I'm trying to build a project with the Intel OneAPI 2024.2.1 compiler. My 32-bit release build has the issue of multiply defined symbols. There's a few math functions that are causing problems:
lld-link: error: duplicate symbol: __CIcos
>>> defined at libmmt.lib(cos_iface_c99.obj)
>>> defined at libucrt.lib(cos_impl.obj)
lld-link: error: duplicate symbol: __CIexp
>>> defined at libmmt.lib(exp_iface_c99.obj)
>>> defined at libucrt.lib(87ctran.obj)
lld-link: error: duplicate symbol: __CIlog
>>> defined at libmmt.lib(log_iface_c99.obj)
>>> defined at libucrt.lib(log_impl.obj)
lld-link: error: duplicate symbol: __CIpow
>>> defined at libmmt.lib(pow_iface_c99.obj)
>>> defined at libucrt.lib(pow_impl.obj)
lld-link: error: duplicate symbol: __CIsin
>>> defined at libmmt.lib(sin_iface_c99.obj)
>>> defined at libucrt.lib(sin_impl.obj)
lld-link: error: duplicate symbol: __CItan
>>> defined at libmmt.lib(tan_iface_c99.obj)
>>> defined at libucrt.lib(tan_impl.obj)
The big problem is, when I exclude either of these libraries (using /nodefaultlib) I get a bunch of missing implementations.
I read something somewhere about stripping some objects out of libucrt, but that's the very last thing I want to be doing. And I can't imagine that's really necessary: there's no way I'm the very first person to try and build a 32 bit release build.
What am I missing here?
Bit more context: I'm trying to use CMakeLists to stitch together multiple libraries. I'm setting /MT (and replacing /MD) on everything I've made myself, but there's a lot I'm pulling from git repos. However, I'm not getting any warnings about static/dynamic linking mismatch. So I'm assuming the linker errors I'm getting now aren't due to "mixing runtimes" (correct me if I'm wrong, my knowledge on this is very basic).
In the end, the solution turned out to be very counterintuitive:
I had to use /nodefaultlib on libucrt.lib, and then link libucrt.lib
The specific line in my CMakeLists (for the Intel compiler, which uses /Qoption,link, as a prefix for the linker option) was as follows:
target_link_options(MyTarget PUBLIC /Qoption,link,/NODEFAULTLIB:libucrt.lib libucrt.lib)