Re: [go-nuts] how to link cgo libraries in go1.9.4 ?
On Saturday, February 10, 2018 at 2:18:23 AM UTC+7, andrey mirtchovski wrote: > > If you mix dynamic libraries with static ones in the same folder the > -L -l trick won't work. a workaround is to softlink the .a files to a > separate folder so that the linker doesn't see the .so/.dylib files. > I found that while -L -l may *appear* to work, the linker may have actually found a library with a similar -l name in a system path (e.g. /usr/local/lib) and decided to dynamically link against that version instead of the required one in the -L path. This may result in build success but runtime failure. -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [go-nuts] how to link cgo libraries in go1.9.4 ?
If you mix dynamic libraries with static ones in the same folder the -L -l trick won't work. a workaround is to softlink the .a files to a separate folder so that the linker doesn't see the .so/.dylib files. On Fri, Feb 9, 2018 at 12:11 PM, Jason E. Aten wrote: >> Note that the _ALLOW environment variables hold a regular expression, >> so you could also write CGO_LDFLAGS_ALLOW='.*\.a'. > > > Thank you, Ian. That's much more palatable. > > -- > You received this message because you are subscribed to the Google Groups > "golang-nuts" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to golang-nuts+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [go-nuts] how to link cgo libraries in go1.9.4 ?
> > Note that the _ALLOW environment variables hold a regular expression, > so you could also write CGO_LDFLAGS_ALLOW='.*\.a'. > Thank you, Ian. That's much more palatable. -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [go-nuts] how to link cgo libraries in go1.9.4 ?
On Fri, Feb 9, 2018 at 10:05 AM, Jason E. Aten wrote:
> Yay. I found a workaround--or rather, finally understood one of the
> suggestions.
>
> Adding the following CGO_LDFLAGS_ALLOW hack in the Makefiles allows linking
> against the named .a file.
>
> export
> CGO_LDFLAGS_ALLOW="${GOPATH}/src/github.com/gijit/gi/vendor/github.com/glycerine/golua/lua/../../../LuaJIT/LuaJIT/src/libluajit.a";
Note that the _ALLOW environment variables hold a regular expression,
so you could also write CGO_LDFLAGS_ALLOW='.*\.a'.
Ian
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Re: [go-nuts] how to link cgo libraries in go1.9.4 ?
Yay. I found a workaround--or rather, finally understood one of the
suggestions.
Adding the following CGO_LDFLAGS_ALLOW hack in the Makefiles allows linking
against the named .a file.
export
CGO_LDFLAGS_ALLOW="${GOPATH}/src/github.com/gijit/gi/vendor/github.com/glycerine/golua/lua/../../../LuaJIT/LuaJIT/src/libluajit.a";
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Re: [go-nuts] how to link cgo libraries in go1.9.4 ?
I added comments on #23749, but sadly the -L -l suggested workaround just makes a bad situation worse. It converts a linktime error into a runtime error. Details in the 23749 comment. It appears that this CL, that adds the forgotten support for linking against .a files, is what is needed: https://go-review.googlesource.com/c/go/+/92855/1/src/cmd/go/internal/work/security.go But it appears that team is delaying a fix in order to collect a more complete list of flags that should be whitelisted. So for now, it appears that certain CGO projects may well just have to declare go1.9.4 an unsupportable release. -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [go-nuts] how to link cgo libraries in go1.9.4 ?
Please add your comments to this issue:
https://github.com/golang/go/issues/23749 There are already a couple
of reports for that particular usage pattern, one of which is mine.
For now you have the option to do:
#cgo LDFLAGS: -L${SRCDIR}/../../../LuaJIT/LuaJIT/src -lluajit -lm -ldl
There are other options discussed in that thread.
On Fri, Feb 9, 2018 at 9:11 AM, Jason E. Aten wrote:
> on OSX, with the newly minted go1.9.4 with its cgo flag restrictions, I am
> telling the linker what libraries to link against: (here
> https://github.com/gijit/gi/blob/master/vendor/github.com/glycerine/golua/lua/lua.go#L10
> )
>
> ~~~
> #cgo LDFLAGS: ${SRCDIR}/../../../LuaJIT/LuaJIT/src/libluajit.a -lm -ldl
> ~~~
>
> produces on attempt to build:
>
> ~~~
> make build
> go build -ldflags "-X
> main.LastGitCommitHash=30259813c10c0f6b63768b4f35358828e2e29f0b -X
> main.BuildTimeStamp=2018-02-09T22:49:48+0700 -X main.GitBranch=master -X
> main.NearestGitTag=v0.9.6 -X
> main.GoVersion=go_version_go1.9.4_darwin/amd64" -o gi
> go build github.com/gijit/gi/vendor/github.com/glycerine/golua/lua: invalid
> flag in #cgo LDFLAGS:
> /Users/jaten/go/src/github.com/gijit/gi/vendor/github.com/glycerine/golua/lua/../../../LuaJIT/LuaJIT/src/libluajit.a
> make[2]: *** [build] Error 1
> make[1]: *** [install] Error 2
> make: *** [install] Error 2
> jaten@jatens-MacBook-Pro ~/go/src/github.com/gijit/gi (master) $
> ~~~
>
> So how do I tell cgo to link against these libraries in 1.9.4?
