Use fat-macho crate to create universal library

[messense]

Not sure if this is desired, opening this PR for discussion, :-)

https://github.com/messense/fat-macho-rs

[messense]

Apparently some offset is wrong with archive files in the universal library, will investigate and fix it later.

[TimNN]

Thanks for the PR, @messense! I've moved the CI fixes to #48, thanks for those!

Could you describe what you see as the benefits and drawbacks for using fat-macho?

[messense]

fat-macho is basically a pure Rust implementation of lipo, it runs on macOS, Linux and Windows makes it easier for cross compiling on non-macOS machine. But it's a pretty new project, not as battle tested as lipo.

[messense]

Interesting, the Xcode integration tests failed locally on my Mac (Big Sur 11.2) iphonesimulator14.4, but it works on CI?

[INFO  cargo_lipo::meta] Will build universal library for ["static1", "static2build", "static3bin"]
   [INFO  cargo_lipo::lipo] Building "static1" for "aarch64-apple-ios"
      Compiling normal v0.1.0 (/Users/messense/Projects/cargo-lipo/testdata/workspace/normal)
      Compiling static1 v0.1.0 (/Users/messense/Projects/cargo-lipo/testdata/workspace/static1)
       Finished dev [unoptimized + debuginfo] target(s) in 1.37s
   [INFO  cargo_lipo::lipo] Building "static1" for "x86_64-apple-ios"
      Compiling normal v0.1.0 (/Users/messense/Projects/cargo-lipo/testdata/workspace/normal)
      Compiling static1 v0.1.0 (/Users/messense/Projects/cargo-lipo/testdata/workspace/static1)
       Finished dev [unoptimized + debuginfo] target(s) in 0.98s
   [INFO  cargo_lipo::lipo] Creating universal library for static1
   [INFO  cargo_lipo::lipo] Building "static2build" for "aarch64-apple-ios"
      Compiling buildutil v0.1.0 (/Users/messense/Projects/cargo-lipo/testdata/workspace/buildutil)
      Compiling static2build v0.1.0 (/Users/messense/Projects/cargo-lipo/testdata/workspace/static2build)
   error: linking with `cc` failed: exit code: 1
     |
     = note: "cc" "-m64" "-arch" "x86_64" "-L" "/Users/messense/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib" "/Users/messense/Projects/cargo-lipo/testdata/workspace/target/debug/build/static2build-848f0bcf35cf67ad/build_script_build-848f0bcf35cf67ad.17r2cb9hhpqll36a.rcgu.o" "/Users/messense/Projects/cargo-lipo/testdata/workspace/target/debug/build/static2build-848f0bcf35cf67ad/build_script_build-848f0bcf35cf67ad.24lsk5gx18bbgekq.rcgu.o" "/Users/messense/Projects/cargo-lipo/testdata/workspace/target/debug/build/static2build-848f0bcf35cf67ad/build_script_build-848f0bcf35cf67ad.26xj0k3esrebjng0.rcgu.o" "/Users/messense/Projects/cargo-lipo/testdata/workspace/target/debug/build/static2build-848f0bcf35cf67ad/build_script_build-848f0bcf35cf67ad.383hy58s8z2hqzhx.rcgu.o" "/Users/messense/Projects/cargo-lipo/testdata/workspace/target/debug/build/static2build-848f0bcf35cf67ad/build_script_build-848f0bcf35cf67ad.3lpshulrxroi2squ.rcgu.o" "/Users/messense/Projects/cargo-lipo/testdata/workspace/target/debug/build/static2build-848f0bcf35cf67ad/build_script_build-848f0bcf35cf67ad.4br683wddtvf1sui.rcgu.o" "/Users/messense/Projects/cargo-lipo/testdata/workspace/target/debug/build/static2build-848f0bcf35cf67ad/build_script_build-848f0bcf35cf67ad.5gcpa4kh5inmxxsj.rcgu.o" "/Users/messense/Projects/cargo-lipo/testdata/workspace/target/debug/build/static2build-848f0bcf35cf67ad/build_script_build-848f0bcf35cf67ad.vjdemme6opximb4.rcgu.o" "-o" "/Users/messense/Projects/cargo-lipo/testdata/workspace/target/debug/build/static2build-848f0bcf35cf67ad/build_script_build-848f0bcf35cf67ad" "/Users/messense/Projects/cargo-lipo/testdata/workspace/target/debug/build/static2build-848f0bcf35cf67ad/build_script_build-848f0bcf35cf67ad.3kd3pudkwwx93hwc.rcgu.o" "-Wl,-dead_strip" "-nodefaultlibs" "-L" "/Users/messense/Projects/cargo-lipo/testdata/workspace/target/debug/deps" "-L" "/Users/messense/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib" "/Users/messense/Projects/cargo-lipo/testdata/workspace/target/debug/deps/libbuildutil-02ae84b134c74c79.rlib" "/Users/messense/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/libstd-518979da66993550.rlib" "/Users/messense/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/libpanic_unwind-f52081aedccc205f.rlib" "/Users/messense/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/libobject-bad1c02788187328.rlib" "/Users/messense/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/libaddr2line-6375d8dbf53aee9d.rlib" "/Users/messense/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/libgimli-0ea8539778b0c0ab.rlib" "/Users/messense/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/librustc_demangle-64f30c6d69babb18.rlib" "/Users/messense/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/libhashbrown-e27428d997fd2532.rlib" "/Users/messense/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/librustc_std_workspace_alloc-f02467a76e5a8054.rlib" "/Users/messense/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/libunwind-9536efad7116d828.rlib" "/Users/messense/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/libcfg_if-5ca171f6ec11d7a5.rlib" "/Users/messense/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/liblibc-14b621861b38e51f.rlib" "/Users/messense/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/liballoc-38f4a0c206512fa5.rlib" "/Users/messense/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/librustc_std_workspace_core-99bca6ace58141c5.rlib" "/Users/messense/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/libcore-72a66f4c97a4c0c8.rlib" "/Users/messense/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/libcompiler_builtins-e7cd9f0beed2fc0f.rlib" "-lSystem" "-lresolv" "-lc" "-lm"
     = note: ld: library not found for -lSystem
             clang: error: linker command failed with exit code 1 (use -v to see invocation)


   error: aborting due to previous error

   error: could not compile `static2build`

   To learn more, run the command again with --verbose.
   [ERROR cargo_lipo] Failed to build "static2build" for "aarch64-apple-ios": Executing "/Users/messense/.rustup/toolchains/stable-x86_64-apple-darwin/bin/cargo" "--color" "auto" "build" "--manifest-path" "../workspace/Cargo.toml" "-p" "static2build" "--target" "aarch64-apple-ios" "--lib" finished with error status: exit code: 101

[messense]

Oh, it fails the with same error with master branch. #41

[messense]

With this PR I think we can allow it to run on non-macOS when xcode-integ is off.