Link error when cross-compiling to ARM

[mbrubeck]

cargo build -v --target arm-linux-androideabi fails with:

error: linking with `cc` failed: exit code: 1
note: "cc" "-Wl,--as-needed" "-Wl,--allow-multiple-definition" "-L" "/home/mbrubeck/.servo/rust/168a23ebe1729386138fa71643382fdd64fac205/rustc-1.5.0-dev-x86_64-unknown-linux-gnu/rustc/lib/rustlib/arm-linux-androideabi/lib" "/home/mbrubeck/src/servo/target/arm-linux-androideabi/debug/gif.0.o" "-o" "/home/mbrubeck/src/servo/target/arm-linux-androideabi/debug/libgif.so" "/home/mbrubeck/src/servo/target/arm-linux-androideabi/debug/gif.metadata.o" "-nodefaultlibs" "-L" "/home/mbrubeck/src/servo/target/arm-linux-androideabi/debug" "-L" "/home/mbrubeck/src/servo/target/arm-linux-androideabi/debug/deps" "-L" "/home/mbrubeck/.servo/rust/168a23ebe1729386138fa71643382fdd64fac205/rustc-1.5.0-dev-x86_64-unknown-linux-gnu/rustc/lib/rustlib/arm-linux-androideabi/lib" "-L" "/home/mbrubeck/src/image-gif/.rust/lib/arm-linux-androideabi" "-L" "/home/mbrubeck/src/image-gif/lib/arm-linux-androideabi" "-Wl,-Bstatic" "-Wl,-Bdynamic" "-Wl,--whole-archive" "/tmp/rustc.sTmR4LtDco6E/libcolor_quant-6695fde28ee2e395.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustc.sTmR4LtDco6E/liblzw-f4c4a3ecf5835e0f.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustc.sTmR4LtDco6E/libstd-bb943c5a.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustc.sTmR4LtDco6E/libcollections-bb943c5a.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustc.sTmR4LtDco6E/librustc_unicode-bb943c5a.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustc.sTmR4LtDco6E/librand-bb943c5a.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustc.sTmR4LtDco6E/liballoc-bb943c5a.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustc.sTmR4LtDco6E/liballoc_system-bb943c5a.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustc.sTmR4LtDco6E/liblibc-bb943c5a.rlib" "-Wl,--no-whole-archive" "-Wl,--whole-archive" "/tmp/rustc.sTmR4LtDco6E/libcore-bb943c5a.rlib" "-Wl,--no-whole-archive" "-l" "dl" "-l" "log" "-l" "gcc" "-l" "gcc" "-l" "c" "-l" "m" "-shared" "-l" "compiler-rt"
note: /usr/bin/ld: /home/mbrubeck/src/servo/target/arm-linux-androideabi/debug/gif.0.o: Relocations in generic ELF (EM: 40)
/usr/bin/ld: /home/mbrubeck/src/servo/target/arm-linux-androideabi/debug/gif.0.o: Relocations in generic ELF (EM: 40)
...
/home/mbrubeck/src/servo/target/arm-linux-androideabi/debug/gif.0.o: error adding symbols: File in wrong format
collect2: error: ld returned 1 exit status

[mbrubeck]

Changing crate-type in Cargo.toml from ["dylib", "rlib"] to just ["rlib"] makes this error go away. This is probably a bug in rustc...

[mbrubeck]

Yes, this happens even when building an empty source file with --crate-type dylib --target arm-linux-androideabi. Filed as rust-lang/rust#28924.