Tobias Bergkvist added the comment:
I made a typo (forgetting the -D):
clang -Wno-unused-result -Wsign-compare -g -O0 -Wall -arch x86_64
-mmacosx-version-min=10.9 -Wno-nullability-completeness
-Wno-expansion-to-defined -Wno-undef-prefix -isysroot
/Applications/Xcode_12.4.app/Contents
Tobias Bergkvist added the comment:
It seems like _dyld_shared_cache_contains_path exists, while the define flag
HAVE_DYLD_SHARED_CACHE_CONTAINS_PATH has not been set.
Essentially, the define-flags being used does not seem to agree with the SDK
version you are using.
Could you try adding
Tobias Bergkvist added the comment:
I realised that I needed to define HAVE_DYLD_SHARED_CACHE_CONTAINS_PATH_RUNTIME
in the source file myself - as this is not defined after running the
configure-script. I've updated the PR and its description to only focus on the
legacy/deprecated app
Tobias Bergkvist added the comment:
This makes a lot of sense now.
Thank you so much for the thorough explanation Ned - and for highlighting where
my assumptions were wrong!
I didn’t realise I needed to specify MACOSX_DEPLOYMENT_TARGET to enable
backwards compatibility. Is there a reason
Tobias Bergkvist added the comment:
Okay, I decided to look into how I could do dynamic loading as you suggested.
Here is a POC (executable) for using _dyld_shared_cache_contains_path when
available:
```
#include
#include
void* libsystemb_handle;
typedef bool
Tobias Bergkvist added the comment:
You are absolutely right! From the manpage of dlopen(3) on MacOS Big Sur:
> dlopen() examines the mach-o file specified by path. If the file is
> compatible with the current process and has not already been loaded into the
> current process, it
Tobias Bergkvist added the comment:
An alternative to using _dyld_shared_cache_contains_path is to use dlopen to
check for library existence (which is what Apple recommends in their change
notes:
https://developer.apple.com/documentation/macos-release-notes/macos-big-sur-11_0_1-release
New submission from Tobias Bergkvist :
Python-binaries compiled on either Big Sur or Catalina - and moved to the other
MacOS-version will not work as expected when code depends on
ctypes.util.find_library.
Example symptom of this issue:
https://github.com/jupyterlab/jupyterlab/issues/9863
I
