My project provides a library that comes with two example
binaries, one in Rust and one using FFI wrappers in a cdylib
target from C. This works great and is already automated with a
makefile.
As a final step I would like to integrate the C build with Cargo
so cargo build results in the the C binary being compiled and
linked too. However, I’m having a hard time expressing this in build.rs because the script will be executed before the
crate is built.
Ideally I’d have a [[bin]] section with the proper cc and
linker lines but considering how the makefile is already in place
it would suffice to have cargo just call make -C path/to/example. Also integration with cargo test would be
desirable since the C binary is at the same time used in blackbox
testing the Rust binary but that could be delegated to the
makefile as well.
If you want to use Rust as a library, and then build C code with that (you have int main()), you can't use build.rs. You will have to use another build system that calls cargo build --release as only one of the steps of the build.
If you want to use Rust as a library, and then build C code
with that (you have int main()), you can't use build.rs. You
will have to use another build system that calls cargo build --release as only one of the steps of the build.
In fact I have both. Cargo already builds a Rust server and an
example client. Currently I am looking into whether it’s possible
to build the C example client the same way as the Rust one so I
can replace make with Cargo as the toplevel build system.
Since I posted this I came across issue
#545 so I guess
I’m out of luck for the time being.
Cargo already builds a Rust server and an