我刚用brew在MacBook上安装了valgrind，并对此进行了测试：
int main(void)
{
return (0);
}
以下是命令：
valgrind --tool = memcheck --leak-check = full ./test_leaks
输出：
==736== Memcheck, a memory error detector
==736== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==736== Using Valgrind-3.14.0 and LibVEX; rerun with -h for copyright info
==736== Command: ./test_leaks
==736==
==736==
==736== HEAP SUMMARY:
==736== in use at exit: 18,245 bytes in 162 blocks
==736== total heap usage: 183 allocs, 21 frees, 26,693 bytes allocated
==736==
==736== 64 bytes in 1 blocks are definitely lost in loss record 14 of 39
==736== at 0x1000AB6EA: calloc (in /usr/local/Cellar/valgrind/3.14.0/lib/valgrind/vgpreload_memcheck-amd64-darwin.so)
==736== by 0x100758B9A: realizeClass(objc_class*) (in /usr/lib/libobjc.A.dylib)
==736== by 0x100758C50: realizeClass(objc_class*) (in /usr/lib/libobjc.A.dylib)
==736== by 0x100758C50: realizeClass(objc_class*) (in /usr/lib/libobjc.A.dylib)
==736== by 0x10075732B: _read_images (in /usr/lib/libobjc.A.dylib)
==736== by 0x100755A9D: map_images_nolock (in /usr/lib/libobjc.A.dylib)
==736== by 0x1007684E0: map_images (in /usr/lib/libobjc.A.dylib)
==736== by 0x100006C64: dyld::notifyBatchPartial(dyld_image_states, bool, char const* (*)(dyld_image_states, unsigned int, dyld_image_info const*), bool, bool) (in /usr/lib/dyld)
==736== by 0x100006E39: dyld::registerObjCNotifiers(void (*)(unsigned int, char const* const*, mach_header const* const*), void (*)(char const*, mach_header const*), void (*)(char const*, mach_header const*)) (in /usr/lib/dyld)
==736== by 0x10022071D: _dyld_objc_notify_register (in /usr/lib/system/libdyld.dylib)
==736== by 0x100755073: _objc_init (in /usr/lib/libobjc.A.dylib)
==736== by 0x1001AAB34: _os_object_init (in /usr/lib/system/libdispatch.dylib)
==736==
==736== 64 bytes in 1 blocks are definitely lost in loss record 15 of 39
==736== at 0x1000AB6EA: calloc (in /usr/local/Cellar/valgrind/3.14.0/lib/valgrind/vgpreload_memcheck-amd64-darwin.so)
==736== by 0x100758B9A: realizeClass(objc_class*) (in /usr/lib/libobjc.A.dylib)
==736== by 0x100758C50: realizeClass(objc_class*) (in /usr/lib/libobjc.A.dylib)
==736== by 0x100758C50: realizeClass(objc_class*) (in /usr/lib/libobjc.A.dylib)
==736== by 0x100758C50: realizeClass(objc_class*) (in /usr/lib/libobjc.A.dylib)
==736== by 0x10075732B: _read_images (in /usr/lib/libobjc.A.dylib)
==736== by 0x100755A9D: map_images_nolock (in /usr/lib/libobjc.A.dylib)
==736== by 0x1007684E0: map_images (in /usr/lib/libobjc.A.dylib)
==736== by 0x100006C64: dyld::notifyBatchPartial(dyld_image_states, bool, char const* (*)(dyld_image_states, unsigned int, dyld_image_info const*), bool, bool) (in /usr/lib/dyld)
==736== by 0x100006E39: dyld::registerObjCNotifiers(void (*)(unsigned int, char const* const*, mach_header const* const*), void (*)(char const*, mach_header const*), void (*)(char const*, mach_header const*)) (in /usr/lib/dyld)
==736== by 0x10022071D: _dyld_objc_notify_register (in /usr/lib/system/libdyld.dylib)
==736== by 0x100755073: _objc_init (in /usr/lib/libobjc.A.dylib)
==736==
==736== 64 bytes in 1 blocks are definitely lost in loss record 16 of 39
==736== at 0x1000AB6EA: calloc (in /usr/local/Cellar/valgrind/3.14.0/lib/valgrind/vgpreload_memcheck-amd64-darwin.so)
