Errors when targeting webassembly

[mihai-dinculescu]

I get the following errors when targeting wasm32-unknown-unknown.

Am I doing something wrong or is wasm not supported, yet?

$ cargo build --lib --target wasm32-unknown-unknown
   Compiling secp256k1-sys v0.4.0
   Compiling js-sys v0.3.47
   Compiling exonum_libsodium-sys v0.0.23
error[E0432]: unresolved imports `libc::c_char`, `libc::c_int`, `libc::c_ulonglong`, `libc::c_void`, `libc::size_t` --> C:\Users\mihai\.cargo\registry\src\github.com-1ecc6299db9ec823\exonum_libsodium-sys-0.0.23\lib.rs:3:12        
  |
3 | use libc::{c_char, c_int, c_ulonglong, c_void, size_t};
  |            ^^^^^^  ^^^^^  ^^^^^^^^^^^  ^^^^^^  ^^^^^^ no `size_t` in the root
  |            |       |      |            |
  |            |       |      |            no `c_void` in the root
  |            |       |      no `c_ulonglong` in the root
  |            |       no `c_int` in the root
  |            no `c_char` in the root

error[E0412]: cannot find type `c_uchar` in crate `libc`
 --> C:\Users\mihai\.cargo\registry\src\github.com-1ecc6299db9ec823\exonum_libsodium-sys-0.0.23\src/crypto_kx.rs:8:44
  |
8 |     pub fn crypto_kdf_keygen(k: *mut libc::c_uchar);
  |                                            ^^^^^^^ not found in `libc`
  |
help: consider importing this type alias
  |
3 | use std::os::raw::c_uchar;
  |

error[E0412]: cannot find type `c_char` in crate `libc`
  --> C:\Users\mihai\.cargo\registry\src\github.com-1ecc6299db9ec823\exonum_libsodium-sys-0.0.23\src/crypto_kx.rs:23:50
   |
23 |     pub fn crypto_kx_primitive() -> *const libc::c_char;
   |                                                  ^^^^^^ not found in `libc`
   |
help: consider importing this type alias
   |
3  | use std::os::raw::c_char;
   |

error[E0412]: cannot find type `c_uchar` in crate `libc`
  --> C:\Users\mihai\.cargo\registry\src\github.com-1ecc6299db9ec823\exonum_libsodium-sys-0.0.23\src/crypto_kx.rs:27:24
   |
27 |         pk: *mut libc::c_uchar,
   |                        ^^^^^^^ not found in `libc`
   |
help: consider importing this type alias
   |
3  | use std::os::raw::c_uchar;
   |

error[E0412]: cannot find type `c_uchar` in crate `libc`
  --> C:\Users\mihai\.cargo\registry\src\github.com-1ecc6299db9ec823\exonum_libsodium-sys-0.0.23\src/crypto_kx.rs:28:24
   |
28 |         sk: *mut libc::c_uchar,
   |                        ^^^^^^^ not found in `libc`
   |
help: consider importing this type alias
   |
3  | use std::os::raw::c_uchar;
   |

error[E0412]: cannot find type `c_uchar` in crate `libc`
  --> C:\Users\mihai\.cargo\registry\src\github.com-1ecc6299db9ec823\exonum_libsodium-sys-0.0.23\src/crypto_kx.rs:29:28
   |
29 |         seed: *const libc::c_uchar,
   |                            ^^^^^^^ not found in `libc`
   |
help: consider importing this type alias
   |
3  | use std::os::raw::c_uchar;
   |

error[E0412]: cannot find type `c_int` in crate `libc`
  --> C:\Users\mihai\.cargo\registry\src\github.com-1ecc6299db9ec823\exonum_libsodium-sys-0.0.23\src/crypto_kx.rs:30:16
   |
30 |     ) -> libc::c_int;
   |                ^^^^^ not found in `libc`
   |
help: consider importing this type alias
   |
3  | use std::os::raw::c_int;
   |

error[E0412]: cannot find type `c_uchar` in crate `libc`
  --> C:\Users\mihai\.cargo\registry\src\github.com-1ecc6299db9ec823\exonum_libsodium-sys-0.0.23\src/crypto_kx.rs:33:45
   |
33 |     pub fn crypto_kx_keypair(pk: *mut libc::c_uchar, sk: *mut libc::c_uchar) -> libc::c_int;
   |                                             ^^^^^^^ not found in `libc`
   |
help: consider importing this type alias
   |
3  | use std::os::raw::c_uchar;
   |

