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doc: clarify duplicate symbol condition in cgo

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Spell out what will happen if a declaration and definition is included
in the same file, should help people who run into duplicate symbol
errors and search for relevant keywords.

This edit is based on opening issue #11263 erroneously.

Change-Id: I0645a9433b8668d2ede9b9a3f6550d802c26388b
Reviewed-on: https://go-review.googlesource.com/11247
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Andrey Petrov 2015-06-18 21:43:01 +02:00 committed by Ian Lance Taylor
parent 2f3d103f55
commit 9f3a2d5f9a
1 changed files with 4 additions and 2 deletions
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6
src/cmd/cgo/doc.go
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@ -207,8 +207,10 @@ 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.
contain any definitions, only declarations. If a file contains both
definitions and declarations, then the two output files will produce
duplicate symbols and the linker will fail. To avoid this, definitions
must be placed in preambles in other files, or in C source files.
Using cgo directly