Failed to cross-compile curl-rust example

Question

I built a Rust 1.2.0 cross compiler under Fedora (x86_64) which supported multiple targets including x86_64-pc-windows-gnu and arm-unknown-linux-gnueabihf and successfully compiled some simple programs.

However, I failed to cross compile the example program from curl-rust.

When building for x86_64-pc-windows-gnu, I got:

     Compiling curl_example v0.1.0 (file:///home/frederick/rust/curl_example)
     Running `rustc src/main.rs --crate-name curl_example --crate-type bin -C opt-level=3 --out-dir /home/frederick/rust/curl_example/target/x86_64-pc-windows-gnu/release --emit=dep-info,link --target x86_64-pc-windows-gnu -C ar=x86_64-w64-mingw32-ar -C linker=x86_64-w64-mingw32-gcc -L dependency=/home/frederick/rust/curl_example/target/x86_64-pc-windows-gnu/release -L dependency=/home/frederick/rust/curl_example/target/x86_64-pc-windows-gnu/release/deps --extern curl=/home/frederick/rust/curl_example/target/x86_64-pc-windows-gnu/release/deps/libcurl-8828a61714ae0eb4.rlib -L /home/frederick/rust/curl_example/target/x86_64-pc-windows-gnu/release/build/curl-sys-b582fd2220a1331e/out/lib`
error: linking with `x86_64-w64-mingw32-gcc` failed: exit code: 1
note: "x86_64-w64-mingw32-gcc" "-Wl,--enable-long-section-names" "-fno-use-linker-plugin" "-Wl,--nxcompat" "-static-libgcc" "-m64" "-L" "/usr/local/lib/rustlib/x86_64-pc-windows-gnu/lib" "/home/frederick/rust/curl_example/target/x86_64-pc-windows-gnu/release/curl_example.o" "-o" "/home/frederick/rust/curl_example/target/x86_64-pc-windows-gnu/release/curl_example.exe" "-Wl,--gc-sections" "/home/frederick/rust/curl_example/target/x86_64-pc-windows-gnu/release/deps/libcurl-8828a61714ae0eb4.rlib" "/home/frederick/rust/curl_example/target/x86_64-pc-windows-gnu/release/deps/libcurl_sys-b582fd2220a1331e.rlib" "/home/frederick/rust/curl_example/target/x86_64-pc-windows-gnu/release/deps/liburl-5247f81b4a7b5841.rlib" "/home/frederick/rust/curl_example/target/x86_64-pc-windows-gnu/release/deps/libmatches-68291f81832fc22d.rlib" "/home/frederick/rust/curl_example/target/x86_64-pc-windows-gnu/release/deps/liblog-8a6aba167994951e.rlib" "/home/frederick/rust/curl_example/target/x86_64-pc-windows-gnu/release/deps/liblibz_sys-e8e1552876cd3abe.rlib" "/home/frederick/rust/curl_example/target/x86_64-pc-windows-gnu/release/deps/liblibc-144c435538abd757.rlib" "/home/frederick/rust/curl_example/target/x86_64-pc-windows-gnu/release/deps/librustc_serialize-7ff5bfc027146194.rlib" "/usr/local/lib/rustlib/x86_64-pc-windows-gnu/lib/libstd-d8ace771.rlib" "/usr/local/lib/rustlib/x86_64-pc-windows-gnu/lib/libcollections-d8ace771.rlib" "/usr/local/lib/rustlib/x86_64-pc-windows-gnu/lib/librustc_unicode-d8ace771.rlib" "/usr/local/lib/rustlib/x86_64-pc-windows-gnu/lib/librand-d8ace771.rlib" "/usr/local/lib/rustlib/x86_64-pc-windows-gnu/lib/liballoc-d8ace771.rlib" "/usr/local/lib/rustlib/x86_64-pc-windows-gnu/lib/liblibc-d8ace771.rlib" "/usr/local/lib/rustlib/x86_64-pc-windows-gnu/lib/libcore-d8ace771.rlib" "-L" "/home/frederick/rust/curl_example/target/x86_64-pc-windows-gnu/release" "-L" "/home/frederick/rust/curl_example/target/x86_64-pc-windows-gnu/release/deps" "-L" "/home/frederick/rust/curl_example/target/x86_64-pc-windows-gnu/release/build/curl-sys-b582fd2220a1331e/out/lib" "-L" "/usr/local/lib/rustlib/x86_64-pc-windows-gnu/lib" "-L" "/home/frederick/rust/curl_example/.rust/lib/x86_64-pc-windows-gnu" "-L" "/home/frederick/rust/curl_example/lib/x86_64-pc-windows-gnu" "-Wl,-Bstatic" "-Wl,-Bdynamic" "-l" "ws2_32" "-l" "z" "-l" "ws2_32" "-l" "userenv" "-l" "advapi32" "-l" "compiler-rt"
note: /home/frederick/rust/curl_example/target/x86_64-pc-windows-gnu/release/deps/libcurl_sys-b582fd2220a1331e.rlib(r-curl-libcurl_la-version.o): could not read symbols: Invalid operation
collect2: error: ld returned 1 exit status

error: aborting due to previous error
Could not compile `curl_example`.

