On Thu, Sep 27, 2018 at 5:34 PM, <amand...@cohesity.com> wrote:
> Yes, this works for a simple program I have. Now I modified the helloworld
> to use glog as follows:
>
> package main
>
> import (
> "fmt"
> "github.com/golang/glog"
> )
>
> func main() {
> fmt.Println("Hello world....")
> glog.Info("Hello world...")
> }
>
> But now I get another error from libglog.a:
>
> amandeep@s113ldom1:~/workspace$ go build -gccgoflags=-m64 helloworld.go
> # command-line-arguments
> ld: warning: file
> /opt/go_pkgs/pkg/gccgo_solaris_sparc/github.com/golang/libglog.a(_go_.o):
> wrong ELF class: ELFCLASS32
> Undefined first referenced
> symbol in file
> github_com_golang_glog..import $WORK/b001/_pkg_.a(_go_.o)
> github_com_golang_glog.Info $WORK/b001/_pkg_.a(_go_.o)
> ld: fatal: symbol referencing errors
> collect2: error: ld returned 1 exit status
>
> So, I thought recompiling glog with 64 bit option would help. None of the
> following helped:
>
> sudo GOPATH=/opt/go_pkgs/ CGO_LDFLAGS='-m64' go install
> sudo GOPATH=/opt/go_pkgs/ go install -gccgoflags '-m64'
> sudo GOPATH=/opt/go_pkgs/ go install -gccgoflags='-m64'
>
> All of these generate the following:
>
> amandeep@s113ldom1:/opt/go_pkgs/src/github.com/golang/glog$ file
> /opt/go_pkgs/pkg/gccgo_solaris_sparc/github.com/golang/libglog.a
> /opt/go_pkgs/pkg/gccgo_solaris_sparc/github.com/golang/libglog.a:
> current ar archive, 32-bit symbol table
For a package that uses cgo, you'll need to use -gccgoflags=-m64 and
also set both CGO_CFLAGS and CGO_LDFLAGS to -m64.
Ian
> On Thursday, September 27, 2018 at 3:01:12 PM UTC-7, Ian Lance Taylor wrote:
>>
>> On Thu, Sep 27, 2018 at 2:57 PM, Amandeep Gautam
>> <amandee...@gmail.com> wrote:
>> > Hi,
>> > I am trying to compile a 64bit executable using gccgo on Solaris
>> > 11/10.
>> > Following is what I have tried:
>> >
>> > CGO_LDFLAGS='-m64' go build hello_world.go
>> > GOARCH=sparc64 CGO_LDFLAGS='-m64' go build hello_world.go
>> >
>> > Below is the output of the first command:
>> >
>> > amandeep@s113ldom1:~/workspace$ CGO_LDFLAGS='-m64' go build pqrs.go
>> > # command-line-arguments
>> > ld: warning: file $WORK/b001/_pkg_.a(_go_.o): wrong ELF class:
>> > ELFCLASS32
>> > Undefined first referenced
>> > symbol in file
>> > main.main
>> > /usr/gnu/lib/gcc/sparc-sun-solaris2.11/8.2.1/../../../sparcv9/libgo.so
>> > __go_init_main
>> > /usr/gnu/lib/gcc/sparc-sun-solaris2.11/8.2.1/../../../sparcv9/libgo.so
>> > ld: fatal: symbol referencing errors
>> > collect2: error: ld returned 1 exit status
>> >
>> > However, I am able to generate 64 bit executable for c++ helloworld
>> > using
>> > just gcc, so I am hoping it boils down to passing the right set of
>> > flags.
>> > For example:
>> >
>> > amandeep@s113ldom1:~/workspace$ /usr/gnu/bin/gcc -m64 helloworld.c
>> > amandeep@s113ldom1:~/workspace$ file ./a.out
>> > ./a.out: ELF 64-bit MSB executable SPARCV9 Version 1, dynamically
>> > linked, not stripped, no debugging information available
>> > amandeep@s113ldom1:~/workspace$ file /usr/gnu/bin/gcc
>> > /usr/gnu/bin/gcc: ELF 32-bit MSB executable SPARC32PLUS Version 1,
>> > V8+
>> > Required, dynamically linked, not stripped
>> >
>> > How would you compile a 64 bit executable for Solaris using gccgo?
>>
>> CGO_LDFLAGS only affects your program if it actually uses cgo.
>>
>> Does it work to do
>> go build -gccgoflags=-m64
>> ?
>
>
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