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4983bb052d
Before now, we were relying on gcc -B to repoint GCC at our freshly-built linker, and assuming we could use this to run tests that do linker dedup. This is, alas, not reliable (building --with-ld=/an/absolute/path bypasses -B searches for the linker), and we would like the libctf tests in particular to not fail if the compiler uses a linker that cannot deduplicate (simply skipping such tests). Add a new testsuite function that tries to link one of the lookup tests' testcases (which is known to produce conflicting types, i.e. a dict with per-translation-unit children) and then does an objdump and greps it for signs of the per-translation-unit children. If there are none, the linker probably just concatenated the sections: i.e., it is not a linker that can deduplicate CTF. libctf/ PR libctf/33162 * testsuite/config/default.exp (objdump): Introduce. (OBJDUMPFLAGS): Likewise. * testsuite/lib/ctf-lib.exp (check_ctf_linker_dedup): New. * testsuite/libctf-lookup/lookup.exp: Use it. * testsuite/libctf-regression/libctf-repeat-cu.exp: Likewise. * testsuite/libctf-regression/regression.exp: Likewise.