Unable to build openssl 0.7.x for ARM

[operutka]

I've been trying to build the new 0.7.x release for ARM using rust 1.4.0 cross-compiler; unfortunately I always get the following errors:

...
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.0/src/bn/mod.rs:92:50: 92:64 error: mismatched types:
 expected `*const u8`,
    found `*const i8`
(expected u8,
    found i8) [E0308]
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.0/src/bn/mod.rs:92             try_ssl!(ffi::BN_dec2bn(v.raw_ptr(), c_str.as_ptr()));
                                                                                                                                              ^~~~~~~~~~~~~~
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.0/src/macros.rs:24:19: 24:39 note: in this expansion of try_ssl_if! (defined in /home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.0/src/macros.rs)
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.0/src/bn/mod.rs:92:13: 92:67 note: in this expansion of try_ssl! (defined in /home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.0/src/macros.rs)
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.0/src/bn/mod.rs:92:50: 92:64 help: run `rustc --explain E0308` to see a detailed explanation
...

Note that this is only an example. There is a lot of errors like this but it's always type mismatch between *const u8 and *const i8. Building it directly for x86/x86_64 works fine as well as building the 0.6.x release for ARM, x86 and x86_64. I use the same version of Rust on all mentioned architectures (it is 1.4.0 8ab8581f6 2015-10-27).

My guess is that CStr and CString use different mapping for c_char on ARM but I don't know why there is no problem with the 0.6.x release.

[sfackler]

We upgraded libc versions from 0.6 to 0.7 that fixed the definition of c_char on ARM. Should be an easy fix to add a cast there.

[operutka]

Great! As I mentioned before, this is not the only problematic spot. Here is the complete error output:

