[llvm-bugs] [Bug 51207] New: Cannot mark llvmbc section as SHF_EXCLUDE

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=51207

            Bug ID: 51207
           Summary: Cannot mark llvmbc section as SHF_EXCLUDE
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: nikita.ppv at gmail.com
                CC: htmldeveloper at gmail.com, i at maskray.me,
                    llvm-bugs at lists.llvm.org

After
https://github.com/llvm/llvm-project/commit/82d0749749fafb0303414131dc570781376fdcfb
this IR

module asm ".section .llvmbc,\22e\22"
@rustc.embedded.module = private constant [3 x i8] c"ABC", section ".llvmbc"

when run through llc results in an "Unknown section kind" assertion failure.

rustc emits this IR here, which has a comment explaining why it does so:
https://github.com/rust-lang/rust/blob/bddb59cf07efcf6e606f16b87f85e3ecd2c1ca69/compiler/rustc_codegen_llvm/src/back/write.rs#L970-L1017

I'm not sure where the bug is here -- what rustc is doing certainly looks
fishy, but I'm not sure what it is supposed to be doing instead. Any advice?

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