Rust web assembly fails to build with openssl error

Question

I am fairly new to rust and I build a web assembly project using it, am using openssl package in the project. Now the problem comes when I want to build the app, it fails with the following output:

[INFO]: Checking for the Wasm target...
[INFO]: Compiling to Wasm...
   Compiling openssl-sys v0.9.58
error: failed to run custom build command for `openssl-sys v0.9.58`

Caused by:
  process didn't exit successfully: `/home/hamisi/Projects/payment-gateway/checkout/web/payload-formatter-wasm/target/release/build/openssl-sys-815e530f9615c049/build-script-main` (exit code: 101)
--- stdout
cargo:rustc-cfg=const_fn
cargo:rerun-if-env-changed=WASM32_UNKNOWN_UNKNOWN_OPENSSL_NO_VENDOR
WASM32_UNKNOWN_UNKNOWN_OPENSSL_NO_VENDOR unset
cargo:rerun-if-env-changed=OPENSSL_NO_VENDOR
OPENSSL_NO_VENDOR unset
CC_wasm32-unknown-unknown = None
CC_wasm32_unknown_unknown = None
TARGET_CC = None
CC = None
CFLAGS_wasm32-unknown-unknown = None
CFLAGS_wasm32_unknown_unknown = None
TARGET_CFLAGS = None
CFLAGS = None
CRATE_CC_NO_DEFAULTS = None
DEBUG = Some("false")
running "perl" "./Configure" "--prefix=/home/hamisi/Projects/payment-gateway/checkout/web/payload-formatter-wasm/target/wasm32-unknown-unknown/release/build/openssl-sys-881fa1458604c2ea/out/openssl-build/install" "no-dso" "no-ssl3" "no-unit-test" "no-comp" "no-zlib" "no-zlib-dynamic" "no-shared" "gcc" "-O2" "-ffunction-sections" "-fdata-sections" "-fPIC" "--target=wasm32-unknown-unknown"
Configuring OpenSSL version 1.1.1g (0x1010107fL) for gcc
Using os-specific seed configuration
Creating configdata.pm
Creating Makefile

The library could not be configured for supporting multi-threaded
applications as the compiler options required on this system are not known.
See file INSTALL for details if you need multi-threading.

