[LLVMdev] llvm-gcc with static libraries

[Eli Friedman]

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