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cmd/cgo: document //export preamble restriction

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Fixes #3497.

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/7235075
This commit is contained in:
Russ Cox 2013-02-01 08:33:52 -08:00
parent 25d1fc9389
commit ed9fc7531d
1 changed files with 5 additions and 0 deletions
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5
src/cmd/cgo/doc.go
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@ -116,6 +116,11 @@ copied from the cgo input files. Functions with multiple
return values are mapped to functions returning a struct. return values are mapped to functions returning a struct.
Not all Go types can be mapped to C types in a useful way. 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 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. files, a C file for 6c (or 8c or 5c), and a C file for gcc.