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cefi-cmake's Introduction

Hi everyone, I'm Julian (@blitz) 👋. I'm a low-level Rust and C++ developer with 10+ years of experience. I've worked on hypervisors, firmware code, operating systems including microkernels, drivers, and more. In the dark past, I also enjoyed writing Common Lisp.

I have a blog about weird x86 details (and other things that interest me). I co-host the syslog podcast about operating system topics (but it's sleeping right now). I occasionally talk at FOSDEM (1, 2).

Lately, I enjoy building systems with Nix and help with bringing UEFI Secure Boot to NixOS.

I'm happy to collaborate on anything regarding operating systems, Rust, RISC-V, ... I'm eager to learn about quality software engineering and the social side of engineering.

If you want to chat with me, ping me on:

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cefi-cmake's Issues

Need to manually override linker for UEFI build

Nix builds in linker parameters into clang that prevent using clang to link UEFI applications. You can see this when building c2cbc9f (current master):

Scanning dependencies of target cmake-cefi
[ 50%] Building C object CMakeFiles/cmake-cefi.dir/main.c.o
clang-7: warning: argument unused during compilation: '--gcc-toolchain=/nix/store/apcaggi0q3vrb4ha1b07cjxiim2li5ly-gcc-7.4.0' [-Wunused-command-line-argument]
[100%] Linking C executable cmake-cefi
clang-7: warning: argument unused during compilation: '--gcc-toolchain=/nix/store/apcaggi0q3vrb4ha1b07cjxiim2li5ly-gcc-7.4.0' [-Wunused-command-line-argument]
lld-link: warning: ignoring unknown argument: -dynamic-linker
lld-link: warning: ignoring unknown argument: -rpath
lld-link: warning: ignoring unknown argument: -rpath
lld-link: error: /nix/store/c745s6cnnxy6c98bvhi0qsijrh3ikag1-glibc-2.27/lib/ld-linux-x86-64.so.2: unknown file type
lld-link: error: could not open /nix/store/6ck7dzvabkvhd8kd4iwlq622fknl08xy-cefi-cmake-1.0.0/lib64: No such file or directory
lld-link: error: could not open /nix/store/6ck7dzvabkvhd8kd4iwlq622fknl08xy-cefi-cmake-1.0.0/lib: No such file or directory
lld-link: error: could not open libcmt.lib: No such file or directory
clang-7: error: linker command failed with exit code 1 (use -v to see invocation)
make[2]: *** [CMakeFiles/cmake-cefi.dir/build.make:84: cmake-cefi] Error 1

The current workaround is to convince cmake to link with lld-link directly (see one commit before).

It would be nice to be able to inject the required cmake magic with a toolchain file. Even nicer would be to build this with Nix's built-in cross compilation support (mingw toolchain), but the linker is also very persistent in adding harmful flags there as well.

@tfc

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