urbit/nix/nixcrpkgs/linux/README.md
benjamin-tlon edd57d380d
Finish cc-release cross-compilation. (#1202)
- Fixes the IPC bug
- Fixes the terminfo bug
- Moves the OSX SDK out of our nixcrpkgs fork.
- Vendor nixcrpkgs instead of having it be a submodule.
2019-04-23 19:50:38 -07:00

15 lines
885 B
Markdown

## Linux GCC toolchain
The files in this directory define how we build our GCC cross-compiler that
targets Linux, using the musl libc.
### A note about `-rdynamic`
Do not pass `-rdynamic` to GCC when building an executable; it will cause the compiled executable to depend on a musl libc dynamic loader in `/lib` that probably doesn't exist, and defeats the point of static linking. The `-static` option overrides `-rdynamic`, so adding`-static` to the linker flags of a project using `-rdynamic` is one way to fix the issue.
CMake will pass `-rdynamic` unless you set [CMP0065](https://cmake.org/cmake/help/v3.8/policy/CMP0065.html) to new as shown below, or set your [CMake policy version](https://cmake.org/cmake/help/v3.8/command/cmake_policy.html) to 3.4 or later.
# Don't use -rdynamic since it causes Musl static linking to not work.
cmake_policy(SET CMP0065 NEW)