Homebrew ld finds a lib, Rust 1.90 rust-lld can't

[ghenry]

Additional Info

• I am using Windows Subsystem for Linux

Output of brew config

HOMEBREW_VERSION: 4.6.15-58-g43fa5f5
ORIGIN: https://github.com/Homebrew/brew
HEAD: 43fa5f5e172c91b0642d1eb56435530969ba953f
Last commit: 9 days ago
Branch: master
Core tap HEAD: c40ad5184553b4ef493f7a2fc1e2f6a7c153ee71
Core tap last commit: 7 months ago
Core tap JSON: 03 Oct 14:44 UTC
HOMEBREW_PREFIX: /home/linuxbrew/.linuxbrew
HOMEBREW_CASK_OPTS: []
HOMEBREW_DISPLAY: :1
HOMEBREW_EDITOR: vim
HOMEBREW_FORBID_PACKAGES_FROM_PATHS: set
HOMEBREW_GITHUB_API_TOKEN: set
HOMEBREW_MAKE_JOBS: 12
HOMEBREW_SORBET_RUNTIME: set
Homebrew Ruby: 3.4.5 => /home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/vendor/portable-ruby/3.4.5/bin/ruby
CPU: dodeca-core 64-bit haswell
Clang: 21.1.2
Git: 2.51.0 => /home/linuxbrew/.linuxbrew/bin/git
Curl: 8.11.1 => /bin/curl
Kernel: Linux 6.16.7-200.fc42.x86_64 x86_64 GNU/Linux
OS: Fedora release 42 (Adams) (Adams)
Host glibc: 2.41
Host libstdc++: 6.0.34
/usr/bin/gcc: 15.2.1
/usr/bin/ruby: 3.4.5
glibc: N/A
gcc@12: 15.2.0
gcc: 15.2.0
xorg: N/A

Output of brew doctor

$ brew doctor
Please note that these warnings are just used to help the Homebrew maintainers
with debugging if you file an issue. If everything you use Homebrew for is
working fine: please don't worry or file an issue; just ignore this. Thanks!

Warning: Some installed kegs have no formulae!
This means they were either deleted or installed manually.
You should find replacements for the following formulae:
  [email protected]

Warning: Some installed formulae are deprecated or disabled.
You should find replacements for the following formulae:
  icu4c@76
  [email protected]
  [email protected]

Warning: Unbrewed header files were found in /usr/local/include.
If you didn't put them there on purpose they could cause problems when
building Homebrew formulae and may need to be deleted.

Unexpected header files:
  /usr/local/include/czmq.h
  /usr/local/include/czmq_library.h
  /usr/local/include/czmq_prelude.h
  /usr/local/include/mesode.h
  /usr/local/include/opendht.h
  /usr/local/include/opendht/*
  /usr/local/include/osip2/*
  /usr/local/include/osipparser2/*
  /usr/local/include/profapi.h
  /usr/local/include/sodium.h
  /usr/local/include/sodium/*
  /usr/local/include/sofia-sip-1.13/*
  /usr/local/include/spandsp.h
  /usr/local/include/spandsp/*
  /usr/local/include/strophe.h
  /usr/local/include/wx-3.0/*
  /usr/local/include/zactor.h
  /usr/local/include/zargs.h
  /usr/local/include/zarmour.h
  /usr/local/include/zauth.h
  /usr/local/include/zbeacon.h
  /usr/local/include/zcert.h
  /usr/local/include/zcertstore.h
  /usr/local/include/zchunk.h
  /usr/local/include/zclock.h
  /usr/local/include/zconfig.h
  /usr/local/include/zdigest.h
  /usr/local/include/zdir.h
  /usr/local/include/zdir_patch.h
  /usr/local/include/zfile.h
  /usr/local/include/zframe.h
  /usr/local/include/zgossip.h
  /usr/local/include/zhash.h
  /usr/local/include/zhashx.h
  /usr/local/include/zhttp_client.h
  /usr/local/include/zhttp_request.h
  /usr/local/include/zhttp_response.h
  /usr/local/include/zhttp_server.h
  /usr/local/include/zhttp_server_options.h
  /usr/local/include/ziflist.h
  /usr/local/include/zlist.h
  /usr/local/include/zlistx.h
  /usr/local/include/zloop.h
  /usr/local/include/zmonitor.h
  /usr/local/include/zmq.h
  /usr/local/include/zmq_utils.h
  /usr/local/include/zmsg.h
  /usr/local/include/zosc.h
  /usr/local/include/zpoller.h
  /usr/local/include/zproc.h
  /usr/local/include/zproxy.h
  /usr/local/include/zrex.h
  /usr/local/include/zsock.h
  /usr/local/include/zstr.h
  /usr/local/include/zsys.h
  /usr/local/include/ztimerset.h
  /usr/local/include/ztrie.h
  /usr/local/include/zuuid.h
  /usr/local/include/zyre.h
  /usr/local/include/zyre_event.h
  /usr/local/include/zyre_library.h

Warning: Unbrewed '.la' files were found in /usr/local/lib.
If you didn't put them there on purpose they could cause problems when
building Homebrew formulae and may need to be deleted.