==736== by 0x100758B9A: realizeClass(objc_class*) (in /usr/lib/libobjc.A.dylib)
==736== by 0x100758C68: realizeClass(objc_class*) (in /usr/lib/libobjc.A.dylib)
==736== by 0x100758C50: realizeClass(objc_class*) (in /usr/lib/libobjc.A.dylib)
==736== by 0x100758C50: realizeClass(objc_class*) (in /usr/lib/libobjc.A.dylib)
==736== by 0x100758C50: realizeClass(objc_class*) (in /usr/lib/libobjc.A.dylib)
==736== by 0x10075732B: _read_images (in /usr/lib/libobjc.A.dylib)
==736== by 0x100755A9D: map_images_nolock (in /usr/lib/libobjc.A.dylib)
==736== by 0x1007684E0: map_images (in /usr/lib/libobjc.A.dylib)
==736== by 0x100006C64: dyld::notifyBatchPartial(dyld_image_states, bool, char const* (*)(dyld_image_states, unsigned int, dyld_image_info const*), bool, bool) (in /usr/lib/dyld)
==736== by 0x100006E39: dyld::registerObjCNotifiers(void (*)(unsigned int, char const* const*, mach_header const* const*), void (*)(char const*, mach_header const*), void (*)(char const*, mach_header const*)) (in /usr/lib/dyld)
==736== by 0x10022071D: _dyld_objc_notify_register (in /usr/lib/system/libdyld.dylib)
==736==
==736== 64 bytes in 1 blocks are definitely lost in loss record 17 of 39
==736== at 0x1000AB6EA: calloc (in /usr/local/Cellar/valgrind/3.14.0/lib/valgrind/vgpreload_memcheck-amd64-darwin.so)
==736== by 0x100758B9A: realizeClass(objc_class*) (in /usr/lib/libobjc.A.dylib)
==736== by 0x100758C68: realizeClass(objc_class*) (in /usr/lib/libobjc.A.dylib)
==736== by 0x100758C50: realizeClass(objc_class*) (in /usr/lib/libobjc.A.dylib)
==736== by 0x100758C50: realizeClass(objc_class*) (in /usr/lib/libobjc.A.dylib)
==736== by 0x10075732B: _read_images (in /usr/lib/libobjc.A.dylib)
==736== by 0x100755A9D: map_images_nolock (in /usr/lib/libobjc.A.dylib)
==736== by 0x1007684E0: map_images (in /usr/lib/libobjc.A.dylib)
==736== by 0x100006C64: dyld::notifyBatchPartial(dyld_image_states, bool, char const* (*)(dyld_image_states, unsigned int, dyld_image_info const*), bool, bool) (in /usr/lib/dyld)
==736== by 0x100006E39: dyld::registerObjCNotifiers(void (*)(unsigned int, char const* const*, mach_header const* const*), void (*)(char const*, mach_header const*), void (*)(char const*, mach_header const*)) (in /usr/lib/dyld)
==736== by 0x10022071D: _dyld_objc_notify_register (in /usr/lib/system/libdyld.dylib)
==736== by 0x100755073: _objc_init (in /usr/lib/libobjc.A.dylib)
==736==
==736== 72 bytes in 3 blocks are possibly lost in loss record 18 of 39
==736== at 0x1000AB6EA: calloc (in /usr/local/Cellar/valgrind/3.14.0/lib/valgrind/vgpreload_memcheck-amd64-darwin.so)
==736== by 0x1007557C2: map_images_nolock (in /usr/lib/libobjc.A.dylib)
==736== by 0x1007684E0: map_images (in /usr/lib/libobjc.A.dylib)
==736== by 0x100006C64: dyld::notifyBatchPartial(dyld_image_states, bool, char const* (*)(dyld_image_states, unsigned int, dyld_image_info const*), bool, bool) (in /usr/lib/dyld)
==736== by 0x100006E39: dyld::registerObjCNotifiers(void (*)(unsigned int, char const* const*, mach_header const* const*), void (*)(char const*, mach_header const*), void (*)(char const*, mach_header const*)) (in /usr/lib/dyld)
==736== by 0x10022071D: _dyld_objc_notify_register (in /usr/lib/system/libdyld.dylib)
