While policy based associative containers did not exist in GCC 4.0, the libstdc++/include/Makefile.am to install the header files during the libstdc++ build and install phases causes failures on AIX. The list of pb_assoc files and the way it is used in the Makefile causes Make to generate a command that exceeds a system execvp limit.
-- Summary: [4.0 Regression] pb_assoc header build and install overflows exec Product: gcc Version: 4.1.0 Status: UNCONFIRMED Severity: normal Priority: P2 Component: libstdc++ AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: dje at gcc dot gnu dot org CC: gcc-bugs at gcc dot gnu dot org GCC build triplet: powerpc-ibm-aix GCC host triplet: powerpc-ibm-aix GCC target triplet: powerpc-ibm-aix http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22554