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a5ededd556
Currently, for any extern variable, if it doesn't have section attribution, it will be put into a default ".extern" btf DataSec. The initial design is to put every extern variable in a DataSec so libbpf can use it. But later on, libbpf actually requires extern variables to put into special sections, e.g., ".kconfig", ".ksyms", etc. so they can be used properly based on section name. Andrii mentioned since ".extern" variables are not actually used, it makes sense to remove it from the compiler so libbpf does not need to deal with it, esp. for static linking. The BTF for these extern variables is still generated. With this patch, I tested kernel selftests/bpf and all tests passed. Indeed, removing ".extern" DataSec seems having no impact. Differential Revision: https://reviews.llvm.org/D100392 |
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