See: http://gcc.gnu.org/ml/libstdc++/2007-09/msg00089.html
Some of the older cruft (-j1 mandated) has been removed from the libstdc++ Makefiles, but the older problem remains. "This is because there is basically one large call to runtest, which then runs on one processor. And I have not found any way to convince runtest to run its test cases in parallel." This could also be categorized as testsuite. -- Summary: make check -jN should fully use N cores Product: gcc Version: 4.3.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: libstdc++ AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: bkoz at gcc dot gnu dot org GCC build triplet: all GCC host triplet: all GCC target triplet: all http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33612