1#!/bin/bash
2
3# A script to build the release artifacts of Wasmtime into the `target`
4# directory. For now this is the CLI and the C API. Note that this script only
5# produces the artifacts through Cargo and doesn't package things up. That's
6# intended for the `build-tarballs.sh` script.
7#
8# This script takes a Rust target as its first input and optionally a parameter
9# afterwards which can be "-min" to indicate that a minimal build should be
10# produced with as many features as possible stripped out.
11
12set -ex
13
14build=$1
15target=$2
16wrapper=""
17
18# If `$DOCKER_IMAGE` is set then run the build inside of that docker container
19# instead of on the host machine. In CI this uses `./ci/docker/*/Dockerfile` to
20# have precise glibc requirements for Linux platforms for example.
21if [ "$DOCKER_IMAGE" != "" ]; then
22  if [ -f "$DOCKER_IMAGE" ]; then
23    docker build --tag build-image --file $DOCKER_IMAGE ci/docker
24    DOCKER_IMAGE=build-image
25  fi
26
27  # Inherit the environment's rustc and env vars related to cargo/rust, and then
28  # otherwise re-execute ourselves and we'll be missing `$DOCKER_IMAGE` in the
29  # container so we'll continue below.
30  exec docker run --interactive \
31    --volume `pwd`:`pwd` \
32    --volume `rustc --print sysroot`:/rust:ro \
33    --workdir `pwd` \
34    --interactive \
35    --env-file <(env | grep 'CARGO\|RUST') \
36    $DOCKER_IMAGE \
37    bash -c "PATH=\$PATH:/rust/bin RUSTFLAGS=\"\$RUSTFLAGS \$EXTRA_RUSTFLAGS\" `pwd`/$0 $*"
38fi
39
40# Default build flags for release artifacts. Leave debugging for
41# builds-from-source which have richer information anyway, and additionally the
42# CLI won't benefit from catching unwinds and neither will the C API so use
43# panic=abort in both situations.
44export CARGO_PROFILE_RELEASE_STRIP=debuginfo
45export CARGO_PROFILE_RELEASE_PANIC=abort
46
47if [[ "$build" = *-min ]]; then
48  # Configure a whole bunch of compile-time options which help reduce the size
49  # of the binary artifact produced.
50  export CARGO_PROFILE_RELEASE_OPT_LEVEL=s
51  export RUSTFLAGS="-Zlocation-detail=none $RUSTFLAGS"
52  export CARGO_PROFILE_RELEASE_CODEGEN_UNITS=1
53  export CARGO_PROFILE_RELEASE_LTO=true
54  build_std=-Zbuild-std=std,panic_abort
55  flags="$build_std --no-default-features --features disable-logging"
56  cmake_flags="-DWASMTIME_DISABLE_ALL_FEATURES=ON"
57  cmake_flags="$cmake_flags -DWASMTIME_FEATURE_DISABLE_LOGGING=ON"
58  cmake_flags="$cmake_flags -DWASMTIME_USER_CARGO_BUILD_OPTIONS:LIST=$build_std"
59else
60  # For release builds the CLI is built a bit more feature-ful than the Cargo
61  # defaults to provide artifacts that can do as much as possible.
62  bin_flags="--features all-arch,component-model,gdbstub"
63fi
64
65if [[ "$target" = "x86_64-pc-windows-msvc" ]]; then
66  # Avoid emitting `/DEFAULTLIB:MSVCRT` into the static library by using clang.
67  export CC=clang
68  export CXX=clang++
69fi
70
71cargo build --release $flags --target $target -p wasmtime-cli $bin_flags --features run
72
73# For the C API force unwind tables to be emitted to make the generated objects
74# more flexible. Embedders can always build without this but this enables
75# libunwind to produce better backtraces by default when Wasmtime is linked into
76# a different project that wants to unwind.
77export RUSTFLAGS="$RUSTFLAGS -C force-unwind-tables"
78
79# Shrink the size of `*.a` artifacts without spending too much extra time in CI.
80# See #11476 for some more context. Here Windows builds achieve this with 1 CGU
81# which results in modest size gains, and other platforms use LTO to achieve
82# much more significant size gains. The reason the platforms are different is
83# that CI is extremely slow on Windows, almost 2x slower, so this is an attempt
84# to keep CI cycle time under control.
85case $build in
86  *-mingw* | *-windows*)
87    export CARGO_PROFILE_RELEASE_CODEGEN_UNITS=1
88    ;;
89  *)
90    export CARGO_PROFILE_RELEASE_LTO=true
91    ;;
92esac
93
94mkdir -p target/c-api-build
95cd target/c-api-build
96cmake \
97  -G Ninja \
98  ../../crates/c-api \
99  $cmake_flags \
100  -DCMAKE_BUILD_TYPE=Release \
101  -DWASMTIME_TARGET=$target \
102  -DCMAKE_INSTALL_PREFIX=../c-api-install \
103  -DCMAKE_INSTALL_LIBDIR=../c-api-install/lib
104cmake --build . --target install
105