question for marcus about rust's compiler_builtins and macosx_deployment_target

Wed May 29 14:10:43 UTC 2024

hi marcus,

thanks for getting back to me.

what i find interesting is, in spite of your 10.14 target, the macports rust compiler seems to reduce the warnings compared to the firefox toolchain’s (which uses a 10.12 target).

for example these are the warnings when i use the firefox toolchain:

> 33:12.47 security/manager/ssl/builtins/dynamic-library/libnssckbi.dylib
> 33:12.53 ld64.lld: warning: ../../../../../x86_64-apple-darwin/release/libbuiltins_static.a(std-b3629cc59bb38ebe.std.991b467e8ac0a4ad-cgu.0.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
> 33:12.54 ld64.lld: warning: ../../../../../x86_64-apple-darwin/release/libbuiltins_static.a(panic_abort-e0744c14fcbc8bcc.panic_abort.c40177b90b1e9efd-cgu.0.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
> 33:12.54 ld64.lld: warning: ../../../../../x86_64-apple-darwin/release/libbuiltins_static.a(object-5c7ad728062c8a84.object.804ec97e1ad5a55c-cgu.0.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
> 33:12.54 ld64.lld: warning: ../../../../../x86_64-apple-darwin/release/libbuiltins_static.a(memchr-90583dbfcd2cd9d8.memchr.5e40ebe02bc7fee7-cgu.0.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
> 33:12.55 ld64.lld: warning: ../../../../../x86_64-apple-darwin/release/libbuiltins_static.a(addr2line-f8a104b41642d585.addr2line.738d67e118a72e5c-cgu.0.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
> 33:12.55 ld64.lld: warning: ../../../../../x86_64-apple-darwin/release/libbuiltins_static.a(gimli-2dd3c1cbaa8c6ac2.gimli.25cd2fd39526eafa-cgu.0.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
> 33:12.55 ld64.lld: warning: ../../../../../x86_64-apple-darwin/release/libbuiltins_static.a(rustc_demangle-4b94f82697827b68.rustc_demangle.f3e6ea9654b87c89-cgu.0.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
> 33:12.55 ld64.lld: warning: ../../../../../x86_64-apple-darwin/release/libbuiltins_static.a(alloc-81d461325d712857.alloc.803e2326cde23ec3-cgu.0.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
> 33:12.56 ld64.lld: warning: ../../../../../x86_64-apple-darwin/release/libbuiltins_static.a(core-4015b3a6e383e0ad.core.b03ae248d863ca2a-cgu.0.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
> 33:12.56 ld64.lld: warning: ../../../../../x86_64-apple-darwin/release/libbuiltins_static.a(compiler_builtins-d6175b4ffbd6f2cb.compiler_builtins.c536cea08157bc6d-cgu.035.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0