Caused by:
  Process didn't exit successfully: `rustc src/main.rs --crate-name curl_example --crate-type bin -C opt-level=3 --out-dir /home/frederick/rust/curl_example/target/x86_64-pc-windows-gnu/release --emit=dep-info,link --target x86_64-pc-windows-gnu -C ar=x86_64-w64-mingw32-ar -C linker=x86_64-w64-mingw32-gcc -L dependency=/home/frederick/rust/curl_example/target/x86_64-pc-windows-gnu/release -L dependency=/home/frederick/rust/curl_example/target/x86_64-pc-windows-gnu/release/deps --extern curl=/home/frederick/rust/curl_example/target/x86_64-pc-windows-gnu/release/deps/libcurl-8828a61714ae0eb4.rlib -L /home/frederick/rust/curl_example/target/x86_64-pc-windows-gnu/release/build/curl-sys-b582fd2220a1331e/out/lib` (exit code: 101)

When building for arm-unknown-linux-gnueabihf, I got:

   Compiling curl_example v0.1.0 (file:///home/frederick/rust/curl_example)
     Running `rustc src/main.rs --crate-name curl_example --crate-type bin -C opt-level=3 --out-dir /home/frederick/rust/curl_example/target/arm-unknown-linux-gnueabihf/release --emit=dep-info,link --target arm-unknown-linux-gnueabihf -C ar=arm-linux-gnueabihf-ar -C linker=arm-linux-gnueabihf-gcc -L dependency=/home/frederick/rust/curl_example/target/arm-unknown-linux-gnueabihf/release -L dependency=/home/frederick/rust/curl_example/target/arm-unknown-linux-gnueabihf/release/deps --extern curl=/home/frederick/rust/curl_example/target/arm-unknown-linux-gnueabihf/release/deps/libcurl-8828a61714ae0eb4.rlib -L /home/frederick/rust/curl_example/target/arm-unknown-linux-gnueabihf/release/build/curl-sys-b582fd2220a1331e/out/lib -L native=/home/frederick/rust/curl_example/target/arm-unknown-linux-gnueabihf/release/build/openssl-sys-765ddf9de3c5179c/out`
error: linking with `arm-linux-gnueabihf-gcc` failed: exit code: 1
note: "arm-linux-gnueabihf-gcc" "-Wl,--as-needed" "-L" "/usr/local/lib/rustlib/arm-unknown-linux-gnueabihf/lib" "/home/frederick/rust/curl_example/target/arm-unknown-linux-gnueabihf/release/curl_example.o" "-o" "/home/frederick/rust/curl_example/target/arm-unknown-linux-gnueabihf/release/curl_example" "-Wl,--whole-archive" "-l" "morestack" "-Wl,--no-whole-archive" "-Wl,--gc-sections" "-pie" "-Wl,-O1" "-nodefaultlibs" "/home/frederick/rust/curl_example/target/arm-unknown-linux-gnueabihf/release/deps/libcurl-8828a61714ae0eb4.rlib" "/home/frederick/rust/curl_example/target/arm-unknown-linux-gnueabihf/release/deps/libcurl_sys-b582fd2220a1331e.rlib" "/home/frederick/rust/curl_example/target/arm-unknown-linux-gnueabihf/release/deps/liburl-5247f81b4a7b5841.rlib" "/home/frederick/rust/curl_example/target/arm-unknown-linux-gnueabihf/release/deps/libmatches-68291f81832fc22d.rlib" "/home/frederick/rust/curl_example/target/arm-unknown-linux-gnueabihf/release/deps/liblog-8a6aba167994951e.rlib" "/home/frederick/rust/curl_example/target/arm-unknown-linux-gnueabihf/release/deps/liblibz_sys-e8e1552876cd3abe.rlib" "/home/frederick/rust/curl_example/target/arm-unknown-linux-gnueabihf/release/deps/librustc_serialize-7ff5bfc027146194.rlib" "/home/frederick/rust/curl_example/target/arm-unknown-linux-gnueabihf/release/deps/libopenssl_sys-765ddf9de3c5179c.rlib" "/home/frederick/rust/curl_example/target/arm-unknown-linux-gnueabihf/release/deps/liblibc-144c435538abd757.rlib" "/usr/local/lib/rustlib/arm-unknown-linux-gnueabihf/lib/libstd-d8ace771.rlib" "/usr/local/lib/rustlib/arm-unknown-linux-gnueabihf/lib/libcollections-d8ace771.rlib" "/usr/local/lib/rustlib/arm-unknown-linux-gnueabihf/lib/librustc_unicode-d8ace771.rlib" "/usr/local/lib/rustlib/arm-unknown-linux-gnueabihf/lib/librand-d8ace771.rlib" "/usr/local/lib/rustlib/arm-unknown-linux-gnueabihf/lib/liballoc-d8ace771.rlib" "/usr/local/lib/rustlib/arm-unknown-linux-gnueabihf/lib/liblibc-d8ace771.rlib" "/usr/local/lib/rustlib/arm-