You need to use gcc-ar wrappers when creating the archive in the first place.

Thanks, Andrew

On May 26, 2014, at 3:19 AM, "Bernhard Rosenkränzer" bernhard.rosenkranzer@linaro.org wrote:

Hi, I've run into some compile errors after updating to 4.9 -- usually getting undefined references to symbols defined in helper static libraries.

It turns out this is triggered by gcc -flto now creating slim object files by default (-ffat-lto-objects "fixes" it) - but I think it is actually an ld bug that should be fixed at some point. ld (regardless of whether I use -fuse-linker-plugin, -fuse-ld=gold or -fuse-ld=bfd) doesn't seem to see LTO bytecode in object files that are inside an ar wrapper. It deals with the library just fine if I use "ar x" to extract its object files and link to them individually as opposed to the .a file.

I've attached a small test case to demonstrate ("make broken" shows the error, "make works" shows the workaround).

Is there any reason why ld should behave the way it does, or is this a bug that needs fixing?

ttyl bero <ltotest.tar.gz> _______________________________________________ linaro-toolchain mailing list linaro-toolchain@lists.linaro.org http://lists.linaro.org/mailman/listinfo/linaro-toolchain