> 33:24.34 ld64.lld: warning: ../../../../../x86_64-apple-darwin/release/libipcclientcerts_static.a(std-b3629cc59bb38ebe.std.991b467e8ac0a4ad-cgu.0.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
> 33:24.35 ld64.lld: warning: ../../../../../x86_64-apple-darwin/release/libipcclientcerts_static.a(panic_abort-e0744c14fcbc8bcc.panic_abort.c40177b90b1e9efd-cgu.0.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
> 33:24.35 ld64.lld: warning: ../../../../../x86_64-apple-darwin/release/libipcclientcerts_static.a(object-5c7ad728062c8a84.object.804ec97e1ad5a55c-cgu.0.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
> 33:24.35 ld64.lld: warning: ../../../../../x86_64-apple-darwin/release/libipcclientcerts_static.a(memchr-90583dbfcd2cd9d8.memchr.5e40ebe02bc7fee7-cgu.0.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
> 33:24.35 ld64.lld: warning: ../../../../../x86_64-apple-darwin/release/libipcclientcerts_static.a(addr2line-f8a104b41642d585.addr2line.738d67e118a72e5c-cgu.0.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
> 33:24.36 ld64.lld: warning: ../../../../../x86_64-apple-darwin/release/libipcclientcerts_static.a(gimli-2dd3c1cbaa8c6ac2.gimli.25cd2fd39526eafa-cgu.0.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
> 33:24.36 ld64.lld: warning: ../../../../../x86_64-apple-darwin/release/libipcclientcerts_static.a(rustc_demangle-4b94f82697827b68.rustc_demangle.f3e6ea9654b87c89-cgu.0.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
> 33:24.36 ld64.lld: warning: ../../../../../x86_64-apple-darwin/release/libipcclientcerts_static.a(alloc-81d461325d712857.alloc.803e2326cde23ec3-cgu.0.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
> 33:24.36 ld64.lld: warning: ../../../../../x86_64-apple-darwin/release/libipcclientcerts_static.a(core-4015b3a6e383e0ad.core.b03ae248d863ca2a-cgu.0.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
> 33:24.37 ld64.lld: warning: ../../../../../x86_64-apple-darwin/release/libipcclientcerts_static.a(compiler_builtins-d6175b4ffbd6f2cb.compiler_builtins.c536cea08157bc6d-cgu.035.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
> 33:35.81 ld64.lld: warning: ../../../../../x86_64-apple-darwin/release/libosclientcerts_static.a(std-b3629cc59bb38ebe.std.991b467e8ac0a4ad-cgu.0.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
> 33:35.81 ld64.lld: warning: ../../../../../x86_64-apple-darwin/release/libosclientcerts_static.a(panic_abort-e0744c14fcbc8bcc.panic_abort.c40177b90b1e9efd-cgu.0.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
> 33:35.82 ld64.lld: warning: ../../../../../x86_64-apple-darwin/release/libosclientcerts_static.a(object-5c7ad728062c8a84.object.804ec97e1ad5a55c-cgu.0.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
> 33:35.82 ld64.lld: warning: ../../../../../x86_64-apple-darwin/release/libosclientcerts_static.a(memchr-90583dbfcd2cd9d8.memchr.5e40ebe02bc7fee7-cgu.0.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
> 33:35.82 ld64.lld: warning: ../../../../../x86_64-apple-darwin/release/libosclientcerts_static.a(addr2line-f8a104b41642d585.addr2line.738d67e118a72e5c-cgu.0.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
> 33:35.82 ld64.lld: warning: ../../../../../x86_64-apple-darwin/release/libosclientcerts_static.a(gimli-2dd3c1cbaa8c6ac2.gimli.25cd2fd39526eafa-cgu.0.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
> 33:35.83 ld64.lld: warning: ../../../../../x86_64-apple-darwin/release/libosclientcerts_static.a(rustc_demangle-4b94f82697827b68.rustc_demangle.f3e6ea9654b87c89-cgu.0.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
> 33:35.83 ld64.lld: warning: ../../../../../x86_64-apple-darwin/release/libosclientcerts_static.a(hashbrown-8983e26402bf8df3.hashbrown.c235b46fdb144bda-cgu.0.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
> 33:35.83 ld64.lld: warning: ../../../../../x86_64-apple-darwin/release/libosclientcerts_static.a(alloc-81d461325d712857.alloc.803e2326cde23ec3-cgu.0.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
> 33:35.83 ld64.lld: warning: ../../../../../x86_64-apple-darwin/release/libosclientcerts_static.a(core-4015b3a6e383e0ad.core.b03ae248d863ca2a-cgu.0.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
> 33:35.84 ld64.lld: warning: ../../../../../x86_64-apple-darwin/release/libosclientcerts_static.a(compiler_builtins-d6175b4ffbd6f2cb.compiler_builtins.c536cea08157bc6d-cgu.035.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0

