improve MacOS interposes to make mimalloc compile for older MacOS #1028
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I've got a failure while trying to compile with "-mmacosx-version-min=10.7" since MAC_OS_X_VERSION_MAX_ALLOWED is greater than MAC_OS_X_VERSION_10_15 but still we can't use `aligned_alloc` since of the lower bound (10.7). I'm not sure about internal details of how `__OSX_AVAILABLE` works, but my hope is the it would only make this interpose available starting from the OS version specified. Also, it helps me to compile mimalloc with "-mmacosx-version-min=10.7".
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Hey @daanx - could you check this change once again, please? |
| MI_INTERPOSE_MI(calloc), | ||
| MI_INTERPOSE_MI(realloc), | ||
| MI_INTERPOSE_MI(strdup), | ||
| #if defined(MAC_OS_X_VERSION_10_7) && MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_7 |
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I don't think it's worth deleting it.
Instead replace all MAC_OS_X_VERSION_MAX_ALLOWED with MAC_OS_X_VERSION_MIN_REQUIRED in this file (or better yet, everywhere else in this repository).
FYI read thread in this pull request: hacl-star/hacl-star#1042
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I've god runtime error when I've done this. See #1028 (comment)
| MI_INTERPOSE_FUN(vfree,mi_cfree), | ||
| #endif | ||
| }; | ||
| __attribute__((used)) static struct mi_interpose_s _mi_interposes_10_7[] |
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It also seems redundant.
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Applying availability attribute to a declaration is a different thing. It should make this declaration conditionally accessible (weakly linked).
I've got this info from here: https://epir.at/2019/10/30/api-availability-and-target-conditionals/
A declaration can typically be used even when deploying back to a platform version prior to when the declaration was introduced. When this happens, the declaration is weakly linked, as if the weak_import attribute were added to the declaration. A weakly-linked declaration may or may not be present a run-time, and a program can determine whether the declaration is present by checking whether the address of that declaration is non-NULL
In reality, I was observing a crash on modern MacOSes with the current compile time exclusion of such interposes, but it works fine when is a separate decl.
Because |
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I took this PR and manually integrated it. Let me know if this works for you @Noxybot. Thanks! |
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I've got a failure while trying to compile with "-mmacosx-version-min=10.7" since MAC_OS_X_VERSION_MAX_ALLOWED is greater than MAC_OS_X_VERSION_10_15 but still we can't use
aligned_allocsince of the lower bound (10.7). I'm not sure about internal details of how__OSX_AVAILABLEworks, but my hope is the it would only make this interpose available starting from the OS version specified. Also, it helps me to compile mimalloc with "-mmacosx-version-min=10.7".