Actually, I now understand what you meant. And even that does not work:

amandeep@s113ldom1:/opt/go_pkgs/src/github.com/golang/glog$ sudo 
GOPATH=/opt/go_pkgs CC='/home/amandeep/workspace/mygcc.sh' 
CGO_CFLAGS='-m64' CGO_LDFLAGS='-m64' GOARCH=sparc64 CGO_ENABLED=1 go 
install -x -gccgoflags=-m64
WORK=/tmp/go-build445938530
mkdir -p $WORK/b001/
cd $WORK
/usr/gnu/bin/gccgo -fgo-importcfg=/dev/null -c -x c - || true
cd /opt/go_pkgs/src/github.com/golang/glog
/usr/gnu/bin/gccgo -c -g -fdebug-prefix-map=$WORK=/tmp/go-build 
-gno-record-gcc-switches -fgo-pkgpath=github.com/golang/glog -o 
$WORK/b001/_go_.o -I $WORK/b001/_importcfgroot_ -m64 ./glog.go 
./glog_file.go
echo '  .section .go.buildid,"e"' >> $WORK/b001/_buildid.s
echo '  .byte 0x79,0x71,0x58,0x37,0x74,0x64,0x76,0x6c' >> 
$WORK/b001/_buildid.s
echo '  .byte 0x7a,0x59,0x53,0x39,0x41,0x6a,0x30,0x58' >> 
$WORK/b001/_buildid.s
echo '  .byte 0x34,0x53,0x78,0x39,0x2f,0x79,0x71,0x58' >> 
$WORK/b001/_buildid.s
echo '  .byte 0x37,0x74,0x64,0x76,0x6c,0x7a,0x59,0x53' >> 
$WORK/b001/_buildid.s
echo '  .byte 0x39,0x41,0x6a,0x30,0x58,0x34,0x53,0x78' >> 
$WORK/b001/_buildid.s
echo '  .byte 0x39' >> $WORK/b001/_buildid.s
echo '' >> $WORK/b001/_buildid.s
/usr/gnu/bin/gccgo -xassembler-with-cpp -I $WORK/b001/ -c -o 
$WORK/b001/_buildid.o -D GOOS_solaris -D GOARCH_sparc64 -D 
GOPKGPATH=github_com_golang_glog $WORK/b001/_buildid.s
ar rcD $WORK/b001/_pkg_.a $WORK/b001/_go_.o $WORK/b001/_buildid.o
/usr/gnu/libexec/gcc/sparc-sun-solaris2.11/8.2.1/buildid -w 
$WORK/b001/_pkg_.a # internal
cp $WORK/b001/_pkg_.a 
/root/.cache/go-build/a4/a47820a6bcb6e72c26a3be36129e80b12a0f0193dd5959e2c7304a3b169d9af8-d
 
# internal
mkdir -p /opt/go_pkgs/pkg/gccgo_solaris_sparc64/github.com/golang/
cp $WORK/b001/_pkg_.a 
/opt/go_pkgs/pkg/gccgo_solaris_sparc64/github.com/golang/libglog.a
rm -r $WORK/b001/
amandeep@s113ldom1:/opt/go_pkgs/src/github.com/golang/glog$ ls -al 
/opt/go_pkgs/pkg/gccgo_solaris_sparc64/github.com/golang/libglog.a
-rw-r--r-- 1 root root 611582 Sep 28 08:52 
/opt/go_pkgs/pkg/gccgo_solaris_sparc64/github.com/golang/libglog.a
amandeep@s113ldom1:/opt/go_pkgs/src/github.com/golang/glog$ file 
/opt/go_pkgs/pkg/gccgo_solaris_sparc64/github.com/golang/libglog.a
/opt/go_pkgs/pkg/gccgo_solaris_sparc64/github.com/golang/libglog.a:    
 current ar archive, 32-bit symbol table

The CC flag is not even honoured it would seem as I do not see any 
invocation related to mygcc.sh. Please advice.