and

> 35:18.49 ld64.lld: warning: ../../../x86_64-apple-darwin/release/libgkrust.a(std-b3629cc59bb38ebe.std.991b467e8ac0a4ad-cgu.0.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
> 35:18.50 ld64.lld: warning: ../../../x86_64-apple-darwin/release/libgkrust.a(panic_abort-e0744c14fcbc8bcc.panic_abort.c40177b90b1e9efd-cgu.0.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
> 35:18.50 ld64.lld: warning: ../../../x86_64-apple-darwin/release/libgkrust.a(object-5c7ad728062c8a84.object.804ec97e1ad5a55c-cgu.0.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
> 35:18.51 ld64.lld: warning: ../../../x86_64-apple-darwin/release/libgkrust.a(memchr-90583dbfcd2cd9d8.memchr.5e40ebe02bc7fee7-cgu.0.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
> 35:18.51 ld64.lld: warning: ../../../x86_64-apple-darwin/release/libgkrust.a(addr2line-f8a104b41642d585.addr2line.738d67e118a72e5c-cgu.0.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
> 35:18.51 ld64.lld: warning: ../../../x86_64-apple-darwin/release/libgkrust.a(gimli-2dd3c1cbaa8c6ac2.gimli.25cd2fd39526eafa-cgu.0.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
> 35:18.51 ld64.lld: warning: ../../../x86_64-apple-darwin/release/libgkrust.a(rustc_demangle-4b94f82697827b68.rustc_demangle.f3e6ea9654b87c89-cgu.0.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
> 35:18.52 ld64.lld: warning: ../../../x86_64-apple-darwin/release/libgkrust.a(std_detect-526c5fbf4504f5c2.std_detect.cc21ff6764f76c21-cgu.0.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
> 35:18.52 ld64.lld: warning: ../../../x86_64-apple-darwin/release/libgkrust.a(hashbrown-8983e26402bf8df3.hashbrown.c235b46fdb144bda-cgu.0.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
> 35:18.52 ld64.lld: warning: ../../../x86_64-apple-darwin/release/libgkrust.a(alloc-81d461325d712857.alloc.803e2326cde23ec3-cgu.0.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
> 35:18.52 ld64.lld: warning: ../../../x86_64-apple-darwin/release/libgkrust.a(core-4015b3a6e383e0ad.core.b03ae248d863ca2a-cgu.0.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
> 35:18.53 ld64.lld: warning: ../../../x86_64-apple-darwin/release/libgkrust.a(compiler_builtins-d6175b4ffbd6f2cb.compiler_builtins.c536cea08157bc6d-cgu.021.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
> 35:18.53 ld64.lld: warning: ../../../x86_64-apple-darwin/release/libgkrust.a(compiler_builtins-d6175b4ffbd6f2cb.compiler_builtins.c536cea08157bc6d-cgu.027.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
> 35:18.53 ld64.lld: warning: ../../../x86_64-apple-darwin/release/libgkrust.a(compiler_builtins-d6175b4ffbd6f2cb.compiler_builtins.c536cea08157bc6d-cgu.034.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
> 35:18.53 ld64.lld: warning: ../../../x86_64-apple-darwin/release/libgkrust.a(compiler_builtins-d6175b4ffbd6f2cb.compiler_builtins.c536cea08157bc6d-cgu.035.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
> 35:18.54 ld64.lld: warning: ../../../x86_64-apple-darwin/release/libgkrust.a(compiler_builtins-d6175b4ffbd6f2cb.compiler_builtins.c536cea08157bc6d-cgu.061.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
> 35:18.54 ld64.lld: warning: ../../../x86_64-apple-darwin/release/libgkrust.a(compiler_builtins-d6175b4ffbd6f2cb.compiler_builtins.c536cea08157bc6d-cgu.080.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
> 35:18.54 ld64.lld: warning: ../../../x86_64-apple-darwin/release/libgkrust.a(compiler_builtins-d6175b4ffbd6f2cb.compiler_builtins.c536cea08157bc6d-cgu.084.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
> 35:18.54 ld64.lld: warning: ../../../x86_64-apple-darwin/release/libgkrust.a(compiler_builtins-d6175b4ffbd6f2cb.compiler_builtins.c536cea08157bc6d-cgu.097.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
> 35:18.54 ld64.lld: warning: ../../../x86_64-apple-darwin/release/libgkrust.a(compiler_builtins-d6175b4ffbd6f2cb.compiler_builtins.c536cea08157bc6d-cgu.008.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
> 35:18.55 ld64.lld: warning: ../../../x86_64-apple-darwin/release/libgkrust.a(compiler_builtins-d6175b4ffbd6f2cb.compiler_builtins.c536cea08157bc6d-cgu.101.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0

with your rust, however, all of the certificate warnings go away and gkrust reduces to:

> 39:46.15 ld64.lld: warning: ../../../x86_64-apple-darwin/release/libgkrust.a(compiler_builtins-9cb18af985855d85.compiler_builtins.c6cfb3b2f9a41198-cgu.046.rcgu.o) has version 10.14.0, which is newer than target minimum of 10.9.0
> 39:46.15 ld64.lld: warning: ../../../x86_64-apple-darwin/release/libgkrust.a(compiler_builtins-9cb18af985855d85.compiler_builtins.c6cfb3b2f9a41198-cgu.088.rcgu.o) has version 10.14.0, which is newer than target minimum of 10.9.0
> 39:46.16 ld64.lld: warning: ../../../x86_64-apple-darwin/release/libgkrust.a(compiler_builtins-9cb18af985855d85.compiler_builtins.c6cfb3b2f9a41198-cgu.095.rcgu.o) has version 10.14.0, which is newer than target minimum of 10.9.0
> 39:46.16 ld64.lld: warning: ../../../x86_64-apple-darwin/release/libgkrust.a(compiler_builtins-9cb18af985855d85.compiler_builtins.c6cfb3b2f9a41198-cgu.106.rcgu.o) has version 10.14.0, which is newer than target minimum of 10.9.0

the mozilla build system isn’t too tricky.