unknown-linux-gnueabihf/lib/libcore-d8ace771.rlib" "-L" "/home/frederick/rust/curl_example/target/arm-unknown-linux-gnueabihf/release" "-L" "/home/frederick/rust/curl_example/target/arm-unknown-linux-gnueabihf/release/deps" "-L" "/home/frederick/rust/curl_example/target/arm-unknown-linux-gnueabihf/release/build/curl-sys-b582fd2220a1331e/out/lib" "-L" "/home/frederick/rust/curl_example/target/arm-unknown-linux-gnueabihf/release/build/openssl-sys-765ddf9de3c5179c/out" "-L" "/usr/local/lib/rustlib/arm-unknown-linux-gnueabihf/lib" "-L" "/home/frederick/rust/curl_example/.rust/lib/arm-unknown-linux-gnueabihf" "-L" "/home/frederick/rust/curl_example/lib/arm-unknown-linux-gnueabihf" "-Wl,-Bstatic" "-Wl,-Bdynamic" "-l" "z" "-l" "crypto" "-l" "ssl" "-l" "c" "-l" "m" "-l" "dl" "-l" "pthread" "-l" "rt" "-l" "gcc_s" "-l" "pthread" "-l" "c" "-l" "m" "-l" "compiler-rt"
note: /home/frederick/rust/curl_example/target/arm-unknown-linux-gnueabihf/release/curl_example.o: In function `main::h3f0c65dd085aa280gaa':
curl_example.0.rs:(.text._ZN4main20h3f0c65dd085aa280gaaE+0x188): undefined reference to `curl_easy_setopt'
/home/frederick/rust/curl_example/target/arm-unknown-linux-gnueabihf/release/deps/libcurl-8828a61714ae0eb4.rlib(curl-8828a61714ae0eb4.o): In function `ffi::easy::global_init::cleanup::hfb9c781cea2b575dzia':
curl.0.rs:(.text._ZN3ffi4easy11global_init7cleanup20hfb9c781cea2b575dziaE+0x0): undefined reference to `curl_global_cleanup'
/home/frederick/rust/curl_example/target/arm-unknown-linux-gnueabihf/release/deps/libcurl-8828a61714ae0eb4.rlib(curl-8828a61714ae0eb4.o): In function `ffi::easy::Easy.Drop::drop::h0c646593d425c9d3Hia':
curl.0.rs:(.text._ZN3ffi4easy9Easy.Drop4drop20h0c646593d425c9d3HiaE+0x4): undefined reference to `curl_easy_cleanup'
/home/frederick/rust/curl_example/target/arm-unknown-linux-gnueabihf/release/deps/libcurl-8828a61714ae0eb4.rlib(curl-8828a61714ae0eb4.o): In function `ffi::err::ErrCode.fmt..Display::fmt::h032b81c4990a5e2fOra':
curl.0.rs:(.text._ZN3ffi3err20ErrCode.fmt..Display3fmt20h032b81c4990a5e2fOraE+0x48): undefined reference to `curl_easy_strerror'
/home/frederick/rust/curl_example/target/arm-unknown-linux-gnueabihf/release/deps/libcurl-8828a61714ae0eb4.rlib(curl-8828a61714ae0eb4.o): In function `http::handle::Handle::new::hcbd4647fea69f7fe3Va':
curl.0.rs:(.text._ZN4http6handle6Handle3new20hcbd4647fea69f7fe3VaE+0x220): undefined reference to `curl_easy_init'
curl.0.rs:(.text._ZN4http6handle6Handle3new20hcbd4647fea69f7fe3VaE+0x230): undefined reference to `curl_easy_setopt'
curl.0.rs:(.text._ZN4http6handle6Handle3new20hcbd4647fea69f7fe3VaE+0x244): undefined reference to `curl_easy_setopt'
curl.0.rs:(.text._ZN4http6handle6Handle3new20hcbd4647fea69f7fe3VaE+0x260): undefined reference to `curl_easy_setopt'
curl.0.rs:(.text._ZN4http6handle6Handle3new20hcbd4647fea69f7fe3VaE+0x49c): undefined reference to `curl_easy_cleanup'
curl.0.rs:(.text._ZN4http6handle6Handle3new20hcbd4647fea69f7fe3VaE+0x534): undefined reference to `curl_easy_cleanup'
curl.0.rs:(.text._ZN4http6handle6Handle3new20hcbd4647fea69f7fe3VaE+0x558): undefined reference to `curl_easy_cleanup'
curl.0.rs:(.text._ZN4http6handle6Handle3new20hcbd4647fea69f7fe3VaE+0x5dc): undefined reference to `curl_easy_cleanup'
/home/frederick/rust/curl_example/target/arm-unknown-linux-gnueabihf/release/deps/libcurl-8828a61714ae0eb4.rlib(curl-8828a61714ae0eb4.o): In function `ffi::easy::Easy::setopt::h17415893674049649907':
curl.0.rs:(.text._ZN3ffi4easy4Easy6setopt21h17415893674049649907E+0x1bc): undefined reference to `curl_easy_setopt'
/home/frederick/rust/curl_example/target/arm-unknown-linux-gnueabihf/release/deps/libcurl-8828a61714ae0eb4.rlib(curl-8828a61714ae0eb4.o): In function `http::handle::Request$LT$$u27$a$C$$u20$$u27$b$GT$::exec::hd3fad3894ea8584cgab':
