Compiler command line customization in the Rust makefile #29554
Description
Distros often have a standard, custom, set of flags that should be passed to all compiler invocations when building the binaries distributed as packages for that platform (think things like hardening options). For example, Debian wants to pass -Wl,-z,relro during the link step.
To support this, every compiler invocation in the makefile needs to include the appropriate CFLAGS, CXXFLAGS, LDFLAGS, or RUSTFLAGS variable. See the [Debian patch for guidance][debian-make].
re https://internals.rust-lang.org/t/perfecting-rust-packaging-the-plan/2767