Commit ed9fc753 authored by Russ Cox's avatar Russ Cox

cmd/cgo: document //export preamble restriction

Fixes #3497.

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/7235075
parent 25d1fc93
......@@ -116,6 +116,11 @@ copied from the cgo input files. Functions with multiple
return values are mapped to functions returning a struct.
Not all Go types can be mapped to C types in a useful way.
Using //export in a file places a restriction on the preamble:
since it is copied into two different C output files, it must not
contain any definitions, only declarations. Definitions must be
placed in preambles in other files, or in C source files.
Cgo transforms the input file into four output files: two Go source
files, a C file for 6c (or 8c or 5c), and a C file for gcc.
......
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