curl.0.rs:(.text._ZN4http6handle35Request$LT$$u27$a$C$$u20$$u27$b$GT$4exec20hd3fad3894ea8584cgabE+0x108): undefined reference to `curl_easy_setopt'
curl.0.rs:(.text._ZN4http6handle35Request$LT$$u27$a$C$$u20$$u27$b$GT$4exec20hd3fad3894ea8584cgabE+0x14c): undefined reference to `curl_easy_setopt'
curl.0.rs:(.text._ZN4http6handle35Request$LT$$u27$a$C$$u20$$u27$b$GT$4exec20hd3fad3894ea8584cgabE+0x1a0): undefined reference to `curl_easy_setopt'
curl.0.rs:(.text._ZN4http6handle35Request$LT$$u27$a$C$$u20$$u27$b$GT$4exec20hd3fad3894ea8584cgabE+0x1b8): undefined reference to `curl_easy_setopt'
/home/frederick/rust/curl_example/target/arm-unknown-linux-gnueabihf/release/deps/libcurl-8828a61714ae0eb4.rlib(curl-8828a61714ae0eb4.o):curl.0.rs:(.text._ZN4http6handle35Request$LT$$u27$a$C$$u20$$u27$b$GT$4exec20hd3fad3894ea8584cgabE+0x1d0): more undefined references to `curl_easy_setopt' follow
/home/frederick/rust/curl_example/target/arm-unknown-linux-gnueabihf/release/deps/libcurl-8828a61714ae0eb4.rlib(curl-8828a61714ae0eb4.o): In function `http::handle::Request$LT$$u27$a$C$$u20$$u27$b$GT$::exec::hd3fad3894ea8584cgab':
curl.0.rs:(.text._ZN4http6handle35Request$LT$$u27$a$C$$u20$$u27$b$GT$4exec20hd3fad3894ea8584cgabE+0x8e4): undefined reference to `curl_slist_append'
curl.0.rs:(.text._ZN4http6handle35Request$LT$$u27$a$C$$u20$$u27$b$GT$4exec20hd3fad3894ea8584cgabE+0x94c): undefined reference to `curl_easy_setopt'
curl.0.rs:(.text._ZN4http6handle35Request$LT$$u27$a$C$$u20$$u27$b$GT$4exec20hd3fad3894ea8584cgabE+0x998): undefined reference to `curl_slist_free_all'
curl.0.rs:(.text._ZN4http6handle35Request$LT$$u27$a$C$$u20$$u27$b$GT$4exec20hd3fad3894ea8584cgabE+0xa30): undefined reference to `curl_easy_setopt'
curl.0.rs:(.text._ZN4http6handle35Request$LT$$u27$a$C$$u20$$u27$b$GT$4exec20hd3fad3894ea8584cgabE+0xa50): undefined reference to `curl_easy_setopt'
curl.0.rs:(.text._ZN4http6handle35Request$LT$$u27$a$C$$u20$$u27$b$GT$4exec20hd3fad3894ea8584cgabE+0xa70): undefined reference to `curl_easy_setopt'
curl.0.rs:(.text._ZN4http6handle35Request$LT$$u27$a$C$$u20$$u27$b$GT$4exec20hd3fad3894ea8584cgabE+0xa84): undefined reference to `curl_easy_setopt'
curl.0.rs:(.text._ZN4http6handle35Request$LT$$u27$a$C$$u20$$u27$b$GT$4exec20hd3fad3894ea8584cgabE+0xaa4): undefined reference to `curl_easy_setopt'
/home/frederick/rust/curl_example/target/arm-unknown-linux-gnueabihf/release/deps/libcurl-8828a61714ae0eb4.rlib(curl-8828a61714ae0eb4.o):curl.0.rs:(.text._ZN4http6handle35Request$LT$$u27$a$C$$u20$$u27$b$GT$4exec20hd3fad3894ea8584cgabE+0xabc): more undefined references to `curl_easy_setopt' follow
/home/frederick/rust/curl_example/target/arm-unknown-linux-gnueabihf/release/deps/libcurl-8828a61714ae0eb4.rlib(curl-8828a61714ae0eb4.o): In function `http::handle::Request$LT$$u27$a$C$$u20$$u27$b$GT$::exec::hd3fad3894ea8584cgab':
curl.0.rs:(.text._ZN4http6handle35Request$LT$$u27$a$C$$u20$$u27$b$GT$4exec20hd3fad3894ea8584cgabE+0xaf8): undefined reference to `curl_easy_perform'
curl.0.rs:(.text._ZN4http6handle35Request$LT$$u27$a$C$$u20$$u27$b$GT$4exec20hd3fad3894ea8584cgabE+0xb30): undefined reference to `curl_easy_getinfo'
curl.0.rs:(.text._ZN4http6handle35Request$LT$$u27$a$C$$u20$$u27$b$GT$4exec20hd3fad3894ea8584cgabE+0xc0c): undefined reference to `curl_slist_free_all'
curl.0.rs:(.text._ZN4http6handle35Request$LT$$u27$a$C$$u20$$u27$b$GT$4exec20hd3fad3894ea8584cgabE+0xe24): undefined reference to `curl_slist_free_all'
/home/frederick/rust/curl_example/target/arm-unknown-linux-gnueabihf/release/deps/libcurl-8828a61714ae0eb4.rlib(curl-8828a61714ae0eb4.o): In function `ffi::easy::Easy::setopt::h1335928551378549339':
curl.0.rs:(.text._ZN3ffi4easy4Easy6setopt20h1335928551378549339E+0x160): undefined reference to `curl_easy_setopt'
collect2: error: ld returned 1 exit status

