Questions about RedHat/Fedora - ld dynamic linker hash style
aph at redhat.com
Wed Jan 28 12:34:28 PST 2009
Kelly O'Hair wrote:
> I need some advice or information, figured this alias might be the
> right place to ask, probably lots of gcc/ld experts listing in here. ;^)
> Fedora (RedHat?) seems to have a different default dynamic linker hash
> I think basically it is:
> ld --hash-style=gnu ..
> So without using one of:
> --hash-style=both or --hash-style=sysv
> The bits created won't run on systems that don't support this new hash
> style, like SuSE 10.
> We had planned on changing our formal JDK7 builds to Fedora 9 but
> ran into this problem, making our built bits less portable than we
> would like. We need to resolve this, or change our build system
> I'd like to just add one of the options to the link lines in the
> OpenJDK Makefiles, but I suspect I need to be careful to only add
> the option when the Linux system doing the build needs it.
> Anybody have any ideas on how to deal with this?
> I suppose if we had a './configure' step it could be figured out
> there, but alas, we don't.
> Or, can you configure gcc/ld on a system to have a different default
> hash style?
You can do that.
$ gcc -dumpspecs > specfile
$ sed -i 's/hash-style=gnu/hash-style=both/' specfile
$ gcc -specs=specfile hello.c
This will work regardless of whether the gcc you have defaults to
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