error[E0412]: cannot find type `c_uchar` in crate `libc`
  --> C:\Users\mihai\.cargo\registry\src\github.com-1ecc6299db9ec823\exonum_libsodium-sys-0.0.23\src/crypto_kx.rs:33:69
   |
33 |     pub fn crypto_kx_keypair(pk: *mut libc::c_uchar, sk: *mut libc::c_uchar) -> libc::c_int;
   |                                                                     ^^^^^^^ not found in `libc`
   |
help: consider importing this type alias
   |
3  | use std::os::raw::c_uchar;
   |

error[E0412]: cannot find type `c_int` in crate `libc`
  --> C:\Users\mihai\.cargo\registry\src\github.com-1ecc6299db9ec823\exonum_libsodium-sys-0.0.23\src/crypto_kx.rs:33:87
   |
33 |     pub fn crypto_kx_keypair(pk: *mut libc::c_uchar, sk: *mut libc::c_uchar) -> libc::c_int;
   |                                                                                       ^^^^^ not found in `libc`
   |
help: consider importing this type alias
   |
3  | use std::os::raw::c_int;
   |

error[E0412]: cannot find type `c_uchar` in crate `libc`
  --> C:\Users\mihai\.cargo\registry\src\github.com-1ecc6299db9ec823\exonum_libsodium-sys-0.0.23\src/crypto_kx.rs:37:24
   |
37 |         rx: *mut libc::c_uchar,
   |                        ^^^^^^^ not found in `libc`
   |
help: consider importing this type alias
   |
3  | use std::os::raw::c_uchar;
   |

error[E0412]: cannot find type `c_uchar` in crate `libc`
  --> C:\Users\mihai\.cargo\registry\src\github.com-1ecc6299db9ec823\exonum_libsodium-sys-0.0.23\src/crypto_kx.rs:38:24
   |
38 |         tx: *mut libc::c_uchar,
   |                        ^^^^^^^ not found in `libc`
   |
help: consider importing this type alias
   |
3  | use std::os::raw::c_uchar;
   |

error[E0412]: cannot find type `c_uchar` in crate `libc`
  --> C:\Users\mihai\.cargo\registry\src\github.com-1ecc6299db9ec823\exonum_libsodium-sys-0.0.23\src/crypto_kx.rs:39:33
   |
39 |         client_pk: *const libc::c_uchar,
   |                                 ^^^^^^^ not found in `libc`
   |
help: consider importing this type alias
   |
3  | use std::os::raw::c_uchar;
   |

error[E0412]: cannot find type `c_uchar` in crate `libc`
  --> C:\Users\mihai\.cargo\registry\src\github.com-1ecc6299db9ec823\exonum_libsodium-sys-0.0.23\src/crypto_kx.rs:40:33
   |
40 |         client_sk: *const libc::c_uchar,
   |                                 ^^^^^^^ not found in `libc`
   |
help: consider importing this type alias
   |
3  | use std::os::raw::c_uchar;
   |

error[E0412]: cannot find type `c_uchar` in crate `libc`
  --> C:\Users\mihai\.cargo\registry\src\github.com-1ecc6299db9ec823\exonum_libsodium-sys-0.0.23\src/crypto_kx.rs:41:33
   |
41 |         server_pk: *const libc::c_uchar,
   |                                 ^^^^^^^ not found in `libc`
   |
help: consider importing this type alias
   |
3  | use std::os::raw::c_uchar;
   |

error[E0412]: cannot find type `c_int` in crate `libc`
  --> C:\Users\mihai\.cargo\registry\src\github.com-1ecc6299db9ec823\exonum_libsodium-sys-0.0.23\src/crypto_kx.rs:42:16
   |
42 |     ) -> libc::c_int;
   |                ^^^^^ not found in `libc`
   |
help: consider importing this type alias
   |
3  | use std::os::raw::c_int;
   |

error[E0412]: cannot find type `c_uchar` in crate `libc`
  --> C:\Users\mihai\.cargo\registry\src\github.com-1ecc6299db9ec823\exonum_libsodium-sys-0.0.23\src/crypto_kx.rs:46:24
   |
46 |         rx: *mut libc::c_uchar,
   |                        ^^^^^^^ not found in `libc`
   |
help: consider importing this type alias
   |
3  | use std::os::raw::c_uchar;
   |

error[E0412]: cannot find type `c_uchar` in crate `libc`
  --> C:\Users\mihai\.cargo\registry\src\github.com-1ecc6299db9ec823\exonum_libsodium-sys-0.0.23\src/crypto_kx.rs:47:24
   |
47 |         tx: *mut libc::c_uchar,
   |                        ^^^^^^^ not found in `libc`
   |
help: consider importing this type alias
   |
3  | use std::os::raw::c_uchar;
   |

error[E0412]: cannot find type `c_uchar` in crate `libc`
  --> C:\Users\mihai\.cargo\registry\src\github.com-1ecc6299db9ec823\exonum_libsodium-sys-0.0.23\src/crypto_kx.rs:48:33
   |
48 |         server_pk: *const libc::c_uchar,
   |                                 ^^^^^^^ not found in `libc`
   |
help: consider importing this type alias
   |
3  | use std::os::raw::c_uchar;
   |

