[llvm] [AArch64][Build Attributes] Improve Parsing and Formatting (PR #126530)

[Oliver Stannard via llvm-commits]

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@@ -0,0 +1,50 @@
+// RUN: llvm-mc -triple=aarch64 %s -o - | FileCheck %s --check-prefix=ASM
+// RUN: llvm-mc -triple=aarch64 -filetype=obj %s -o - | llvm-readelf --hex-dump=.ARM.attributes - | FileCheck %s --check-prefix=ELF
+
+// ASM: .aeabi_subsection	subsection_a, optional, uleb128
+// ASM: .aeabi_subsection	aeabi_subsection, optional, ntbs
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ostannard wrote:

What is the difference between `AArch64TargetAsmStreamer` and, for example, the ARM equivalent, where the `.eabi_attribute` directive emits a comment without any spurious newlines?

Does this occur when generating code from IR (using llc or clang), or only when parsing assembly? That might help narrow down which code path the bug is in.

https://github.com/llvm/llvm-project/pull/126530