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Russ Cox authored
The preamble may want to #define some special symbols and then #include <sys/types.h> itself. The builtin prolog also #includes <sys/types.h>, which would break such a preamble (because the second #include will be a no-op). The use of sys/types.h in the builtin prolog is new since Go 1.1, so this should preserve the semantics of more existing cgo code than we would otherwise. It also fixes src/pkg/syscall/mkall.sh's use of go tool cgo -godefs on some Linux systems. Thanks to fullung@ for identifying the problem. Fixes #6558. R=golang-dev, iant CC=golang-dev https://golang.org/cl/14684044
5feb1550