On Friday, September 28, 2018 at 3:23:43 PM UTC-7, aman...@cohesity.com 
wrote:
>
> hmm...filed a bug here: https://github.com/golang/go/issues/27929
>
> Could you explain the workaround for this again? I did not understand the 
> fallback option.
>
> Apart from that, I tried to run each command manually to force m64 option 
> whenever possible. I was able to get a 64 bit executable for _buildid.o but 
> even after that running ar rcD $WORK/b001/_pkg_.a $WORK/b001/_go_.o 
> $WORK/b001/_buildid.o produces a 32-bit archive. Also, running 
> buildid gives some error about 32 byte hash. Please see:
>
> amandeep@s113ldom1:~/workspace$ 
> /usr/gnu/libexec/gcc/sparc-sun-solaris2.11/8.2.1/buildid -w 
> $WORK/b001/_pkg_.a
> buildid: /tmp/go-build365019570/b001/_pkg_.a: cannot find 32-byte hash in 
> id yqX7tdvlzYS9Aj0X4Sx9/yqX7tdvlzYS9Aj0X4Sx9
>
> Let me know if any of this needs to be reported in the bug or if it 
> provides more clarity on my situation here.
>
> On Friday, September 28, 2018 at 1:02:06 PM UTC-7, Ian Lance Taylor wrote:
>>
>> On Fri, Sep 28, 2018 at 10:14 AM,  <aman...@cohesity.com> wrote: 
>> > nopes...doesn't work either. I tried both variations...with and without 
>> > GOARCH=sparc64 flag. Following is the output with sparc64 flag: 
>> > 
>> > amandeep@s113ldom1:/opt/go_pkgs/src/github.com/golang/glog$ sudo 
>> > GOPATH=/opt/go_pkgs  CC='gcc -m64' CGO_CFLAGS='-m64' CGO_LDFLAGS='-m64' 
>> > GOARCH=sparc64 CGO_ENABLED=1 go install -x -gccgoflags=-m64 
>> > WORK=/tmp/go-build365019570 
>> > mkdir -p $WORK/b001/ 
>> > cd $WORK 
>> > /usr/gnu/bin/gccgo -fgo-importcfg=/dev/null -c -x c - || true 
>> > cd /opt/go_pkgs/src/github.com/golang/glog 
>> > /usr/gnu/bin/gccgo -c -g -fdebug-prefix-map=$WORK=/tmp/go-build 
>> > -gno-record-gcc-switches -fgo-pkgpath=github.com/golang/glog -o 
>> > $WORK/b001/_go_.o -I $WORK/b001/_importcfgroot_ -m64 ./glog.go 
>> > ./glog_file.go 
>> > echo '  .section .go.buildid,"e"' >> $WORK/b001/_buildid.s 
>> > echo '  .byte 0x79,0x71,0x58,0x37,0x74,0x64,0x76,0x6c' >> 
>> > $WORK/b001/_buildid.s 
>> > echo '  .byte 0x7a,0x59,0x53,0x39,0x41,0x6a,0x30,0x58' >> 
>> > $WORK/b001/_buildid.s 
>> > echo '  .byte 0x34,0x53,0x78,0x39,0x2f,0x79,0x71,0x58' >> 
>> > $WORK/b001/_buildid.s 
>> > echo '  .byte 0x37,0x74,0x64,0x76,0x6c,0x7a,0x59,0x53' >> 
>> > $WORK/b001/_buildid.s 
>> > echo '  .byte 0x39,0x41,0x6a,0x30,0x58,0x34,0x53,0x78' >> 
>> > $WORK/b001/_buildid.s 
>> > echo '  .byte 0x39' >> $WORK/b001/_buildid.s 
>> > echo '' >> $WORK/b001/_buildid.s 
>> > /usr/gnu/bin/gccgo -xassembler-with-cpp -I $WORK/b001/ -c -o 
>> > $WORK/b001/_buildid.o -D GOOS_solaris -D GOARCH_sparc64 -D 
>> > GOPKGPATH=github_com_golang_glog $WORK/b001/_buildid.s 
>> > ar rcD $WORK/b001/_pkg_.a $WORK/b001/_go_.o $WORK/b001/_buildid.o 
>> > /usr/gnu/libexec/gcc/sparc-sun-solaris2.11/8.2.1/buildid -w 
>> > $WORK/b001/_pkg_.a # internal 
>> > cp $WORK/b001/_pkg_.a 
>> > 
>> /root/.cache/go-build/a4/a47820a6bcb6e72c26a3be36129e80b12a0f0193dd5959e2c7304a3b169d9af8-d
>>  
>>
>> > # internal 
>> > mkdir -p /opt/go_pkgs/pkg/gccgo_solaris_sparc64/github.com/golang/ 
>> > cp $WORK/b001/_pkg_.a 
>> > /opt/go_pkgs/pkg/gccgo_solaris_sparc64/github.com/golang/libglog.a 
>> > rm -r $WORK/b001/ 
>> > amandeep@s113ldom1:/opt/go_pkgs/src/github.com/golang/glog$ file 
>> > /opt/go_pkgs/pkg/gccgo_solaris_sparc64/github.com/golang/libglog.a 
>> > /opt/go_pkgs/pkg/gccgo_solaris_sparc64/github.com/golang/libglog.a: 
>> > current ar archive, 32-bit symbol table 
>> > 
>> > 
>> > I think the problem is with the text in red. It gets the sparc64 flag, 
>> but 
>> > the executable is still having 32-bit MSB relocatable SPARC 
>> > Let me know if you have any other suggestions. 
>>
>> This sounds like a bug.  I encourage you to file it at 
>> https://golang.org/issue/new . 
>>
>> There is always the fallback of using a shell script mygcc 
>>
>> #!/bin/sh 
>> exec gcc -m64 $* 
>>
>> and setting CC=/path/to/mygcc 
>>
>> Ian 
>>
>

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