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Matthew Dempsky a295d59d10 cmd/cgo: prevent redeclaration of _Ctype_void when C.void is used
CL 230037 changed cmd/cgo to emit "type _Ctype_foo = bar" aliases for
all C.foo types mentioned in the original Go source files. However,
cmd/cgo already emits an appropriate type definition for _Ctype_void.
So if a source file explicitly mentions C.void, this resulted in
_Ctype_void being declared multiple times.

This CL fixes the issue by suppressing the "type _Ctype_void =
_Ctype_void" alias before printing it. This should be safe because
_Ctype_void is the only type that's specially emitted in out.go at the
moment.

A somewhat better fix might be to fix how _Ctype_void is declared in
the cmd/cgo "frontend", but this is a less invasive fix.

Fixes #39877.

Change-Id: Ief264b3847c8ef8df1478a6333647ff2cf09b63d
Reviewed-on: https://go-review.googlesource.com/c/go/+/240180
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2020-06-26 19:00:25 +00:00
.github .github: add link to questions in ISSUE_TEMPLATE 2020-01-06 17:05:31 +00:00
api go/types: rename UsesCgo to go115UsesCgo 2020-06-10 21:39:03 +00:00
doc doc/go1.15: fix typos and wording in a few places 2020-06-26 18:47:38 +00:00
lib/time lib/time, time/tzdata: update tz data to 2020a 2020-04-30 08:07:39 +00:00
misc cmd/cgo: prevent redeclaration of _Ctype_void when C.void is used 2020-06-26 19:00:25 +00:00
src cmd/cgo: prevent redeclaration of _Ctype_void when C.void is used 2020-06-26 19:00:25 +00:00
test cmd/compile: remove check that Zero's arg has the correct base type 2020-06-25 15:59:48 +00:00
.gitattributes all: treat all files as binary, but check in .bat with CRLF 2020-06-08 15:31:43 +00:00
.gitignore .gitignore: ignore src/cmd/dist/dist 2017-10-28 21:55:49 +00:00
AUTHORS A+C: add Nikita Gillmann (individual CLA) 2020-06-15 17:29:18 +00:00
CONTRIBUTING.md all: restore changes from faulty merge/revert 2018-02-12 20:13:59 +00:00
CONTRIBUTORS A+C: add Nikita Gillmann (individual CLA) 2020-06-15 17:29:18 +00:00
favicon.ico website: recreate 16px and 32px favicon 2016-08-25 15:43:32 +00:00
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README.md README: linkify some paths 2018-06-06 18:07:01 +00:00
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SECURITY.md SECURITY.md: update go versions 2019-09-26 15:34:57 +00:00

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