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Otherwise the compiler may optimize out the reference to the symbol as the previous version was not really using this. This leads to symbols that are only in a header but not in the given libraries to be reported as present. This came up on the first try to fix bug 11333 as "gcc -O3" would optimize out the reference to pthread_create() so the correct library the symbol is in was not detected. The new test code was suggested by Brad King.
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