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When building gdb with "-Wall -O2 -g -flto=auto", I run into: ... (gdb) call clear_complaints()^M No symbol "clear_complaints" in current context.^M (gdb) FAIL: gdb.gdb/complaints.exp: clear complaints ... The problem is that lto has optimized away clear_complaints, and consequently the selftests cannot run. Fix this by: - using info function to detect presence of clear_complaints - handling the absence of clear_complaints by calling untested ... (gdb) UNTESTED: gdb.gdb/complaints.exp: \ Cannot find clear_complaints, skipping test ... Tested on x86_64-linux. gdb/testsuite/ChangeLog: 2021-09-03 Tom de Vries <tdevries@suse.de> * gdb.gdb/complaints.exp: Use untested if clear_complaints cannot be found.