Improve cross compilation support for vendored sasl2 builds

[tillrohrmann]

This PR introduces autotools into the sasl2-sys/build.rs to automatically derive the correct toolchain based on HOST and TARGET from CC_<target triplet>, CXX_<target triplet>, AR_<target triplet>.

Additionally, it makes cross compilation possible by not running systest if we are cross compiling.

This fixes #54

[tillrohrmann]

@benesch or @pbor, I would be deeply thankful if you could help me reviewing and merging these changes since we would like to get rid of our rust-sasl fork. Thanks a lot!

[benesch]

Hi @tillrohrmann, thanks for the patch. A few notes though:

• The decision to not use the autotools crate was intentional. In my experience it causes as many problems as it solves. I would prefer to stick with the current approach of shelling out to configure and make directly.
• Can you share the exact error you were seeing without the patch? configure itself should handle reading the CC_<target_triple> env var, if I understand correctly.
• I don't believe the changes to systest should be necessary? When depending upon sasl2-sys as a library, systest should not be linked in or run.

[tillrohrmann]

Thanks a lot for getting back to me so quickly @benesch 🙏

Hi @tillrohrmann, thanks for the patch. A few notes though:

• The decision to not use the autotools crate was intentional. In my experience it causes as many problems as it solves. I would prefer to stick with the current approach of shelling out to configure and make directly.
• Can you share the exact error you were seeing without the patch? configure itself should handle reading the CC_<target_triple> env var, if I understand correctly.

The problem I am seeing when cross compiling from arm64 to amd64 is:

