[build-script] Skip libLTO in sanitizer presets (#91274) - #91400
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On macOS, ld dlopens libLTO.dylib eagerly at startup to probe LTO capabilities. When the swift-built libLTO is sanitized, dyld pulls the sanitizer runtime into ld's process, and AMFI's sanitizer-load platform policy on recent macOS versions rejects it, aborting the link. Skip building libLTO in the sanitizer presets so ld falls back to Xcode's unsanitized copy; these presets don't exercise LTO codegen. (cherry picked from commit f3bea01) Signed-off-by: Duo Wang <duo_wang@apple.com>
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shahmishal
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On macOS, ld dlopens libLTO.dylib eagerly at startup to probe LTO capabilities. When the swift-built libLTO is sanitized, dyld pulls the sanitizer runtime into ld's process, and AMFI's sanitizer-load platform policy on recent macOS versions rejects it, aborting the link. Skip building libLTO in the sanitizer presets so ld falls back to Xcode's unsanitized copy; these presets don't exercise LTO codegen.
This only affects the ASAN CI jobs.
Build failure in the new ASAN CI job being brought up.
[build-script] Skip libLTO in sanitizer presets #91274
Low. The ASAN preset does not exercise LTO so we lose little to no test coverage.
Tested in the new ASAN CI job being brought up.
@ndrewh