define for itself one have to do that for himself.

使用LeakSanitizer在带有-fsanitize=leak -DMYLEAKSAN=1的情况下进行编译，或者在没有LeakSanitizer的情况下使用-DMYLEAKSAN=0的情况进行编译.如果确实忘记定义MYLEAKSAN，则编译器将暂停.

One compile with -fsanitize=leak -DMYLEAKSAN=1 with LeakSanitizer or without LeakSanitizer one compile with -DMYLEAKSAN=0. If one does forget to define MYLEAKSAN the compiler is halted.

#ifndef MYLEAKSAN
#   error: MYLEAKSAN must be 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
}

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