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build: define getcallerpc in u.h (fix for Plan 9 build)
. By defining getcallerpc(x) as __builtin_return_address(0) here, it becomes possible to use the Plan 9 compatible form when compiling using GCC. The alternative is to add conditional compilation based on the compiler identity in "cmd/8g/gsubr.c" to distinguish between the two cases. R=golang-dev CC=golang-dev, rsc https://golang.org/cl/4800048
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@ -194,6 +194,8 @@ typedef u64int uint64;
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#undef _NEEDUINT
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#undef _NEEDULONG
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#define getcallerpc(x) __builtin_return_address(0)
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#ifndef SIGBUS
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#define SIGBUS SIGSEGV /* close enough */
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#endif
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