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Introduce an abstraction layer for reporting diagnostics, so as to avoid
directly using the native GCC interfaces such as "error_at",
"warning_at", "open_quote", "close_quote", etc. The new interfaces have
the same look and feel as the GCC equivalents, but make calls into
back-end functions to allow the back end to select the proper final
reporting routine.
Reviewed-on: https://go-review.googlesource.com/29191
* go-gcc-diagnostics.cc: New file.
* go-location.h (Location): Remove operator source_location. Add
operator==.
* go-system.h: #include <sstream>.
* Make-lang.in (GO_OBJS): Add go/go-diagnostics.o and
go/go-gcc-diagnostics.o.
(CFLAGS-go/go-gcc-diagnostics.o): New variable.
From-SVN: r240453
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