==736== by 0x100755073: _objc_init (in /usr/lib/libobjc.A.dylib)
==736== by 0x1001AAB34: _os_object_init (in /usr/lib/system/libdispatch.dylib)
==736== by 0x1001AAB1B: libdispatch_init (in /usr/lib/system/libdispatch.dylib)
==736== by 0x1000B99C2: libSystem_initializer (in /usr/lib/libSystem.B.dylib)
==736== by 0x100018AC5: ImageLoaderMachO::doModInitFunctions(ImageLoader::LinkContext const&) (in /usr/lib/dyld)
==736== by 0x100018CF5: ImageLoaderMachO::doInitialization(ImageLoader::LinkContext const&) (in /usr/lib/dyld)
==736==
==736== 80 (32 direct, 48 indirect) bytes in 1 blocks are definitely lost in loss record 19 of 39
==736== at 0x1000AB2FE: malloc_zone_malloc (in /usr/local/Cellar/valgrind/3.14.0/lib/valgrind/vgpreload_memcheck-amd64-darwin.so)
==736== by 0x100757ABF: NXCreateHashTableFromZone (in /usr/lib/libobjc.A.dylib)
==736== by 0x100757A6E: NXCreateHashTable (in /usr/lib/libobjc.A.dylib)
==736== by 0x100757948: NXCreateMapTableFromZone (in /usr/lib/libobjc.A.dylib)
==736== by 0x1007578D3: NXCreateMapTable (in /usr/lib/libobjc.A.dylib)
==736== by 0x100756394: __sel_registerName(char const*, int, int) (in /usr/lib/libobjc.A.dylib)
==736== by 0x100756096: sel_init (in /usr/lib/libobjc.A.dylib)
==736== by 0x10075598C: map_images_nolock (in /usr/lib/libobjc.A.dylib)
==736== by 0x1007684E0: map_images (in /usr/lib/libobjc.A.dylib)
==736== by 0x100006C64: dyld::notifyBatchPartial(dyld_image_states, bool, char const* (*)(dyld_image_states, unsigned int, dyld_image_info const*), bool, bool) (in /usr/lib/dyld)
==736== by 0x100006E39: dyld::registerObjCNotifiers(void (*)(unsigned int, char const* const*, mach_header const* const*), void (*)(char const*, mach_header const*), void (*)(char const*, mach_header const*)) (in /usr/lib/dyld)
==736== by 0x10022071D: _dyld_objc_notify_register (in /usr/lib/system/libdyld.dylib)
==736==
==736== 144 (32 direct, 112 indirect) bytes in 1 blocks are definitely lost in loss record 22 of 39
==736== at 0x1000AB2FE: malloc_zone_malloc (in /usr/local/Cellar/valgrind/3.14.0/lib/valgrind/vgpreload_memcheck-amd64-darwin.so)
==736== by 0x100757A9E: NXCreateHashTableFromZone (in /usr/lib/libobjc.A.dylib)
==736== by 0x100757A6E: NXCreateHashTable (in /usr/lib/libobjc.A.dylib)
==736== by 0x100757948: NXCreateMapTableFromZone (in /usr/lib/libobjc.A.dylib)
==736== by 0x1007578D3: NXCreateMapTable (in /usr/lib/libobjc.A.dylib)
==736== by 0x100756394: __sel_registerName(char const*, int, int) (in /usr/lib/libobjc.A.dylib)
==736== by 0x100756096: sel_init (in /usr/lib/libobjc.A.dylib)
==736== by 0x10075598C: map_images_nolock (in /usr/lib/libobjc.A.dylib)
==736== by 0x1007684E0: map_images (in /usr/lib/libobjc.A.dylib)
==736== by 0x100006C64: dyld::notifyBatchPartial(dyld_image_states, bool, char const* (*)(dyld_image_states, unsigned int, dyld_image_info const*), bool, bool) (in /usr/lib/dyld)
==736== by 0x100006E39: dyld::registerObjCNotifiers(void (*)(unsigned int, char const* const*, mach_header const* const*), void (*)(char const*, mach_header const*), void (*)(char const*, mach_header const*)) (in /usr/lib/dyld)
==736== by 0x10022071D: _dyld_objc_notify_register (in /usr/lib/system/libdyld.dylib)
==736==
==736== 192 bytes in 3 blocks are definitely lost in loss record 23 of 39