>
> Going down the path of crazy, I tried setting
> CGO_CFLAGS_ALLOW="$(GOPATH)/github.com/gijit/gi/vendor/github.com/glycerine/golua/lua/../../../LuaJIT/LuaJIT/src/libluajit.a",
> but even so I still get:
> ~~~
> go build -ldflags "-X
> main.LastGitCommitHash=30259813c10c0f6b63768b4f35358828e2e29f0b -X
> main.BuildTimeStamp=2018-02-09T23:08:10+0700 -X main.GitBranch=master -X
> main.NearestGitTag=v0.9.6 -X
> main.GoVersion=go_version_go1.9.4_darwin/amd64" -o gi
> go build github.com/gijit/gi/vendor/github.com/glycerine/golua/lua: invalid
> flag in #cgo LDFLAGS:
> /Users/jaten/go/src/github.com/gijit/gi/vendor/github.com/glycerine/golua/lua/../../../LuaJIT/LuaJIT/src/libluajit.a
> make[2]: *** [build] Error 1
> make[1]: *** [install] Error 2
> make: *** [minimal] Error 2
> jaten@jatens-MacBook-Pro ~/go/src/github.com/gijit/gi (master) $
> ~~~
>
> --
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[go-nuts] how to link cgo libraries in go1.9.4 ?
on OSX, with the newly minted go1.9.4 with its cgo flag restrictions, I am
telling the linker what libraries to link against: (here
https://github.com/gijit/gi/blob/master/vendor/github.com/glycerine/golua/lua/lua.go#L10
)
~~~
#cgo LDFLAGS: ${SRCDIR}/../../../LuaJIT/LuaJIT/src/libluajit.a -lm -ldl
~~~
produces on attempt to build:
~~~
make build
go build -ldflags "-X
main.LastGitCommitHash=30259813c10c0f6b63768b4f35358828e2e29f0b -X
main.BuildTimeStamp=2018-02-09T22:49:48+0700 -X main.GitBranch=master -X
main.NearestGitTag=v0.9.6 -X
main.GoVersion=go_version_go1.9.4_darwin/amd64" -o gi
go build github.com/gijit/gi/vendor/github.com/glycerine/golua/lua: invalid
flag in #cgo LDFLAGS:
/Users/jaten/go/src/github.com/gijit/gi/vendor/github.com/glycerine/golua/lua/../../../LuaJIT/LuaJIT/src/libluajit.a
make[2]: *** [build] Error 1
make[1]: *** [install] Error 2
make: *** [install] Error 2
jaten@jatens-MacBook-Pro ~/go/src/github.com/gijit/gi (master) $
~~~
So how do I tell cgo to link against these libraries in 1.9.4?
Going down the path of crazy, I tried setting
CGO_CFLAGS_ALLOW="$(GOPATH)/github.com/gijit/gi/vendor/github.com/glycerine/golua/lua/../../../LuaJIT/LuaJIT/src/libluajit.a",
but even so I still get:
~~~
go build -ldflags "-X
main.LastGitCommitHash=30259813c10c0f6b63768b4f35358828e2e29f0b -X
main.BuildTimeStamp=2018-02-09T23:08:10+0700 -X main.GitBranch=master -X
main.NearestGitTag=v0.9.6 -X
main.GoVersion=go_version_go1.9.4_darwin/amd64" -o gi
go build github.com/gijit/gi/vendor/github.com/glycerine/golua/lua: invalid
flag in #cgo LDFLAGS:
/Users/jaten/go/src/github.com/gijit/gi/vendor/github.com/glycerine/golua/lua/../../../LuaJIT/LuaJIT/src/libluajit.a
make[2]: *** [build] Error 1
make[1]: *** [install] Error 2
make: *** [minimal] Error 2
jaten@jatens-MacBook-Pro ~/go/src/github.com/gijit/gi (master) $
~~~
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