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In commit fec441ec (Teach CROSSCOMPILING_EMULATOR to support arguments, 2019-05-30, v3.15.0-rc1~6^2) the new member `cmCustomCommandGenerator::EmulatorsWithArguments` was not initialized to the proper size. Fix this and add a test case covering the crash that could occur with multiple commands where an emulator appears only in a later command. Fixes: #19500 Co-Author: Brad King <brad.king@kitware.com>
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