when compress a folder on linux, a strange error occured.

[flutelifh1980]

an error appeared as below. the 7z.so i used the /usr/lib/p7zip/7z.so. and when the code run on windows, it works.

version:
7zip: 23.01
bit7z: release/v4.0.0
Linux version 5.10.0-5-generic (buildd@localhost) (gcc (Ubuntu 9.3.0-10kylin2) 9.3.0, GNU ld (GNU Binutils for Ubuntu) 2.34) #15~v10pro-KYLINOS SMP Tue Aug 3 03:55:56 UTC 2021

the code is c++ on linux:
code is as below, when run to Line 57, it crashed. The linux system sent a signal. I don't know the reason, because the code can work on windows.

[rikyoz]

Hi!
By default bit7z builds for 7-Zip 23.01. Unfortunately, this version of 7-Zip introduced some incompatibilities with p7zip's shared libraries that can cause problems like yours.
If you want to use p7zip's 7z.so with bit7z, you need to build the latter with the BIT7Z_USE_LEGACY_IUNKNOWN option enabled.
This should solve your problem.

[flutelifh1980]

ok. i build it latter and test again. thanks!

[flutelifh1980]

hi,
i add code like this in CMakeList.txt of bit7z to build the libray on linux : add_definitions("-DBIT7Z_USE_LEGACY_IUNKNOWN")
finally, i found the error message appeared like before when my code runs.
what's wrong with it ?
waiting your reply.
thanks!

[rikyoz]

add_definitions can be used to define new C++ preprocessor definitions, not to enable CMake options like BIT7Z_USE_LEGACY_IUNKNOWN.

In this case, the way you enable it depends on how you're building bit7z.

If you're including bit7z in your project via add_subdirectory, you need to set it like this

set(BIT7Z_USE_LEGACY_IUNKNOWN ON CACHE BOOL "use legacy iunknown" FORCE)

before bit7z's add_subdirectory in your CMakeLists.txt.

If instead you're building bit7z separately from your project, you need to pass -DBIT7Z_USE_LEGACY_IUNKNOWN=ON to the CMake configuration command of bit7z.