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Don't compile C code on riscv targets 

This fixes a longstanding bug in compiler-builtins where C code was
compiled for the riscv targets but when distributed in rust-lang/rust
all the C code was actually compiled for x86_64 since there is no
configured C compiler for riscv. This was exposed by #286 by accident
but the underlying cause was somewhat unrelated.

For now we forcibly disable C code for riscv targets, and when the C
compiler story is sorted out in rust-lang/rust and with `cc-rs` we can
reenable. For now just use all the Rust definitions.

cc rust-lang/rust#60747
This commit is contained in:
Alex Crichton 2019-05-14 14:29:29 -07:00
parent e3b53f9142
commit e4f46b91ca
1 changed files with 9 additions and 2 deletions
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11
build.rs
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@ -37,8 +37,15 @@ fn main() {
// build anything and we rely on the upstream implementation of compiler-rt
// functions
if !cfg!(feature = "mangled-names") && cfg!(feature = "c") {
// Don't use C compiler for bitcode-only wasm and nvptx
if !target.contains("wasm32") && !target.contains("nvptx") {
// Don't use a C compiler for these targets:
//
// * wasm32 - clang 8 for wasm is somewhat hard to come by and it's
// unlikely that the C is really that much better than our own Rust.
// * nvptx - everything is bitcode, not compatible with mixed C/Rust
// * riscv - the rust-lang/rust distribution container doesn't have a C
// compiler nor is cc-rs ready for compilation to riscv (at this
// time). This can probably be removed in the future
if !target.contains("wasm32") && !target.contains("nvptx") && !target.starts_with("riscv") {
#[cfg(feature = "c")]
c::compile(&llvm_target);
println!("cargo:rustc-cfg=use_c");