`libunwind` build system not picking up `LDFLAGS` causing build failure on systems without `zlib`

`LDFLAGS` is required for the linker to find bundled libraries 
https://github.com/JuliaLang/julia/blob/378f1920db0243224fbea8aea4e69ce36cd85173/Make.inc#L728

But `libunwind` build system is not passing it to the linker, causing configure/build failure on systems without `zlib`, for example the nixpkgs stdenv.
```
configure:3928: checking whether the C compiler works
configure:3950: gcc -m64   -U_FORTIFY_SOURCE -fPIC -lz     -Wl,-rpath,'$$ORIGIN' -Wl,-z,origin -Wl,-rpath-link,/build/julia-1.10.5/usr/lib -Wl,--enable-new-dtags  conftest.c  >&5
/nix/store/x7yyxvwy1f9hlx72rzrgx069jyf7hxwr-binutils-2.42/bin/ld: cannot find -lz: No such file or directory
```

Additionally, in https://github.com/JuliaLang/julia/pull/42782, `-lz` was added to `LIBUNWIND_CFLAGS` in `deps/unwind.mk`:
https://github.com/JuliaLang/julia/blob/378f1920db0243224fbea8aea4e69ce36cd85173/deps/unwind.mk#L6
But `-lz` is already handled by `libunwind` configure script:
https://github.com/libunwind/libunwind/blob/v1.5.0/configure.ac#L316

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`libunwind` build system not picking up `LDFLAGS` causing build failure on systems without `zlib` #55617

NickCao
openedon Aug 28, 2024

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libunwind build system not picking up LDFLAGS causing build failure on systems without zlib #55617

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NickCaoopenedon Aug 28, 2024

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