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Correctly running GCC testsuites with an installed compiler requires both the canonical and noncanonical versions of the target triplet: the canonical one for where the testsuite matches on target triplets, and the noncanonical one for various "transform" calls used to find binutils programs. Make test_installed use config.sub to determine the canonical target from any value passed with --target= (and thus make logic to locate the toplevel source directory from its own location unconditional, as it's now used to locate config.sub). * test_installed: Use config.sub to determine canonical target.
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