it uses a moz.build file and the rust stuff that is triggering these warnings is here:

https://hg.mozilla.org/mozilla-unified/file/tip/toolkit/library/rust <https://hg.mozilla.org/mozilla-unified/file/tip/toolkit/library/rust>
https://hg.mozilla.org/mozilla-unified/file/tip/toolkit/library/rust/moz.build <https://hg.mozilla.org/mozilla-unified/file/tip/toolkit/library/rust/moz.build>
https://hg.mozilla.org/mozilla-unified/log/tip/toolkit/library/rust/lib.rs <https://hg.mozilla.org/mozilla-unified/log/tip/toolkit/library/rust/lib.rs>

i note that the lib.rs <http://lib.rs/> file hasn’t been changed since 2016. it is my hope that i can add some argument or modify the moz.build to remove the last 4 warnings.

what motivated me to ask this question on the list is that somehow, even with a higher deployment target for your build, the majority of warnings how now disappeared in spite of my deployment target being 10.9

i want to believe that there can be some small changes (in the form of a compile-time argument) that can enforce 10.9 compatibility to make these last 4 warnings go away.

Thanks,
Gagan

> On May 28, 2024, at 11:16 PM, mcalhoun at macports.org wrote:
> 
> Greetings.
> 
> I am afraid it is very difficult to answer this question without having a much greater insight into Firefox builds.
> I am not quite sure what libgkrust.a is, but if it is copying files from the Rust supplied libcompiler_builtins-xxx.rlib, then it would make sense that there would be a discrepancy.
> Rust was built with MACOSX_DEPLOYMENT_TARGET=10.14 because that is the host system.
> If that is indeed the case, the only way I can think to eliminate the warnings is to recompile rust from source with `macos_version=10.9` and perhaps `os.major=13`.
> However, this is untested and unsupported.
> 
> -Marcus
> 
>> On May 27, 2024, at 11:55 AM, Gagan Sidhu via macports-dev <macports-dev at lists.macports.org> wrote:
>> 
>> hi marcus
>> 
>> i’m working on making a firefox that works all the way back to 10.9
>> 
>> right now i am using it on 10.14 without issue, and i think the only thing left is ensuring rust honours my macosx_deployment_target
>> 
>> it seems rustc from macports (1.77.1) honours this variable for the most part, but i noticed one unusual thing.
>> 
>> when i use the mozilla toolchain’s rust (1.78), which has an implicit minimum of 10.12, i would get this:
>> 
>>> 34:32.52 ld64.lld: warning: ../../../x86_64-apple-darwin/release/libgkrust.a(std-b3629cc59bb38ebe.std.991b467e8ac0a4ad-cgu.0.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
>>> 34:32.52 ld64.lld: warning: ../../../x86_64-apple-darwin/release/libgkrust.a(panic_abort-e0744c14fcbc8bcc.panic_abort.c40177b90b1e9efd-cgu.0.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
>>> 34:32.52 ld64.lld: warning: ../../../x86_64-apple-darwin/release/libgkrust.a(object-5c7ad728062c8a84.object.804ec97e1ad5a55c-cgu.0.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
>>> 34:32.53 ld64.lld: warning: ../../../x86_64-apple-darwin/release/libgkrust.a(memchr-90583dbfcd2cd9d8.memchr.5e40ebe02bc7fee7-cgu.0.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
>>> 34:32.53 ld64.lld: warning: ../../../x86_64-apple-darwin/release/libgkrust.a(addr2line-f8a104b41642d585.addr2line.738d67e118a72e5c-cgu.0.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
>>> 34:32.53 ld64.lld: warning: ../../../x86_64-apple-darwin/release/libgkrust.a(gimli-2dd3c1cbaa8c6ac2.gimli.25cd2fd39526eafa-cgu.0.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
>>> 34:32.53 ld64.lld: warning: ../../../x86_64-apple-darwin/release/libgkrust.a(rustc_demangle-4b94f82697827b68.rustc_demangle.f3e6ea9654b87c89-cgu.0.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
>>> 34:32.54 ld64.lld: warning: ../../../x86_64-apple-darwin/release/libgkrust.a(std_detect-526c5fbf4504f5c2.std_detect.cc21ff6764f76c21-cgu.0.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
