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the vanilla versions might not handle all things, that gcc can do;
For example is lto not really supported by the vanilla versions
source:
https://gcc.gnu.org/wiki/LinkTimeOptimizationFAQ
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This fixes building cmake and other ports which use cmake
to detect whether we have -ldl.
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This enables building usermode programs with exception handling. It also
builds a libstdc++ without exception support for the kernel.
This is necessary because the libstdc++ that gets built is different
when exceptions are enabled. Using the same library binary would
require extensive stubs for exception-related functionality in the
kernel.
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We don't have libdl (yet) so update the CMAKE_DL_LIBRARY
definition to match.
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This also ensures that pkg-config finds packages in /usr/local
and changes the install prefix to /usr/local.
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