How to query a toolchain for flag sets resulting from a supported feature?

[nicholasjng]

I am currently porting a CMake project over to Bazel, and it's going quite well. The project has quite a few different configuration options, which I've been mostly implementing with config settings and flags.

For the project, I set up a GitHub Actions job capturing the compile / link commands for all major platforms in an example project on both Bazel and CMake, and have found a few differences which I now want to equalize, or at least understand what they mean.

TLDR: I'm building a cc_binary in linkshared mode, which is packaged into a Python wheel. Most notably, with the CMake implementation on Linux, the resulting shared library is linked against a static library libnanobind.a, while in Bazel, a lot of xxx.pic.o targets are built and stitched together by the linker in the end, I'm assuming because of the pic feature.

Is there a quick way of querying the current cc toolchain for features and their resulting flag sets in a build? (And maybe more specifically, is this PIC linkage the same as linking a static lib whose targets are built with -fPIC?)