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#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
#
# The per-function checksums klp checksum records are what klp diff uses to
# decide which functions changed. A checksum covering too little misses a real
# change and the patch silently omits the function; one covering too much, or
# unstable across identical input, clones functions nobody patched and drags
# their dependencies in with them.
#
# test-basic covers which functions got cloned, which is downstream of this and
# passes for either kind of wrong checksum as long as the two errors do not
# happen to cancel. This checks the checksums themselves.
. "$(dirname "$0")/../lib.sh"
setup
build_pair basic.c
assert_input_symbol changed
assert_input_symbol untouched
run_checksum
# The edited function's checksum has to move, the untouched one's must not.
assert_checksum_differs changed
assert_checksum_matches untouched
# And it has to be a function of the code, not of the build: checksumming the
# same input twice has to give the same answer, or every rebuild reports
# spurious changes.
first="$(checksum_of orig.o changed)"
build_pair basic.c
run_checksum
[ "$(checksum_of orig.o changed)" = "$first" ] ||
fail "checksum for 'changed' differs between builds of identical source"
pass "checksums track the changed function and are stable across rebuilds"
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