#15 85.56   = note:  "x86_64-linux-gnu-gcc" "-m64" "/tmp/rustcZVPtj5/symbols.o" "<257 object files omitted>" "-Wl,--as-needed" "-Wl,-Bstatic" 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"<sysroot>/lib/rustlib/x86_64-unknown-linux-gnu/lib/{libstd-*,libpanic_unwind-*,libobject-*,libmemchr-*,libaddr2line-*,libgimli-*,libcfg_if-*,librustc_demangle-*,libstd_detect-*,libhashbrown-*,librustc_std_workspace_alloc-*,libminiz_oxide-*,libadler2-*,libunwind-*,liblibc-*,librustc_std_workspace_core-*,liballoc-*,libcore-*,libcompiler_builtins-*}.rlib" "-Wl,-Bdynamic" "-lresolv" "-lstdc++" "-lgcc_s" "-lutil" "-lrt" "-lpthread" "-lm" "-ldl" "-lc" "-L" "/tmp/rustcZVPtj5/raw-dylibs" "-Wl,--eh-frame-hdr" "-Wl,-z,noexecstack" "-L" "/restate/target/x86_64-unknown-linux-gnu/debug/build/ring-7e0d3fd85f191756/out" "-L" "/restate/target/x86_64-unknown-linux-gnu/debug/build/aws-lc-sys-6ff5b8cc718d6448/out" "-L" "/restate/target/x86_64-unknown-linux-gnu/debug/build/bzip2-sys-8888db809ca5e8ac/out/lib" "-L" "/restate/target/x86_64-unknown-linux-gnu/debug/build/psm-f2a2094036321da4/out" "-L" "/restate/target/x86_64-unknown-linux-gnu/debug/build/libz-sys-a10e8c6f5a3b72f0/out/lib" "-L" "/restate/target/x86_64-unknown-linux-gnu/debug/build/rdkafka-sys-fc31e6b525acd2a8/out/lib" "-L" "/restate/target/x86_64-unknown-linux-gnu/debug/build/curl-sys-d194e995e24a05ac/out/build" "-L" "/restate/target/x86_64-unknown-linux-gnu/debug/build/openssl-sys-d9c053e4ce9cd626/out/openssl-build/install/lib" "-L" "/restate/target/x86_64-unknown-linux-gnu/debug/build/sasl2-sys-61c6e45d9c00cedc/out/install/lib" "-L" "/restate/target/x86_64-unknown-linux-gnu/debug/build/zstd-sys-fef4f739d659b81c/out" "-L" "/restate/target/x86_64-unknown-linux-gnu/debug/build/blake3-7312a4bf6b2ffb03/out" "-L" "/restate/target/x86_64-unknown-linux-gnu/debug/build/rust-librocksdb-sys-2050f32713e12f5e/out" "-L" "/restate/target/x86_64-unknown-linux-gnu/debug/build/lz4-sys-6d0534314fbc3abc/out" "-L" "/restate/target/x86_64-unknown-linux-gnu/debug/build/tikv-jemalloc-sys-b5e9bdd9333fb59a/out/build/lib" "-L" "/restate/target/x86_64-unknown-linux-gnu/debug/build/krb5-src-3abdbe8c56a99731/out/install/lib" "-L" "<sysroot>/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-o" "/restate/target/x86_64-unknown-linux-gnu/debug/deps/restate_server-96f065d5787eaf52" "-Wl,--gc-sections" "-pie" "-Wl,-z,relro,-z,now" "-nodefaultlibs"
#15 85.56   = note: some arguments are omitted. use `--verbose` to show all linker arguments
#15 85.56   = note: /usr/lib/gcc-cross/x86_64-linux-gnu/14/../../../../x86_64-linux-gnu/bin/ld: /restate/target/x86_64-unknown-linux-gnu/debug/deps/libsasl2_sys-4da3fa16190c7a52.rlib(client.o): Relocations in generic ELF (EM: 183)
#15 85.56           /usr/lib/gcc-cross/x86_64-linux-gnu/14/../../../../x86_64-linux-gnu/bin/ld: /restate/target/x86_64-unknown-linux-gnu/debug/deps/libsasl2_sys-4da3fa16190c7a52.rlib(client.o): Relocations in generic ELF (EM: 183)
#15 85.56           /usr/lib/gcc-cross/x86_64-linux-gnu/14/../../../../x86_64-linux-gnu/bin/ld: /restate/target/x86_64-unknown-linux-gnu/debug/deps/libsasl2_sys-4da3fa16190c7a52.rlib(client.o): Relocations in generic ELF (EM: 183)
#15 85.56           /usr/lib/gcc-cross/x86_64-linux-gnu/14/../../../../x86_64-linux-gnu/bin/ld: /restate/target/x86_64-unknown-linux-gnu/debug/deps/libsasl2_sys-4da3fa16190c7a52.rlib: error adding symbols: file in wrong format
#15 85.56           collect2: error: ld returned 1 exit status

This looks as if the libsasl2_sys artifacts are built with the wrong architecture.

Note that I am running in an environment with

ENV CC_x86_64_unknown_linux_gnu="sccache x86_64-linux-gnu-gcc"
ENV CXX_x86_64_unknown_linux_gnu="sccache x86_64-linux-gnu-g++"
ENV AR_x86_64_unknown_linux_gnu="x86_64-linux-gnu-ar"
ENV CARGO_TARGET_X86_64_UNKNOWN_LINUX_GNU_LINKER="x86_64-linux-gnu-gcc"
ENV BINDGEN_EXTRA_CLANG_ARGS_x86_64_unknown_linux_gnu="--sysroot=/usr/x86_64-linux-gnu"

With the autotools fix, this problem is gone. I also noticed that you are deriving the CC, AR in the rust-krb5-src repo from CC_<target triplet> and AR_<target triplet> explicitly (https://github.com/MaterializeInc/rust-krb5-src/blob/master/build.rs#L54) which is not happening in this repo. I guess this could also work as a fix if you are trying to avoid introducing autotools.

• I don't believe the changes to systest should be necessary? When depending upon sasl2-sys as a library, systest should not be linked in or run.

You are right that systest is not needed when only depending on sasl2-sys. I was cross compiling the whole rust-sasl project when running into it. Will remove this part from the PR.

[tillrohrmann]

I've pushed an additional commit which disables tests when cross compiling to improve the user experience.