[oe] openjdk-7 and gcc v5

[Bruce, Henry]

On Thu, 2015-10-29 at 17:43 -0700, Khem Raj wrote:
> On Thu, Oct 29, 2015 at 4:00 PM, Bruce, Henry <henry.bruce at intel.com>
> wrote:
> > Many thanks to contributors who fixed openjdk build issues
> > introduced by gcc v5 and for maintainers for pushing the updates.
> > However one problem remains: openjdk build fails in
> > openjdk/jdk/make/java/nio due to -static compiler flag being used
> > in conjunction with -pthread giving error
> > /usr/bin/ld: cannot find -lpthread
> > /usr/bin/ld: cannot find -lc
> > 
> 
> its not clear how the -static flag can cause this. may be its using 
> CC for LD or wise versa ?

Not clear to me either, but if you create a simple file, say test.c

int main()
{
  return 0;
}

and compile with gcc test.c -pthread -static
it fails as follows with gcc v5 
/usr/bin/ld: cannot find -lpthread
/usr/bin/ld: cannot find -lc

but compiles OK with earlier versions of gcc.

> 
> > I fixed this by removing -static flag from Makefile. Not sure of
> > this was the right thing to do (so I didn't submit patch) but it
> > worked for me.
> > I added the following to the an openjdk bbappend and it fixed the
> > build and resulting jre is running OK.
> > 
> > do_configure_append() {
> >         gcc -v 2>&1 | grep 5\..
> >         if [ "$?" == "0" ]; then
> 
> why this check for gcc ?

It only fails with gcc v5, so if it's not broken, don't fix it...

> 
> >                 sed -i s/-static//
> > ${B}/openjdk/jdk/make/java/nio/Makefile
> >         fi
> > }
> > 
> > Regards,
> > 
> > Henry Bruce
> > 
> > --
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