I've faced similar issue renaming segnemtnts in my binary using ld64 options like that:
"-Wl,-rename_section,__TEXT,__cstring,__RE_TEXT,__cstring",
"-Wl,-rename_section,__TEXT,__ustring,__RE_TEXT,__ustring",
Measuring mechanism couldn't detect signposts. I believe this is because of address mismatch of strings used as metric name. os_signpost receives name StaticString, instead of just String.
Renaming code segment like that:
"-Wl,-rename_section,__TEXT,__text,__RE_TEXT,__text",
didn't broke metrics collection in my case.
ishutin
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