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cmd/cgo: duplicate symbol #3116

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gopherbot opened this issue Feb 23, 2012 · 4 comments

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@gopherbot
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commented Feb 23, 2012

by giacomo.tartari:

What steps will reproduce the problem?
I don't have an ad hoc example but I stumbled upon the issue while go getting a githhub
repo so the code is there. 
1.
$ go get github.com/jteeuwen/glfw


What is the expected output?

$

What do you see instead?

# github.com/jteeuwen/glfw
ld: duplicate symbol _setCharCB in $WORK/github.com/jteeuwen/glfw/_obj/glfw.cgo2.o and
$WORK/github.com/jteeuwen/glfw/_obj/_cgo_export.o for architecture x86_64
collect2: ld returned 1 exit status

Which compiler are you using (5g, 6g, 8g, gccgo)?
6g

Which operating system are you using?

$ uname -rs
Darwin 11.3.0

Which revision are you using?  (hg identify)

$ hg identify
96bd78e7d35e weekly/weekly.2012-02-22

$ go version
go version weekly.2012-02-22 +96bd78e7d35e

Please provide any additional information below.

more details here:
https://groups.google.com/d/msg/golang-nuts/_HKIFbWX0Co/dwASE-SGPXIJ
@rsc

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commented Feb 23, 2012

Comment 1:

What is setCharCB (or _setCharCB?)  I don't see it defined in glue.h,
but the bug must becaused by including glue.h in _cgo_export.h now
(this is new behavior).

Labels changed: added priority-go1, removed priority-triage.

Owner changed to builder@golang.org.

Status changed to Accepted.

@gopherbot

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commented Feb 23, 2012

Comment 2 by jimteeuwen:

'setCharCB' is defined in line 25 of
https://github.com/jteeuwen/glfw/blob/master/callback.go as:
    // void setCharCB() { glfwSetCharCallback(goCharCB); }
and only called from line 195 in the same file as:
    C.setCharCB()
Where the linker gets the underscored version from is unknown to me.
@rsc

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commented Feb 23, 2012

Comment 3:

Thanks for tracking that down.  That kind of definition
is no longer supported in cgo packages that use //export.
You should talk to the owner of that code to get it updated.
The change is documented in "The cgo command" section
here: http://weekly.golang.org/doc/go1.html#cmd_cgo
Russ

Status changed to WorkingAsIntended.

@gopherbot

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commented Feb 23, 2012

Comment 4 by giacomo.tartari:

Thanks Russ and sorry for the noise.
Note to self: RTM.

@rsc rsc added this to the Go1 milestone Apr 10, 2015

@rsc rsc removed the priority-go1 label Apr 10, 2015

@golang golang locked and limited conversation to collaborators Jun 24, 2016

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