Produce relocatable code for Rust libraries

Also update to Rust 1.75 toolchain

Author: tschneidereit

build-engine.sh

@@ -29,6 +29,11 @@ ac_add_options --enable-portable-baseline-interp
 ac_add_options --prefix=${working_dir}/${objdir}/dist
 mk_add_options MOZ_OBJDIR=${working_dir}/${objdir}
 mk_add_options AUTOCLOBBER=1
+export RUSTFLAGS="-C relocation-model=pic"
+export RUSTC_BOOTSTRAP=1
+export CFLAGS="-fPIC"
+export CXXFLAGS="-fPIC"
+
 EOF
 
 target="$(uname)"

rust-toolchain.toml

@@ -1,4 +1,4 @@
 [toolchain]
-channel = "1.68.2"
+channel = "1.75"
 targets = [ "wasm32-wasi" ]
 profile = "minimal"