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Welp. It looks like the reason for c++/28871 is that anonymous namespace usage in libstdc++ headers was making PCH files unusable. This, despite -Winvalid-pch not telling me this... This, despite -H showing the pch used... UGH!!!!! I only found this by using --disable-libstdcxx-pch and noticing that my test times improved by 20 minutes. With this patch in, test times for libstdc++ are now back to late july levels. (ie, 23 minutes vs. 57 minutes to 64 minutes on my laptop.) I thought there was a bugzilla about this issue (which impacts boost, or used to), but I cannot find it at the moment. :( -benjamin
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