Unexpected '.la' files:
  /usr/local/lib/libczmq.la
  /usr/local/lib/libmesode.la
  /usr/local/lib/libosip2.la
  /usr/local/lib/libosipparser2.la
  /usr/local/lib/libprofanity.la
  /usr/local/lib/libsodium.la
  /usr/local/lib/libsofia-sip-ua-glib.la
  /usr/local/lib/libsofia-sip-ua.la
  /usr/local/lib/libspandsp.la
  /usr/local/lib/libstrophe.la
  /usr/local/lib/libzmq.la
  /usr/local/lib/libzyre.la

Warning: Unbrewed '.pc' files were found in /usr/local/lib/pkgconfig.
If you didn't put them there on purpose they could cause problems when
building Homebrew formulae and may need to be deleted.

Unexpected '.pc' files:
  /usr/local/lib/pkgconfig/libczmq.pc
  /usr/local/lib/pkgconfig/libmesode.pc
  /usr/local/lib/pkgconfig/libosip2.pc
  /usr/local/lib/pkgconfig/libsodium.pc
  /usr/local/lib/pkgconfig/libstrophe.pc
  /usr/local/lib/pkgconfig/libzmq.pc
  /usr/local/lib/pkgconfig/libzyre.pc
  /usr/local/lib/pkgconfig/sofia-sip-ua-glib.pc
  /usr/local/lib/pkgconfig/sofia-sip-ua.pc
  /usr/local/lib/pkgconfig/spandsp.pc

Warning: Unbrewed static libraries were found in /usr/local/lib.
If you didn't put them there on purpose they could cause problems when
building Homebrew formulae and may need to be deleted.

Unexpected static libraries:
  /usr/local/lib/libczmq.a
  /usr/local/lib/libmesode.a
  /usr/local/lib/libosip2.a
  /usr/local/lib/libosipparser2.a
  /usr/local/lib/libsodium.a
  /usr/local/lib/libsofia-sip-ua-glib.a
  /usr/local/lib/libsofia-sip-ua.a
  /usr/local/lib/libspandsp.a
  /usr/local/lib/libstrophe.a
  /usr/local/lib/libzmq.a
  /usr/local/lib/libzyre.a

Description of issue

rust-lld can't find a system wide lib. homebrew ld can. Is there an embedded sysroot or search path?

I'm trying to debug the following as per my Rust issue - rust-lang/rust#147329

$ which rustc
~/.cargo/bin/rustc
$ rustc --version
rustc 1.90.0 (1159e78c4 2025-09-14)

$ echo "fn main() {}" > /tmp/a.rs
$ rustc -losipparser2 /tmp/a.rs
error: linking with `cc` failed: exit status: 1
  |
  = note:  "cc" "-m64" "/tmp/rustcvkvxXJ/symbols.o" "<2 object files omitted>" "-Wl,--as-needed" "-Wl,-Bdynamic" "-losipparser2" "-Wl,-Bstatic" "<sysroot>/lib/rustlib/x86_64-unknown-linux-gnu/lib/{libstd-*,libpanic_unwind-*,libobject-*,libmemchr-*,libaddr2line-*,libgimli-*,librustc_demangle-*,libstd_detect-*,libhashbrown-*,librustc_std_workspace_alloc-*,libminiz_oxide-*,libadler2-*,libunwind-*,libcfg_if-*,liblibc-*,librustc_std_workspace_core-*,liballoc-*,libcore-*,libcompiler_builtins-*}.rlib" "-Wl,-Bdynamic" "-lgcc_s" "-lutil" "-lrt" "-lpthread" "-lm" "-ldl" "-lc" "-L" "/tmp/rustcvkvxXJ/raw-dylibs" "-B<sysroot>/lib/rustlib/x86_64-unknown-linux-gnu/bin/gcc-ld" "-fuse-ld=lld" "-Wl,--eh-frame-hdr" "-Wl,-z,noexecstack" "-L" "<sysroot>/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-o" "a" "-Wl,--gc-sections" "-pie" "-Wl,-z,relro,-z,now" "-nodefaultlibs"
  = note: some arguments are omitted. use `--verbose` to show all linker arguments
  = note: rust-lld: error: unable to find library -losipparser2
          collect2: error: ld returned 1 exit status

vs which works and uses ld from homebrew.

$ rustc -Clinker-features=-lld -losipparser2 /tmp/a.rs

Thanks.