cmd/cgo: clang doesn't support no-eliminate-unused-debug-types after upgrade XCode to 5.0 version

[gopherbot]

by sunikbear:

This is the bug:
https://groups.google.com/forum/#!msg/golang-dev/H3FCUAlc6BU/wTkBMpPzrm0J

I encounter this problem after upgrade my XCode to 5.0 version while using CGO:
https://github.com/qiniu/iconv

clang: error: argument unused during compilation: '-fno-eliminate-unused-debug-types'

[gopherbot]

Comment 1 by sunikbear:

Referencw: http://llvm.org/bugs/show_bug.cgi?id=11710

[gopherbot]

Comment 2 by sunikbear:

Reference: http://llvm.org/bugs/show_bug.cgi?id=11710

[ianlancetaylor]

Comment 3:

Which version of go are you using?

[gopherbot]

Comment 4 by sunikbear:

go 1.1.2

[ianlancetaylor]

Comment 5:

Can you test if this still fails with tip or a Go 1.2 release candidate?

[gopherbot]

Comment 6 by sunikbear:

I don't know how to test as you said. Can you tell me how not to use this compile option
in clang? -fno-eliminate-unused-debug-types

[ianlancetaylor]

Comment 7:

You can download a 1.2 release candidate from
https://code.google.com/p/go/downloads/list .
You can eliminate the option by editing the file src/cmd/cgo/gcc.go and removing the
option from the list of options--just search for it.  But if you can tell us whether
this works with 1.2 we will be able to improve the 1.2 release.  Thanks.

[gopherbot]

Comment 8 by sunikbear:

Thanks very much.

[ianlancetaylor]

Comment 9:

As far as I know this is fixed in 1.2.  Please reopen if not.

Status changed to Fixed.

[gopherbot]

Comment 10 by rustf3:

Confirmed happens in go1.1.2 darwin/amd64 and fixed by go1.2rc1.darwin-amd64-osx10.8.pkg.

[ianlancetaylor]

Comment 11:

Issue #6663 has been merged into this issue.

[gopherbot]

Comment 12 by jeidsath:

Was there a regression before release? I see this issue with the latest
go1.2.darwin-amd64-osx10.8.pkg from https://code.google.com/p/go/downloads/list
(uploaded Dec 1). It's also an issue for me on the version of Go install by Go Brew.
joel@freyr:~/src/cgotest$ /usr/local/go/bin/go run random.go
# command-line-arguments
clang: error: argument unused during compilation: '-fno-eliminate-unused-debug-types'

[gopherbot]

Comment 13 by jeidsath:

That is, "installed by Homebrew"

[ianlancetaylor]

Comment 14:

If you have a problem when using the current sources, please don't comment on a closed
issue.  Please open a new issue instead.  Thanks.
Go 1.2 never passes -fno-eliminate-unused-debug-types to any compiler, so it is very
unlikely that you would be seeing that warning when using Go 1.2.  But if you somehow
are: open a new issue.