Hello,
We have a similar issue in Ubuntu:
https://bugs.launchpad.net/ubuntu/+source/rustc/+bug/2049904
To me this seems like a rust linking issue, the same C library
compiled with cc, then linked against a C stub program links just fine
for me.
In comparison rustc tries to be annoyingly clever and calls `cc` to
link with `-nodefaultlibs` and tries to manually provide all the
required libraries, which makes it fail.
The direct cause of the error is a library ordering issue, `-lc`
should always come after all C static libs and object files in a link
command, but it does not.
It seems that meson doesn't pass `-Clink-arg=-lc` to `rustc` at all by
default (which it probably shouldn't need to), and it's rustc itself
that emits `-lc` at the wrong location.
A workaround is as follows:
```
dep_libc = declare_dependency(link_args : '-lc')
l = static_library(
'c_accessing_zlib',
'c_accessing_zlib.c',
dependencies: [dep_zlib, dep_libc],
)
```
It is rather unweildly to read, but here's an example of an offending
link invocation by rustc:
```
LC_ALL="C" PATH="/usr/lib/rustlib/aarch64-unknown-linux-gnu/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin"
VSLANG="1033" "cc" "/tmp/rustcqxuAcC/symbols.o" "prog.p/prog.prog.3a9e8efe5d7989d1-cgu.0.rcgu.o" "prog.p/prog.2valzr4aprd78wdd.rcgu.o" "-Wl,--as-needed" "-L" "." "-L" "/usr/lib/rustlib/aarch64-unknown-linux-gnu/lib" "-Wl,-Bstatic" "/usr/lib/rustlib/aarch64-unknown-linux-gnu/lib/libstd-3f505df5bf7b6973.rlib" "/usr/lib/rustlib/aarch64-unknown-linux-gnu/lib/libpanic_unwind-f7bbfb2a4f0106ba.rlib"
"/usr/lib/rustlib/aarch64-unknown-linux-gnu/lib/libobject-799d4aa6228550fd.rlib"
"/usr/lib/rustlib/aarch64-unknown-linux-gnu/lib/libmemchr-817c1781430e6007.rlib"
"/usr/lib/rustlib/aarch64-unknown-linux-gnu/lib/libaddr2line-ad8936af23d8ece8.rlib"
"/usr/lib/rustlib/aarch64-unknown-linux-gnu/lib/libgimli-fa9ccab1157705c6.rlib" "/usr/lib/rustlib/aarch64-unknown-linux-gnu/lib/librustc_demangle-0f0344f8af442a24.rlib"
"/usr/lib/rustlib/aarch64-unknown-linux-gnu/lib/libstd_detect-f1d03073262366fd.rlib"
"/usr/lib/rustlib/aarch64-unknown-linux-gnu/lib/libhashbrown-d2b728fe429f73fd.rlib"
"/usr/lib/rustlib/aarch64-unknown-linux-gnu/lib/librustc_std_workspace_alloc-78f4eeade0e7b3f3.rlib"
"/usr/lib/rustlib/aarch64-unknown-linux-gnu/lib/libminiz_oxide-386abc7d4431b549.rlib"
"/usr/lib/rustlib/aarch64-unknown-linux-gnu/lib/libadler-f2fbe97df215d47a.rlib" "/usr/lib/rustlib/aarch64-unknown-linux-gnu/lib/libunwind-1b9c021e2652ca95.rlib"
"/usr/lib/rustlib/aarch64-unknown-linux-gnu/lib/libcfg_if-a31e7b8703ef1917.rlib"
"/usr/lib/rustlib/aarch64-unknown-linux-gnu/lib/liblibc-67315dfc1c311b62.rlib" "/usr/lib/rustlib/aarch64-unknown-linux-gnu/lib/liballoc-6f13ad92e9ef28f1.rlib" "/usr/lib/rustlib/aarch64-unknown-linux-gnu/lib/librustc_std_workspace_core-4647df6db5bfc191.rlib"
"/usr/lib/rustlib/aarch64-unknown-linux-gnu/lib/libcore-7ca28360f44e13c1.rlib" "/usr/lib/rustlib/aarch64-unknown-linux-gnu/lib/libcompiler_builtins-bda26fded9d4fbc7.rlib"
"-Wl,-Bdynamic" "-lgcc_s" "-lutil" "-lrt" "-lpthread" "-lm" "-ldl"
"-lc" "-Wl,--eh-frame-hdr" "-Wl,-z,noexecstack" "-L" "/usr/lib/rustlib/aarch64-unknown-linux-gnu/lib" "-o" "prog" "-Wl,--gc-sections" "-pie" "-Wl,-z,relro,-z,now" "-nodefaultlibs" "libc_accessing_zlib.a" "-lz"
```
Which was produced by the following rustc invocation:
```
rustc -C linker=cc --color=always -C debug-assertions=yes -C
overflow-checks=no --crate-type bin -g --crate-name prog --emit
dep-info=prog.d --emit link=prog --out-dir prog.p -C metadata=prog@exe -Clink-arg=libc_accessing_zlib.a -Clink-arg=-lz -L. ../prog.rs
```
As a note, same issue repros on the latest nightly rustc also.
Fixing rustc instead of meson is the real solution, but I don't think
this should be holding up meson migrating, as such I am attaching a
workaround patch similar to the one I have proposed for Ubuntu.
Mate Kukri
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--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)