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cfi .a's can't be used #2522

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nekopsykose opened this issue Jul 18, 2024 · 0 comments

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nekopsykose commented Jul 18, 2024

currently if you try link against a cfi-built .a you merely get

ld: error: inconsistent LTO Unit splitting (recompile with -fsplit-lto-unit)

this is because fsanitize=cfi implies -fsplit-lto-unit, and -fsplit-lto-unit requires everything built with lto to also have it set.

it works to merely add

--- a/src/cbuild/core/profile.py
+++ b/src/cbuild/core/profile.py
@@ -113,6 +113,7 @@ def _get_archflags(prof, tmpl, hard):
         sflags.append("-fno-sanitize-recover")
 
     if lto:
+        sflags.append("-fsplit-lto-unit")
         if tmpl.options["ltofull"]:
             sflags.append("-flto")
         else:

but that requires a world rebuild

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