error: aborting due to previous error
Could not compile `curl_example`.

Caused by:
  Process didn't exit successfully: `rustc src/main.rs --crate-name curl_example --crate-type bin -C opt-level=3 --out-dir /home/frederick/rust/curl_example/target/arm-unknown-linux-gnueabihf/release --emit=dep-info,link --target arm-unknown-linux-gnueabihf -C ar=arm-linux-gnueabihf-ar -C linker=arm-linux-gnueabihf-gcc -L dependency=/home/frederick/rust/curl_example/target/arm-unknown-linux-gnueabihf/release -L dependency=/home/frederick/rust/curl_example/target/arm-unknown-linux-gnueabihf/release/deps --extern curl=/home/frederick/rust/curl_example/target/arm-unknown-linux-gnueabihf/release/deps/libcurl-8828a61714ae0eb4.rlib -L /home/frederick/rust/curl_example/target/arm-unknown-linux-gnueabihf/release/build/curl-sys-b582fd2220a1331e/out/lib -L native=/home/frederick/rust/curl_example/target/arm-unknown-linux-gnueabihf/release/build/openssl-sys-765ddf9de3c5179c/out` (exit code: 101)

But I did successfully cross compile curl-rust itself for both x86_64-pc-windows-gnu and arm-unknown-linux-gnueabihf which made it weirder.

How to fix these problems? Did I miss any configurations?

Answer 1

The major cause of the problem was that the build script didn't pass host to the configuration command of curl. I've sent a PR to the author after a discussion. So wait for the update or just apply the patch locally.

But there's actually another problem which may fail the compilation during the final linking stage. The ssl should have been linked before crypto however the rust-openssl did it in a reversed sequence. The author of curl-rust has sent a PR to the rust-openssl project.