Enable dyld interposing on Apple platforms when overriding#145
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octavonce merged 2 commits intopurpleprotocol:masterfrom Sep 17, 2025
Merged
Enable dyld interposing on Apple platforms when overriding#145octavonce merged 2 commits intopurpleprotocol:masterfrom
octavonce merged 2 commits intopurpleprotocol:masterfrom
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This currently fails on macOS.
Enables the MI_OSX_ZONE and MI_OSX_INTERPOSE flags. These allow using `malloc`/`free` on pointers returned from dynamic libraries (which will otherwise fail, as the dynamic libraries use the System allocator). These are enabled by default in mimalloc's CMakeLists.txt, but since we build without that, we need to specify these flags ourselves.
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We might need something similar to tikv/jemallocator#109 to truly make the |
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Actually, I went ahead and did that, see #146. |
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Great stuff 💯 |
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Define the
MI_OSX_ZONE=1andMI_OSX_INTERPOSE=1when compiling. These allow using e.g.libc::freeon pointers returned from dynamic libraries (which will otherwise fail, as the dynamic library would use the system allocator, while the current library would use mimalloc).These are enabled by default in mimalloc's
CMakeLists.txt, but since we build without that, we need to specify these flags ourselves.Implementation-wise, I added a test in the first commit that fails like the following, and which is fixed in the second commit.
$ cargo run -ptest-override-with-dylib --features override Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.05s Running `target/debug/test-override-with-dylib` test-override-with-dylib(15544,0x1f9c220c0) malloc: *** error for object 0x53d34040030: pointer being freed was not allocated test-override-with-dylib(15544,0x1f9c220c0) malloc: *** set a breakpoint in malloc_error_break to debug zsh: abort cargo run -ptest-override-with-dylib --features overrideRelated: #41