Hi, Sergey,

Thanks for updates, LGTM

Hi, Sergey!
Thanks for the review!

See my answers below.

On 26.11.25, Sergey Bronnikov wrote:

Hi, Sergey,

thanks for the patch! LGTM with a minor comment.

Sergey

On 11/24/25 23:26, Sergey Kaplun wrote:

From: Mike Pall <mike>

Thanks to Carlo Cabrera.

(cherry picked from commit b2915e9ab55b999429b4d1931097064c4e17de53)

The previous commit removes emitting the `.subsections_via_symbols` [1]
directive for macOS. Nevertheless, the aforementioned Xcode linker
versions produce incorrect code for the VM without this directive.

As a fix for old versions of macOS, this patch adds emitting this

I would add exact macOS versions, according to [1] it is: 15000000
1. 

As discussed offline, this is exactly the problem with the Xcode
version, and this macro specifies the corresponding Xcode versions.

https://stackoverflow.com/questions/19387043/how-can-i-reliably-detect-the-version-of-clang-at-preprocessing-time#comment137533353_19391724 

directive in the buildvm.

[1]:https://reviews.llvm.org/D79926

Sergey Kaplun:
* added the description for the problem

Part of tarantool/tarantool#11691

I've added the link to the machO format as you suggested:

| macOS: Workaround for buggy XCode 15.0 - 15.2 linker.
|
| Thanks to Carlo Cabrera.
|
| (cherry picked from commit b2915e9ab55b999429b4d1931097064c4e17de53)
|
| The previous commit removes emitting the `.subsections_via_symbols`
| [1][2] directive for macOS. Nevertheless, the aforementioned Xcode linker
| versions produce incorrect code for the VM without this directive.
|
| As a fix for old versions of macOS, this patch adds emitting this
| directive in the buildvm.
|
| [1]: https://reviews.llvm.org/D79926
| [2]: https://github.com/aidansteele/osx-abi-macho-file-format-reference
|
| Sergey Kaplun:
| * added the description for the problem
|
| Part of tarantool/tarantool#11691

---
  src/host/buildvm_asm.c | 4 ++++
  1 file changed, 4 insertions(+)

diff --git a/src/host/buildvm_asm.c b/src/host/buildvm_asm.c
index 43595b31..fc09d71a 100644
--- a/src/host/buildvm_asm.c
+++ b/src/host/buildvm_asm.c
@@ -347,6 +347,10 @@ void emit_asm(BuildCtx *ctx)
      fprintf(ctx->fp, "\t.ident \"%s\"\n", ctx->dasm_ident);
      break;
    case BUILD_machasm:
+#if defined(__apple_build_version__) && __apple_build_version__ >= 15000000 && __apple_build_version__ < 15000300
+    /* Workaround for XCode 15.0 - 15.2. */

__apple_build_version__ defines a macOS version. But macOS 15 includes 
XCode 16, see [2], not 15.x

So there is an inconsistency in condition and comment. I would list 
macOS versions in a comment like this

"Workaround for macOS 15, 15.1 and 15.2" to avoid misinterpretation due 
to non-strict inequality with 15000300.

Also, I would include a link to [2] to the commit message.

2. 
https://developer.apple.com/documentation/macos-release-notes/macos-15-release-notes

The same about the comment above.

+    fprintf(ctx->fp, "\t.subsections_via_symbols\n");
+#endif
      fprintf(ctx->fp,
        "\t.cstring\n"
        "\t.ascii \"%s\\0\"\n", ctx->dasm_ident);