==736== at 0x1000AB6EA: calloc (in /usr/local/Cellar/valgrind/3.14.0/lib/valgrind/vgpreload_memcheck-amd64-darwin.so)
==736== by 0x100758B9A: realizeClass(objc_class*) (in /usr/lib/libobjc.A.dylib)
==736== by 0x100758C50: realizeClass(objc_class*) (in /usr/lib/libobjc.A.dylib)
==736== by 0x10075732B: _read_images (in /usr/lib/libobjc.A.dylib)
==736== by 0x100755A9D: map_images_nolock (in /usr/lib/libobjc.A.dylib)
==736== by 0x1007684E0: map_images (in /usr/lib/libobjc.A.dylib)
==736== by 0x100006C64: dyld::notifyBatchPartial(dyld_image_states, bool, char const* (*)(dyld_image_states, unsigned int, dyld_image_info const*), bool, bool) (in /usr/lib/dyld)
==736== by 0x100006E39: dyld::registerObjCNotifiers(void (*)(unsigned int, char const* const*, mach_header const* const*), void (*)(char const*, mach_header const*), void (*)(char const*, mach_header const*)) (in /usr/lib/dyld)
==736== by 0x10022071D: _dyld_objc_notify_register (in /usr/lib/system/libdyld.dylib)
==736== by 0x100755073: _objc_init (in /usr/lib/libobjc.A.dylib)
==736== by 0x1001AAB34: _os_object_init (in /usr/lib/system/libdispatch.dylib)
==736== by 0x1001AAB1B: libdispatch_init (in /usr/lib/system/libdispatch.dylib)
==736==
==736== 192 bytes in 3 blocks are definitely lost in loss record 24 of 39
==736== at 0x1000AB6EA: calloc (in /usr/local/Cellar/valgrind/3.14.0/lib/valgrind/vgpreload_memcheck-amd64-darwin.so)
==736== by 0x100758B9A: realizeClass(objc_class*) (in /usr/lib/libobjc.A.dylib)
==736== by 0x100758C68: realizeClass(objc_class*) (in /usr/lib/libobjc.A.dylib)
==736== by 0x100758C50: realizeClass(objc_class*) (in /usr/lib/libobjc.A.dylib)
==736== by 0x10075732B: _read_images (in /usr/lib/libobjc.A.dylib)
==736== by 0x100755A9D: map_images_nolock (in /usr/lib/libobjc.A.dylib)
==736== by 0x1007684E0: map_images (in /usr/lib/libobjc.A.dylib)
==736== by 0x100006C64: dyld::notifyBatchPartial(dyld_image_states, bool, char const* (*)(dyld_image_states, unsigned int, dyld_image_info const*), bool, bool) (in /usr/lib/dyld)
==736== by 0x100006E39: dyld::registerObjCNotifiers(void (*)(unsigned int, char const* const*, mach_header const* const*), void (*)(char const*, mach_header const*), void (*)(char const*, mach_header const*)) (in /usr/lib/dyld)
==736== by 0x10022071D: _dyld_objc_notify_register (in /usr/lib/system/libdyld.dylib)
==736== by 0x100755073: _objc_init (in /usr/lib/libobjc.A.dylib)
==736== by 0x1001AAB34: _os_object_init (in /usr/lib/system/libdispatch.dylib)
==736==
==736== 3,264 bytes in 51 blocks are definitely lost in loss record 37 of 39
==736== at 0x1000AB6EA: calloc (in /usr/local/Cellar/valgrind/3.14.0/lib/valgrind/vgpreload_memcheck-amd64-darwin.so)
==736== by 0x100758B9A: realizeClass(objc_class*) (in /usr/lib/libobjc.A.dylib)
==736== by 0x100758C68: realizeClass(objc_class*) (in /usr/lib/libobjc.A.dylib)
==736== by 0x10075732B: _read_images (in /usr/lib/libobjc.A.dylib)
==736== by 0x100755A9D: map_images_nolock (in /usr/lib/libobjc.A.dylib)
==736== by 0x1007684E0: map_images (in /usr/lib/libobjc.A.dylib)
==736== by 0x100006C64: dyld::notifyBatchPartial(dyld_image_states, bool, char const* (*)(dyld_image_states, unsigned int, dyld_image_info const*), bool, bool) (in /usr/lib/dyld)
