Switch to force loading std for panic_handler

Summary: When building buck sysroot from source, `#[no_std]` crates would fail to link as shared libraries, citing "missing #[panic_handler]". Matt introduced a mechanism in rust-lang/rust#109421 that allows us to still link in the default panic handler from `std`, even if the rest of the crate is completely unused (as is the case with `no_std` crates). The net result is that we no longer need to force static linkage when building no_std crates with buckified sysroot. Reviewed By: zertosh Differential Revision: D47402849 fbshipit-source-id: 35e31c7ff6d5683ff32a3c1eb2d67acec57acc8f
facebook · Jul 14, 2023 · 2981ee5 · 2981ee5
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diff --git a/shim/third-party/rust/fixups/inventory/fixups.toml b/shim/third-party/rust/fixups/inventory/fixups.toml
diff --git a/shim/third-party/rust/fixups/libm/fixups.toml b/shim/third-party/rust/fixups/libm/fixups.toml
@@ -1,3 +1 @@
-# #[no_std] cannot be built with shared linkage
-preferred_linkage = "static"
 buildscript = []