From 471db2b84bbeafb128bae8a8a9cf7fed13d2df4f Mon Sep 17 00:00:00 2001 From: Alex Crichton Date: Thu, 4 Apr 2019 13:23:42 -0700 Subject: [PATCH] wasm32: Default to a "static" relocation model LLVM 9 is adding support for a "pic" relocation model for wasm code, which is quite different than the current model. In order to preserve the mode of compilation that we have today default to "static" to ensure that we don't accidentally start creating experimental relocatable binaries. --- src/librustc_target/spec/wasm32_base.rs | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/src/librustc_target/spec/wasm32_base.rs b/src/librustc_target/spec/wasm32_base.rs index c7e75b4fa0903..edaf902c130d8 100644 --- a/src/librustc_target/spec/wasm32_base.rs +++ b/src/librustc_target/spec/wasm32_base.rs @@ -118,6 +118,15 @@ pub fn options() -> TargetOptions { pre_link_args, + // This has no effect in LLVM 8 or prior, but in LLVM 9 and later when + // PIC code is implemented this has quite a drastric effect if it stays + // at the default, `pic`. In an effort to keep wasm binaries as minimal + // as possible we're defaulting to `static` for now, but the hope is + // that eventually we can ship a `pic`-compatible standard library which + // works with `static` as well (or works with some method of generating + // non-relative calls and such later on). + relocation_model: "static".to_string(), + .. Default::default() } }