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186: do not KEEP the .stack_sizes section r=therealprof a=japaric this undoes PR #118 I found a problem with keeping this section. Turns out that the input `.stack_sizes` sections contain references to all functions compiled with `-Z emit-stack-sizes` (the section contains the addresses of all those functions after all) so keeping those section prevents the linker from removing *any* of those functions. This is not a problem today because `-Z emit-stack-sizes` is *opt-in* and only used to analyze a program. However, I am proposing a rust-lang/rust PR to build the `compiler-builtins` crate with `-Z emit-stack-sizes`. That change will cause *all* the functions in that crate to be kept in binaries that link to `cortex-m-rt`, regardless of whether the crate author uses `-Z emit-stack-sizes` or not, leading a increase in binary size of about 14 KB (`.text` section). To prevent issues with that rust-lang/rust PR I propose we undo PR #118. On the bright side, the tools that were depending on this (`cargo-stack-sizes` and `cargo-call-stack`) no longer do so in their latest releases so nothing is lost on the tooling front with this change. r? @rust-embedded/cortex-m Co-authored-by: Jorge Aparicio <jorge@japaric.io>
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