`/usr/bin/ld -v' says it is not running gold and I suppose fixing that would require place LLVMgold.so into /usr/lib/bfd-plugins. Is there any way to make this work without requiring root access to the machine? Also, just to confirm, is the gold plugin required even when all of the files have been compiled/built using llvm-gcc and llvm-ar? Ashay On Tue, Aug 9, 2011 at 1:33 PM, Eli Friedman <eli.friedman at gmail.com> wrote:> On Tue, Aug 9, 2011 at 11:16 AM, Ashay Rane <ashay.rane at asu.edu> wrote: > > Hello, > > While linking programs against static libraries built using llvm-ar and > > llvm-ranlib, I see an error message: > > could not read symbols: Archive has no index; run ranlib to add one > > collect2: ld returned 1 exit status > > Using either /usr/bin/nm or llvm-nm (depending on the use of --emit-llvm > > flag to llvm-gcc), one of them is able to list the symbols in the archive > > file. However, the link step fails. Two sample runs follow. Am I missing > any > > options? The source code was obtained > > from: > http://www.yolinux.com/TUTORIALS/LibraryArchives-StaticAndDynamic.html > > == Without --emit-llvm => > $ llvm-gcc -c ctest1.c ctest2.c > > $ file *.o > > ctest1.o: ELF 64-bit LSB relocatable, x86-64, version 1 (SYSV), not > stripped > > ctest2.o: ELF 64-bit LSB relocatable, x86-64, version 1 (SYSV), not > stripped > > $ llvm-ar cru libctest.a *.o > > $ ls > > ctest1.c ctest1.o ctest2.c ctest2.o libctest.a prog.c > > $ llvm-ar t libctest.a > > ctest1.o > > ctest2.o > > $ llvm-nm libctest.a > > $ nm libctest.a > > nm: #_LLVM_SYM_TAB_: File format not recognized > > ctest1.o: > > 0000000000000000 T ctest1 > > ctest2.o: > > 0000000000000000 T ctest2 > > $ llvm-ranlib libctest.a > > $ llvm-gcc prog.c libctest.a -o p > > libctest.a: could not read symbols: Archive has no index; run ranlib to > add > > one > > collect2: ld returned 1 exit status > > http://llvm.org/docs/GoldPlugin.html . (I'm not completely sure > that's up-to-date, but should point you in the right direction.) > > -Eli-------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20110809/d44b1dc8/attachment.html>
On Tue, Aug 9, 2011 at 12:03 PM, Ashay Rane <ashay.rane at asu.edu> wrote:> `/usr/bin/ld -v' says it is not running gold and I suppose fixing that would > require place LLVMgold.so into /usr/lib/bfd-plugins. Is there any way to > make this work without requiring root access to the machine?If you install your own version of binutils into the same prefix as llvm-gcc, it should get used instead of the one in /usr/bin/.> Also, just to confirm, is the gold plugin required even when all of the > files have been compiled/built using llvm-gcc and llvm-ar?You can try llvm-ld... it isn't a fully general linker, but it might be good enough for your purposes. -Eli
Hi,
Thanks for the pointers. I built binutils and installed them in the same
place as llvm-gcc. However, I see the following error at the link step:
$ llvm-gcc prog.c libctest.a
collect2: ld terminated with signal 6 [Aborted]
/tmp/llvm-gcc4.2-2.9-x86_64-linux/bin/../lib/gcc/x86_64-unknown-linux-gnu/4.2.1/../../../../x86_64-unknown-linux-gnu/bin/ld:
error: libctest.a: malformed archive header name at 8
terminate called after throwing an instance of 'std::length_error'
what(): basic_string::assign
I have copied over ld.gold to ld:
$ diff ld.gold ld
$
If I use -use-gold-plugin, llvm-gcc says:
llvm-gcc: -use-gold-plugin, but LLVMgold.so not found.
I created the following shell script (called it `ld') and placed it into the
same directory as llvm-gcc:
$ cat ld
#!/bin/sh
/tmp/llvm-gcc4.2-2.9-x86_64-linux/bin/ld.gold -plugin
${HOME}/apps/llvm/LLVMgold.so $*
$
But the output from llvm-gcc does not change. Any clue whats wrong?
There is no /usr/lib/bfd-plugins nor is there a lib/bfd-plugins in the
location where the new binutils was installed. Where is this file supposed
to be copied?
Ashay
On Tue, Aug 9, 2011 at 2:12 PM, Eli Friedman <eli.friedman at gmail.com>
wrote:
> On Tue, Aug 9, 2011 at 12:03 PM, Ashay Rane <ashay.rane at asu.edu>
wrote:
> > `/usr/bin/ld -v' says it is not running gold and I suppose fixing
that
> would
> > require place LLVMgold.so into /usr/lib/bfd-plugins. Is there any way
to
> > make this work without requiring root access to the machine?
>
> If you install your own version of binutils into the same prefix as
> llvm-gcc,
> it should get used instead of the one in /usr/bin/.
>
> > Also, just to confirm, is the gold plugin required even when all of
the
> > files have been compiled/built using llvm-gcc and llvm-ar?
>
> You can try llvm-ld... it isn't a fully general linker, but it might
> be good enough for your purposes.
>
> -Eli
>
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