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rustc: Some small changes for the wasm32-wasip2 target #124858

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merged 3 commits into from
May 8, 2024
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rustc: Some small changes for the wasm32-wasip2 target #124858

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7a77108
rustc: Change LLVM target for the wasm32-wasip2 Rust target
alexcrichton May 3, 2024
400e754
rustc: Don't pass `-fuse-ld=lld` on wasm targets
alexcrichton May 4, 2024
38b2bd7
rustc: Change wasm32-wasip2 to PIC-by-default
alexcrichton May 7, 2024
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rustc: Change wasm32-wasip2 to PIC-by-default 
This commit changes the new `wasm32-wasip2` target to being PIC by
default rather than the previous non-PIC by default. This change is
intended to make it easier for the standard library to be used in a
shared object in its precompiled form. This comes with a hypothetical
modest slowdown but it's expected that this is quite minor in most use
cases or otherwise wasm compilers and/or optimizing runtimes can elide
the cost.
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@alexcrichton
alexcrichton committed May 7, 2024
commit 38b2bd782b251b4d729ba8fd9daadc774f9b4008
7 changes: 6 additions & 1 deletion compiler/rustc_target/src/spec/targets/wasm32_wasip2.rs
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Expand Up @@ -18,7 +18,7 @@

use crate::spec::crt_objects;
use crate::spec::LinkSelfContainedDefault;
use crate::spec::{base, Target};
use crate::spec::{base, RelocModel, Target};

pub fn target() -> Target {
let mut options = base::wasm::options();
Expand Down Expand Up @@ -54,6 +54,11 @@ pub fn target() -> Target {
// signatures.
options.entry_name = "__main_void".into();

// Default to PIC unlike base wasm. This makes precompiled objects such as
// the standard library more suitable to be used with shared libaries a la
// emscripten's dynamic linking convention.
options.relocation_model = RelocModel::Pic;

Target {
llvm_target: "wasm32-wasip2".into(),
metadata: crate::spec::TargetMetadata {
Expand Down
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