>>> 34:32.54 ld64.lld: warning: ../../../x86_64-apple-darwin/release/libgkrust.a(hashbrown-8983e26402bf8df3.hashbrown.c235b46fdb144bda-cgu.0.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
>>> 34:32.55 ld64.lld: warning: ../../../x86_64-apple-darwin/release/libgkrust.a(alloc-81d461325d712857.alloc.803e2326cde23ec3-cgu.0.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
>>> 34:32.55 ld64.lld: warning: ../../../x86_64-apple-darwin/release/libgkrust.a(core-4015b3a6e383e0ad.core.b03ae248d863ca2a-cgu.0.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
>>> 34:32.55 ld64.lld: warning: ../../../x86_64-apple-darwin/release/libgkrust.a(compiler_builtins-d6175b4ffbd6f2cb.compiler_builtins.c536cea08157bc6d-cgu.021.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
>>> 34:32.55 ld64.lld: warning: ../../../x86_64-apple-darwin/release/libgkrust.a(compiler_builtins-d6175b4ffbd6f2cb.compiler_builtins.c536cea08157bc6d-cgu.027.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
>>> 34:32.56 ld64.lld: warning: ../../../x86_64-apple-darwin/release/libgkrust.a(compiler_builtins-d6175b4ffbd6f2cb.compiler_builtins.c536cea08157bc6d-cgu.034.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
>>> 34:32.56 ld64.lld: warning: ../../../x86_64-apple-darwin/release/libgkrust.a(compiler_builtins-d6175b4ffbd6f2cb.compiler_builtins.c536cea08157bc6d-cgu.035.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
>>> 34:32.56 ld64.lld: warning: ../../../x86_64-apple-darwin/release/libgkrust.a(compiler_builtins-d6175b4ffbd6f2cb.compiler_builtins.c536cea08157bc6d-cgu.061.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
>>> 34:32.56 ld64.lld: warning: ../../../x86_64-apple-darwin/release/libgkrust.a(compiler_builtins-d6175b4ffbd6f2cb.compiler_builtins.c536cea08157bc6d-cgu.080.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
>>> 34:32.57 ld64.lld: warning: ../../../x86_64-apple-darwin/release/libgkrust.a(compiler_builtins-d6175b4ffbd6f2cb.compiler_builtins.c536cea08157bc6d-cgu.084.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
>>> 34:32.57 ld64.lld: warning: ../../../x86_64-apple-darwin/release/libgkrust.a(compiler_builtins-d6175b4ffbd6f2cb.compiler_builtins.c536cea08157bc6d-cgu.097.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
>>> 34:32.57 ld64.lld: warning: ../../../x86_64-apple-darwin/release/libgkrust.a(compiler_builtins-d6175b4ffbd6f2cb.compiler_builtins.c536cea08157bc6d-cgu.008.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
>>> 34:32.57 ld64.lld: warning: ../../../x86_64-apple-darwin/release/libgkrust.a(compiler_builtins-d6175b4ffbd6f2cb.compiler_builtins.c536cea08157bc6d-cgu.101.rcgu.o) has version 10.12.0, which is newer than target minimum of 10.9.0
>> 
>> 
>> but when i use the macports rust, i get this:
>>> 1:37.62 ld64.lld: warning: ../../../x86_64-apple-darwin/release/libgkrust.a(compiler_builtins-5cf596999632f69b.compiler_builtins.5e29af35305e20ca-cgu.045.rcgu.o) has version 10.14.0, which is newer than target minimum of 10.9.0
>>> 1:37.62 ld64.lld: warning: ../../../x86_64-apple-darwin/release/libgkrust.a(compiler_builtins-5cf596999632f69b.compiler_builtins.5e29af35305e20ca-cgu.053.rcgu.o) has version 10.14.0, which is newer than target minimum of 10.9.0
>>> 1:37.63 ld64.lld: warning: ../../../x86_64-apple-darwin/release/libgkrust.a(compiler_builtins-5cf596999632f69b.compiler_builtins.5e29af35305e20ca-cgu.060.rcgu.o) has version 10.14.0, which is newer than target minimum of 10.9.0
>>> 1:37.63 ld64.lld: warning: ../../../x86_64-apple-darwin/release/libgkrust.a(compiler_builtins-5cf596999632f69b.compiler_builtins.5e29af35305e20ca-cgu.068.rcgu.o) has version 10.14.0, which is newer than target minimum of 10.9.0
>>> 
>> obviously the macports version is much better, since it has reduced the number of warnings. but i found it unusual that it still left 4 compiler_builtins at a version higher than the mozilla rust.
>> 
>> is there any insight i could provide, or maybe you could share, that could help me remove these last 4 warnings?
>> 
>> Thanks,
>> Gagan
>> 
> 

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