**********************************************************************
***                                                                ***
***   OpenSSL has been successfully configured                     ***
***                                                                ***
***   If you encounter a problem while building, please open an    ***
***   issue on GitHub <https://github.com/openssl/openssl/issues>  ***
***   and include the output from the following command:           ***
***                                                                ***
***       perl configdata.pm --dump                                ***
***                                                                ***
***   (If you are new to OpenSSL, you might want to consult the    ***
***   'Troubleshooting' section in the INSTALL file first)         ***
***                                                                ***
**********************************************************************
running "make" "depend"
running "make" "build_libs"
/usr/bin/perl "-I." -Mconfigdata "util/dofile.pl" \
    "-oMakefile" include/crypto/bn_conf.h.in > include/crypto/bn_conf.h
/usr/bin/perl "-I." -Mconfigdata "util/dofile.pl" \
    "-oMakefile" include/crypto/dso_conf.h.in > include/crypto/dso_conf.h
/usr/bin/perl "-I." -Mconfigdata "util/dofile.pl" \
    "-oMakefile" include/openssl/opensslconf.h.in > include/openssl/opensslconf.h
make depend && make _build_libs
make[1]: Entering directory '/home/hamisi/Projects/payment-gateway/checkout/web/payload-formatter-wasm/target/wasm32-unknown-unknown/release/build/openssl-sys-881fa1458604c2ea/out/openssl-build/build/src'
make[1]: Leaving directory '/home/hamisi/Projects/payment-gateway/checkout/web/payload-formatter-wasm/target/wasm32-unknown-unknown/release/build/openssl-sys-881fa1458604c2ea/out/openssl-build/build/src'
make[1]: Entering directory '/home/hamisi/Projects/payment-gateway/checkout/web/payload-formatter-wasm/target/wasm32-unknown-unknown/release/build/openssl-sys-881fa1458604c2ea/out/openssl-build/build/src'
clang  -I. -Iinclude  -O3 -O2 -ffunction-sections -fdata-sections -fPIC --target=wasm32-unknown-unknown -DOPENSSLDIR="\"/home/hamisi/Projects/payment-gateway/checkout/web/payload-formatter-wasm/target/wasm32-unknown-unknown/release/build/openssl-sys-881fa1458604c2ea/out/openssl-build/install/ssl\"" -DENGINESDIR="\"/home/hamisi/Projects/payment-gateway/checkout/web/payload-formatter-wasm/target/wasm32-unknown-unknown/release/build/openssl-sys-881fa1458604c2ea/out/openssl-build/install/lib/engines-1.1\"" -DNDEBUG   -c -o apps/app_rand.o apps/app_rand.c
clang  -I. -Iinclude  -O3 -O2 -ffunction-sections -fdata-sections -fPIC --target=wasm32-unknown-unknown -DOPENSSLDIR="\"/home/hamisi/Projects/payment-gateway/checkout/web/payload-formatter-wasm/target/wasm32-unknown-unknown/release/build/openssl-sys-881fa1458604c2ea/out/openssl-build/install/ssl\"" -DENGINESDIR="\"/home/hamisi/Projects/payment-gateway/checkout/web/payload-formatter-wasm/target/wasm32-unknown-unknown/release/build/openssl-sys-881fa1458604c2ea/out/openssl-build/install/lib/engines-1.1\"" -DNDEBUG   -c -o apps/apps.o apps/apps.c
clang  -I. -Iinclude  -O3 -O2 -ffunction-sections -fdata-sections -fPIC --target=wasm32-unknown-unknown -DOPENSSLDIR="\"/home/hamisi/Projects/payment-gateway/checkout/web/payload-formatter-wasm/target/wasm32-unknown-unknown/release/build/openssl-sys-881fa1458604c2ea/out/openssl-build/install/ssl\"" -DENGINESDIR="\"/home/hamisi/Projects/payment-gateway/checkout/web/payload-formatter-wasm/target/wasm32-unknown-unknown/release/build/openssl-sys-881fa1458604c2ea/out/openssl-build/install/lib/engines-1.1\"" -DNDEBUG   -c -o apps/bf_prefix.o apps/bf_prefix.c
make[1]: Leaving directory '/home/hamisi/Projects/payment-gateway/checkout/web/payload-formatter-wasm/target/wasm32-unknown-unknown/release/build/openssl-sys-881fa1458604c2ea/out/openssl-build/build/src'

--- stderr
/bin/sh: 1: clang: not found
make[1]: *** [Makefile:672: apps/app_rand.o] Error 127
make[1]: *** Waiting for unfinished jobs....
/bin/sh: 1: clang: not found
make[1]: *** [Makefile:674: apps/apps.o] Error 127
/bin/sh: 1: clang: not found
make[1]: *** [Makefile:676: apps/bf_prefix.o] Error 127
make: *** [Makefile:175: build_libs] Error 2
thread 'main' panicked at '


Error building OpenSSL:
    Command: "make" "build_libs"
    Exit status: exit code: 2


    ', /home/hamisi/.cargo/registry/src/github.com-1ecc6299db9ec823/openssl-src-111.10.0+1.1.1g/src/lib.rs:386:13
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

Error: Compiling your crate to WebAssembly failed
Caused by: failed to execute `cargo build`: exited with exit code: 101
  full command: "cargo" "build" "--lib" "--release" "--target" "wasm32-unknown-unknown"

I have tried every solution in the internet, installed libssldev , pkg-config , I also reinstalled openssl in my machine several times, still no fruits. I have debugged this for hours without any success.

The following is my Cargo.toml content dependencies section

[dependencies]
wasm-bindgen = "0.2.63"
openssl-sys = "0.9"
openssl = { version = "0.10", features = ["vendored"] }
base64 = "0.12.1"

and am using ubuntu 20.04 . Any help would be highly appreciated as am running out of time with this, thanks in advance.

openssl version outputs OpenSSL 1.1.1g 21 Apr 2020

Also let me know when you need any more information.

Answer 1

According to rustwasm/wasm-bindgen, openssl crate does not support WebAssembly

This is actually an error reported by the openssl-sys build script and that's because the openssl crate doesn't have support for WebAssembly yet (I'm not sure that OpenSSL itself even does...).