Download and compile libsodium to wasm using wasi-sdk

.gitignore

/tmp/
/lib/

log.log

# $ ./test.sh > log.log 2>&1
~/src/github.com/wasi-sdk-test/tmp ~/src/github.com/wasi-sdk-test
--2020-06-05 09:11:56--  https://github.com/jedisct1/libsodium/releases/download/1.0.18-RELEASE/libsodium-1.0.18.tar.gz
Resolving github.com (github.com)... 140.82.118.3
Connecting to github.com (github.com)|140.82.118.3|:443... connected.
HTTP request sent, awaiting response... 302 Found
Location: https://github-production-release-asset-2e65be.s3.amazonaws.com/7710647/e52f2f80-b05e-11e9-82d6-073fa3532c76?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAIWNJYAX4CSVEH53A%2F20200605%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20200605T071031Z&X-Amz-Expires=300&X-Amz-Signature=bf00a70658528de36119000082a48d773357b564170b37977e85ecf746908add&X-Amz-SignedHeaders=host&actor_id=0&repo_id=7710647&response-content-disposition=attachment%3B%20filename%3Dlibsodium-1.0.18.tar.gz&response-content-type=application%2Foctet-stream [following]
--2020-06-05 09:11:57--  https://github-production-release-asset-2e65be.s3.amazonaws.com/7710647/e52f2f80-b05e-11e9-82d6-073fa3532c76?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAIWNJYAX4CSVEH53A%2F20200605%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20200605T071031Z&X-Amz-Expires=300&X-Amz-Signature=bf00a70658528de36119000082a48d773357b564170b37977e85ecf746908add&X-Amz-SignedHeaders=host&actor_id=0&repo_id=7710647&response-content-disposition=attachment%3B%20filename%3Dlibsodium-1.0.18.tar.gz&response-content-type=application%2Foctet-stream
Resolving github-production-release-asset-2e65be.s3.amazonaws.com (github-production-release-asset-2e65be.s3.amazonaws.com)... 52.216.98.251
Connecting to github-production-release-asset-2e65be.s3.amazonaws.com (github-production-release-asset-2e65be.s3.amazonaws.com)|52.216.98.251|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 1919817 (1.8M) [application/octet-stream]
Saving to: ‘libsodium-1.0.18.tar.gz’

     0K .......... .......... .......... .......... ..........  2%  123K 15s
 41500K .......... .......... .                               100% 31.4M=6.1s

2020-06-05 09:12:07 (6.69 MB/s) - ‘wasi-sdk-10.0-macos.tar.gz’ saved [42517892/42517892]

~/src/github.com//wasi-sdk-test
CC: clang
clang: /Users/myobie/src/github.com/wasi-sdk-test/tmp/wasi-sdk-10.0/bin/clang
~/src/github.com/wasi-sdk-test/tmp/libsodium-1.0.18 ~/src/github.com/wasi-sdk-test
checking build system type... i386-apple-darwin19.5.0
checking host system type... wasm32-unknown-wasi
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for wasm32-wasi-strip... llvm-strip
checking for a thread-safe mkdir -p... build-aux/install-sh -c -d
checking for gawk... gawk
checking whether make sets $(MAKE)... yes
checking whether make supports nested variables... yes
checking whether UID '501' is supported by ustar format... yes
checking whether GID '20' is supported by ustar format... yes
checking how to create a ustar tar archive... gnutar
checking whether make supports nested variables... (cached) yes
checking whether to enable maintainer-specific portions of Makefiles... no
checking whether make supports the include directive... yes (GNU style)
checking for wasm32-wasi-gcc... clang
checking whether the C compiler works... no
configure: error: in `/Users/myobie/src/github.com/wasi-sdk-test/tmp/libsodium-1.0.18':
configure: error: C compiler cannot create executables
See `config.log' for more details

test.sh

#!/bin/bash

set -e
set -o pipefail

rm -rf {tmp,lib}
mkdir -p {tmp,lib}

pushd tmp

wget https://github.com/jedisct1/libsodium/releases/download/1.0.18-RELEASE/libsodium-1.0.18.tar.gz
tar -xf libsodium-1.0.18.tar.gz

wget https://github.com/WebAssembly/wasi-sdk/releases/download/wasi-sdk-10/wasi-sdk-10.0-macos.tar.gz
tar -xf wasi-sdk-10.0-macos.tar.gz

popd

export PATH="$(cd tmp/wasi-sdk-10.0/bin && pwd):$PATH"
export WASI_SYSROOT="$(cd tmp/wasi-sdk-10.0/share/wasi-sysroot && pwd)"

export CC="clang" # NOTE: uncomment and this script will fail
export NM="llvm-nm"
export AR="llvm-ar"
export RANLIB="llvm-ranlib"
export STRIP="llvm-strip"

pushd tmp/libsodium-1.0.18

cat <<-'EOF' >src/main.c
#include <sodium.h>

int main(void)
{
    return sodium_init();
}
EOF

mkdir -p wasm-build
PREFIX=$(cd wasm-build && pwd)

./configure --prefix="${PREFIX}" \
  --with-sysroot="$WASI_SYSROOT" \
  --host=wasm32-wasi \
  --disable-ssp --disable-shared

FILES=$(find src -name "*.c")

clang \
  --target=wasm32-wasi \
  --sysroot="${WASI_SYSROOT}" \
  -isysroot="${WASI_SYSROOT}" \
  -Oz \
  -flto \
  -I src/libsodium/include \
  -I src/libsodium/include/sodium \
  -D _WASI_EMULATED_SIGNAL=1 \
  -D ED25519_NONDETERMINISTIC=1 \
  -D CONFIGURED=1 \
  -Wl,--export-all \
  -Wl,--lto-O2 \
  -o ../../lib/sodium.wasm \
  $FILES

popd

pushd lib

wasm2wat sodium.wasm -o sodium.wat

popd

rm -rf ./tmp/