How to disable Logging Dynamic Loader Events(dyld) in XCode?

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My XCode console is filled with 100s of dyld logs. Below are a few.

_dyld_register_func_for_add_image(0x7fff520d360c)
_dyld_is_memory_immutable(0x7fff5127617d, 1)
_dyld_is_memory_immutable(0x7fff5127617d, 1)
_dyld_is_memory_immutable(0x7fff5127617d, 1)
_dyld_is_memory_immutable(0x7fff5127617d, 1)
_dyld_is_memory_immutable(0x7fff5127617d, 1)
_dyld_is_memory_immutable(0x7fff5127617d, 1)
_dyld_is_memory_immutable(0x7fff5127617d, 1)
_dyld_is_memory_immutable(0x7fff5127617d, 1)
_dyld_register_for_bulk_image_loads(0x7fff522f9bb3)
_dyld_is_memory_immutable(0x7fff522ddd72, 36)
dlopen_internal(/System/Library/PrivateFrameworks/Alternate/MallocStackLogging.framework/MallocStackLogging, 0x00000008)
  dlopen_internal() failed, error: 'dlopen(/System/Library/PrivateFrameworks/Alternate/MallocStackLogging.framework/MallocStackLogging, 8): image not found'
dlopen_internal(/System/Library/PrivateFrameworks/MallocStackLogging.framework/MallocStackLogging, 0x00000008)
  dlopen_internal(/System/Library/PrivateFrameworks/MallocStackLogging.framework/MallocStackLogging) ==> 0x105571f78
dlsym_internal(0x105571f78, msl_handle_memory_event)
  dlsym_internal(0x105571f78, msl_handle_memory_event) ==> 0x7fff3bfddfa0
dlsym_internal(0x105571f78, msl_stack_logging_locked)
  dlsym_internal(0x105571f78, msl_stack_logging_locked) ==> 0x7fff3bfe3230
dlsym_internal(0x105571f78, msl_fork_prepare)
  dlsym_internal(0x105571f78, msl_fork_prepare) ==> 0x7fff3bfdfd70
dlsym_internal(0x105571f78, msl_fork_child)
  dlsym_internal(0x105571f78, msl_fork_child) ==> 0x7fff3bfdfdc0
dlsym_internal(0x105571f78, msl_fork_parent)
  dlsym_internal(0x105571f78, msl_fork_parent) ==> 0x7fff3bfdfda0
dlsym_internal(0x105571f78, msl_get_frames_for_address)
  dlsym_internal(0x105571f78, msl_get_frames_for_address) ==> 0x7fff3bfe1920
dlsym_internal(0x105571f78, msl_stackid_for_vm_region)
  dlsym_internal(0x105571f78, msl_stackid_for_vm_region) ==> 0x7fff3bfe2510
dlsym_internal(0x105571f78, msl_get_frames_for_stackid)
  dlsym_internal(0x105571f78, msl_get_frames_for_stackid) ==> 0x7fff3bfe2690
dlsym_internal(0x105571f78, msl_uniquing_table_read_stack)
  dlsym_internal(0x105571f78, msl_uniquing_table_read_stack) ==> 0x7fff3bfe2810
dlsym_internal(0x105571f78, msl_copy_msl_lite_hooks)
  dlsym_internal(0x105571f78, msl_copy_msl_lite_hooks) ==> 0x7fff3bfddab0
dlsym_internal(0x105571f78, msl_set_flags_from_environment)
  dlsym_internal(0x105571f78, msl_set_flags_from_environment) ==> 0x7fff3bfdd670
dlsym_internal(0x105571f78, msl_initialize)
  dlsym_internal(0x105571f78, msl_initialize) ==> 0x7fff3bfdd8d0

It is making it very difficult when printing something or when debugging. How to disable these logs?

This is how my scheme looks like

ios
swift
xcode11
dyld
asked on Stack Overflow Aug 5, 2020 by Pravalika • edited Aug 6, 2020 by Pravalika

1 Answer

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I'm too newbie in this forum, but.. did you take a look to the following env variables?

DYLD_PRINT_LIBRARIES: Logs when images are loaded.

DYLD_PRINT_LIBRARIES_POST_LAUNCH: Logs when images are loaded as a result of a dlopen call. Includes a dynamic libraries’ dependent libraries.

DYLD_PRINT_APIS: Logs the invocation that causes the dynamic loader to return the address of a symbol.

DYLD_PRINT_STATISTICS: Logs statistical information on an application’s launch process, such as how many images were loaded, when the application finishes launching.

DYLD_PRINT_INITIALIZERS: Logs when the dynamic loader calls initializer and finalizer functions.

DYLD_PRINT_SEGMENTS: Logs when the dynamic loader maps a segment of a dynamic library to the current process’s address space.

DYLD_PRINT_BINDINGS: Logs when the dynamic loader binds an undefined external symbol with its definition.

Best Regards,
David

answered on Stack Overflow Aug 6, 2020 by David Merino

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