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I this case, it doesn't really mean that the built library is wrong, and actually installing and using the compiler/library will be fine, as long as the precompiled header isn't used (it's not by default, so it's not an issue.) You can verify this by either running 'make check' of the library with testsuite_flags configured to not include the PCHFLAGS, or removing the generated PCH files in the stdc++.h.gch directory and touching them with a zero-size file (ie, what is done for stdc++.h itself).
If you feel motivated, you might want to try to experiment. Start by
trying to compile more than math.h in the test (and maybe include some
actual c++ code?)
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