/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/bn/mod.rs:92:50: 92:64 error: mismatched types:
 expected `*const u8`,
    found `*const i8`
(expected u8,
    found i8) [E0308]
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/bn/mod.rs:92             try_ssl!(ffi::BN_dec2bn(v.raw_ptr(), c_str.as_ptr()));
                                                                                                                                              ^~~~~~~~~~~~~~
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/macros.rs:24:19: 24:39 note: in this expansion of try_ssl_if! (defined in /home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/macros.rs)
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/bn/mod.rs:92:13: 92:67 note: in this expansion of try_ssl! (defined in /home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/macros.rs)
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/bn/mod.rs:92:50: 92:64 help: run `rustc --explain E0308` to see a detailed explanation
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/bn/mod.rs:100:50: 100:64 error: mismatched types:
 expected `*const u8`,
    found `*const i8`
(expected u8,
    found i8) [E0308]
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/bn/mod.rs:100             try_ssl!(ffi::BN_hex2bn(v.raw_ptr(), c_str.as_ptr()));
                                                                                                                                               ^~~~~~~~~~~~~~
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/macros.rs:24:19: 24:39 note: in this expansion of try_ssl_if! (defined in /home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/macros.rs)
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/bn/mod.rs:100:13: 100:67 note: in this expansion of try_ssl! (defined in /home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/macros.rs)
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/bn/mod.rs:100:50: 100:64 help: run `rustc --explain E0308` to see a detailed explanation
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/bn/mod.rs:424:56: 424:59 error: mismatched types:
 expected `*const i8`,
    found `*const u8`
(expected i8,
    found u8) [E0308]
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/bn/mod.rs:424             let str = String::from_utf8(CStr::from_ptr(buf).to_bytes().to_vec()).unwrap();
                                                                                                                                                     ^~~
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/bn/mod.rs:424:56: 424:59 help: run `rustc --explain E0308` to see a detailed explanation
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/bn/mod.rs:434:56: 434:59 error: mismatched types:
 expected `*const i8`,
    found `*const u8`
(expected i8,
    found u8) [E0308]
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/bn/mod.rs:434             let str = String::from_utf8(CStr::from_ptr(buf).to_bytes().to_vec()).unwrap();
                                                                                                                                                     ^~~
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/bn/mod.rs:434:56: 434:59 help: run `rustc --explain E0308` to see a detailed explanation
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/ssl/error.rs:120:36: 120:66 error: mismatched types:
 expected `*const i8`,
    found `*const u8`
(expected i8,
    found u8) [E0308]
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/ssl/error.rs:120         let bytes = CStr::from_ptr(ffi::ERR_lib_error_string(err)).to_bytes().to_vec();
                                                                                                                                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/ssl/error.rs:120:36: 120:66 help: run `rustc --explain E0308` to see a detailed explanation
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/ssl/error.rs:127:36: 127:67 error: mismatched types:
 expected `*const i8`,
    found `*const u8`
(expected i8,
    found u8) [E0308]
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/ssl/error.rs:127         let bytes = CStr::from_ptr(ffi::ERR_func_error_string(err)).to_bytes().to_vec();
                                                                                                                                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/ssl/error.rs:127:36: 127:67 help: run `rustc --explain E0308` to see a detailed explanation
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/ssl/error.rs:134:36: 134:69 error: mismatched types:
 expected `*const i8`,
    found `*const u8`
(expected i8,
    found u8) [E0308]
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/ssl/error.rs:134         let bytes = CStr::from_ptr(ffi::ERR_reason_error_string(err)).to_bytes().to_vec();
                                                                                                                                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/ssl/error.rs:134:36: 134:69 help: run `rustc --explain E0308` to see a detailed explanation
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/ssl/mod.rs:513:62: 513:75 error: mismatched types:
 expected `*const u8`,
    found `*const i8`
(expected u8,
    found i8) [E0308]
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/ssl/mod.rs:513                 ffi::SSL_CTX_load_verify_locations(self.ctx, file.as_ptr(), ptr::null())
                                                                                                                                                            ^~~~~~~~~~~~~
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/ssl/mod.rs:513:62: 513:75 help: run `rustc --explain E0308` to see a detailed explanation
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/ssl/mod.rs:523:61: 523:74 error: mismatched types:
 expected `*const u8`,
    found `*const i8`
(expected u8,
    found i8) [E0308]
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/ssl/mod.rs:523                 ffi::SSL_CTX_use_certificate_file(self.ctx, file.as_ptr(), file_type as c_int)
                                                                                                                                                           ^~~~~~~~~~~~~
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/ssl/mod.rs:523:61: 523:74 help: run `rustc --explain E0308` to see a detailed explanation
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/ssl/mod.rs:533:67: 533:80 error: mismatched types:
 expected `*const u8`,
    found `*const i8`
(expected u8,
    found i8) [E0308]
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/ssl/mod.rs:533                 ffi::SSL_CTX_use_certificate_chain_file(self.ctx, file.as_ptr(), file_type as c_int)
                                                                                                                                                                 ^~~~~~~~~~~~~
