http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53880
Bug #: 53880 Summary: [4.8 Regression] compile time regression when generating precompiled headers for boost Classification: Unclassified Product: gcc Version: 4.8.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: pch AssignedTo: unassig...@gcc.gnu.org ReportedBy: mar...@trippelsdorf.de There is a huge compile time regression in 4.8 when one generates a precompiled header for boost's /math/special_functions.hpp. gcc-4.7: % time c++ -c -o pch.hpp.gch /usr/include/boost/math/special_functions.hpp c++ -c -o pch.hpp.gch /usr/include/boost/math/special_functions.hpp 2.26s user 0.13s system 99% cpu 2.407 total gcc-4.8: % time c++ -c -o pch.hpp.gch /usr/include/boost/math/special_functions.hpp c++ -c -o pch.hpp.gch /usr/include/boost/math/special_functions.hpp 172.42s user 0.37s system 99% cpu 2:53.44 total