error[E0412]: cannot find type `c_uchar` in crate `libc`
  --> C:\Users\mihai\.cargo\registry\src\github.com-1ecc6299db9ec823\exonum_libsodium-sys-0.0.23\src/crypto_kx.rs:49:33
   |
49 |         server_sk: *const libc::c_uchar,
   |                                 ^^^^^^^ not found in `libc`
   |
help: consider importing this type alias
   |
3  | use std::os::raw::c_uchar;
   |

error[E0412]: cannot find type `c_uchar` in crate `libc`
  --> C:\Users\mihai\.cargo\registry\src\github.com-1ecc6299db9ec823\exonum_libsodium-sys-0.0.23\src/crypto_kx.rs:50:33
   |
50 |         client_pk: *const libc::c_uchar,
   |                                 ^^^^^^^ not found in `libc`
   |
help: consider importing this type alias
   |
3  | use std::os::raw::c_uchar;
   |

error[E0412]: cannot find type `c_int` in crate `libc`
  --> C:\Users\mihai\.cargo\registry\src\github.com-1ecc6299db9ec823\exonum_libsodium-sys-0.0.23\src/crypto_kx.rs:51:16
   |
51 |     ) -> libc::c_int;
   |                ^^^^^ not found in `libc`
   |
help: consider importing this type alias
   |
3  | use std::os::raw::c_int;
   |

error: aborting due to 22 previous errors

Some errors have detailed explanations: E0412, E0432.
For more information about an error, try `rustc --explain E0412`.
error: could not compile `exonum_libsodium-sys`

To learn more, run the command again with --verbose.
warning: build failed, waiting for other jobs to finish...
The following warnings were emitted during compilation:

warning: In file included from depend/secp256k1/src/secp256k1.c:10:
warning: In file included from depend/secp256k1/src/assumptions.h:12:
warning: In file included from depend/secp256k1/src/util.h:16:
warning: wasm-sysroot\stdio.h:4:28: warning: 'extern' variable has an initializer [-Wextern-initializer]
warning: extern const unsigned char WASM32_INT_SIZE = sizeof(int);
warning:                            ^
warning: wasm-sysroot\stdio.h:5:28: warning: 'extern' variable has an initializer [-Wextern-initializer]
warning: extern const unsigned char WASM32_INT_ALIGN = alignof(int);
warning:                            ^
warning: wasm-sysroot\stdio.h:7:28: warning: 'extern' variable has an initializer [-Wextern-initializer]
warning: extern const unsigned char WASM32_UNSIGNED_INT_SIZE = sizeof(unsigned int);
warning:                            ^
warning: wasm-sysroot\stdio.h:8:28: warning: 'extern' variable has an initializer [-Wextern-initializer]
warning: extern const unsigned char WASM32_UNSIGNED_INT_ALIGN = alignof(unsigned int);
warning:                            ^
warning: wasm-sysroot\stdio.h:10:28: warning: 'extern' variable has an initializer [-Wextern-initializer]
warning: extern const unsigned char WASM32_SIZE_T_SIZE = sizeof(size_t);
warning:                            ^
warning: wasm-sysroot\stdio.h:11:28: warning: 'extern' variable has an initializer [-Wextern-initializer]
warning: extern const unsigned char WASM32_SIZE_T_ALIGN = alignof(size_t);
warning:                            ^
warning: wasm-sysroot\stdio.h:13:28: warning: 'extern' variable has an initializer [-Wextern-initializer]
warning: extern const unsigned char WASM32_UNSIGNED_CHAR_SIZE = sizeof(unsigned char);
warning:                            ^
warning: wasm-sysroot\stdio.h:14:28: warning: 'extern' variable has an initializer [-Wextern-initializer]
warning: extern const unsigned char WASM32_UNSIGNED_CHAR_ALIGN = alignof(unsigned char);
warning:                            ^
warning: wasm-sysroot\stdio.h:16:28: warning: 'extern' variable has an initializer [-Wextern-initializer]
warning: extern const unsigned char WASM32_PTR_SIZE = sizeof(void*);
warning:                            ^
warning: wasm-sysroot\stdio.h:17:28: warning: 'extern' variable has an initializer [-Wextern-initializer]
warning: extern const unsigned char WASM32_PTR_ALIGN = alignof(void*);
warning:                            ^
warning: In file included from depend/secp256k1/src/secp256k1.c:13:
warning: depend/secp256k1/src/field_impl.h:266:13: warning: unused function 'rustsecp256k1_v0_4_0_fe_inv_all_var' [-Wunused-function]
warning: static void rustsecp256k1_v0_4_0_fe_inv_all_var(rustsecp256k1_v0_4_0_fe *r, const rustsecp256k1_v0_4_0_fe 
*a, size_t len) {
warning:             ^
warning: In file included from depend/secp256k1/src/secp256k1.c:15:
warning: depend/secp256k1/src/group_impl.h:191:13: warning: unused function 'rustsecp256k1_v0_4_0_ge_set_infinity' 
[-Wunused-function]
warning: static void rustsecp256k1_v0_4_0_ge_set_infinity(rustsecp256k1_v0_4_0_ge *r) {
warning:             ^
warning: depend/secp256k1/src/group_impl.h:658:12: warning: unused function 'rustsecp256k1_v0_4_0_gej_has_quad_y_var' [-Wunused-function]
warning: static int rustsecp256k1_v0_4_0_gej_has_quad_y_var(const rustsecp256k1_v0_4_0_gej *a) {
warning:            ^
warning: In file included from depend/secp256k1/src/secp256k1.c:16:
warning: In file included from depend/secp256k1/src/ecmult_impl.h:16:
warning: In file included from depend/secp256k1/src/ecmult.h:13:
warning: depend/secp256k1/src/scratch.h:24:38: warning: unused function 'rustsecp256k1_v0_4_0_scratch_create' [-Wunused-function]
warning: static rustsecp256k1_v0_4_0_scratch* rustsecp256k1_v0_4_0_scratch_create(const rustsecp256k1_v0_4_0_callback* error_callback, size_t max_size);
warning:                                      ^
warning: depend/secp256k1/src/scratch.h:26:13: warning: unused function 'rustsecp256k1_v0_4_0_scratch_destroy' [-Wunused-function]
warning: static void rustsecp256k1_v0_4_0_scratch_destroy(const rustsecp256k1_v0_4_0_callback* error_callback, rustsecp256k1_v0_4_0_scratch* scratch);
warning:             ^
warning: In file included from depend/secp256k1/src/secp256k1.c:16:
warning: depend/secp256k1/src/ecmult_impl.h:1035:12: warning: unused function 'rustsecp256k1_v0_4_0_ecmult_multi_var' [-Wunused-function]
warning: static int rustsecp256k1_v0_4_0_ecmult_multi_var(const rustsecp256k1_v0_4_0_callback* error_callback, const rustsecp256k1_v0_4_0_ecmult_context *ctx, rustsecp256k1_v0_4_0_scratch *scratch, rustsecp256k1_v0_4_0_gej *r, const rustsecp256k1_v0_4_0_scalar *inp_g_sc, rustsecp256k1_v0_4_0_ecmult_multi_callback cb, void *cbdata, size_t n) { 
warning:            ^
warning: depend/secp256k1/src/ecmult_impl.h:621:12: warning: unused function 'rustsecp256k1_v0_4_0_ecmult_strauss_batch_single' [-Wunused-function]
warning: static int rustsecp256k1_v0_4_0_ecmult_strauss_batch_single(const rustsecp256k1_v0_4_0_callback* error_callback, const rustsecp256k1_v0_4_0_ecmult_context *actx, rustsecp256k1_v0_4_0_scratch *scratch, rustsecp256k1_v0_4_0_gej *r, const rustsecp256k1_v0_4_0_scalar *inp_g_sc, rustsecp256k1_v0_4_0_ecmult_multi_callback cb, void *cbdata, 
size_t n) {
warning:            ^
warning: depend/secp256k1/src/ecmult_impl.h:863:15: warning: unused function 'rustsecp256k1_v0_4_0_pippenger_scratch_size' [-Wunused-function]
warning: static size_t rustsecp256k1_v0_4_0_pippenger_scratch_size(size_t n_points, int bucket_window) {
warning:               ^
warning: depend/secp256k1/src/ecmult_impl.h:944:12: warning: unused function 'rustsecp256k1_v0_4_0_ecmult_pippenger_batch_single' [-Wunused-function]
warning: static int rustsecp256k1_v0_4_0_ecmult_pippenger_batch_single(const rustsecp256k1_v0_4_0_callback* error_callback, const rustsecp256k1_v0_4_0_ecmult_context *actx, rustsecp256k1_v0_4_0_scratch *scratch, rustsecp256k1_v0_4_0_gej *r, const rustsecp256k1_v0_4_0_scalar *inp_g_sc, rustsecp256k1_v0_4_0_ecmult_multi_callback cb, void *cbdata, size_t n) {
warning:            ^
warning: 19 warnings generated.

error: build failed

[aleksuss]

Actually, wasm isn't supported 🙂

[mihai-dinculescu]

Are there any plans to support it?

[aleksuss]

Not yet.

[okpatil4u]

Has there been any change in this strategy ?