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/ssl/mod.rs:533:67: 533:80 help: run `rustc --explain E0308` to see a detailed explanation
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/ssl/mod.rs:560:60: 560:73 error: mismatched types:
 expected `*const u8`,
    found `*const i8`
(expected u8,
    found i8) [E0308]
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/ssl/mod.rs:560                 ffi::SSL_CTX_use_PrivateKey_file(self.ctx, file.as_ptr(), file_type as c_int)
                                                                                                                                                          ^~~~~~~~~~~~~
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/ssl/mod.rs:560:60: 560:73 help: run `rustc --explain E0308` to see a detailed explanation
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/ssl/mod.rs:584:56: 584:76 error: mismatched types:
 expected `*const u8`,
    found `*const i8`
(expected u8,
    found i8) [E0308]
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/ssl/mod.rs:584                 ffi::SSL_CTX_set_cipher_list(self.ctx, cipher_list.as_ptr())
                                                                                                                                                      ^~~~~~~~~~~~~~~~~~~~
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/ssl/mod.rs:584:56: 584:76 help: run `rustc --explain E0308` to see a detailed explanation
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/ssl/mod.rs:771:28: 771:31 error: mismatched types:
 expected `*const i8`,
    found `*const u8`
(expected i8,
    found u8) [E0308]
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/ssl/mod.rs:771             CStr::from_ptr(ptr)
                                                                                                                          ^~~
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/ssl/mod.rs:771:28: 771:31 help: run `rustc --explain E0308` to see a detailed explanation
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/ssl/mod.rs:780:28: 780:31 error: mismatched types:
 expected `*const i8`,
    found `*const u8`
(expected i8,
    found u8) [E0308]
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/ssl/mod.rs:780             CStr::from_ptr(ptr)
                                                                                                                          ^~~
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/ssl/mod.rs:780:28: 780:31 help: run `rustc --explain E0308` to see a detailed explanation
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/ssl/mod.rs:789:75: 789:88 error: mismatched types:
 expected `*const u8`,
    found `*const i8`
(expected u8,
    found i8) [E0308]
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/ssl/mod.rs:789         let ret = unsafe { ffi_extras::SSL_set_tlsext_host_name(self.ssl, cstr.as_ptr()) };
                                                                                                                                                                         ^~~~~~~~~~~~~
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/ssl/mod.rs:789:75: 789:88 help: run `rustc --explain E0308` to see a detailed explanation
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/ssl/mod.rs:877:46: 877:50 error: mismatched types:
 expected `*const i8`,
    found `*const u8`
(expected i8,
    found u8) [E0308]
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/ssl/mod.rs:877             String::from_utf8(CStr::from_ptr(meth).to_bytes().to_vec()).unwrap()
                                                                                                                                            ^~~~
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/ssl/mod.rs:877:46: 877:50 help: run `rustc --explain E0308` to see a detailed explanation
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/x509/mod.rs:53:46: 53:49 error: mismatched types:
 expected `*const i8`,
    found `*const u8`
(expected i8,
    found u8) [E0308]
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/x509/mod.rs:53             s: str::from_utf8(CStr::from_ptr(buf).to_bytes()).unwrap()
                                                                                                                                            ^~~
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/x509/mod.rs:53:46: 53:49 help: run `rustc --explain E0308` to see a detailed explanation
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/x509/mod.rs:278:51: 278:63 error: mismatched types:
 expected `*const u8`,
    found `*const i8`
(expected u8,
    found i8) [E0308]
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/x509/mod.rs:278             ffi::X509_NAME_add_entry_by_txt(name, key.as_ptr(), ffi::MBSTRING_UTF8,
                                                                                                                                                  ^~~~~~~~~~~~
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/macros.rs:58:19: 58:40 note: in this expansion of lift_ssl_if! (defined in /home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/macros.rs)
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/x509/mod.rs:275:9: 280:11 note: in this expansion of lift_ssl! (defined in /home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/macros.rs)
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/x509/mod.rs:278:51: 278:63 help: run `rustc --explain E0308` to see a detailed explanation
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/x509/mod.rs:279:45: 279:59 error: mismatched types:
 expected `*const u8`,
    found `*const i8`
(expected u8,
    found i8) [E0308]
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/x509/mod.rs:279                                             value.as_ptr(), value_len, -1, 0)
                                                                                                                                            ^~~~~~~~~~~~~~
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/macros.rs:58:19: 58:40 note: in this expansion of lift_ssl_if! (defined in /home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/macros.rs)
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/x509/mod.rs:275:9: 280:11 note: in this expansion of lift_ssl! (defined in /home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/macros.rs)
/home/xxx/.cargo/registry/src/github.com-0a35038f75765ae4/openssl-0.7.1/src/x509/mod.rs:279:45: 279:59 help: run `rustc --explain E0308` to see a detailed explanation
error: aborting due to 19 previous errors
Could not compile `openssl`.

To learn more, run the command again with --verbose.

[sfackler]

Would you have the time to make a PR? It should be as simple as adding as *const _ in the places that complain.

If not, I can get an ARM cross compilation toolchain setup and get it fixed.

[operutka]

no problem, I can do it

[operutka]

I've just sent you a pull request

[MagaTailor]

rust-lang/rust#29867

[MagaTailor]

I've just bumped into this issue (rust 1.5.0) and it seems the latest available crate is still @ 0.7.1