==736== by 0x100006E39: dyld::registerObjCNotifiers(void (*)(unsigned int, char const* const*, mach_header const* const*), void (*)(char const*, mach_header const*), void (*)(char const*, mach_header const*)) (in /usr/lib/dyld)
==736== by 0x10022071D: _dyld_objc_notify_register (in /usr/lib/system/libdyld.dylib)
==736== by 0x100755073: _objc_init (in /usr/lib/libobjc.A.dylib)
==736== by 0x1001AAB34: _os_object_init (in /usr/lib/system/libdispatch.dylib)
==736== by 0x1001AAB1B: libdispatch_init (in /usr/lib/system/libdispatch.dylib)
==736==
==736== 4,136 (24 direct, 4,112 indirect) bytes in 1 blocks are definitely lost in loss record 39 of 39
==736== at 0x1000AB2FE: malloc_zone_malloc (in /usr/local/Cellar/valgrind/3.14.0/lib/valgrind/vgpreload_memcheck-amd64-darwin.so)
==736== by 0x100757901: NXCreateMapTableFromZone (in /usr/lib/libobjc.A.dylib)
==736== by 0x1007578D3: NXCreateMapTable (in /usr/lib/libobjc.A.dylib)
==736== by 0x100756394: __sel_registerName(char const*, int, int) (in /usr/lib/libobjc.A.dylib)
==736== by 0x100756096: sel_init (in /usr/lib/libobjc.A.dylib)
==736== by 0x10075598C: map_images_nolock (in /usr/lib/libobjc.A.dylib)
==736== by 0x1007684E0: map_images (in /usr/lib/libobjc.A.dylib)
==736== by 0x100006C64: dyld::notifyBatchPartial(dyld_image_states, bool, char const* (*)(dyld_image_states, unsigned int, dyld_image_info const*), bool, bool) (in /usr/lib/dyld)
==736== by 0x100006E39: dyld::registerObjCNotifiers(void (*)(unsigned int, char const* const*, mach_header const* const*), void (*)(char const*, mach_header const*), void (*)(char const*, mach_header const*)) (in /usr/lib/dyld)
==736== by 0x10022071D: _dyld_objc_notify_register (in /usr/lib/system/libdyld.dylib)
==736== by 0x100755073: _objc_init (in /usr/lib/libobjc.A.dylib)
==736== by 0x1001AAB34: _os_object_init (in /usr/lib/system/libdispatch.dylib)
==736==
==736== LEAK SUMMARY:
==736== definitely lost: 3,992 bytes in 64 blocks
==736== indirectly lost: 6,864 bytes in 7 blocks
==736== possibly lost: 72 bytes in 3 blocks
==736== still reachable: 32 bytes in 1 blocks
==736== suppressed: 7,285 bytes in 87 blocks
==736== Reachable blocks (those to which a pointer was found) are not shown.
==736== To see them, rerun with: --leak-check=full --show-leak-kinds=all
==736==
==736== For counts of detected and suppressed errors, rerun with: -v
==736== ERROR SUMMARY: 11 errors from 11 contexts (suppressed: 12 from 12)
出于可读性考虑，仅泄漏：
==736== LEAK SUMMARY:
==736== definitely lost: 3,992 bytes in 64 blocks
==736== indirectly lost: 6,864 bytes in 7 blocks
==736== possibly lost: 72 bytes in 3 blocks
==736== still reachable: 32 bytes in 1 blocks
==736== suppressed: 7,285 bytes in 87 blocks
我首先在正在处理的项目中使用valgrind，但由于上次（在另一台Mac上）泄漏为0，所以我认为这有点奇怪。我重新安装了valgrind几次，尝试使用我能想到的最基本的程序，现在就可以了。
尽管我已经在Mac OS上编程，但我还是比较陌生。这是正常行为吗？还是我必须以某种方式解决此问题？
编辑：
因此，这花费了一些时间，但是我终于设法消除了“不必要的”错误。我编写了一个脚本，该脚本将命令输入，通过valgrind传递，并将生成的每个泄漏存储在抑制文件中。这是valgrind在遇到时将不会显示的已知泄漏的列表（有关here和there的更多信息）。这很骇人，但可以解决我的问题。
这个解决方案虽然不是最优的，但显然不是最优的。现在，每次我看到泄漏时，都必须手动检查它是否来自程序，或者这是否是我尚未遇到的系统库泄漏。
如果某人的解决方案不太安全，我很乐意在这里解决。但是，如果您遇到相同的问题，这里暂时是script（请小心并首先检查valsup文件，尤其是如果您的主目录中已经有一个“ .valgrindrc”文件时）。这包括一个perl脚本（您可以在this page的末尾找到），该脚本可以解析valgrind输出以获得抑制。